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| Preparation and Corrosion Resistance Performance of Fe-Ni Alloy Coating on Surface of Mild Steel |
| SHENG Minqi1, 2 XU Jifang1, 2* WAN Kang1 LV Chenkai1 |
1. Shagang School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215021
2. Shanghai Key Laboratory of Modern Metallurgy and Material Processing, Shanghai University, Shanghai 200072 |
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Cite this article:
SHENG Minqi, XU Jifang, WAN Kang, LV Chenkai. Preparation and Corrosion Resistance Performance of Fe-Ni Alloy Coating on Surface of Mild Steel. Chinese Journal of Materials Research, 2013, 27(2): 183-188.
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Abstract Fe-Ni alloy coatings were prepared on the surface of mild steel by means of thermal diffusion, using nano-NiO powder as the source of Ni element. The effects of treatment temperature on surface state, structure and corrosion resistance of the Fe-Ni alloy coatings were investigated. The result shows that: when the treatment temperature was higher than 800 ℃, 20-25 μm Fe-Ni alloy coatings formed and Ni content (atomic fraction) were higher than 25% on the surface, the coating and the substrate was integrated to metallurgy structure. When the treatment temperature was higher than 900 ℃, Fe-Ni alloy structure became single α-Fe solid solution phase. The corrosion resistance of Fe-Ni alloy coatings increased with the treatment temperature from 700 to 1000 ℃. In contrast with mild steel in 3.5%NaCl solution, the Fe-Ni alloy coatings have more positive corrosion potential, much lower corrosion current density. The electrochemical impedance of Fe-Ni alloy coatings was also bigger than that of mild steel in 3.5%NaCl solution.
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