原位磷化有机涂层技术是将金属磷化处理和有机涂层的涂覆结合起来，在一道工序中完成以前多道涂装工序的任务。在原位磷化液中添加不同的稀土（Re）氯化物，制成磷化有机涂层。通过极化曲线和电化学阻抗测试，结果表明，稀土作为磷化促进剂，稳定性好，能提高磷化的效率和质量，原位磷化有机涂层有效地提高了6061铝合金在3．5％NaCl溶液中的耐蚀性能，且添加0．2％（质量比）LaCl3制备的原位磷化有机涂层的性能最佳，对铝合金基体具有较好的防护效果。全浸泡试验结果显示，加入稀土氯化物增强了原位磷化有机涂层与铝合金基体的结合力。%In situ phosphatizing of organic coatings is a one-step self-phosphating process, in which the formation of metal phosphate layer on the substrate surface and the curing of organic paint film take place simultaneously instead of multi-step process. In this study, different rare earth(Re) chlorides were incorporated into in situ phosphatizing solution and organic coatings were prepared. Polarization curves and electrochemical impedance spectroscopy (EIS) were used to characterize the characteristics of organic coatings. The results indicate that the rare earth which has good stability as a phosphating accelerator can improve the efficiency and quality of phosphate. In situ phosphatizing organic coatings prepared by incorporating rare earth chloride can improve the corrosion resistance of 6061 aluminum alloy in 3. 5 % NaCl solution effectively. When 0. 2 % (mass ratio) LaCl3 was addied to in situ phosphatizing solution, in situ phosphatizing organic coatings had the best performance and a good protection for aluminum alloy substrate. Salt-water immersion test results indicated that the bond between in situ phosphatizing organic coatings and aluminum alloy substrate was enhanced by incorporating rare earth chloride.
展开▼
