Ni-P alloy coating was plated by electroless plating method on Q235 steel surface.Influences of sodium succinate on deposition rate,microstructure and P content of the Ni-P alloy coating were studied,and the optimal sodium succinate concentration in the electroless plating solution was explored.Results showed that when the sodium succinate concentration reached to 18 g/L,the coating quality was the best with continuous and dense deposition layer,flat surface and smaller cellular organization size;with increase of the sodium succinate dosage,the plating rate increased first and then decreased;when the sodium succinate concentration reached to 18 g/L,the plating rate reached to the maximum value of 12.785 μm/h and P mass fraction in the coating was 10.87％.%采用化学镀方法在Q235钢表面施镀Ni-P合金镀层,研究丁二酸钠对Ni-P合金镀层沉积速率、组织和P含量的影响,探究镀液中丁二酸钠的最佳浓度.结果发现,当Ni-P合金镀液中丁二酸钠质量浓度达到18g/L时,镀层连续致密,表面平整,胞状组织尺寸较小,镀层的质量最好;随着丁二酸钠用量的增加,沉积速率呈现先增大后减小的趋势,当丁二酸钠质量浓度达到18 g/L时,沉积速率达到最大值12.785 μm/h;镀层中P的质量分数为10.87％.
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