摘要
铸铁管件在5%HF 和15%HCl 的溶液中酸洗6 min,再在5～10%H_2SO_4与5～7%HF 中活化5～15 s,然后在中性铵盐镀液中滚镀及镀后处理。镀液稳定,分散能力和覆盖能力均较好,内壁全部镀上锌,经盐雾试验3周期,不泛白点,达到部颁标准。镀层结合力好,光亮度好。
Cast iron pipe with id of 12.7mm and length of 150mm is dipped in a solution of HF 5% and HCI 15% for 6 min,activated in a mixture of H_2SO_4 5-10% and HF 5-7% for 5-15 s,barrel plated in neutral ammonium salt solution and then post-treated.Plating bath consists of NH_4Cl 220-280, ZnCl_2 20-35,urotropine 5-10,peregal 5-8 and benzal acetone 0.1-0.2g/L,working at pH 6.2-6.7, 0.8-1.5A/dm^2 and 15-30℃.It is stable and good in throwing and covering powers with inner wall fully Zn covered without any white spot after 3 cycles of salt spray.Deposit is also good in adhesion and brightness.(p.7-8)
出处
《电镀与环保》
CAS
CSCD
1993年第2期7-8,共2页
Electroplating & Pollution Control
