通过原位生长纳米氧化膜揭示316L不锈钢的耐腐蚀性

Revealing the Corrosion Resistance of 316 L Stainless Steel by an In Situ Grown Nano Oxide Film.

作者信息

Ren Ying, Li Yuchen, Shen Jun, Wu Shaojun, Liu Liting, Zhou Genshu

机构信息

Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

Analytical and Testing Center, Northwestern Polytechnical University, Xi'an 710060, China.

出版信息

Nanomaterials (Basel). 2023 Jan 31;13(3):578. doi: 10.3390/nano13030578.

DOI:10.3390/nano13030578

PMID:36770539

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9920300/

Abstract

It is widely accepted that the corrosion resistance of stainless steel originates from a compact CrO layer in the native passive film that serves as a barrier to aggressive ions. However, this suggestion has been questioned by some researchers. They believe that protectiveness might be related to the film recovery. Herein, the pitting development of bare 316 L stainless steel was compared with a corrosion-resistance enhanced steel obtained by tuning the native passive film of the alloy. Statistical software was employed for tracing the size and number of pits on the alloy surface. The statistical results for 12 weeks in 1 M sodium chloride solution (80 °C) revealed that there was a crossover in the growing rates of stable pits (diameter > 9 µm) between the bare alloy and the film-enhanced one. Stable pits on bare 316 L occurred early but showed a comparatively slow increase in the following weeks, demonstrating that self-repairability of metastable pits rather than impermeability of the native passive film plays the key role in the early stage of pitting corrosion.

摘要

人们普遍认为，不锈钢的耐腐蚀性源于自然钝化膜中致密的CrO层，该层可作为侵蚀性离子的屏障。然而，这一观点受到了一些研究人员的质疑。他们认为，保护性能可能与膜的恢复有关。在此，将裸316L不锈钢的点蚀发展情况与通过调整合金自然钝化膜获得的耐腐蚀增强钢进行了比较。使用统计软件跟踪合金表面点蚀的尺寸和数量。在1M氯化钠溶液（80°C）中进行12周的统计结果表明，裸合金和膜增强合金上稳定点蚀（直径>9µm）的生长速率存在交叉。裸316L上的稳定点蚀出现较早，但在接下来的几周内增长相对缓慢，这表明亚稳态点蚀的自修复能力而非自然钝化膜的不渗透性在点蚀腐蚀的早期阶段起关键作用。