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| ELECTROCHEMICAL BEHAVIOUR OF CORROSION OF CARBIDE-TYPE CHROMIZED LAYER IN SODIUM CHLORIDE SOLUTION |
| Xin Zhaoqing Li Zuohao; Zhao Yingying and Xiao Yide(Wuhan Research Institute of Material Protection) |
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Abstract The electrochemical behaviour of chromized layer on 45 and T_(10) steels was investigated with cyclic potentiodynamic anode polarization and other methods in 3％ NaCl solution. Similar investigations were carried out on some stainless steels for the purpose of comparison. A precedence phenomenon was observed in all chromized layer.s polarization curves in contrast to the hysteresis loops observed in the case of stainless steels. This indicated that there existed a specific state of passivation ensuring the very high resistance of the chromized layer to pitting and crevice corrosion in all concentrations and pH range of sodium chloride solution. Layer-by-layer electrochemical studies showed that the corrosion resistance was excellent on the chromium-rich outmost layer and decreased gradually on inner layers due to the lower chromium concentrations. Besides, galvanic cell could be formed between the outermost layer and inner layers as well as between chromized layer and substrate to induce the final deterioration of substrate steels when exposed.
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Received: 25 June 1987
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Cite this article:
Xin Zhaoqing Li Zuohao; Zhao Yingying and Xiao Yide(Wuhan Research Institute of Material Protection). ELECTROCHEMICAL BEHAVIOUR OF CORROSION OF CARBIDE-TYPE CHROMIZED LAYER IN SODIUM CHLORIDE SOLUTION. J Chin Soc Corr Pro, 1987, 7(3): 177-188.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1987/V7/I3/177
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