| 1. | The good adhesion of zinc coating can be obtained . 3 . pyrophosphate copper electroplating is conducted by ammonium citrate as a auxiliary complexing agent at around 40 , the narrow range of current density can 3 .焦磷酸盐镀铜时采用柠檬酸铵作为辅助配合剂,温度控制在40左右,电流密度范围较窄,控制在1 . 0a . dm ~ ( - 2 )左右,电镀时间较长,无法达到无孔状态,所以必须采用酸性镀铜加厚铜镀层。 |