因为阴极极化作用超过一定范围，会导致氢气的大量析出，从而使镀层变得多孔、粗糙、疏松、烧焦，甚至是粉末状的，质量反而下降。
Because the cathode polarization effect more than a range, will lead to a large number of hydrogen, and separation coating becomes porous, rough, loose, scorched, even the powder, quality just drop.
以氢气析出造成的微裂纹为主。电镀工艺参数中温度对微裂纹的多少影响很大。
Of the electroplating technology parameters, temperature has a great in - fluence upon the number of microcracks.
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