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"Korosi merupakan salah satu permasalahan penting yang harus dihadapi oleh berbagai macam sektor industri di Indonesia. Korosi memberikan efek dari segi ekonomi maupun dari segi keselamatan kerja. Salah satu cara pencegahan dan pengendalian korosi adalah dengan penambahan inhibitor.Umumnya inhibitor korosi berasal dari senyawa-senyawa organik dan anorganik yang mengandung gugus-gugus yang memiliki pasangan elektron bebas. Namun demikian, pada kenyataannya bahwa bahan kimia sintesis ini merupakan bahan kimia yang berbahaya, harganya lumayan mahal, dan tidak ramah lingkungan. Untuk itu penggunaan inhibitor yang aman, mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan sangatlah diperlukan.Penelitian ini bertujuan untuk mengetahui pengaruh beras ketan hitam sebagai inhibitor organik pada lingkungan NaCl 3,5% dan mengetahui efisiensi beras ketan hitam terhadap waktu pengujian. Pengujian laju korosi menggunakan metode kehilangan berat dimana sampel baja SPCC direndam dalam air tanah selama 3, 5, dan 7 hari.Dalam penelitian ini dapat disimpulkan beras ketan hitam bekerja baik dilingkungan air tanah karena terjadi penurunan laju korosi antara perendaman dengan inhibitor dan perendaman tanpa inhibitor terhadap lamanya waktu pengujian. Penurunan laju korosi terbesar pada hari ke-7, yaitu sebesar 34,4587%.

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Corrosion is one important problem that must be faced by a variety of industrial sectors in Indonesia. Corrosion effect from the economic and safety terms. One way of prevention and control is by adding corrosion inhibitors. Corrosion inhibitors are generally derived from compounds containing organic and inorganic cluster-cluster which has a lone pair of electrons. However, the fact that these synthetic chemicals are hazardous chemicals, the price is quite expensive and not environmentally friendly. Therefore the use of inhibitors that are safe, easily available, biodegradable, low cost, and environmentally friendly is essential.

This study aimed to investigate the influence of black glutinous rice as the organic inhibitors in 3.5% NaCl environment and knowing the efficiency of black glutinous rice with respect to time of testing. Tests for the corrosion rate using weight loss method in which SPCC steel samples immersed in ground water for 3, 5, and 7 days.

In this study we can conclude the black sticky rice works well within the ground water due to the decrease in corrosion rate between immersion with inhibitor and without inhibitor to the duration of immersion test of time. Largest decrease in corrosion rate on day 7th, that is equal to 34.4587%."

"Korosi merupakan kegagalan yang sering terjadi pada industri minyak dan gas bumi Menghambat terjadinya korosi dengan mengisolir logam dari lingkungan terkorosi pada industri minyak dan gas bumi merupakan salah satu cara efektif untuk menghindari terjadi kegagalan korosi. Penggunaan inhibitor alami menjadi pihan utama belakang ini karena aman murah dan yang terpenting bahan tersebut biodegradable dan tidak berbahaya bagi lingkungan. Penelitian ini dilakukan untuk melihat efek dari penambahan teh rosella merah terhadap inhibitor ubi ungu yang memang dapat digunakan menjadi inhibitor pada baja API 5L pada lingkungan NaCl 3 5. Pengujian ini dilakukan dengan menggunakan metode kehilangan berat dan polarisasi untuk melihat laju korosi yang terjadi pada logam lalu dilengkapi dengan data tambahan yaitu pengujian Electrochemical Impedance Spectroscopy untuk melihat tahan permukaan yang berbubah pada penelitian tersebut. Pengujian Fourier Transform Infra Red juga dilakukan untuk melihat kandungan yang menginhibisi dari ubi ungu ataupun campuran ubi ungu dan teh rosella merah Pemilihan teh rosella merah dan ubi ungu berdasarkan kandungan antocyanin dan asam askorbat yang dimiliki kedua bahan tersebut Kandungan tersebut bersifat anti oksidan yang berarti dapat menghambat terjadi proses oksidasi yang berarti juga dapat mencegah korosi. Kandungan anti oksidan tersebut bekerja dengan cara adsoprsi pada permukaan logam membentuk lapisan tipis untuk mencegah kontak antara permukaan logam dengan lingkungan korosif. Salah satu faktor pembentukan lapisan tipis pada permukaan adalah konsentrasi kandungan tersebut sehingga pengaruh konsentrasi dijadikan acuan pada penelitian ini. Penelitian ini akan dibandingkan dengan inhibitor ubi ungu yang hanya dicampur dengan kandungan asam askorbat saja.

