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"Pada pertambangan minyak bumi, minyak mentah yang dihasilkan masih bercampur dengan garam-garam anorganik dan gas yang bersifat asam. Campuran material tersebut jika bercampur dengan air akan menjadi media yang sangat korosif terhadap pipa baja karbon. Oleh karena itu dibutuhkan penanggulangan untuk meminimalisir terjadinya korosi, yaitu dengan menggunakan inhibitor organik yang tersedia di alam yang lebih ramah lingkungan. Dalam penelitian ini digunakan ekstrak bawang putih (Allium sativum L.) sebagai alternatif inhibitor terhadap korosi baja karbon API-5L dalam media NaCl 1% dengan penambahan buffer asetat pH 4 jenuh CO2. Metode yang digunakan untuk menguji aktifitas inhibisi ekstrak bawang putih adalah EIS (Electrochemical Impedance Spectroscopy) dan polarisasi Tafel. Berdasarkan hasil skrining fitokimia, bawang putih mengandung sejumlah senyawa organik seperti alkaloid dan flavonoid serta senyawa aromatik lain yang mengandung molekul nitrogen, oksigen, asam amino, sulfur, atau ikatan rangkap yang memungkinkan menjadikan bawang putih sebagai alternatif inhibitor. Dari hasil pengukuran diketahui bahwa efisiensi inhibisi maksimum terjadi pada konsentrasi inhibitor maksimum, 250 ppm, dengan %EI mencapai 91,87% pada suhu kamar. Pada suhu lebih tinggi 55 oC, efisiensi inhibisi juga meningkat hingga 97,81%, pada konsentrasi ektrak bawang putih yang sama yakni 250 ppm. Laju korosi tanpa inhibitor berkisar pada rentang 1,447-9,105 mm/y, sedangkan laju korosi dengan adanya inhibitor berkisar pada rentang 0,433-0,489 mm/y. Interaksi antara permukaan logam dengan molekul inhibitor adalah fisiosorpsi dengan nilai ΔGads sebesar -18,818 kJ/mol mengikuti isotherm Freundlich. Dengan demikian dapat disimpulkan bahwa ekstrak bawang putih dapat digunakan sebagai alternatif inhibitor korosi."

"[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.]"

"Kebutuhan akan inhibitor korosi ramah lingkungan semakin berkembang, sehingga penelitian untuk mencari alternatif ekstrak tumbuhan sebagai inhibitor korosi semakin meningkat. Kayu secang dipercaya memiliki kandungan antioksidan yang dapat berperan dalam menghambat laju korosi yang pada material. Penelitian ini dilakukan untuk melihat efek penambahan ekstrak Kayu Secang (KS) terhadap laju korosi dari Baja API 5L X52 dalam Larutan 3,5% NaCl dan juga melihat sifat sinergis inhibitor saat ekstrak KS dikombinasikan dengan ekstrak Kubis Merah (KM) yang sebelumnya telah dilaporkan efektif sebagai inhibitor korosi.Beberapa pengujian dilakukan untuk mengevaluasi KS sebagai inhibitor korosi. Metode Polarisasi dan EIS digunakan untuk melihat efektifitas ekstrak KS dan kombinasinya dengan ekstrak KM sebagai inhibitor korosi dengan variasi konsentrasi yang ditambahkan. FTIR digunakan untuk mengkarakterisasi gugus fungsi yang terkandung dalam ekstrak KS dan KM. Model adsorpsi isotherm digunakan untuk melihat mekanisme adsorpsi dari ekstrak.Dari hasil Polarisasi menunjukan penambahan ekstrak KS akan menurunkan laju korosi dari 0,172 mm/tahun menjadi 0,04 mm/tahun hingga konsentrasi 0,75 ml dalam 200 ml 3,5% NaCl, dan pengujian EIS mendukung hasil tersebut. Pengabungan ekstrak KS dengan KM menunjukan efek anti-sinergi melihat dari nilai sinergistik parameter yang didapat <1. Peningkatan efisiensi inhibisi pada komposisi 0,1 ml dan 0,2 ml KS dalam 2,5 ml KM, diperkirakan karena ekstrak yang ditambahkan belum mencapai titik optimum.Hasil FTIR menunjukan ekstrak KS memiliki gugus C=O yang berperan dalam proses adsorpsi dan gugus ?OH (hydroxil) yang menunjukan sifat antioksidan. Ekstrak KS dan juga campurannya teradsorpsi mengikuti model Langmuir isotherm dimana adsorpsi yang terjadi adalah monolayer dan tidak ada reaksi antar molekul. Nilai energi bebas menunjukan bahwa proses adsorpsi terjadi secara spontan dan jenis ikatan yang terjadi dalam proses adsorpsi adalah secara fisik/physicsorption dengan nilai -20,79 KJ/mol untuk ekstrak KS, dan -7,08 KJ/mol untuk Ekstrak KS+KM

