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All Journal TEKNIK Teknologi Indonesia Metalurgi Piston: Journal of Technical Engineering Jurnal Litbang Polri Jurnal Sains Materi Indonesia
Gadang Priyotomo
Research Center for Metallurgy and Material, Indonesian Institute of Sciences, Serpong, Tangerang
Aerospace Engineering Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Journal : Metalurgi

 1 
Studi Inhibitor Korosi Berbasis Imidazoline Salt Pada Brine Water Di Pipa Penyalur Minyak Mentah [Studies of Imidazoline Salt Inhibitor for Brine Water in Crude Oil Pipeline] Nuraini, Lutviasari; Priyotomo, Gadang; Nasoetion, Ronald; Harsisto, Harsisto
Metalurgi Vol 31, No 2 (2016): Metalurgi Vol. 31 No. 2 Agustus 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.431 KB) | DOI: 10.14203/metalurgi.v31i2.62

Abstract

A study of imidazoline salt inhibitor for brine water in crude oil pipeline was carried out using tafel polarization test, Fourier Transform Infrared Spectroscopy (FTIR) and Electrochemical Impedance Spectroscopy (EIS). A type of specimen used in this research is API 5L grade B. The solution of brine water came from fluid in crude oil pipeline. The addition of commercial inhibitor of imidazoline salt base was conducted with range of 3-40 ppm for polarization test and range of 3-20 ppm for EIS test. The addition of imidazoline salt at 3-20 ppm is effective to decrease corrosion rate and to increase inhibitor efficiency up to 95% . The resistance of adsorbed molecule layer increase with the addition of inhibitor compared without inhibitor, where this addition could decrease the electrochemical reaction on the surface. The decrease of corrosion rate took place due to the presence of adsorbed thin layer in metal surface.AbstrakStudi kinerja inhibitor imidazoline salt pada brine water di pipa penyalur minyak mentah dilakukandengan melakukan pengujian tafel, Fourier Transform Infrared Spectroscopy (FTIR) dan Electrochemical Impedance Spectroscopy (EIS). Jenis spesimen uji baja yang digunakan dalam penelitian adalah API 5L dan larutan brine water berasal dari 70% dari total fluida di pipa penyalur minyak mentah. Penambahan inhibitor komersial berbasis imidazoline salt dilakukan dengan variasi 3 - 40 ppm untuk pengujian polarisasi dan variasi 3 - 20 ppm untuk pengujian EIS. Penambahan inhibitor berbasis imidazoline salt antara 3 – 20 ppm secara efektif dapat menurunkan nilai laju korosi dan meningkatkan efisiensi inhibitor hingga 95%. Tahanan lapisan adsorpsi molekul dengan penambahan inhibitor meningkat dibandingkan kondisi tanpa inhibitor, dimana hal ini dapat menurunkan aktifitas reaksi elektrokimia di permukaan baja. Penurunan laju korosi terjadi dikarenakan pembentukan lapisan tipis yang teradsopsi di permukaan logam.
Sifat Korosi Dari Material Berbasis Nb yang Mengandung 24% Berat Sn Pada Berbagai Konsentrasi Natrium Klorida [Corrosion Behavior Of Nb-Base Material Containing 24wt% Sn At Various Sodium Chloride Concentrations] Priyotomo, Gadang
Metalurgi Vol 30, No 1 (2015): Metalurgi Vol.30 No.1 APRIL 2015
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.032 KB) | DOI: 10.14203/metalurgi.v30i1.104

Abstract

Sifat korosi pada material berbasis Nb yang berisi 24% berat Sn yang terdiri dari fasa Nb3Sn dan NbSn2 telah diinvestigasi dengan menggunakan pengujian polarisasi, potensiostatik dan  metode analisis permukaan (SEM dan EDS) di dalam larutan netral NaCl. Pelarutan terseleksi pada fasa NbSn2  terjadi dengan konsentrasi rendah pada Nb dibandingkan dengan fasa Nb3Sn.  Melalui kurva polarisasi, rapat arus korosi dan laju korosi pada material meningkat dengan peningkatan konsentrasi klorida.   Pada daerah pasif, pelarutan terseleksi tidak terjadi pada dua fasa yang ada, namun pelarutan tersebut terjadi di daerah transpasif. Peningkatan konsentrasi klorida memberikan efek mengganggu terhadap ketahanan korosi pada material. Hasil yang didapat juga menjelaskan efek galvanik antara fasa-fasa yang menyebabkan kelarutan terseleksi pada fasa NbSn2. AbstractThe corrosion behavior of Nb-base material containing 24wt% Snthat are consisted of Nb3Sn and NbSn2phases, has been investigated using polarization test, potentiostatic test and surface analytical method (SEM;scanning electron microscope and EDS; Energy Dispersive Spectroscopy) in neutral NaClsolutions. It wasfound that the preferential dissolution of NbSn2 phase with a lower Nb concentration compared to Nb3Snphase. From polarization curves, the corrosion current density and corrosion rate of the material increasewith the increase of chloride concentration. In passive region, there is no preferential dissolution in both thephases, whereas the preferential dissolution of NbSn2 takes place in transpassive region. The increase ofchloride concentration has detrimental effect in the corrosion resistance of the material. The results obtainedwere also explained the galvanic effect between the phases generating for the preferential dissolution ofNbSn2 phase.
Pengaruh Penambahan Inhibitor Ekstrak Tembakau Terhadap Laju Korosi Internal Pipa API 5L X-52 Pada Artificial Brine Water Dengan Injeksi Gas CO2 [Effect of Addition of Extracted Tobacco Inhibitor to The Corrosion Rate of Internal Steel Pipe API 5L X-52 in Artificial Brine Water With CO2 Gas Injection] Ahmadi, Rapli Nur; Oediyani, Soesaptri; Priyotomo, Gadang
Metalurgi Vol 31, No 3 (2016): Metalurgi Vol. 31 No. 3 Desember 2016
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (827.178 KB) | DOI: 10.14203/metalurgi.v31i3.164

