中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 11 November 2010 |
magnesium alloys
XIANG Yang-hui(向陽(yáng)輝)3, HU Wen-bin(胡文斌)3, DING Wen-jiang(丁文江)3
（1. School of Materials Science and Engineering, University of Shanghai for Science and Technology,
Shanghai 200093, China;
2. School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
3. National Engineering Center of Light Weight Alloy Net Forming, Shanghai Jiao Tong University,
Shanghai 200030, China）
Abstract:The physical characteristics and microstructure of the fluoride film formed during activation were investigated using SEM, XPS and SAM, and its stability in electroless nickel (EN) bath was analyzed. The effects of the fluoride film on EN deposition were studied additionally. The results show that the fluoride film on magnesium alloys is a kind of porous film composed of MgF2 with thickness of 1.6−3.2 μm. The composition of the activation bath and pretreatment of EN processing have influence on the composition of the fluoride film. The fluoride is stable and dissolves little in EN bath; as a result, the fluoride film can protect magnesium substrate from the corrosion of EN bath. The composition of fluoride determines the initial deposition of EN and part of the fluoride film finally exists as inclusion in EN coating.
Key words: magnesium alloys; electroless nickel plating; fluoride film
