Corrosion of a 316L stainless steel in a gaseous environment polluted with HCl: Mechanism,Materials and Corrosion

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Corrosion of a 316L stainless steel in a gaseous environment polluted with HCl: Mechanism
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-07-28 , DOI: 10.1002/maco.202011883
Florence Lequien ₁ , Gervaise Moine ₁

Affiliation

The corrosion of a 316L stainless steel (SS) exposed to a humid gas flow polluted with HCl has been studied. The mixture is carried out in a reactor connected to two gas feedthroughs: one with wet air and one with HCl(g). The corrosion mechanism comprehension is based on several steps. The presence of humid air polluted by HCl involves the creation of a precursor film that can evolve to droplet formation. In contact with this acid and chloride concentrated electrolyte, the 316L SS corrodes producing soluble ferrous chloride. This corrosion product can evolve to the oxide formation, depending of the HCl concentration. For high concentrations, 316L SS corrodes uniformly. However, this phenomenon is accompanied by pits when the HCl concentration is not sufficient or the HCl flow is not continuous. The particularity of the corrosion mechanisms is shown as well as the problems using materials in an HCl‐polluted gaseous environment.

中文翻译：

316L不锈钢在被HCl污染的气体环境中的腐蚀：机理

研究了暴露于HCl污染的潮湿气流中的316L不锈钢（SS）的腐蚀。混合物在与两个进气管相连的反应器中进行：一个通入湿空气，另一个通入HCl（g）。腐蚀机理的理解是基于几个步骤的。HCl污染的潮湿空气的存在涉及到前驱膜的形成，该前驱膜会演变成液滴的形成。316L SS与这种酸和氯化物浓缩的电解液接触，会腐蚀生成可溶的氯化亚铁。根据HCl的浓度，这种腐蚀产物可能演变成氧化物。对于高浓度，316L SS会均匀腐蚀。但是，当HCl浓度不足或HCl流动不连续时，会出现这种现象。

更新日期：2020-07-28

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