Sulfide stress corrosion study of a super martensitic stainless steel in H2S sour environments: Metallic sulfides formation and hydrogen embrittlement
Sulfide stress corrosion study of a super martensitic stainless steel in H2S sour environments: Metallic sulfides formation and hydrogen embrittlement
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DOI：
10.1016/j.apsusc.2016.10.072
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发表时间：
2017-02-01
影响因子：
6.7
通讯作者：
Mantel, Marc
中科院分区：
文献类型：
--
作者：
Monnot, Martin;Nogueira, Ricardo P.;Mantel, Marc
由于其高耐腐蚀性，超级马氏体不锈钢通常用于石油和天然气工业，特别是在酸性环境中。然而，某些等级的不锈钢在存在H2S的情况下易受氢和机械辅助腐蚀过程的影响，具体取决于pH值。EN 1.4418等级的马氏体不锈钢在暴露于pH >= 4的酸性环境时，表现出明显的保护性钝化行为，没有硫化物应力腐蚀开裂，但在较低pH值条件下，其耐腐蚀性急剧下降。本文研究了这种突然失去的耐腐蚀性与电化学测量以及不同的物理化学表征技术。结果表明，低于pH值4.0的金属表面覆盖着一个厚（约40 μ m）多孔和缺陷充分的硫化物丰富的腐蚀产物层显示是直接相关的氢和硫化物的机械辅助腐蚀现象的发病。(C)2016爱思唯尔B.V.保留所有权利。
Thanks to their high corrosion resistance, super martensitic stainless steels are commonly used in the oil and gas industry, particularly in sour environments. Some grades are however susceptible to undergo hydrogen and mechanically-assisted corrosion processes in the presence of H2S, depending on the pH. The martensitic stainless steel EN 1.4418 grade exhibits a clear protective passive behavior with no sulfide stress corrosion cracking when exposed to sour environments of pH >= 4, but undergoes a steep decrease in its corrosion resistance at lower pH conditions. The present paper investigated this abrupt loss of corrosion resistance with electrochemical measurements as well as different physicochemical characterization techniques. Results indicated that below pH 4.0 the metal surface is covered by a thick (ca 40 mu m) porous and defect-full sulfide-rich corrosion products layer shown to be straightforwardly related to the onset of hydrogen and sulfide mechanically-assisted corrosion phenomena. (C) 2016 Elsevier B.V. All rights reserved.