Untypical Electrochemical Corrosion Behavior of High-Nitrogen Austenitic Stainless Steel: Non-Pitting in Transpassivation

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-07-04 DOI:10.1007/s40195-024-01743-8

Qisi Wang, Qingchuan Wang, Xingxing Wang, Fan Liu, Ke Yang

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Abstract

The transpassivation and pitting corrosion behavior of a high-nitrogen stainless steel (HNS), Fe18Cr15Mn3Mo0.92N, were systematically investigated by electrochemical analysis, morphology observation, and X-ray photoelectron spectroscopy surface analysis. It was surprisingly found that no pitting corrosion occurred in the transpassivation region of HNS. This electrochemical corrosion behavior is untypical for stainless steels, i.e., the traditional critical pitting potential method was invalid for HNS. Both N and Cr enrichments in the transpassivation film on HNS were found extremely higher than those in the passivation film. The N existed in the form of [CrN] complex, which could stabilize the above both films. Besides, the corrosion product of N was detected as NH₃ that exhibited an effective corrosion inhibition effect. On this basis, although the transition of Cr from 3-valent to 6-valent was confirmed, the transpassivation film on HNS still maintained it high stability and no pitting was found to occur. Therefore, the real pitting resistance of HNS should be higher than the expected before. And the stable transpassivation film played an important role in its untypical pitting corrosion resistance.

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高氮奥氏体不锈钢的非典型电化学腐蚀行为：半钝化中的非点蚀

通过电化学分析、形貌观察和 X 射线光电子能谱表面分析，系统研究了高氮不锈钢（HNS）Fe18Cr15Mn3Mo0.92N 的过钝化和点腐蚀行为。结果令人惊讶地发现，在 HNS 的过钝化区域没有发生点腐蚀。这种电化学腐蚀行为在不锈钢中并不典型，也就是说，传统的临界点蚀电位法对 HNS 无效。在 HNS 的过钝化膜中，发现 N 和 Cr 的富集度都远远高于钝化膜。N 以[CrN]络合物的形式存在，可以稳定上述两种膜。此外，还检测到 N 的腐蚀产物为 NH3，表现出有效的缓蚀效果。在此基础上，虽然证实了铬从 3 价转变为 6 价，但 HNS 上的过钝化膜仍然保持了较高的稳定性，没有发现点蚀现象。因此，HNS 的实际抗点蚀性能应高于之前的预期。而稳定的过钝化膜在其非典型耐点蚀性中发挥了重要作用。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.