Corrosion behavior of 907 steel under thin electrolyte layers of artificial seawater

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...

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Bibliographic Details
Published in:Journal of Central South University 2015-03, Vol.22 (3), p.806-814
Main Authors: Wang, Hui-ping, Ding, Shao-chun, Zhu, Juan, Zhang, Zhao, Zhang, Jian-qing, Cao, Chu-nan
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary: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.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-015-2586-7