Hasil Pencarian  ::  Simpan CSV :: Kembali

"[ABSTRAKKorosi pada tubing baja karbon merupakan masalah serius bagi eksplorasi dan produksi minyak dan gas. Perilaku korosi baja paduan rendah 3%Cr (3Cr) dan baja karbon J55 dalam lingkungan air formasi diinvesitigasi dengan menggunakan pengujian tafel polarisasi potensiodinamik, electrochemical impedance spectroscopy (EIS) dan pengamatan metalografi. Komposisi dan morfologi dari produk korosi kedua baja dianalisa dengan energy dispersive spectroscopy (EDS) dan scanning electron microscopy (SEM). Hasil pengujian memperlihatkan adanya korosi lokal pada baja J55 dengan struktur mikro pro-eutektoit ferit dan perlit, dan tidak terlihat pada baja 3Cr dengan struktur mikro martensit temper dikarenakan terbentuknya lapisan produk korosi kaya-Cr yang padat, kontinyu dan melekat dengan baik ke permukaan baja. Lapisan produk korosi yang bercelah dan tidak kontinyu pada baja J55 menyediakan jalan bagi ion-ion agresif untuk masuk dan menimbulkan korosi lokal pada permukaan baja.ABSTRACTCorrosion of carbon steel tubings is a serious problem for oil and gas wet exploration and production. Corrosion behaviour of low bearing 3%Cr (3Cr) alloy steel and J55 carbon steel in produced water were investigated by polarisation potentiodynamic tafel, electrochemical impedance spectroscopy (EIS) and metallography observation. The composition and morphology of corrosion products were analyzed by energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The results show that there was localized corrosion was observed in J55 carbon steel with pro-eutectoid ferrite and pearlite microstructure, which did not exist in 3Cr steel with tempered martensite microstructure due to formation of a dense, continuous and adherent Cr-rich scale on surface steel. Many pits in the less adherent corrosion scale of J55 carbon steel could build up ion-diffusion channels which would degrade the protective capabilities of the product films and aggravate localized corrosion.;Corrosion of carbon steel tubings is a serious problem for oil and gas wet exploration and production. Corrosion behaviour of low bearing 3%Cr (3Cr) alloy steel and J55 carbon steel in produced water were investigated by polarisation potentiodynamic tafel, electrochemical impedance spectroscopy (EIS) and metallography observation. The composition and morphology of corrosion products were analyzed by energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The results show that there was localized corrosion was observed in J55 carbon steel with pro-eutectoid ferrite and pearlite microstructure, which did not exist in 3Cr steel with tempered martensite microstructure due to formation of a dense, continuous and adherent Cr-rich scale on surface steel. Many pits in the less adherent corrosion scale of J55 carbon steel could build up ion-diffusion channels which would degrade the protective capabilities of the product films and aggravate localized corrosion.;Corrosion of carbon steel tubings is a serious problem for oil and gas wet exploration and production. Corrosion behaviour of low bearing 3%Cr (3Cr) alloy steel and J55 carbon steel in produced water were investigated by polarisation potentiodynamic tafel, electrochemical impedance spectroscopy (EIS) and metallography observation. The composition and morphology of corrosion products were analyzed by energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The results show that there was localized corrosion was observed in J55 carbon steel with pro-eutectoid ferrite and pearlite microstructure, which did not exist in 3Cr steel with tempered martensite microstructure due to formation of a dense, continuous and adherent Cr-rich scale on surface steel. Many pits in the less adherent corrosion scale of J55 carbon steel could build up ion-diffusion channels which would degrade the protective capabilities of the product films and aggravate localized corrosion., Corrosion of carbon steel tubings is a serious problem for oil and gas wet exploration and production. Corrosion behaviour of low bearing 3%Cr (3Cr) alloy steel and J55 carbon steel in produced water were investigated by polarisation potentiodynamic tafel, electrochemical impedance spectroscopy (EIS) and metallography observation. The composition and morphology of corrosion products were analyzed by energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The results show that there was localized corrosion was observed in J55 carbon steel with pro-eutectoid ferrite and pearlite microstructure, which did not exist in 3Cr steel with tempered martensite microstructure due to formation of a dense, continuous and adherent Cr-rich scale on surface steel. Many pits in the less adherent corrosion scale of J55 carbon steel could build up ion-diffusion channels which would degrade the protective capabilities of the product films and aggravate localized corrosion.]"

