采用四点弯曲-声发射方法，对随热处理温度变化的Ni-P(Re)化学镀层及其复合镀层的失效形式(内聚失效、镀层脱粘)、启裂载荷和启裂挠度进行了检测。结果表明，稀土在镀层与底材界面和粒子界面的平衡偏聚，提高了界面强度、启裂载荷、启裂挠度和裂纹扩展抗力。400 ℃以上热处理显著提高了镀层与底材之间界面的结合强度，从而使镀层由镀态时的界面启裂转变为镀层表面的内聚启裂。

The ways of four-point bend test and acoustic emission were used, the failure pattern(cohesive failure,coating debonding) of Ni-P electroless plating and composite plating that varied with the heat treatment temperature were obtained. The results showed that the rear earth's balance deviation between coating and interface of substrate and particles was able to improve the strength of interface,crackle load,crackle deviation and extend strength of crackle. The heat treatment above 400℃ greatly improved adhesive strength between plating and substrate material, thus making coating change from interface crackle to cohesive crackle.