热处理对Ni-P化学镀层阻垢和耐蚀性能的影响

Effect of Heat Treatment on Anti-fouling Performance and Corrosion Resistance of Ni-P Electroless Plated Coating

利用XRD研究了化学镀Ni-P合金镀层经不同温度热处理后的结构变化。结果表明,镀态Ni-P呈非晶态;350℃时镀层由非晶态向晶态转化;热处理温度为400℃时,析出Ni3P稳定相。镀态及热处理条件下的阻垢和耐蚀性实验结果表明,随着热处理温度的升高,CaCO3中Ca的原子分数先降低后升高,300℃热处理降低了镀层的内应力及氢脆,使镀层的组织更加致密,镀层的阻垢和耐蚀性得到改善。

The effect of heat treatment temperature on the microstructural evolution of electroless plated Ni-P coatings was investigated using X-ray diffraction （XRD） analysis. The results showed that the as plated electroless Ni-P coating is amorphous. After heat treatment at 350 ℃, Ni-P coat- ings turn into crystalline state, while Ni3P phase appeared at 400 ℃. With the increasing heat treat- ment temperature, the Ca^2 ＋ atomic percentage of the formed fouling scales reduced firstly at 300℃, and then increased at 350 and 400℃. After heat treatment at 300℃, the internal stress and hydrogen embrittleness of the coating was eliminated, thereby, the anti-fouling performance and corrosion resistance of the coating was enhanced.