No bubbling, corrugation, abscission and cracking are found through bending and filing tests on the composite coatings, so the bonding state is very well between the coatings and the substrate.

• 对复合镀层进行锉削及弯曲试验，表面未见鼓泡、起皮、脱落及裂痕等，表明镀层与基体结合状况良好。