高硅铝铸件电镀前浸锌工艺研究  

A NEW ZINKING PROCESS WITHOUT CYANIDE FOR Al-Si ALLOY CAST

作　　者：黄晓梅 蒋丽敏[1] 李宁[1] 黎德育[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《腐蚀科学与防护技术》2006年第2期107-111,共5页Corrosion Science and Protection Technology

摘　　要：研究了一种无氰的高硅铝铸件的浸锌新工艺.通过扫描电子显微镜观察了不同浸锌时间和温度的锌合金层的表面形貌,并对锌合金层的质量及镀层结合力进行了评价和测试.通过正交试验,得到较好的浸锌工艺:浸锌溶液为90 g/L氢氧化钠,9 g/L氧化锌,35 g/L硫酸镍,90 g/L无氰络合剂A,6 g/L混合添加剂B,浸锌温度25℃,浸锌时间第一次60 s,第二次30 s.所得的锌合金层结构致密、均匀、颗粒细小、结合力高.A new non-cyanide zinking process for high-Si aluminum cast has been studied in this paper. The variation of surface morphology of zinc coating with zinking time and temperature was observed using scanning electron microscopy （SEM）. The quality and adhesion of the zinc coating were evaluated. Relied on quadrature test, a better zinking process has been developed. The optimal processing conditions were that the bath consisted with of which the optimum 90 g/L sodium hydroxide, 9 g/L zinc oxide, 35 g/L Nickel sulfate, 90 g/L non-cyanide chelating agents and 6 g/L mixed additive B, the bath temperature is 25℃, and finaly the zinking is a two step process with a first step for 60 s and a second step for 30 s. The zinc coating obtained with the above process was dense and uniform with fine crystallines and high adhesion.

关 键 词：高硅铝铸件 浸锌 前处理 结合力 正交试验 

分 类 号：TQ153[化学工程—电化学工业]