"Peningkatan kebutuhan bahan penghambat korosi yang aman dan ramah lingkungan menjadi perhatian utama, terutama dalam industri berbasis baja karbon rendah. Salah satu penyebab utama kerusakan pada material ini adalah korosi yang dipercepat oleh penggunaan larutan asam seperti H2SO4. Salah satu cara untuk mengurangi laju korosi dari material adalah dengan menambahkan inhibitor organik dari ekstrak tumbuhan yang mengandung senyawa bioaktif. Pada penelitian ini, dilakukan penambahan variasi konsentrasi inhibitor dari ekstrak akar pepaya (Carica papaya L.) dengan melarutkan ke dalam larutan 1M asam sulfat (H2SO4), dimana asam sulfat merupakan senyawa yang digunakan untuk acid pickling pada baja. Dilakukan uji Optical Emission Spectroscopy (OES) untuk mengetahui komposisi kimia dari material uji sesuai dengan spesifikasi material API 5L dan uji Fourier Transform Infra Red (FTIR) untuk mengetahui senyawa yang terkandung dalam ekstrak akar pepaya yang akan digunakan sebagai inhibitor pada baja karbon rendah API 5L grade B. Dilakukan juga pengujian Linear polarisasi untuk mengetahui efisiensi laju korosi pada penambahan variasi ekstrak inhibitor akar pepaya. Kemudian, dilakukan pengujian Electrochemical impedance spectroscopy (EIS) untuk menginterpretasikan sistem variasi konsentrasi inhibitor akar pepaya pada rangkaian listrik. Hasil pengujian menunjukkan bahwa material uji sesuai dengan spesifikasi API 5L grade B, ekstrak akar pepaya mengandung senyawa bio aktif flavonoid, saponin, alkaloid, dan tanin yang terbukti menurunkan laju korosi dengan variasi konsentrasi dari 4 ml sampai 20 ml terbukti menurunkan laju korosi dari 1,172 mm/year menjadi 0,074 mm/year dengan efisiensi maksimum 93,68% pada konsentrasi 20 ml.

---

The increasing need for safe and environmentally friendly corrosion inhibiting materials is a major concern, especially in low carbon steel-based industries. One of the main causes of damage to these materials is accelerated corrosion by the use of acidic solutions such as H2SO4. One way to reduce the corrosion rate of the material is to add organic inhibitors from plant extracts containing bioactive compounds. In this study, the addition of various concentrations of inhibitors from Akar Pepaya extract (Carica papaya L.) was carried out by dissolving it in 1M sulfuric acid (H2SO4) solution, where sulfuric acid is a compound used for acid pickling on steel. Optical Emission Spectroscopy (OES) test was conducted to determine the chemical composition of the test material in accordance with API 5L material specifications and Fourier Transform Infra Red (FTIR) test to determine the compounds contained in Akar Pepaya extract which will be used as an inhibitor on API 5L grade B low carbon steel. Linear polarization testing was also carried out to determine the efficiency of the corrosion rate in the addition of akar pepaya inhibitor extract variations. Then, Electrochemical impedance spectroscopy (EIS) testing was carried out to interpret the system of variations in Akar Pepaya inhibitor concentration in electrical circuits. The test results show that the test material is in accordance with API 5L grade B specifications, Akar Pepaya extract contains bioactive compounds flavonoids, saponins, alkaloids, and tannins which are proven to reduce the corrosion rate with a concentration variation from 4 ml to 20 ml which is proven to reduce the corrosion rate from 1,172 mm/year to 0,074 mm/year with a maximum efficiency of 93,68% at a concentration of 20 ml."

