摘要
由于锌基压铸件表面缺陷多,致密结晶层薄,建议在其上直接低铬彩色钝化,工艺包括;1)采用低碱性混和清洗液除油和三步法去锈,以获得干净光亮表面,同时防止过腐蚀;2)浸入合适的低铬钝化液中钝化。所得钝化膜彩色鲜艳,与镀锌钝化膜相比,具有优良的抗工业性大气腐蚀性能。
Due to the plentiful surface defects and the densely crystallized microstructure layer being thin on zinc based die castings, it is advised that the process for their direct low chromate passivation should comprise: (1)getting bright and clean surface without over-corrosion by means of degreasing in mixed low alkaline solution and descaling by the three-step method , (2) passivating in appropriate low chromate solution.The resulting passivation film is highly iridescent and has better corrosion resistance in industrial atmosphere than the one on zinc coating.
出处
《电镀与精饰》
CAS
1994年第6期11-14,共4页
Plating & Finishing
关键词
锌基
压铸件
钝化
耐腐蚀
工艺
zinc based die castings,low chromate passivation,corrosion resistance,color-ed film
