摘要
一定量的醋酸可使Ce3+-MnO4-无铬钝化液的pH较长时间维持在2.2左右,同时不降低成膜质量。硼酸浓度为3.0 mmol/L时,可维持钝化液在近一个月内不析出沉淀。将两者以n(醋酸):n(硼酸)=1:26混合加入时,钝化液的稳定性大幅提高。
The pH of chromium-free Ce3＋-MnO4- passivation solution can be maintained at about 2.2 for a long time by using acetic acid without reducing the film quality.No precipitate will come out from the solution within about a month when the concentration of boric acid is 3.0 mmol/L.The stability of the passivation solution is greatly improved when the molar ratio of CH3COOH to H3BO3 is 1：26.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2010年第12期38-40,共3页
Electroplating & Finishing
基金
粤港关键领域重点突破项目(2008Z012)
广东省中大科技专项(产业共性技术)基金(2009A08025002)
关键词
铝合金
无铬钝化液
醋酸
硼酸
稳定性
aluminum alloy
chrome-free passivation solution
acetic acid
boric acid
stability