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Corrosion is major cause failure in oil ad gas industry Isolate the metal from corrosion of materials is the most effective way to prevent corrosion for this industry. Nowadays the use of green corrosion inhibitor become a new alternative to achieve that goal it happen because the green inhibitor is safe cheap biodegradable and especially environmental friendly.

This study was conducted to study the effect of addition rosella red tea in purple sweet potato inhibitor which is can be use as inhibitor at API 5L in NaCl 3 5 solution. This study use weight loss and polarization method to see that effect and Electrochemical Impedance Spectroscopy test to prove alteration surface resistance when we add the inhibitor.

Fourier Transform Infra Red test also perform in this study to see which one the chemical substance in purple sweet potato and mixture rosella red tea and purple sweet potato can inhibit corrosion. Purple sweet potato and rosella red tea are selected as corrosion inhibitor in this study because they contain antocyanin and ascorbid acid. They are antioxidant compound which is can inhibit oxidation process it means they can prevent corrosion process. That substance inhibit metal by forming layer and isolate metal surface On the important factor to forming thin layer is concentration of the substance so the concentration substance become variable in this study. In the end this study will compared with the addition ascorbid acid in purple sweet potato"

"Korosi berpotensi menjadi sebuah masalah yang besar pada aplikasi yang menggunakan logam, contohnya dibidang industri minyak dan gas. Proses korosi akan mengakibatkan kerugian baik secara langsung maupun tidak langsung. Kerugian langsung seperti biaya penggantian material, biaya perawatan, overdesign, dll. Kerugian tidak langsung seperti plant shutdown, lost production, kontaminasi produk, dll. Salah satu cara untuk menangani masalah korosi ini adalah dengan menggunakan inhibitor. Penelitian ini bertujuan untuk mengetahui pengaruh teh hijau sebagai inhibitor organik ramah lingkungan pada lingkungan air laut dan mengetahui efisiensi ekstrak teh hijau terhadap waktu pengujian. Untuk mencapai tujuan dari penelitian ini, maka diadakan suatu pengujian dalam skala laboratorium dengan menggunakan baja SPCC dalam lingkungan air laut, dengan menggunakan inhibitor dari ekstrak teh hijau yang mengandung zat anti oksidan polifenol dan turunannya serta zat kafein yang diasumsikan keduanya dapat menekan laju korosi. Pengujian laju korosi menggunakan metode kehilangan berat dimana sampel baja SPCC direndam dalam air laut selama 3, 5, dan 7 hari. Dalam penelitian ini dapat disimpulkan ekstrak teh bekerja baik dilingkungan air laut karena terjadi penurunan laju korosi antara perendaman dengan inhibitor dan perendaman tanpa inhibitor terhadap lamanya waktu pengujian. Penurunan laju korosi terbesar pada hari ke-3, yaitu sebesar 32%.

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Corrosion potential to become a major problem in applications that use the metal, for example in the field of oil and gas industry. Corrosion process will result in loss either directly or indirectly. Direct losses such as material replacement costs, maintenance costs, over-design, etc.. Indirect losses such as plant shutdown, lost production, product contamination, etc.. One way to handle this problem is to use a corrosion inhibitor.

This study aims to determine the effect of green tea as an environmentally friendly organic inhibitors on the environment know the efficiency of sea water and green tea extract against time pengujian. Untuk achieve the objectives of this study, then conducted a test in a laboratory scale using SPCC steel in sea water environment, by using inhibitors from green tea extract containing anti-oxidant polyphenol and caffeine derivatives and substances which are assumed that they can suppress the corrosion rate. Tests for the corrosion rate using weight loss method in which SPCC steel samples immersed in sea water for 3, 5, and 7 days.

