热处理对铝合金表面化学镀镍镀层性能影响

Effect of Heat Treatment on Properties of Electroless Nickel Coating of Aluminium Alloy

针对铝合金表面化学镀镍层结合力和耐蚀性差的问题,采用热处理方法提高镀层结合力和耐蚀性。高低温试验后用划痕法检测结合力强度,运用盐雾试验检测耐蚀性。通过对比试验和结果分析表明:热处理温度和时间对镀层性能存在交互作用;经过150℃、1.5h热处理,镀层与基体结合力最好,80h高、低温试验(高温105℃,低温-55℃)后,镀层结合力强度为48.7MPa;镀层经过150℃、1h热处理,镀层耐蚀性最好,96h盐雾试验后,外观无白斑、起泡、脱皮等腐蚀现象。

For electroless nickel coating on aluminium alloy has poor adhesion and corrosion resistance, heat treatment is adopted to improve adhesion and corrosion resistance in this paper. After high and low temperature testing, adhesion strength of coating is measured by scratch method, and corrosion resistance is checked by neutral salt spray. By comparative experiments and results analysis, it show that the effects of heat treatment temperature and time on the coating properties interact with each other.The coating had the best adhesion after heat treatment with 150℃ and 1.5h and the adhesion strength was 48.7MPa after 80h high （105℃） and low （-55℃） temperature test. The coating had the best corrosion resistance after heat treatment with 150℃ and lh, and the coating has no while spot, blister and peeling after neutral salt spray with 96h.