瀏覽次數:117by:wuha
R.G-707 三价铬顿化剂
tisakindofzincpassivationprotectiveprocess,absolutelyexclusiveofhexavalent. Platingfilmiseven
t is a kind of zinc passivation protective process, absolutely exclusive of hexavalent.
Plating film is even black, full gloss to half gloss
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