采用硫酸盐溶液体系进行三价铬电镀,获得厚度超过30 μm的铬镀层.分别探讨了ρ(Cr3+)、ρ(添加剂)、ρ(H3BO3)、(φ)(络合剂)和pH对镀液覆盖能力和镀速,电镀时间对镀速和镀层厚度的影响.研究了不同热处理温度下镀层的硬度和表面形貌.通过正交实验获得了最佳工艺条件:144 g/L Na2SO4,50 g/L K2SO4,60～80 g/L硼酸,15 g/L Cr3+,10～15 mL/L络合剂,1.0～1.5 g/L添o6加剂,适量66润湿剂,pH = 2.5～3.0,温度40 °C,电流密度为10～20 A/dm2.在此工艺下,获得了半光亮、银白色的铬镀层,硬度为706 HV.通过200°C热处理后,铬镀层的硬度达到最大值,为1 401 HV.但热处理温度升高,铬镀层表面出现裂纹而影响镀层质量.
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