"Baja rendah karbon merupakan bahan konstruksi utama pada industri minyak dan gas. Namun, bahan ini bersifat sangat rentan terhadap korosi. Pada penelitian ini, telah dilakukan sintesis inhibitor korosi TETA-MGS (trietilentetramin-minyak goreng sawit) dengan metode refluks selama 14 jam. Temperatur divariasikan pada 130, 140, 150, dan 160⁰C, dan kecepatan pengadukan pada 700, 1000, dan 1200 rpm. Diperoleh kondisi reaksi optimum dari titrasi penentuan angka penyabunan, yaitu pada temperatur 150⁰C, kecepatan pengadukan 1200 rpm, dan waktu reaksi 14 jam. Produk sintesis TETA-MGS A dimurnikan, sehingga didapatkan TETA-MGS B. TETA-MGS B kemudian diidentifikasi dengan KLT, dikarakterisasi dengan spektrofotometri UV-visibel, spektroskopi FTIR dan LC-MS. Identifikasi dengan KLT menunjukkan bahwa TETA-MGS B bersifat cukup polar seperti prekursor trietilentetraminnya. TETA-MGS B memberikan serapan maksimum pada 204 nm untuk spektrum UV-visibelnya  dan memiliki gugus-gugus kromofor yang sama dengan minyak goreng sawit dan trietilentetramin. Spektrum FTIR TETA-MGS B menunjukkan adanya tumpang tindih senyawa-senyawa TETA-MGS B. Pada LC-MS, diketahui bahwa TETA-MGS B dari sintesis pada 150⁰C, 1200 rpm, dan selama 14 jam bukan senyawa imidazolin, melainkan masih berupa intermediet amidanya. Senyawa imidazolin baru diperoleh pada temperatur sintesis 160⁰C. Pengujian efisiensi inhibisi korosi dilakukan dengan metode gravimetri dan elektrokimia menggunakan TETA-MGS A dan B dari sintesis pada 150⁰C, 1200 rpm, dan selama 14 jam. Konsentrasi divariasikan pada 0, 5, 20, 50, dan 100 ppm. Pengujian dilakukan untuk baja rendah karbon JIS G3123 grade SGD 400D pada media korosi berupa larutan NaCl 1,5% yang telah dialirkan gas CO2. Efisiensi tertinggi diperoleh pada konsentrasi 100 ppm dan nilainya 62,12 dan 93,52% untuk TETA-MGS A dan B masing-masing. Hasil SEM-EDX mendukung efisiensi tinggi TETA-MGS B. Tipe korosi yang terjadi adalah korosi pitting. Adsorpsi TETA-MGS B pada permukaan baja merupakan fisisorpsi kuat dan sesuai dengan model isoterm Langmuir.

---

Low carbon steel is the main construction material in the oil and gas industry. However, this material is highly susceptible to corrosion. In this research, the synthesis of the corrosion inhibitor TETA-PCO (triethylenetetramin-palm cooking oil) was carried out using the reflux method for 14 hours. The temperature was varied at 130, 140, 150 and 160⁰C, and the stirring speed at 700, 1000 and 1200 rpm. The optimum reaction conditions were obtained from saponification value determination titration, namely at a temperature of 150⁰C, a stirring speed of 1200 rpm, and a reaction time of 14 hours. The synthesis product of  TETA-PCO A was purified to obtain TETA-PCO B. TETA-PCO B was then identified by TLC, characterized by UV-visible spectrophotometry, FTIR spectroscopy and LC-MS. Identification by TLC showed that TETA-PCO B is as polar as its precursor triethylenetetramine. TETA-PCO B provides maximum absorption at 204 nm for its UV-visible spectrum and has the same chromophore groups as palm cooking oil and triethylenetetramine. The FTIR spectrum of TETA-PCO B showed an overlapping of the TETA-PCO B compounds. In LC-MS, it was found that TETA-PCO B from synthesis at 150⁰C, 1200 rpm, and for 14 hours was not an imidazoline compound, but were still its amide intermediates. Imidazoline compounds were obtained at a synthesis temperature of 160⁰C. Corrosion inhibition efficiency testing was carried out by gravimetric and electrochemical methods using TETA-PCO A and B from synthesis at 150⁰C, 1200 rpm, and for 14 hours. Concentrations were varied at 0, 5, 20, 50, and 100 ppm. The test was carried out for low carbon steel JIS G3123 grade SGD 400D in a corrosion medium in the form of 1.5% NaCl solution which had been flowed with CO2 gas. The highest efficiencies were obtained at the concentration of 100 ppm and the values were 62.12 and 93.52% for TETA-PCO A and B respectively. SEM-EDX results support the high efficiency of  TETA-PCO B. The type of corrosion that occured was pitting corrosion. The adsorption of  TETA-PCO B on the steel surface is a strong physisorption and is in accordance with the Langmuir isotherm model."

"Material baja karbon API 5L Grade B banyak digunakan dalam industri minyak dan gas dengan sistem operasi tekanan dan suhu yang cukup tinggi. Penelitian ini dilakukan terhadap analisis korosi pipa penyalur bahan bakar di wilayah Jakarta terhadap manajemen resiko berdasarkan nilai index sum dan menganalisis perilaku korosi sampel material pipa API 5L Grade B berupa struktur mikro, pengaruh sifat mekanis, dan laju korosi pada pipa penyalur. Hasil analisa memperlihatkan bahwa pipa API 5L Grade B yang digunakan sebagai jalur distribusi bahan bakar ditemukan adanya cacat yang pada awalnya berupa korosi seragam kemudian membentuk korosi celah setelah itu membentuk korosi sumuran dan berakibat pada kemunduran bahan pipa dengan tingkat resiko pipa penyalur berada pada level medium risk.

