预镀的条件每个车间差别很大。
铝是一种难镀的金属，没有适合铝材直接化学镀镍的镀液。
Aluminium is the hard plating metal, there is no plating liquid to aluminium material direct chemical ni - p.
应该承认，在电镀之前，原来的锈没有被清除干净，结果，镀的铬外皮也不牢固，你可以从照片上看出来。
It should be admitted that the rust was not scoured off completely before electroplating. As a result, the chrome coating would certainly not hold. You can see it from the photos.
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