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Hery Tristijanto
Politeknik Negeri Semarang
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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MENINGKATAN KETAHANAN KOROSI PADA SAMBUNGAN LONGITUDINAL LAS RESISTENSI LISTRIK PIPA BAJA API 5L X – 46 DENGAN PERLAKUAN PANAS PASKA PENGELASAN Hery Tristijanto
JURNAL FOUNDRY Vol. 2 No. 2 (2012): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

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Abstract

Masalah yang sering terjadi pada proses produksi minyak bumi adanya kebocoran yang dialami oleh pipa penyalur minyak bumi hasil pengeboran. Kebocoran ini biasanya disebabkan oleh korosi. Maka upaya untuk meningkatkan ketahanan korosi pada sambungan longitudinal las pipa baja API 5L X – 46 yang dilas menggunakan las resistensi listrik dengan melakukan perlakuan panas paska pengelasan, variasi suhu 450 C, 550 C, dan 650 C. Setelah diberikan perlakuan panas paska pengelasan tidak terjadi perubahan struk tur mikro pada daerah las, HAZ dan logam induk akan tetapi terjadi pengasaran butir dan hilangnya orientasi butir pada ferit dan perlit. Dan Terjadi penurunan laju korosi dari tanpa perlakuan panas paska pengelasanke perlakuan panas paska pengelasan 650 C dari 0,008875 mm/yr menjadi 0,006206 mm/yr.
The Mixture of Molybdate and Ethoxylated Fatty Amines as Corrosion Protection in SAW Weld Joints of API 5L X-52 Pipeline Steel 3.5% NaCl Solution: Electrochemical Study Hery Tristijanto; Mochammad Noer Ilman; Priyo Tri Iswanto
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3190

Abstract

Steel widely used as pipelines in oil and gas transmission was susceptible to corrosion attack. In the present study, the corrosion inhibitions of sodium molybdate (SM) and ethoxylated fatty amine (EFA) for corrosion of carbon steel (API 5L X-52 steel welded pipelines) at base metal (BM), weld metal (WM), and heat affected zone (HAZ) in 3.5% NaCl solution was studied experimentally using potential dynamic polarization and electrochemical impedance spectroscopy (EIS). The results indicated that Tafel polarization investigations showed that the corrosion potentials shift to a positive direction in the BM, HAZ, and WM areas, and the corrosion rate density moves to the left. The decreased corrosion rate was related to form a passive film on the steel surface. Electrochemical impedance spectroscopy (EIS) measurements show that two-time constants appear, the first in the mid-high frequency range related to the corrosion process between the metal surface and Mo ions. The second in the low-frequency range is related to the formation of the two metal layers, Oxide/hydroxide. Thus, the corrosion protection of steel has been confirmed. The most excellent inhibitor efficiency, when the concentration of the SM was 0.4%, and EFA was 400 ppm, occurred in BM, WM, and HAZ, respectively
Co-Authors Mochammad Noer Ilman Priyo Tri Iswanto