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采用三价铬硫酸盐体系在普通碳素钢基体上电镀Fe-Ni-Cr合金镀层,通过浸泡失重法研究不同工艺条件下制备的镀层在3.5%NaCl溶液中的耐蚀性能,并用电化学分析方法研究了镀层试样的耐蚀机理.结果表明,最佳电镀Fe-Ni-Cr合金工艺为:主盐浓度FeSO_4·7H_2O 15 g/L、NiSO_4·6H_2O 8 g/L、Cr(SO_4)_3·6H_2O 200g/L;络合剂柠檬酸浓度70 g/L;电流密度为4 A/dm~2,电镀温度为55℃.该工艺制备的Fe-Ni-Cr合金镀层在3.5%NaCl溶液中的腐蚀速率为73.2 mg·m.h,耐蚀性比基体提高23.3%.
The corrosion resistance of the coating prepared under different process conditions in 3.5% NaCl solution was studied by immersion weight loss method by electroplating Fe-Ni-Cr alloy on common carbon steel substrate by using trivalent chromium sulfate system. The results show that the optimum conditions of Fe-Ni-Cr alloy plating are as follows: the concentration of FeSO 4 · 7H 2 O 15 g / L, NiSO 4 · 6H 2 O 8 g / L and Cr (SO 4) _3 · 6H_2O 200g / L, complexing agent citric acid concentration of 70 g / L, current density of 4 A / dm ~ 2 and electroplating temperature of 55 ° C. The Fe-Ni-Cr alloy coating prepared in this process was immersed in 3.5% NaCl solution In the corrosion rate of 73.2 mg · mh, corrosion resistance than the matrix increased by 23.3%.