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Localized corrosion of lean duplex stainless steels in H2S-containing wet atmosphere from urban wastewater treatment units
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-06-14 , DOI: 10.1002/maco.202112508
Nicolas Larché 1 , Benoit Emo 2 , Dominique Thierry 1 , Vincent Duquesnes 1 , Christophe Mendibide 1
Affiliation  

With lower alloying costs and higher mechanical properties, lean duplex stainless steels can be a good alternative to the more commonly used austenitic stainless steels. A study was initiated to define the limits of the use of lean duplex stainless steels for urban wastewater treatment (WWT) units. This paper gives and discusses the corrosion results in an aerated wet atmosphere containing H2S at different levels. Exposures were performed both at laboratory scale and in the field WWT plant for 1 year. A specific probe was also designed to study the corrosion process below water condensate film contaminated with H2S. Under such conditions, the properties of stainless steel were strongly modified with an enhanced risk of localized corrosion. The results obtained on lean duplex materials (UNS S32101, S32202, and S32304) are compared with austenitic UNS S30403 and UNS S31603 and with the more standard duplexes UNS S82441 and UNS S32205. The results show that lean duplexes can be used in aerated wet atmospheres in case of moderate contamination of H2S (<10 ppm) and chloride (<200 ppm). For higher contaminations (e.g., H2S around 100 ppm/chloride around 1000 ppm) the duplex S32205 should be preferred.

中文翻译:

城市污水处理装置含 H2S 潮湿环境中贫双相不锈钢的局部腐蚀

凭借较低的合金成本和较高的机械性能,贫双相不锈钢可以成为更常用的奥氏体不锈钢的良好替代品。启动了一项研究,以确定在城市污水处理 (WWT) 装置中使用贫双相不锈钢的限制。本文给出并讨论了在含不同水平H 2 S的充气潮湿环境中的腐蚀结果。暴露在实验室规模和现场 WWT 工厂中进行了 1 年。还设计了一个特定的探头来研究被 H 2污染的水冷凝膜下的腐蚀过程S. 在这种情况下,不锈钢的性能发生了强烈的变化,局部腐蚀的风险增加。在贫双相材料(UNS S32101、S32202 和 S32304)上获得的结果与奥氏体 UNS S30403 和 UNS S31603 以及更标准的双相材料 UNS S82441 和 UNS S32205 进行了比较。结果表明,在 H 2 S (<10 ppm) 和氯化物 (<200 ppm)中度污染的情况下,贫双链体可用于充气潮湿环境中。对于更高的污染(例如,约 100 ppm 的H 2 S/约 1000 ppm 的氯化物)应首选双相 S32205。
更新日期:2021-06-14
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