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| Correlation Between Corrosion Behavior and Image Information of Q235 Steel Beneath Thin Electrolyte Film |
Xinxin ZHANG1,Zhiming GAO1( ),Wenbin HU1,Zhipeng WU1,Lianheng HAN1,Lihua LU1,Yan XIU2,Dahai XIA1 |
1 Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300350, China
2 Faculty of Science, Tianjin Chengjian University, Tianjin 300384, China |
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Abstract The corrosion behavior of Q235 steel beneath electrolyte thin films of 0.01 mol/L NaCl solution was conducted to simulate marine atmospheric corrosion by simultaneous electrochemical measurements and acquisition of corrosion images. The results show that atmospheric corrosion of Q235 steel initiates around pearlites and presents the character of local corrosion which developed to become uniform corrosion afterwards. According to the result of wire beam electrode (WBE) measurement, the mean corrosion potential and the corrosion potential standard deviation decreased, and the anode area enlarged with the exposure time. Analysis of the neural network shows that the content of α-FeOOH in rust layers increased with exposure time, which blocked the process of oxygen diffusion, resulting in the transformation of corrosion mode from local ones to uniform ones. In conclusion, when the electrochemical information shows that the corrosion tends to transform from the local ones to the uniform ones, correspondingly the image information also shows that a protective rust gradually formed with the increasing exposure time. Therefore, the corrosion behavior of Q235 steel presents well correlation with the feature of image information.
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Received: 05 May 2017
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| Fund: Supported by National Natural Science Foundation of China (51371124, 51671144), Major State Basic Research Development Program of China (2014CB046805) and MOE Project of Humanistic Science Research Younth Fund Project (11YJCZH202) |
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