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

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Journal of Materials Science & Technology 2022年第29期124卷 141-149页

作者： Chao Liu Reynier I.Revilla Xuan Li Zaihao Jiang Shufeng Yang Zhongyu Cui Dawei Zhang Herman Terryn Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Department of Materials and Chemistry Research Group Electrochemical and Surface EngineeringVrije Universiteit BrusselBrusselsBelgium School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Material Science and Engineering Ocean University of ChinaQingdao 266100China

This work investigated the chemical and electrochemical mechanisms of localised corrosion triggered by CaS·xMgO·y Al_(2)O_(3)·TiN complex inclusions in high strength low alloy steel(HSLAS)under a simulated marine *** focus was given to the role of the TiN portion of the inclusion on the initiation and growth of the corrosion *** thermodynamic process of pitting initiation was investigated by Gibbs free energy,pourbaix diagram and first principle *** corrosion is mainly induced by inclusions and triggered by dissolution of adjacent distorted *** dissolution of CaS portion in CaS·xMgO·y Al_(2)O_(3)·TiN complex inclusion creates an acidic aggressive environment that accelerates the further dissolution of inclusion and *** coupling effect between TiN inclusion and matrix is directly *** covered with a TiOfilm acts as the cathodic phase in galvanic corrosion,although it has a lower Volta potential than the *** is an unusual correlation with the scanning Kelvin probe force microscopy result,which has been explained for this special system.

关键词： High strength low alloy steel TiN-containing inclusion Localised corrosion pourbaix diagram First principle calculation

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A new look atφ-pH diagram(Ⅰ)——All-equilibriumφ-pH diagram for M-H_(2)O system

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中国有色金属学会会刊：英文版 2000年第6期10卷 808-812页

作者：刘海霞张传福曾德文 Department of Metallurgy Science and Engineering Central South UniversityChangsha 410083P.R.China

A new viewpoint of computer program poubaix diagram was proposed on traditional φ pH diagrams. All equilibrium principle and activity term method were used to plot φ pH diagrams for M H 2O systems based on the thermochemical database developed. And a new method——arithmetic geometric method is used to solve nonlinear equations group. The calculation procedure is proved to be efficient and convergent. The method seldom depends on artificial intervention and can extend to multi component all equilibrium φ pH diagrams such as M ligand H 2O system. [

关键词： pourbaix diagram activity term method all-equilibrium nonlinear equation group Pb-H_(2)O system

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