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The Effect of Alloy Element of Low Alloy Carbon Steel on Hydrogen Entry in Sour Conditions

机译：酸性条件下低合金碳钢合金元素对氢进入的影响

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Hydrogen Induced Cracking (HIC) is a major issue of line pipe steels exposed to sour environments. Enormous efforts in research and production have been done by steel makers to improve HIC resistance. It is widely recognized that adding copper is effective to decrease HIC susceptibility in mildly sour environments with high solution pH (normally more than 5.0). However, the mechanism to describe the effect of Cu on the HIC suppression has not been fully clarified. In this study, hydrogen permeation testing was conducted in sour conditions using Devanathan type cell and the effect of Cu on HIC resistance was investigated under two different sour conditions (0.1 MPa H_2S and 0.001 MPa H_2S). Corrosion product formed on surface was also investigated to characterize its structure and element distribution when it has protective performance against hydrogen entry. From those electrochemical measurements and analysis techniques, it was found that Cu tended to be enriched near the steel in the corrosion product and that suppress hydrogen entry in mildly sour conditions at 0.1 MPa H_2S. However, remarkable effect of Cu was not observed under low H_2S partial pressure. The mechanism of HIC suppression by Cu addition will be discussed in this paper.
机译：氢致开裂（HIC）是暴露在酸性环境中的管线钢的主要问题。钢铁制造商已经在研究和生产方面做出了巨大的努力，以提高抗HIC性能。众所周知，在溶液pH值较高（通常大于5.0）的温和酸环境中，添加铜可有效降低HIC敏感性。但是，尚未完全阐明描述Cu对HIC抑制作用的机理。在这项研究中，使用Devanathan型电池在酸性条件下进行了氢渗透测试，并研究了Cu在两种不同的酸性条件下（0.1 MPa H_2S和0.001 MPa H_2S）对HIC抗性的影响。还研究了表面形成的腐蚀产物，以表征其结构和元素分布（当它具有防止氢进入的保护性能时）。通过这些电化学测量和分析技术，发现在腐蚀产物中，Cu倾向于富集在钢附近，并且在0.1MPa H_2S的温和酸性条件下抑制了氢的进入。然而，在低H_2S分压下未观察到Cu的显着效果。本文将讨论通过添加铜抑制HIC的机理。

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