---

Carbon steel material API 5L Grade B was used by industry of the oil and gas with the pressure operating system and with high enough temperature. This research was conducted to corrosion analysis pipelines for fuel in Jakarta on risk management based on the value of the index sum and analyze the corrosion behavior of the material sample pipe API 5L Grade B is a micro-structure, the influence of mechanical properties and corrosion rate in the conduit.

The results of the analysis showed that the pipe API 5L Grade B used as a distribution line of fuel is defects and the result is deterioration of pipe materials with the risk level of the pipeline is at the medium level of risk."

"Baja AISI 316L yang digunakan sebagai bahan dasar tabung solar water heater (SWH) termasuk kategori baja tahan karat austenitik. Baja tahan karat austenitik merupakan jenis baja tahan karat yang memiliki ketangguhan dan keuletan yang bagus disamping ketahanan terhadap korosi dan sifat mampu las yang juga bagus. Baja AISI 316 L sebelum dilakukan pengelasan telah mengalami proses deformasi dingin (cold working) sebesar 0%, 5%, dan 10 % sehingga berpengaruh terhadap ketahanan korosinya setelah dilakukan penyambungan dengan menggunakan pengelasan TIG. Logam pengisi yang digunakan adalah ER 316 L dan ER 316 Lsi. Adapun perlakuan dasar terhadap material sebelum dilas berupa solution annealing, purging dan tanpa purging serta proses passivasi dgn HNO3 pada daerah sambungannya setelah proses pengelasan. Hasil pengujian menunjukkan bahwa dengan semakin tinggi persen deformasi yang dialami material maka ketahanan korosi cenderung menurun. Hal ini dilihat dari kehilangan berat per satuan luas, dimana pada deformasi 0% sebesar 0,0529 gr/cm2 , deformasi 5% sebesar 0,0589 gr/cm2 , dan pada deformasi 10 % sebesar 0,0623 gr/cm2. Pengaruh proses solution annealing terhadap material yang terdeformasi menunjukkan kehilangan berat yang semakin kecil pada persen deformasi yang identik yakni pada deformasi 0% sebesar 0,0518 gr/cm2, deformasi 5% sebesar 0,0537 gr/cm2 dan deformasi 10% sebesar 0,0518 gr/cm2 . Sedangkan pengaruh logam pengisi ER 316LSi lebih baik ketahanan korosi-nya daripada ER 316L hal ini ditunjukkan dengan luas kurva polarisasi ER 316 LSi yang lebih kecil daripada kurva polarisasi ER 316 L. Pengaruh perlakuan proses purging dan passivasi juga mampu meningkatkan ketahanan pitting, hal ini terlihat dari kehilangan berat per satuan luas yang paling kecil, yakni sebesar 0,02448 gr/cm2.

---

AISI 316L stainless steel, that is used as material for Solar Water Heater (SWH) tube, was classified as austenitic stainless steel. Austenitic stainless steel is a kind of stainless steel with good weldability and corrosion resistance. Before the welding process, stainless steel AISI 316 L have experienced a cold deformation process to the amount of 0 %, 5 %, and 10 %. There are two types of filler wire used in the process. It was ER 316L and ER 316 LSi. Meanwhile, basic treatments used for material before welding were solution annealing, purging and non purging. The passivation process using HNO3 was applied as well after welding process. The result shows that increasing deformation level decreases the corrosion resistance of material. It was indicated from the increasing of weight loss per unit area. The weight looses as much as 0.0529 gr/cm2 at no deformation, 0.0589 gr/cm2 in deformation level 5 %, and 0.0623 gr/cm2 in deformation 10% respectively. Sollution annealing process yields decreasing the weight loss. It was in the amount of 0.0518 gr/cm2 at no deformation, 0.0537 gr/cm2 in deformation of 5%, and 0.0518 gr/cm2 in deformation 10%. The use of ER 316 LSi filler wire influenced the material to have a better corrosion resistance than the use of ER 316 L, it shown by the smaller area of cyclic polarization curve on ER 316LSi than ER 316L. In additional, the effect of purging and passivation process increase the pitting corrosion resistance of 316L weldments. It was indicated from the smallest weight loss per unit area of 0.02448 gr/cm2."

