超音速电弧喷涂FeCrNi复合涂层的微观结构与性能

Microstructure and properties of FeCrNi composite coating sprayed by high velocity arc

采用超音速电弧喷涂(HV-ARC)技术在Q235钢表面制备FeCrNi复合涂层,通过扫描电镜(SEM)、X射线衍射仪(XRD)、光学显微镜、显微硬度计、摩擦磨损试验机、电化学工作站等手段研究了涂层的微观结构及性能。结果表明:超音速电弧的高能量、高粒子速度使得涂层具有极低的孔隙率,较高的结合强度;涂层中存在Cr、Ni的氧化相,这些氧化相对涂层的硬度及耐磨性能有着显著影响;超音速电弧FeCrNi复合涂层的耐磨性能较普通电弧涂层提高40%以上,较基体Q235钢提高4.5倍以上,耐腐蚀性能也有了大幅的提高。

FeCrNi composite coatings were prepared on Q235 steel surface by HV-ARC.The microstructure and properties of the coatings were investigated by means of scanning electron microscopy（SEM）,X-ray diffraction（XRD）,metallurgic microscope,hardness test,wear testing machine and electrochemical workstation.The results show that the coatings sprayed by high energy and high particle velocity have low porosity and high binding strength.There are oxide phases of Cr and Ni in the coatings which have a significant effect on hardness and wear-resistance of the coatings.The wear-resistance of HV-ARC FeCrNi composite coatings is more than 40% compared with ordinary arc coating,and more than 4.5 times that of the Q235 steel,its corrosion resistance is also improved significantly.