In this research suggested tea extracts worked well in the environment of sea water due to a decline in the rate of corrosion between immersion with inhibitor and without inhibitor immersion of the test duration. The biggest decrease in corrosion rate on day 3, ie by 32%."

"Ekstrak ubi ungu dikembangkan sebagai inhibitor organik untuk mengurangi laju korosi pada baja karbon rendah di lingkungan NaCl 3,5%. Penelitian telah dilakukan dengan perbedaan waktu perendaman (3,6,9,dan 12 hari) menggunakan metode kehilangan berat. Konsentrasi inhibitor ekstrak ubi ungu yang digunakan pada semua waktu perendaman sebesar 6 ml. Ekstrak ubi ungu memiliki zat antosianin yang berfungsi sebagai antioksidan untuk menghambat laju korosi. Ekstrak ubi ungu kurang efektif sebagai inhibitor organik pada lingkungan NaCl 3,5% dengan efisiensi 37,63%-43,42% selama waktu uji 3-12 hari dengan efisiensi maksimum pada waktu perendaman 9 hari.

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Purple sweet potato extract was developed as an organic inhibitor to reduce the rate of corrosion in low carbon steel in NaCl 3.5% environment. Research has been conducted with different immersion time (3,6,9, and 12 days) using weight loss methode. Concentration of inhibitor purple sweet potato as much as 6 ml for all immersion time. Purple sweet potato extract is a substance that anthocyanins act as antioxidants to inhibit the rate of corrosion. Purple sweet potato extract is less effective as an organic inhibitor in NaCl 3.5% environment with efficiency of 37.63%-43.42% during the test period 3-12 days with maximum efficiency in 9 days."

"[ABSTRAKPenelitian pemanfaatan ekstrak tumbuh-tumbuhan sebagai inhibitor korosibelakangan ini semakin meningkat seiring dengan meningkatnya permintaanpenggunaan bahan-bahan kimia yang ramah lingkungan. Pemanfaatan ekstraktumbuh-tumbuhan sebagai inhibitor korosi menjadi penting mengingatkarakteristiknya ramah lingkungan (green inhibitor), mudah ketersediaannnya,sumberdaya yang melimpah dan dapat diperbaharui, prosedur produksi yangsederhana, dan biaya produksi yang cukup kompetitif. Dalam penelitian inidilakukan pengujian eksperimental efek sinergis jenis inhhibitor baru yaituekstrak ubi ungu (Ipomoea batatas L.) yang memiliki kandungan utamaantosianin dengan inhibitor komersial berbasis amine (aniline) dan denganinhibitor asam askorbat.Penelitian bertujuan untuk menganalisis laju kororsi dan efisiensi inhibisikorosi logam baja (API 5L) di dalam lingkungan air terproduksi menggunakaninhibitor campuran ekstrak ubi ungu dan inhibitor komersial berbasis amine(aniline). Selain itu dilakukan pula analisis laju korosi, efisiensi inhibisi,mekanisme proteksi dan model lapisan inhibisi korosi logam baja (API 5L) didalam lingkungan 3,5% NaCl menggunakan inhibitor campuran ekstrak ubi ungudan asam askorbat.Metode pengukuran laju korosi dan efisiensi inhibisi dilakukanmenggunakan elektrokimia kurva polarisasi. Mekanisme korosi diteliti denganmenggunakan metode Electrochemical Impedance Spectroscopy (EIS). Untukmenganalisis model lapisan inhibisi dilakukan dengan menggunakan metodeFourier Transform Infra Red (FTIR) spectroscopy.Hasil penelitian menunjukan bahwa pencampuran ekstrak ubi ungumemiliki kemampuan sinergis dengan inhibitor komersial berbasis amine (aniline)pada fraksi volume ekstrak ubi ungu sebesar 25% dengan menghasilkan efisiensiinhibisi sebesar 82,14%. Sebagai pembanding, pada sistem yang samapenggunaan esktrak ubi ungu saja menghasilkan efisiensi inhibisi 68,30%,sedangkan penggunaan inhibitor komersial berbasis amine (aniline) sajamenghasilkan efisiensi inhibisi 74,88%.Penambahan volume ekstrak ubi ungu dari 1 mL hingga 4 mL kedalaminhibitor asam askorbat 10-4 M meningkatkan efisiensi inhibisi korosi logam baja(API 5L) dalam larutan 3,5% NaCl dari efisiensi inhibisi sebesar 23,37% menjadi57,52%. Campuran inhibitor korosi tersebut berpengaruh terhadap kurvapolarisasi anodik maupun katodik sehingga dapat berperan sebagai mixedinhibitor. Pengujian EIS menunjukan proses korosi dikontrol oleh mekanismepasivasi yang ditunjukan oleh adanya peningkatan tahanan permukaan korosi.Pada lapisan permukaan terjadi proses adsorpsi dan pembentukan kelatorgano (flavonoid) logam dimana ekstrak ubi ungu dengan kandungan utamaantosianin berperan sebagai pembentuk metal-chelated. Pembentukan kelatekstrak ubi ungu-Fe-asam askorbat terjadi pada gugus hidroksil dan karbonil.Lokasi terjadinya ligan kelat ekstrak ubi ungu dengan kandungan utma antosianinterjadi pada ikatan 3?, 4? Dihydroxy cincin B atau 3-Hydroxy 4-Carbonyl cincin C;

