Role of Te-RE alloying on the passive film and pitting corrosion behavior of 316L stainless steel

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2024-09-16 DOI:10.1016/j.corsci.2024.112457

Zhichao Che , Reynier I. Revilla , Can Li , Jing Liu , Wei Liu , Benny Wouters , Kristof Marcoen , Xuequn Cheng , Chao Liu , Xiaogang Li

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Abstract

This work reports the mechanism of corrosion resistance enhancement of 316 L stainless steel after Te-RE alloying. The individual MnS inclusions are replaced by composite inclusions, resulting in a reduced risk of pitting corrosion. The decrease of inclusion amount and Volta potential difference between inclusion and matrix induced by the addition of Te/La promoted the stability of the inclusions and lessened the active sites for pitting corrosion. TeO₂ formed in the passive film with Te treatment could be easily reduced by Cr and Mo, and resulting in a significant increasing of MoO₂ and Cr₂O₃ content in the passive film. This enhanced the stability of the passive film. Te and RE exhibited a synergistic effect on the increase of Cr and Mo in the passive film, resulting in a further improvement of the passive film. However, RE could not exist in the passive film stably due to its poor thermodynamic stability of the rare earth oxides, and only acted as a bridge for the formation of Cr and Mo oxides.

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Te-RE 合金对 316L 不锈钢被动膜和点蚀行为的影响

这项研究报告了经过 Te-RE 合金处理后 316 L 不锈钢耐腐蚀性增强的机理。单个的 MnS 夹杂被复合夹杂物所取代，从而降低了点腐蚀的风险。添加 Te/La 引起的夹杂物数量和夹杂物与基体之间的伏特电位差的减少促进了夹杂物的稳定性，并减少了点蚀的活性位点。经 Te 处理的被动膜中形成的 TeO2 很容易被 Cr 和 Mo 还原，从而使被动膜中的 MoO2 和 Cr2O3 含量显著增加。这增强了被动膜的稳定性。Te 和 RE 对被动膜中 Cr 和 Mo 的增加有协同作用，从而进一步改善了被动膜。然而，由于稀土氧化物的热力学稳定性较差，RE 无法在被动膜中稳定存在，只能作为形成铬和钼氧化物的桥梁。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.