Abstract

Crude oil containing brine water with high concentration of NaCl and HCO3 and the presence of dissolved CO2 gas may increase the potential for corrosion in the pipeline. The use of natural corrosion inhibitor is one of the alternative to solve these problem. Natural materials were chosen as an alternative because it is safe, readily available, biodegradable, low cost, and environmentally friendly. This study was conducted to determine the effect of tobacco extracts on the rate of corrosion and inhibition efficiency. The novelty of this research is a continuous injection of CO2 gas that does not exist in previous research. Spectroscopy analysis was conducted to determine the chemical composition of samples of steel API 5L X-52, TLC densitometry was used to determine the levels of nicotine in tobacco sauce. Gamry Potensiostat Type 6:25 was used for testing the corrosion behavior, using the Tafel polarization and EIS methods. The results show that, the corrosion rate of samples decreased with the addition of tobacco extracts. The addition of 60 ppm of tobacco extract in a solution decrease corrosion rate samples at 8.95 mpy in ABW 1 and 9.87 mpy in ABW 2. Optimum inhibition efficiency occurs upon the addition of 60 ppm tobacco extracts, for the solution of ABW 1 by 79.51% and amounted to 80.94% ABW 2. The inhibition efficiency began to decline by the addition of 80 ppm, to 42.32% in ABW 1 by and 68.71% in ABW 2.AbstrakCrude oil yang mengandung brine water dengan kadar NaCl dan HCO3 - yang tinggi serta adanya gas CO2 yang terlarut dapat meningkatkan potensi korosi pada pipa. Penggunaan inhibitor korosi alami menjadi alternatif baru untuk menyelesaikan masalah tersebut. Bahan alam dipilih sebagai alternatif karena bersifat aman, mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan. Penelitian ini dilakukan untuk mengetahui pengaruh penambahan ekstrak tembakau terhadap laju korosi dan efisiensi inhibisi yang dihasilkan dengan menambahkan pembaharuan penelitian berupa penginjeksian gas CO2 secara kontinu yang belum ada pada penelitian sebelumnya. Pengujian pada penelitian ini menggunakan spectroscopy untuk mengetahui komposisi kimia sampel baja API 5L X-52, TLC. Densitometri digunakan untuk mengetahui kadar nikotin pada sampel tembakau. Gamry Potensiostat Type 6.25 digunakan untuk pengujian polarisasi Tafel dan EIS. Hasil penelitian menunjukkan bahwa data laju korosi baja API 5L X-52 mengalami penurunan dengan penambahan ekstrak tembakau. Penurunan optimum laju korosi terjadi pada penambahan 60 ppm ekstrak tembakau pada larutan ABW 1 sebesar 8,95 mpy dan ABW 2 sebesar 9,87 mpy. Peningkatan optimum efisiensi inhibisi terjadi pada penambahan 60 ppm ekstrak tembakau, untuk larutan ABW 1 sebesar 79,51% dan ABW 2 sebesar 80,94%. Efisiensi inhibisi mulai mengalami penurunan kembali pada penambahan 80 ppm, untuk larutan ABW 1 sebesar 42,32% dan ABW 2 sebesar 68,71%. 
Co-Authors Ahmadi, Rapli Nur ahsonul anam Astawa, I Nyoman Gede Putrayasa Astuti, Septi Fachry Abda El Rahman Hadi Gunawan, Hadi Harsisto, Harsisto Heri Nugraha Irawan, Januar J.W. Soedarsono Maldini, Noviar Rizky Nasoetion, Ronald Nikitasari, Arini Nuraini, Lutviasari Nuraini, Lutviasari Prifiharni, Siska Raslin, Harvin Rini Riastuti, Rini Rokhmanto, Fendy Royani, Ahmad Saragih, Agung Shamsudin Soesaptri Oediyani Sundjono, Sundjono Triwardono, Joko Wahyono, Ary