"Tujuan dari penelitian ini adalah untuk mempelajari laju korosi pada daerah-daerah las dari material baja ASTM A 106 grade B yang digunakan pada industri geothermal. Tiga daerah tersebut adalah daerah logam dasar, daerah HAZ, dan daerah logam las yang diletakkan pada empat jenis larutan elektrolit, yaitu kondensat CT 01, CT 02, CT 03, dan Down Stream dengan menggunakan tiga elektroda sel elektrokimia untuk menghitung laju korosi. Dalam penelitian ini, perhitungan Index Langelier dan Ryznar menunjukkan bahwa kondensat CT 03 merupakan larutan kondensat yang bersifat paling korosif dari keempat larutan elektrolit yang digunakan. Kurva tafel dan parameter korosi dari tiga jenis sampel memperlihatkan bahwa sampel daerah HAZ memiliki laju korosi tertinggi daripada daerah logam dasar dan daerah logam las. Laju korosi tertinggi pada penelitian ini adalah 7 mpy dimana didapatkan pada daerah HAZ di larutan kondensat CT 03. Laju korosi yang relatif tinggi pada daerah HAZ disebabkan karena kehadiran struktur bainit bawah yang terbentuk di daerah ini selama proses pengelasan dan pembekuan. Adanya pertumbuhan butir, ferrite, pearlite dan bainit bawah di daerah HAZ ditunjukkan dari foto mikro yang diambil pada daerah ini. Struktur widmanstatten ditemukan pada daerah logam las yang memberikan hasil nilai kekerasan sebesar 151 BHN, dimana merupakan nilai kekerasan tertinggi yang didapatkan pada penelitian ini. Nilai kekerasan pada daerah lain antara lain , daerah HAZ 137 BHN dan daerah logam dasar 132 BHN. Foto mikro daerah logam dasar memperlihatkan bahwa daerah ini terdiri dari ferrite dan pearlite dimana, merupakan struktur yang biasa terbentuk pada baja karbon seperti baja ASTM A 106 grade B yang digunakan pada penelitian ini.

---

The purpose of this research was to study the corrosion rate of welded ASTM A 106 grade B steel used at the geothermal industry. Three zones of this welded steel ? i.e. base metal, HAZ, and base metal were studied in four kinds of electrolytes ? i.e. condensate CT01, CT02, CT03, and Down Stream by means of a three-electrode electrochemical cell in order to measure their corrosion rates. Based on the calculation of Langelier and Ryznar Index, condensate CT03 was the most corrosive electrolyte of four ones used in this research. Tafel curves and corrosion parameters of three kinds of tested samples showed that the sample of HAZ exhibited a higher corrosion rate than the ones of the base metal and weld zone.

The highest corrosion rate in this research was 7 mpy which was obtained at HAZ in the condensate CT03. The relatively high corrosion rate of the HAZ zone might be attributable to the presence of lower bainite structure formed in this zone during welding and solidification. The presence of grain growth, ferrite, pearlite and lower bainite in the HAZ was evidenced by the micrograph taken on this zone. Widmanstatten structures found in the weld zone successfully yielded the hardness of 151 BHN, which was the highest hardness value obtained in this research. The hardness values of other zones ? i.e. HAZ and base metal zone were 137 and 132 BHN, respectively. The micrograph of base metal showed that this zone consisted of ferrite and pearlite which were the natural structures formed in the carbon steel like ASTM A 106 grade B steel used in this research."

"Penelitian efek perlakuan panas pada ketahanan korosi pitting dan struktur mikro pada lasan berulang material super duplex stainless steel UNS S32760 dievaluasi melalui uji korosi pitting, karakterisasi struktur mikro, dan analisis SEM-EDS. Spesimen yang digunakan dalam penelitian ini adalah lasan asli (OW) dan spesimen pengelasan berulang yang diberikan perlakukuan panas, yaitu lasan yang diulang sekali (HR1), lasan yang diulang dua kali (HR2), dan lasan yang diulang tiga kali (HR3).Hasil penelitian menunjukkan bahwa OW menunjukan ketidakseimbangan fraksi ferit-austenit yang signifikan yang mengurangi ketahanan korosi pitting. Perlakuan panas pada temperatur 1100 ºC secara bertahap dapat mengembalikan keseimbangan fraksi ferit-austenit dan melarutkan fasa intermetalik sehingga meningkatkan sifat ketahanan korosi pitting pada spesimen lasan berulang, HR1, HR2, dan HR3.

