Effect of ultrasonic impact method on performance of micro-arc spark deposited coating

Micro-arc spark deposited samples were prepared under the same conditions and mechanism. Before and after ultrasonic impact treatment, experimental methods such as tensile test, microhardness test, residual stress test, X-ray test, corrosion resistance test and microstructure observation test, were carried out on these samples to study the effect of ultrasonic impact treatment on the performance of micro-arc spark deposited coatings by comparative analysis. The result showed that by ultrasonic impacting on the micro-arc spark deposited coating, defects such as porosity, loose, and incomplete fusion could be reduced so as to densify the deposited coating and improve its tensile strength,which could effectively improve the stress distribution of the surface strengthened layer and make the surface appear in a state of compressive stress. Choosing deposition materials with stronger corrosion resistance to repair local damage and corrosion defects on the surface of aircraft parts and performing ultrasonic impact treatment would greatly improve corrosion resistance of aircraft parts.