Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

IF 1.5 Q4 ELECTROCHEMISTRY International Journal of Corrosion Pub Date : 2017-10-12 DOI:10.1155/2017/4927210

R. C. Souza, L. R. Pereira, L. M. Starling, J. N. Pereira, T. A. Simões, J. Gomes, A. Bueno

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引用次数: 7

Abstract

The aim of this research was to evaluate the influence of microstructure on hydrogen permeation of weld and API X52 base metal under cathodic protection. The microstructures analyzed were of the API X52, as received, quenched, and annealed, and the welded zone. The test was performed in base metal (BM), quenched base metal (QBM), annealed base metal (ABM), and weld metal (WM). Hydrogen permeation flows were evaluated using electrochemical tests in a Devanathan cell. The potentiodynamic polarization curves were carried out to evaluate the corrosion resistance of each microstructure. All tests were carried out in synthetic soil solutions NS4 and NS4 + sodium thiosulfate at 25°C. The sodium thiosulfate was used to simulate sulfate reduction bacteria (SRB). Through polarization, assays established that the microstructure does not influence the corrosion resistance. The permeation tests showed that weld metal had lower hydrogen flow than base metal as received, quenched, and annealed.

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阴极保护下焊缝及API X52管线钢基体中氢扩散的微观组织影响

本研究的目的是评价阴极保护下焊缝和API X52母材微观组织对渗氢的影响。所分析的组织为API X52的接收、淬火、退火和焊接区。试验在母材(BM)、淬火母材(QBM)、退火母材(ABM)和焊接金属(WM)中进行。在Devanathan电池中使用电化学测试来评估氢渗透流动。通过动电位极化曲线对各组织的耐蚀性进行了评价。所有试验均在合成土壤溶液NS4和NS4 +硫代硫酸钠中进行，温度为25℃。采用硫代硫酸钠模拟硫酸盐还原菌(SRB)。通过极化分析，确定了微观组织不影响耐蚀性。渗透试验表明，在接收、淬火和退火过程中，焊缝金属的氢流量低于母材。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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