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| Effect of Nitric Acid Passivation on Critical Cl- Concentration for Corrosion of 304 Stainless Steel in Simulated Concrete Pore Solution |
AN Yiqiang, WANG Xin, CUI Zhongyu( ) |
| School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China |
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Abstract The corrosion resistance of 304 stainless steel passivated by nitric acid in simulated concrete pore solutions was studied through the polarization curves, electrochemical impedance spectroscopy (EIS) and Mott-Schottky measurement. The results indicate that the critical Cl- concentration for the corrosion of 304 stainless steel in the simulated concrete pore solution was increased after nitric acid passivation. The bare steel and the steel subjected to passivation treatment for 0.5, 2 and 24 h presented different range of critical chloride ion concentrations, namely 0.05~0.1, 4~5, 2~4 and 1~2 mol/L, respectively. The Mott-Schottky test results show that the nitric acid passivation treatment reduces the carrier density of the passivation film and increases the stability of the film. The EIS measurement by potentiostatic polarization is suitable for detecting the critical Cl- concentration.
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Received: 12 November 2020
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| Fund: Fundamental Research Funds for the Central Universities(201762008) |
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Corresponding Authors:
CUI Zhongyu
E-mail: cuizhongyu@ouc.edu.cn
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About author: CUI Zhongyu, E-mail: cuizhongyu@ouc.edu.cn
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