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ABSTRACTResearch of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.;Research of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C., Research of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.]"

"Ekstrak kulit kentang diteliti sebagai inhibitor korosi ramah lingkungan pada baja karbon di lingkungan 3,5% NaCl menggunakan uji kehilangan berat, polarisasi, dan Fourier transform infrared spectroscopy. Pada pengujian kehilangan berat menunjukkan konsentrasi 6mL memberikan nilai efisiensi paling optimal sebesar 73,33 % dengan laju korosi paling rendah sebesar 1,59 mpy. Pada pengujian polarisasi terjadi penurunan rapat arus korosi sebesar 9.79 µA/cm2 menjadi 3.27 µA/cm2, sehingga memperkuat hasil uji kehilangan berat bahwa ekstrak kulit kentang dapat menghambat korosi baja karbon rendah pada lingkungan 3,5% NaCl. Penambahan ekstrak kulit kentang menyebabkan pergeseran potensial korosi (Ecorr) mengarah kearah anodik dengan tipe inhibisi campuran (mixed). Pengujian FTIR menunjukkan ekstrak kulit kentang teradsorpsi pada permukaan baja karbon rendah melalui gugus fungsi yang dimiliki ekstrak. Mekanisme adsorpsi ekstrak kulit kentang mengikuti Langmuir adsorption isotherm yang mengindikasikan terbentuknya lapisan monolayer pada permukaan baja karbon rendah.

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Potato peel extract as green corrosion inhibitor on low carbon steel in 3.5% NaCl environment has been investigated using weight loss, polarization, and fourier transform infrared spectroscopy. The result of weight loss that showed that optimum inhibition is 73,33% in 6 mL concentration with corrosion rate 1,59 mpy and 9 days of immersion time.

Polarization show that decrease in current density 9.79 to 3.27 µA/cm2, with the result that confirm the results of weight loss that potato peel extract inhibit corrosion low carbon steel on 3.5% NaCl environment. Additional of potato peel extract showed displacement of potential corrosion to anodic direction, and act as mixed type inhibition.

FTIR showed that potato peel extract adsorbed to surface of low carbon steel through functional group extract. The mechanism of adsorption followed the Langmuir isothermal adsorption which indicated formation of monolayer film on low carbon steel surface."

