Corrosion behavior of 907 steel under thin electrolyte layers of artificial seawater
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：WANG Hui-ping(王慧萍) DING Shao-chun(丁少春) ZHU Juan(朱娟) ZHANG Zhao(张昭) ZHANG Jian-qing(张鉴清) CAO Chu-nan(曹楚南)
文章页码：800 - 814
Key words：907 steel; atmospheric corrosion; electrochemical impedance spectroscopy; polarization
Abstract: The corrosion behavior of 907 steel under thin electrolyte layer (TEL) has been investigated by means of cathodic polarization curve measurement, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results show that the cathodic diffusion current density presents the variation trend of initial increase and subsequent decrease with the decrease of TEL thickness, and the maximum deposits at 58 μm. The cotangent-hyperbolic impedance (O) is rationally first introduced to study the diffusion process of the reactants through the corrosion products layer with many permeable holes. The initial corrosion rate of 907 steel under different TEL thickness increases with the decrease of TEL thickness except that of 104 μm, whereas the corrosion rate after long time corrosion can be ranked as 104 μm﹥402 μm﹥198 μm﹥301 μm﹥bulk solution.
WANG Hui-ping(王慧萍)1, DING Shao-chun(丁少春)2, ZHU Juan(朱娟)1, ZHANG Zhao(张昭)1, ZHANG Jian-qing(张鉴清)1, 3, CAO Chu-nan(曹楚南)1
(1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
2. Scientific Research Office, Naval University of Engineering, Wuhan 430033, China;
3. State Key Laboratory for Corrosion and Protection of Metals, Shenyang 110016, China)
Abstract:The corrosion behavior of 907 steel under thin electrolyte layer (TEL) has been investigated by means of cathodic polarization curve measurement, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results show that the cathodic diffusion current density presents the variation trend of initial increase and subsequent decrease with the decrease of TEL thickness, and the maximum deposits at 58 μm. The cotangent-hyperbolic impedance (O) is rationally first introduced to study the diffusion process of the reactants through the corrosion products layer with many permeable holes. The initial corrosion rate of 907 steel under different TEL thickness increases with the decrease of TEL thickness except that of 104 μm, whereas the corrosion rate after long time corrosion can be ranked as 104 μm﹥402 μm﹥198 μm﹥301 μm﹥bulk solution.
Key words:907 steel; atmospheric corrosion; electrochemical impedance spectroscopy; polarization
