铝合金微弧氧化陶瓷膜表面复合化学镀 Ni-P-SiC 的研究

采用复合化学镀方法在铝合金微弧氧化陶瓷膜表面制备了Ni-P-SiC复合镀层,研究了镀液中SiC浓度对复合镀层物相、显微组织、沉积速率的影响,并测试了复合涂层(陶瓷膜/复合镀层)的结合力。结果表明:Ni-P-SiC复合镀层为非晶态结构,与陶瓷膜的界面清晰,完全封闭了微弧氧化陶瓷膜表面的微孔;随着镀液中SiC含量的增加,复合镀层沉积速率降低,SiC共析量则是先快速增大,当含量达到16 g/L后就基本保持不变。

Investigation on Electroless Ni-P-SiC Composite Plating on Micro-arc Oxidation Film of Aluminium Alloy

Ni-P-SiC composite plating was prepared on micro-arc oxidation film of aluminium alloy by electroless composite plating. The effect of SiC concentration in the solution on phase, microstructure and deposition rate was investigated. The adhesion of composite coating ( micro-arc oxidation film and Ni-P-SiC composite plating) was also tested. The results show that the structure of Ni-P-SiC composite plating are amorphous. The interface between composite plating and ceramic film is distinct . Ni-P-SiC composite plating could cover the micropore of micro-arc oxidation film. The deposition rate of Ni-P-SiC composite plating is reduced as the concentration of SiC in the solution increasing. The amount of eutectoid SiC increases quickly with SiC concentration in the solution increased and remains unchanged while the concentration of SiC reaching 16 g / L.