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The needs of green corrosion inhibitors is growing, thus searching for the alternative plants extract to be used as corrosion inbitor is increasing. Caesalpinia sappan L (KS) believed to contain antioxidant that may play role in inhibiting the corrosion rate of material. This study was conducted to understand the inhibitive properties owned by the extract of KS on the API 5L X52 Material in 3.5%NaCl and to assess the sinergistic effect when KS is combined with Red Cabbage (KM) extract which already proven as alternative corrosion inhibitor.

Several tests were conducted to evaluate KS as green corrosion inhibitor. Tafel Polarization and EIS methods were used to assess the effectiveness of KS and its combination with KM as corrosion inhibitor at various concentration in 3.5% NaCl. FTIR method was used to characterize the functional groups contained in the extract. Adsorption isotherm was used to recognize the adsorption mechanism of the extracts.

The polarization results shows the inhibitive properties of KS thus reduce the corrosion rate of material from 0.172mm/year to 0.04mm/year with addition of 0.75ml of KS in 200ml 3.5%NaCl, meanwhile EIS result supports the polarization results. Mixing of KS and KM shows anti-synergistic effect, which shown on synergistic parameter value <1 for any volume addition of KS. An increase in inhibition efficiency on 0.1ml and 0.2ml KS composition of the mixture is expected due the mixture has not reached the critical point.

While FTIR results show KS and KM both has a C = O functional groups that play a role in the adsorption process and the -OH (hydroxil) which shows antioxidant properties. From the verification plot of several isotherm models, the KS extract and its mixture follows Langmuir Isotherm, which mean the inhibitive layer adsorbed is considered monolayer and there is no reaction between the active molecules. Thus from the calculation of adsorption free energy we have -20.79KJ/mol for KS and - 7.08KJ/mol, thereof the adsorption process considered as physicsorption and the adsorption occurs due to electrostatic bond. The minus (-) sign indicates the adsorption process is spontaneous."

"Ekstrak areca flower telah diteliti sebagai inhibitor korosi pada baja API 5L Gr. B pada lingkungan 1 M HCl dengan menggunakan pengujian Linear Polarisasi dan Electrochemical Impedance Spectroscopy EIS. Penambahan konsentrasi inhibitor 4 ml, 8 ml, 12 ml, 16 ml, dan 20 ml dapat meningkatkan efisiensi inhibitor. Efisiensi inhibitor optimum terjadi pada saat penambahan konsentrasi inhibitor 20 ml sebesar 96.6 pada pengujian Electrochemical Impedance Spectroscopy EIS. Senyawa polifenol dan flavonoid yang terkandung dalam areca flower dapat menginhibisi korosi secara adsorpsi fisika yang membentuk lapisan monolayer yang dapat menghambat terjadinya korosi. Adsorpsi terjadi secara spontan sesuai dengan adsorpsi isotermal Langmuir. Sesuai hasil pengujian polarisasi menunjukkan ekstrak areca flower memiliki tipe inhibisi campuran mixed-type . Nilai energi bebas adsorpsi -7.026 kJ/mol menunjukkan bahwa adsorpsi molekul inhibitor adalah adsorpsi fisika.

