(1. 华南理工大学 材料科学与工程学院，广州 510641；
2. 佛山科学技术学院 理学院，佛山 528000；
3. 兴发集团 广东省有色金属加工重点工程技术研究中心，佛山 528061)
摘 要:
关键字: 铝合金；转化膜；无铬；稀土
（1. College of Material Science and Engineering, South China University of Technology, Guangzhou 510641, China;
2. School of Science, Foshan University, Foshan 528000, China;
3. Key Engineering Research Center of Guangdong Province for Nonferrous Metals Processing, Xinfa Group, Foshan 528061, China）
Abstract:An orthogonal experiment was conducted to optimize the solution formula to form a chrome-free chemical conversion coating on aluminium surface. The anti-corrosion of the coating was evaluated with dropping test, potentiodynamic polarization curve and EIS. The surface hardness was determined with micro-hardness tester, and the micro-morphology, element composition of the coating were analysed with SEM and EDS, respectively. The results show that the addition of accelerators to the treating bath will accelerate the coating formation, and the added ammonium salt and chloride will change the Ce content in the coating from 5.93% to 4.15% and 9.27%, respectively. The added accelerators of ammonium salt and chloride could also increase the coating anti-corrosion performance to 2.6 times and 6.6 times against that treated without accelerator, respectively, and increases the micro-hardness of the Al surface from HV68.8 to HV389 and HV450, respectively.
Key words: aluminum alloy; conversion coatings; chrome-free; rare earth
