Research on Pitting Corrosion of Micro-alloyed High Strength Steel Bars

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-21 DOI:10.5006/4479

QingLong Wu, Shangjun Gu, Jie Wang, Fulong Wei, Zhiying Li, Hui Yang, Changrong Li

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Abstract

In this study, a series of soaking experiments were conducted in simulated marine environment solution to explore the pitting corrosion behavior induced by four types of inclusions in micro-alloyed steel bars: Al2O3, MnS, Al2O3-(Ti,V,Nb)N and Al2O3-MnS-(Ti,V,Nb)N. In the early stage of corrosion, due to the high-density lattice distortion zone around the MnS and Al2O3 inclusions, along with the fact that these inclusions are not closely connected with the steel matrix, micro-cracks can occur leading to the initial corrosion of MnS in the Cl- environment. The corrosion rate of Al2O3 is the second highest after MnS, and clusters of Al2O3 can further accelerate the corrosion rate. The lattice distortion density around (Ti, V, Nb)N precipitates is significantly lower than that around MnS and Al2O3 inclusions. Additionally, (Ti, V, Nb)N is closely connected with the steel matrix without any micro-voids. Therefore, (Ti, V, Nb)N is not sufficient to induce pitting corrosion of the matrix. The trend of pitting corrosion induced by the four types of inclusions, Al2O3, MnS, Al2O3-(Ti,V,Nb)N, and Al2O3-MnS-(Ti,V,Nb)N, is as follows: MnS > Al2O3> Al2O3-MnS-(Ti,V,Nb)N > Al2O3-(Ti,V,Nb)N.

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微合金高强度钢棒的点腐蚀研究

本研究在模拟海洋环境溶液中进行了一系列浸泡实验，以探讨微合金钢棒中四种夹杂物诱发的点蚀行为：Al2O3、MnS、Al2O3-(Ti,V,Nb)N 和 Al2O3-MnS-(Ti,V,Nb)N。在腐蚀初期，由于 MnS 和 Al2O3 夹杂物周围存在高密度晶格畸变区，加之这些夹杂物与钢基体的连接并不紧密，因此会产生微裂纹，导致 MnS 在 Cl- 环境中发生初始腐蚀。Al2O3 的腐蚀速率仅次于 MnS，而 Al2O3 簇会进一步加快腐蚀速率。(Ti、V、Nb)N析出物周围的晶格畸变密度明显低于 MnS 和 Al2O3 包裹体周围的晶格畸变密度。此外，（Ti，V，Nb）N 与钢基体紧密相连，没有任何微空隙。因此，（Ti、V、Nb）N 不足以诱发基体点蚀。四种夹杂物（Al2O3、MnS、Al2O3-（Ti,V,Nb）N 和 Al2O3-MnS-(Ti,V,Nb)N ）诱发点蚀的趋势如下：MnS>Al2O3>Al2O3-MnS-（Ti,V,Nb）N>Al2O3-（Ti,V,Nb）N。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.