"Permasalahan tentang korosi pada industri kini sudah sangat bervariasi. Maka dibutuhkan pula perlindungan yang tepat untuk tiap aplikasi yang membutuhkan. Dari berbagai macam perlindungan korosi, inhibitor salah satunya. Inhibitor merupakan suatu substansi yang ditambahkan kedalam lingkungan korosif dalam jumlah yang relatif kecil yang dapat menurunkan laju korosi (corrosion rate). Penggunaan inhibitor sebagai salah satu cara perlindungan korosi telah banyak digunakan pada dunia industri terutama pada industri pengolahan minyak, gas dan petrokimia. Inhibitor terdiri dari berbagai jenis yang dalam penggunaanya harus disesuaikan dengan kondisi lingkungan serta material yang hendak di proteksi.Penelitian ini tentang mengetahui kinerja variasi dua inhibitor, yaitu nitrit dan polyphosphate, pada lingkungan 3,5 % NaCl (air laut) dengan material yang dilindungi ialah baja karbon karena aplikasinya sering digunakan pada industri. Penelitian ini dilakukan dalam skala laboratorium. Dengan metode kehilangan berat (weight loss) penelitian dilakukan berdasarkan standar pengujian pada ASTM G 1 - 03 dan ASTM G 31 - 72. Variasi kedua inhibitor NaNO2 dan NaPO4 yang ditambahkan pada lingkungan berturut-turut 0,5% + 10 ppm; 1 % + 10 ppm; 2 % + 10 ppm; 5 % + 10 ppm dan 0,5 % + 10 ppm; 0,5 % + 20 ppm; 0,5 % + 50 ppm. Pengukuran kehilangan berat dilakukan setiap 1, 3, 5, dan 7 hari.Hasil pengujian ini pada penambahan kedua inhibitor ini akan menurunkan laju korosi. Pada variasi inhibitor polyphosphate, meskipun laju korosi turun, hasilnya masih lebih kecil daripada variasi inhibitor nitrit. Efisiensi variasi inhibitor polyphosphate 40-46%, dengan penambahan hingga 50 ppm efisiensi naik hingga 86%. Sedangan efisiensi variasi inhibitor nitrit sekitar 84-95%, dengan hasil optimal didapat dari penambahan 2% nitrit efisiensi menjadi 95 %.

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Now a days corrosion takes much problem in industries. So we need to prevent it in the aplication that takes corrosion. From all types of corrosion protection methode, inhibitor is one of widely used in petrochemical industries. Inhibitor is a small amount of substance which added to corrosive environment which can decreasing the corrosion rate. There are many types of inhibitors, which on the application must be adjust with the environment condition and also the material that we want to protect.

Purpose of this research to know the performance of two types of inhibitor, which is nitrite and polyphosphate, to protect low carbon steel in 3.5 % NaCl environment (sea water) which is the application is widely used on industries. This research was conducted in a laboratory scale. By using weight loss methode this research based on ASTM G 1 - 03 and ASTM G 31 - 72. Variable of both inhibitor (NaNO2 and NaPO4) which added continously 0,5% + 10 ppm; 1 % + 10 ppm; 2 % + 10 ppm; 5 % + 10 ppm and 0,5 % + 10 ppm; 0,5 % + 20 ppm; 0,5 % + 50 ppm. Weight loss measurement was conduct every 1, 3, 5, and 7 days.

The result from addition of both inhibitor will decreasing the corrosion rate. By variabling the polyphosphate inhibitor, even though the corrosion rate decrease, the result still smaller than nitrit inhibitor. Efficience value of polyphosphate inhibitor variable vary from 40-46%, by adding till 50 ppm the efficience will increase until 86%. However, the efficience value nitrite inhibitor variable vary from 84-95%, with the highest value was reach by adding 2% nitrite + 10 ppm polyphosphate."

