(1)发黑处理。通过一些特殊处理，对不锈钢1Cr13, 3Cr13, 4Cr13作镀锌上电镀黑镍和锌层发黑处理。
    ①镀黑镍溶液成分和土艺条件
    钼酸按[(NH4)6Mo7O24.4H20 ]                                                 30~40 g/L
    硫酸镍(NiS04 .7H2O)                                                                       120~150 g/ L
    硼酸(H3BO4)                                                                                                20~25 g/ L
    pH值                                                                                                                 4.5一5.5
    温度                                                                                                          20一25℃
    阴极电流密度                                                                                       0.15~0.3A/dm2
    时间                                                                                                          15一20min
    ②镀锌层发黑溶液成分及工艺条件
    钼酸按[(NH4)6Mo7O24.4H20 ]                                                          300g/L
    氨水(NH3·H2O)(d=0.89)                                                                  600mL/ L
    温度                                                                                                   30~40℃
    时间                                                                                                            10min
    (2)镀锌-镀黑镍工艺流程。电解除油→水洗→弱腐蚀(硫酸110mL/L，硫脲10g/L,洗洁净适量)→水洗→镀锌[NH4Cl 220~280g/L,ZnCl2 30~35g/L,H3BO3 25~30g/L,聚乙二醇1~2g/L，硫脲1~2g/L，洗涤剂0.5~1mL/L,pH 5.6~6.0，温度10~35℃，阴极电流密度(Dk)1~1.5A/dm2,时间30s]→水洗→退锌(ZnCl2 50g/L,HCl 50mL/L,室温，时间退尽为止)→水洗→弱腐蚀(ZnCl2 50g/L,HCl 50mL/L,室温，时间退尽为止)→水洗→镀锌
(时间5min)→镀黑镍→水洗→封闭处理(CrO3 2.5~5g/L,pH 1.5~5，温度10~30℃, 时间10~20s)→水洗→干燥(低于500℃)
    (3)镀锌发黑处理工艺流程。前处理至镀锌与镀黑镍前工艺流程相同→镀锌(时间1.0~15min )→水洗→锌层发黑→水洗→烘干。