Effect of chloride ions on 316L stainless steel in cyclic cooling water

金属学报(英文版), 2010, 23(6): 431-438.

^1, , ^2, , ^3, , ^4,

1.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

2.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

3.Equipment and Power Department,Shijiazhuang Refine & Chemical Company Limited,SINOPEC,Shijiazhuang 050032,China

4.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

基金项目: the National Natural Science Foundation of China(50871020) Science & Technology Program of Beijing(D09030303790901)

Effect of chloride ions on 316L stainless steel in cyclic cooling water

Zuojia LIU ^1, , Xuequn CHENG ^2, , Shengjie L(U) ^3, , Xiaogang LI ^4,

1.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

2.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

3.Equipment and Power Department,Shijiazhuang Refine & Chemical Company Limited,SINOPEC,Shijiazhuang 050032,China

4.Key Laboratory of Corrosion and Protection (Ministry of Education of China),University of Science and Technology Beijing,Beijing 100083,China

Keywords： Polarization curve

The effect of Cl- on the 316L stainless steel in simulated cooling water has been studied using polarization curves, electrochemical impedance spectroscopy (EIS), Mott-Schottky plot and scanning electron microscopy (SEM) techniques. Cl- concentrations vary from 200 to 900 mg/L. Results reveal that the corrosion resistance increases with the decrease of Cl- concentration in simulated cooling water. The increase of Cl- concentration leads to the shift of the corrosion potential towards the positive direction. Mott-Schottky curves show that in the passive film, Cr2O3 and FeO at the inner layer exhibit P-type but Fe2O3 and CrO3 (CrO2-4) N-type semiconductive properties. The SEM/EDX data demonstrate that elements such as Fe, O, C, Si and Cl as well as the presence of calcium and aluminum are presented on the surface of the metal.

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Effect of chloride ions on 316L stainless steel in cyclic cooling water

参考文献