材料科学技术(英文版)2022，Issue(29) ：141-149.

New insights into the mechanism of localised corrosion induced by TiN-containing inclusions in high strength low alloy steel

Chao Liu Reynier I.Revilla Xuan Li Zaihao Jiang Shufeng Yang Zhongyu Cui Dawei Zhang Herman Terryn Xiaogang Li
材料科学技术(英文版)2022，Issue(29) ：141-149.
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  • 维普
  • 万方数据

New insights into the mechanism of localised corrosion induced by TiN-containing inclusions in high strength low alloy steel

Chao Liu 1Reynier I.Revilla 2Xuan Li 3Zaihao Jiang 3Shufeng Yang 4Zhongyu Cui 5Dawei Zhang 1Herman Terryn 6Xiaogang Li1
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作者信息

  • 1. Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;National Materials Corrosion and Protection Data Center,University of Science and Technology Beijing,Beijing 100083,China
  • 2. Department of Materials and Chemistry,Research Group Electrochemical and Surface Engineering,Vrije Universiteit Brussel,Brussels,Belgium
  • 3. Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China
  • 4. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • 5. Department of Material Science and Engineering,Ocean University of China,Qingdao 266100,China
  • 6. Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Department of Materials and Chemistry,Research Group Electrochemical and Surface Engineering,Vrije Universiteit Brussel,Brussels,Belgium
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Abstract

This work investigated the chemical and electrochemical mechanisms of localised corrosion triggered by CaS·xMgO·yAl2O3·TiN complex inclusions in high strength low alloy steel(HSLAS)under a simulated ma-rine environment.Special focus was given to the role of the TiN portion of the inclusion on the initiation and growth of the corrosion pits.The thermodynamic process of pitting initiation was investigated by Gibbs free energy,Pourbaix diagram and first principle calculation.Localised corrosion is mainly induced by inclusions and triggered by dissolution of adjacent distorted matrix.Chemical dissolution of CaS por-tion in CaS·xMgO·yAl2O3·TiN complex inclusion creates an acidic aggressive environment that accelerates the further dissolution of inclusion and matrix.Galvanic coupling effect between TiN inclusion and ma-trix is directly verified.TiN covered with a TiO2 film acts as the cathodic phase in galvanic corrosion,although it has a lower Volta potential than the matrix.This is an unusual correlation with the scanning Kelvin probe force microscopy result,which has been explained for this special system.

Key words

High strength low alloy steel/TiN-containing inclusion/Localised corrosion/Pourbaix diagram/First principle calculation

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基金项目

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量50
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