"ABSTRAKPenelitian ini dilakukan untuk menganalisa pengaruh inhibisi ekstrak cair daunBeluntas (Pluchea Indica Less.) terhadap korosi pada baja karbon rendah dilingkungan 3,5% NaCl. Penelitian dilakukan menggunakan pengujian weight loss,polarisasi, dan Fourier transform infrared spectroscopy (FTIR). Pengujian weightloss menunjukkan bahwa perendaman selama 9 hari dengan penambahan ekstraksebanyak 3 mL memberikan nilai rata-rata efisiensi paling maksimum sebesar75,97% dengan rata-rata laju korosi paling minimum sebesar 0,89 mpy. Pengujianpolarisasi menunjukkan terjadi pergeseran kurva ke arah anodik pada penambahanekstrak sebanyak 1,2,3 mL, dan bergeser ke arah katodik pada penambahansebanyak 4 mL. Penambahan ekstrak berpengaruh terhadap penurunan laju korosiyaitu dari 24,8 µA.cm-2 menjadi 5,04 µA.cm-2, sehingga memperkuat hasilpengujian weight loss bahwa ekstrak daun Beluntas dapat menghambat korosibaja karbon rendah di larutan 3,5% NaCl. Pengujian polarisasi menunjukkanbahwa ekstrak daun Beluntas memiliki tipe inhibisi campuran (mixed) dengankecenderungan lebih dominan kearah anodik berdasarkan nilai potensial korosiyang berubah secara acak. Pengujian FTIR menunjukkan bahwa estrak daunBeluntas teradsorpsi pada permukaan baja karbon rendah dan proses adsorpsinyaterjadi melalui gugus fungsi yang dimiliki ekstrak. Mekanisme adsorpsi ekstrakdaun Beluntas sesuai dengan Langmuir adsorption isotherm yang menunjukkanbahwa telah terjadi pembentukan lapisan monolayer di permukaan baja karbonrendah.

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ABSTRACTThe study was conducted to analyze the inhibition effect of Beluntas (Plucheaindica Less.) leaves extract on the corrosion of low carbon steel in 3.5% NaClenvironment. The study was invetigated by weight loss, polarization, and Fouriertransform infrared spectroscopy (FTIR) methods. Weight loss showed that soakingfor 9 days with the addition of 3 mL of the extract gave an average value of themaximum efficiency of 75.97% with an average of the minimum corrosion rate of0.89 mpy. Polarization shows the polarization curve shifts to the anodic directionin addition of 1,2,3 mL extract, and shifted toward the cathodic curve to theaddition of 4 mL. The presence of inhibitor causes decrease in the corrosion ratefrom 24.8 to 5.04 μA.cm-2, thus confirm the results of weight loss that Beluntasleaves extract can inhibit the corrosion of low carbon steel in 3.5% NaCl solution .The polarization showed that the Beluntas leaves extract acts through mixed modeof inhibition, as evident from the values of Ecorr, which do not increase or decreasein a regular manner from the blank value. FTIR showed that the Beluntas leavesextract adsorbed on the surface of low carbon steel and the process of adsorptionoccurs through a functional group extract. Beluntas leaves extract showsLangmuir adsorptions isotherm that indicated the monolayer formation on the lowcarbon steel surface."

"Korosi merupakan penyebab utama kegagalan dalam industri minyak dan gas bumi. Mengisolir logam dari bahan korosi merupakan adalah cara yang paling efektif untuk mencegah korosi pada industri ini. Penggunaan inhibitor korosi alami menjadi alternatif baru untuk mencapai tujuan tersebut. Bahan alam dipilih sebagai alternatif karena bersifat aman, mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan.Penelitian ini dilakukan untuk mempelajari perilaku inhibisi ekstrak kulit manggis pada pipa baja API-5L di lingkungan air terproduksi dan dibandingkan dengan inhibitor kimia dengan menggunakan metode kehilangan berat. Parameter elektrokimia dievaluasi dengan menggunakan metode EIS dan metode FTIR dilakukan untuk mengidentifikasi gugus aktif yang bekerja. Ekstrak kulit manggis dipilih sebagai inhibitor korosi karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Hasil penelitian menunjukkan ekstrak kulit manggis dan inhibitor kimia merupakan inhibitor korosi yang sangat efektif untuk pipa baja API-5L di lingkungan air terproduksi karena dapat menurunkan laju korosi secara signifikan. Efisiensi inhibisi ekstrak kulit manggis sebesar 58 - 92% dengan penambahan 2 - 10 ml ekstrak kulit manggis. Ekstrak kulit manggis bekerja dengan membentuk suatu lapisan tipis (terlihat maupun tidak terlihat secara kasat mata) atau senyawa kompleks, yang mengendap (adsorpsi) pada permukaan logam sebagai lapisan pelindung yang dapat menghambat reaksi logam tersebut dengan lingkungannya. Mekanisme ini juga didukung dengan meningkatnya nilai tahanan polarisasi dari permukaan baja setelah ditambahakan inhibitor.

