超声波冲击法对微弧火花沉积涂层性能的影响

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

在相同条件、机制下制备微弧火花沉积试样,在超声波冲击处理前后,对试样采用拉伸试验、显微硬度检测、残余应力检测、X光检测、耐蚀性试验和显微组织观察等试验方法开展了对比分析,研究了超声波冲击处理对微弧火花沉积涂层性能的影响。结果表明,对微弧火花沉积涂层进行超声波冲击,能够减少层间孔隙、疏松、未熔合等缺陷,致密沉积涂层,提高沉积涂层抗拉强度,可有效改善沉积表面强化层的应力分布,使表面呈现压应力状态。选择耐腐蚀性能较强的沉积材料修复飞机零件表面局部损伤、腐蚀缺陷,并进行超声波冲击将能大大提高飞机零件抗腐蚀能力。

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.