BL光亮氰化镀铜工艺
1.适用范围及特点
(1)适用于钢铁、锌合金等基体零件的挂镀和滚镀。
(2)在低氰、中氰和高氰镀铜溶液中,在较宽的温度范围内,阴极静止或移动下,不需要使用换相电源均能得到均匀光亮的镀层。
(3)杂质容忍度高,易于控制。
(4)镀层光亮平滑,结晶细致,孔隙率小。
2.镀液配方和操作条件
|
氰化亚铜 |
25~ |
|
温度 |
40~ |
|
氰化钠 |
35~ |
|
DK |
0.5~1. |
|
诺切液 |
30~50mL/L |
|
阴极 |
静止或摆动 |
|
BL-3 |
5~7mL/L |
|
电源 |
直流 |
|
BL-4 |
4~6mL/L |
3.光亮剂作用和补充
诺切液降低阳极钝化,促进阳极溶解。含量为30~50mL/L。
光亮剂BL一3能使高电流密度区光亮,内含表面活性剂,降低镀层出现针孔的机会。
光亮剂BL-4与BL-3配合使用,能得到由高至低电流密度同样光亮的镀层。
表8-10常规故障及纠正方法

补充方法:
①光亮剂宜少量多次补充,正常生产时每班补充2~3次。
②诺切液按带出损失补给,BL-3补充量为l00mL/(kA·h),BL-4补充量为300mL/(kA·h)。
③补充光亮剂后应充分搅拌,使之分散均匀。
4.常规故障及纠正方法(表8-10)
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