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Corrosion is the major cause failure in oil and gas industry. Isolate the metal from corrosion of materials is the most effective way to prevent corrosion for this industry. The use of green corrosion inhibitor become a new alternative to achieve that goal. Green inhibitor chosen as an alternative because it is safe, easily available, biodegradable, low cost, and environmentally friendly.

This study was conducted to study the inhibition behavior of pericarp of mangosteen extract for API-5L pipe steel in produced water environment and compared with chemical inhibitor using the weight loss method Electrochemical parameters are evaluated using EIS method and FTIR method to identify functional group that works. Pericarp of mangosteen extract is selected as corrosion inhibitor because they contain antioxidant compounds that can inhibit the corrosion rate.

Result showed pericarp of mangosteen extract and chemical inhibitor is highly effective corrosion inhibitor for API-5L pipe steel in produced water environment because it can inhibit the corrosion rate significantly. Inhibition efficiency for pericarp of mangosteen is 58 - 92% with addition of pericarp of mangosteen extract of 2 -10 ml. Pericarp of mangosteen works by forming a thin layer (visible or not visible by naked eye) or complex compounds, which settles (adsorption) to metal surfaces as a protective layer that can inhibit the reaction of the metal with its environment. This mechanism is also supported by the increased value of the polarization resistance of the steel surface after addition of inhibitor."

"Semua material berbahan dasar logam dapat mengalami degradasi material dan degradasi material memiliki banyak jenis, salah satunya korosi yang berbentuk sumuran. Studi pengaruh posisi penempatan coupon test terhadap pembentukkan korosi sumuran pada UNS 30400, UNS 20100, dan AISI 1015 dilakukan dengan menggunakan reaktor mekanik dalam media NaCl 3,5% teraerasi dengan posisi kupon arah jam 12, jam 9 dan jam 6 jika direpresentasikan pada jaringan pipa. Pengaruh laju aliran terhadap pembentukkan korosi sumuran telah banyak diteliti, dimana didapat bahwa korosi sumuran dapat tumbuh pada jenis aliran laminar maupun aliran turbulen. Serta memiliki kecepatan alir kritis untuk pertumbuhan korosi sumuran dengan kecepatan 1,5 m/s. Bentuk-bentuk korosi yang terjadi dianalisa dengan menggunakan mikroskop optik dan menggunakan metode pengurangan berat. Dari karakterisasi ini diperoleh bahwa posisi penempatan kupon dan laju alir mempengaruhi bentuk korosi sumuran yang terjadi, sehingga hasil dapat merepresentasikan bagian dalam pipa yang paling berbahaya jika terjadi korosi sumuran.

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Degradation occur in every metal based material, one of the degradation is pitting corrosion. Influence of coupon test position with formation of pitting corrosion at UNS 30400, UNS 20100, and AISI 1015 done by mechanics reactor in aerated 3,5% sodium chloride represented an internal pipeline position with 6 o’clock, 9 o’clock, and 12 o’clock position. There are many researchs about influence of fluid flow to pitting corrosion formation, it shows that pitting corrosion happened in every flow regime either in laminar flow or turbulent and has a critical velocity for stable pit growth is 1,5 m/s. In this research, form of pitting corosion examine by optical microscope and weight loss method. From this characterization informed that position of coupon test and fluid flow influence the pit form, so this result can represent the most severe position for pitting corrosion inside the pipe."