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采用扫描电镜分析了不同电流密度分配制度下所得无锡钢板表面形貌的差异。结果表明,电流密度逐渐增大的分配制度获取的无锡钢表面存在较多孔隙,且镀层表面粗糙。电流密度平均分配时获取的无锡钢表面尽管同样存在较多孔隙,但是镀层表面较为细腻。电流密度逐渐减小的分配制度获取的无锡钢表面孔隙率和状态均明显改善。电流密度交叉式分配制度获取的无锡钢表面孔隙率少,且铬镀层均匀、细腻。根据3.5%(质量分数)NaCl溶液中的极化曲线和中性盐雾试验分析可知,与其他电流密度分配制度相比,交叉式电流密度分配制度获取的无锡钢耐蚀性较好。建立了不同电流密度分配制度下所得无锡钢在中性盐雾试验中的点蚀产生时间与试验温度的方程。
Scanning electron microscope (SEM) was used to analyze the differences of the surface topography of the obtained Wuxi steel under different current density distribution. The results show that there are more pores on the surface of Wuxi steel obtained by the distribution system with increasing current density, and the surface of the coating is rough. Although the surface of Wuxi steel obtained when the current density is evenly distributed has more pores, the surface of the coating is more delicate. The current density of the distribution system to obtain a gradual reduction of Wuxi steel surface porosity and state were significantly improved. Current density crossed the distribution system to obtain Wuxi steel surface porosity, and chrome plating uniform and delicate. According to the polarization curve of 3.5% (mass fraction) NaCl solution and the analysis of neutral salt spray, the corrosion resistance of Wuxi steel obtained by crossed current density distribution system is better than that of other current density distribution system. The equations of pitting corrosion time and test temperature of the obtained Wuxi steel in the neutral salt spray test under different current density distribution are established.