1、中、低电流密度区的镀层很薄或是无镀层，镀层比较阴暗，无光泽，会有明显的薄雾现象。
1. The coating in the middle and low current density area is very thin or no coating, the coating is relatively dark and lusterless, and there will be obvious mist phenomenon.
2、高电流密度区的镀层容易剥离、脆裂，镀层会发蓝。在赫尔槽实验时，镀层会向外翘起。
2. The coating in the high current density area is easy to peel and embrittlement, and the coating will turn blue. In the hull cell experiment, the coating will rise outwards.
3、镀层会有发黄、发雾、发花的现象，有的镀层是呈片状脱落，外观质量很差。
3. The coating will be yellow, foggy and flowery. Some coatings are flaked and fall off, with poor appearance quality.
4、工件在镀镍后出槽时，有的部位是无水膜的，即工件没有完全润湿。
4. When the workpiece is out of the groove after nickel plating, some parts have no water film, that is, the workpiece is not completely wetted.