Role of MnS in the intergranular corrosion and depassivation of sensitized Type 304 stainless steel

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-01-05 DOI:10.1038/s41529-023-00419-5

Noriyuki Ida, Masashi Nishimoto, Izumi Muto, Yu Sugawara

引用次数: 0

Abstract

During polarization in 1 M NaCl (pH 5.4), intergranular corrosion of sensitized re-sulfurized Type 304 stainless steel occurred after pit initiation at MnS inclusions. Intergranular corrosion occurred when the pitting corrosion reached a Cr-depleted region along the sensitized grain boundaries. During depassivation under open-circuit conditions in 1 M NaCl (pH 1.0), MnS dissolution occurred as the first step, and the second step was the initiation of intergranular corrosion. Finally, dissolution of the steel matrix occurred. The role of MnS in the initiation of intergranular corrosion and depassivation of sensitized steel is discussed.

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MnS 在敏化 304 型不锈钢的晶间腐蚀和去钝化中的作用

在 1 M NaCl（pH 值为 5.4）的极化过程中，敏化再硫化 304 型不锈钢在 MnS 杂质处出现点蚀后发生了晶间腐蚀。当点蚀到达沿敏化晶界的贫铬区时，就会发生晶间腐蚀。在 1 M NaCl（pH 值为 1.0）的开路条件下进行去钝化时，第一步是 MnS 溶解，第二步是引发晶间腐蚀。最后，钢基体发生溶解。本文讨论了 MnS 在引发晶间腐蚀和敏化钢去钝化过程中的作用。

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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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies

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