摘要
三价铬钝化毒性小,将成为六价铬最有可能被接受的替代品。通过正交试验和单因素试验,得到了三价铬彩色钝化膜的最佳工艺条件为:3.0mL/LCr2(SO4)3·6H2O、5g/L丙二酸、5g/LNaNO3、1g/LNi盐、0.6mL/L有机硅封闭剂,pH值1.6,钝化温度25℃,钝化时间80s。探讨了pH值、钝化温度、钝化时间与封闭剂浓度和耐蚀性的关系。在最佳工艺条件下得到的钝化膜呈彩色,能通过79h中性盐雾试验。
Cr (Ⅲ) passivation will be the most acceptable technique instead of Cr(VI) passivation. Acccording to orthogonal design method and one-way method, the optimal conditions of trivalent chromium passivation was obtained as follows; 3.0 mL/L Cr2 (SO4)3 · 6H2O, 5 g/L malonic acid,5 g/L NaNO3,1 g/L Ni(D) ions,0.6 imVL or-ganosilicon topcoating liquid H, pH = 1. 6, temperature of 25 ℃, and time of 80 s. The correlation among the passivating parameters and the morphology and corrosion resistance of the electroplated zinc coating were explored. IV passivation film obtained under the above conditions has decorative color, and can pass 79 h NSS test.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第10期39-41,共3页
Materials Protection
关键词
镀锌
三价铬
彩色钝化
工艺
zinc plating
Cr(Ⅲ)
colorized passivation
process
