中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 19 No. 2 April 2009 |
HE Xiao-mei(何曉梅)3, ZHANG Jun(張 俊)1, YE Li-yuan(葉立元)1
（1. State Key Laboratory of Chemo/Bisensing and Chemometrics, College of Chemistry and Chemical Engineering,
Hunan University, Changsha 410082, China;
2. Department of Chemistry and Chemical Engineering, Huaihua College, Huaihua 418000, China;
3. Department of Chemistry and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China）
Abstract: A one-step pickling-activation process was proposed as an environmental friendly pretreatment method in phosphate-permanganate solution before electroplating on magnesium alloys. The effects of pickling-activation on qualities of coating were assessed by adhesion and porosity testing of copper plating. The interfacial reactions between specimen and solution were analyzed with SEM, EDX and XRD. The results show that the developed process of pickling-activation can equalize the potentials on substrate surface. The compacted zinc film can be obtained by zinc immersion after treating magnesium alloy in the pH 4−6 phosphate-permanganate solution for 3−5 min. The adhesion and corrosion resistance of copper plating are enhanced. The one-step pickling-activation can replace the existing two-step process of acid pickling and activation which contains a great deal of chromium and fluorine. The procedure of surface pretreatment is simplified and the production environment is improved.
Key words: magnesium alloy; pickling-activation; pretreatment; electroplating; corrosion resistance