---

The effect of heat treatment on the pitting corrosion resistance and microstructure of UNS S32760 super duplex stainless steel`s repeated welds was investigated through a pitting corrosion test and microstructure characterization. The specimens include an original weld (OW) and three heat-treated specimens, namely a once-repeated weld (HR1), a twice-repeated weld (HR2), and a three-time-repeated weld (HR3).

The results show that the OW represents a significant imbalance of ferrite-austenite fractions reducing the pitting corrosion resistance. Conversely, 1100 ºC heat treatment on HR1, HR2, and HR3 gradually returns the equilibrium of ferrite-austenite fractions and dissolve intermetallic phase which improves the pitting corrosion resistance."

"SS 410 (CA-15) adalah salah satu jenis baja tahan karat martensitik yang banyak digunakan untuk aplikasi dalam dunia industri. Bahan baku yang digunakan pada baja tahan karat martensitik jenis ini adalah C = 0,15% .' Mn = "

"Kebutuhan akan minyak bumi mentah semakin meningkat dalam pangsa pasar nasional maupun Internasional. Berbagai upaya terus dilakukan guna meningkatkan kualitas minyak mentah, salah satunya melalui proses pendistribusian minyak mentah. Pendistribusian yang dinilai efisien yaitu dengan menggunakan pipa bawah laut ataupun bawah tanah yang terbuat dari material baja karbon. Sehingga sangat penting bagi industri minyak berfokus pada pemeliharaan alat dan konstruksi pipa terutama bahan material baja dari potensi terkena korosi. Salah satu upaya dalam mencegah korosi yaitu penambahan inhibitor korosi dengan konsentrasi kecil (ppm) ke dalam media pengkorosif guna mengendalikan korosi pada material logam. Inhibitor korosi dari senyawa bahan alam mempunyai banyak keunggulan yaitu ramah lingkungan, mudah didapatkan, dan mudah diproduksi. Pada penelitian ini dilakukan seleksi inhibitor korosi terbaik dari tiga fraksi yaitu fraksi n-heksana, fraksi etil asetat, dan fraksi metanol dari ekstrak daun alang-alang berdasarkan metode Weight Loss. Karakterisasi lapisan yang terbentuk pada permukaan baja karbon diamati dengan FT-IR, UV-Vis DRS, XRD dan bentuk morfologi permukaan plat baja karbon berdasarkan SEM EDS. Keberhasilan inhibitor korosi dalam melindungi baja karbon terlihat dari persen efisiensi inhibitor yaitu 94.89% pada konsentrasi 600 ppm suhu 30oC dalam larutan pengkorosif HCl 0.5M. Adsorpsi inhibitor korosi FH secara isoterm mengikuti isoterm adsorpsi Langmuir. Aplikasi inhibitor korosi FH dengan konentrasi 600 ppm pada suhu 60oC dengan waktu kontak 36 jam memberikan % efisiensi inhibitor di atas 90% pada larutan brine sintesis.

---

Demand for crude oil has increased in market share both national and international. There are continuous efforts to improve the quality of crude oil, one of them through the process of distribution of crude oil. The distribution is considered efficient by using underwater or underground pipelines which are made of carbon steel material. So it is very important to the oil industry focusing on equipment maintenance and pipeline construction materials, especially steel of potential for corrosion.

One effort in preventing corrosion is the addition of a corrosion inhibitor with a small concentration (ppm) to the corrosive agent media to control corrosion on metallic materials. Corrosion inhibitors from natural materials compounds have many advantages that are environmentally friendly, readily available, and easily manufactured.

In this study, corrosion inhibitor selected the best of the three fractions, there are n-hexane fraction, ethyl acetate fraction, and methanol fraction from extract of leaves reeds based of Weight Loss method. Characterization layer formed on the surface of carbon steel was observed by FT-IR, UV-Vis DRS, XRD and the morphology of the surface of carbon steel plate by SEM EDS.

The success of corrosion inhibitors to protect carbon steel look of a percent efficiency inhibitor that is 94.89% at a concentration of 600 ppm temperature 30°C in a HCl corrosive agent solution of 0.5 M. FH corrosion inhibitor adsorption isotherm is followed Langmuir adsorption isotherm. FH corrosion inhibitor application with concentration 600 ppm at temperature 60°C with a contact time of 36 hours gave % inhibitor efficiency above 90% in the brine solution synthesis."