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Areca flower has been investigated as green corrosion inhibitor on API 5L Gr B in solution 1 M HCl acidic using Linear polarization and Electrochemical Impedance Spectroscopy EIS . Addition of 4 ml, 8 ml, 12 ml, 16 ml, and 20 ml inhibitor corrosion increase efficiency of the inhibitor. Optimum inhibition efficiency occurs at addition at concentration 20 ml is 96.6 on Electrochemical Impedance Spectroscopy EIS testing. Polyphenolic and flavanoid compounds contained in the areca flower inhibit corrosion by physical adsorption, to form a monolayer which can inhibit corrosion. Adsorption occurs spontaneously in accordance with Langmuir isothermal adsorption. The polarization showed that the areca flower extract acts through mixed ndash type inhibition. The value of the free energy 7.026 kJ mol of adsorption indicated that the adsorption of inhibitor molecules was typical of physical adsorption."

"Tesis ini mempelajari mengenai pengaruh injeksi ekstrak Andaliman dan Alpha-Tocopherol sebagai green corrosion inhibitor pada baja API 5L dalam larutan HCl 1M. Dengan pengujian weight loss diperlihatkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol mampu menurunkan laju korosi dengan efisiensi 92.07 pada konsentrasi inhibitor 2 ml Andaliman 0.5 ml Alpha-Tocopherol. Dari pengujian polarisasi ditunjukkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol menggeser kurva polarisasi kearah atodik dan katodik mixed type inhibitor , yang menunjukkan ciri utama sebagai inhibitor dari bahan organik. Pengujian dengan FTIR dan GCMS memperkuat dugaan bahwa inhibitor ekstrak Andaliman dan Alpha-Tocopherol sebagai inhibitor adsorpsi/film forming.

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This thesis is intended to study the influences of Andaliman extract and Alpha- Tocopherol injection as green corrosion inhibitor for API 5L steel in HCl 1M solution. By weight loss analysis, it show that mixed inhibitor from andaliman extract and Alpha-Tocopherol can reduce corrosion rate with efficiency up to 92.07 % under inhibitor injection about 2 ml Andaliman + 0.5 ml Alpha- Tocopherol. By polarization, it is shown that inhibitor shift polarisation curves for both of anodic and cathodic polarisation (mixed type inhibitor), shows that inhibitor have characteristic as inhibitor from organic material. By FTIR and GCMS analysis can be concluded that inhibitor from Andaliman and A- Tocopherol act inhibition by adsorption/film forming corrosion inhibitor."

"Penggunaan sumber Panas bumi melibatkan pendinginan pada fluida Panas bumi dengan cara mengekstrak panasnya. Pada kasus fluida Panas bumi suhu tinggi, pengendapan amorphous silika dari larutan membentuk kerak silika adalah masalah utama dalam efisiensi ekstraksi panas. Pengurangan atau bahkan penghilangan pembentukan kerak silika dengan penanganan yang tepat pada air dapat membuka kesempatan meningkatkan efisiensi dalam penggunaan sumber Panas bumi suhu tinggi.Tujuan penelitian ini adalah untuk mengetahui kemungkinan pembentukan kerak silika dari contoh air Panas bumi lapangan panas bumi Lahendong, Sulawesi Utara dan cara-cara pencegahannya dengan menggunakan pengaturan pH dan scale inhibitor. Untuk mengetahui kemungkinan terbentuknya pengkerakan silika maka dilkakukan sejumlah perlakuan dengan volume larutan 300 ml dengan memvariasikan pH sampel kontrol 3,4,5,6,7,8,9,10,11, dan 12. Kemudian sampel ditambahkan NaCl hingga konsentrasi NaCl menjadi berturut-turut 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000 ppm. Dilakukan juga inhibisi pengkerakan dengan menggunakan asam borat dan memvariasikan penambahan asam borat berdasarkan variasi berat, yaitu: 1, 5, 10, 20, 50 miligram. Semua perlakuan, baik variasi pH maupun penambahan NaCl dan uji inhibisi dengan asam borat, diakhiri dengan menjenuhkan larutan dengan pemanasan hingga volumenya kira-kira 100 ml.Dari percobaan yang dilakukan ternyata diketahui bahwa pengkerakan paling besar terjadi pada pH 7 dang kandugngan NaCl 10000 ppm. Sedangkan untuk uji inhibisi yang paling efektif pada penambahan berat asam borat sebanyak 50 mg dengan volume sampel 300 ml. Kata Kunci: Pengkerakan silika, Scaling, scale inhibitor."

"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."