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乙酸对304不锈钢在氯化钠溶液中的亚稳态点蚀的影响。

Effect of HAc on the Metastable Pitting Corrosion of 304 SS in NaCl Solution.

作者信息

Zhang Hanlu, Huang Wenqiang, Wei Han, Chen Zilong, Cao Jingyi, Tang Yuming, Zhao Xuhui, Zuo Yu

机构信息

No. 92228 of the People's Liberation Army, Beijing 100072, China.

Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.

出版信息

Materials (Basel). 2022 May 18;15(10):3618. doi: 10.3390/ma15103618.

DOI:10.3390/ma15103618
PMID:35629644
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9144796/
Abstract

Stainless steels (SSs) easily suffer localized corrosion damage, such as pitting corrosion, in mixed solutions of acetic acid and sodium chloride. Currently, few works have been focused on the early stages of the pitting corrosion (metastable pitting corrosion) process of SSs in a chloride-HAc mixture solution. In this work, the effects of acetic acid (HAc) and its concentration on metastable pitting corrosion and the uniform corrosion of 304 SS in 0.6 mol/L NaCl solution were investigated by a slow-scanning potentiodynamic polarization test, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The results show that the uniform corrosion rate of 304 SS increases after HAc addition but, with an increase in HAc concentration, the corrosion rate decreases. In the presence of HAc, the metastable pitting potential () and stable pitting potential () move negatively, but the number of metastable pits notably decreases. HAc has a promoting action on the growth rate of the metastable pits and facilitates the transition from metastable pits to stable pits. The influence of HAc is related to a decrease in solution pH and the chemical adsorption of HAc.

摘要

在乙酸和氯化钠的混合溶液中，不锈钢（SSs）很容易遭受局部腐蚀破坏，如点蚀。目前，很少有研究关注不锈钢在氯化物 - 乙酸混合溶液中点蚀（亚稳态点蚀）过程的早期阶段。在本工作中，通过慢扫描动电位极化试验、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）研究了乙酸（HAc）及其浓度对304不锈钢在0.6 mol/L氯化钠溶液中亚稳态点蚀和均匀腐蚀的影响。结果表明，添加HAc后304不锈钢的均匀腐蚀速率增加，但随着HAc浓度的增加，腐蚀速率降低。在有HAc存在的情况下，亚稳态点蚀电位（）和稳态点蚀电位（）负移，但亚稳态点的数量显著减少。HAc对亚稳态点蚀的生长速率有促进作用，并促进亚稳态点向稳态点的转变。HAc的影响与溶液pH值的降低和HAc的化学吸附有关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/4bebb9f529d0/materials-15-03618-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/d60f2396c7ea/materials-15-03618-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/9f97361e2a95/materials-15-03618-g004.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/119ad60cd93d/materials-15-03618-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/8a18733096b2/materials-15-03618-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/619153b0b982/materials-15-03618-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/4bebb9f529d0/materials-15-03618-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/d60f2396c7ea/materials-15-03618-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/01c05768b07d/materials-15-03618-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/d6458fd9fe7c/materials-15-03618-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/6a1d99014ba3/materials-15-03618-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/119ad60cd93d/materials-15-03618-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/8a18733096b2/materials-15-03618-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/619153b0b982/materials-15-03618-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1662/9144796/4bebb9f529d0/materials-15-03618-g010.jpg

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本文引用的文献

1
Investigation of Acetic Acid Effect on Carbon Steel Corrosion in CO-HS Medium: Mechanistic Reaction Pathway and Kinetics.乙酸对CO-H₂S介质中碳钢腐蚀的影响研究：反应机理途径与动力学
ACS Omega. 2020 May 11;5(20):11378-11388. doi: 10.1021/acsomega.0c00387. eCollection 2020 May 26.
2
Correlation between evolution of inclusions and pitting corrosion in 304 stainless steel with yttrium addition.添加钇的304不锈钢中夹杂物演变与点蚀之间的相关性
Sci Rep. 2018 Mar 19;8(1):4830. doi: 10.1038/s41598-018-23273-x.
3
Potentiodynamic study of Al-Mg alloy with superhydrophobic coating in photobiologically active/not active natural seawater.
在光生物活性/非活性天然海水中具有超疏水涂层的铝镁合金的动电位研究
Colloids Surf B Biointerfaces. 2016 Jan 1;137:167-75. doi: 10.1016/j.colsurfb.2015.07.045. Epub 2015 Jul 26.