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采用自动化高速电弧喷涂系统,用自行研制的粉芯丝材,在AZ91镁合金基体表面上制备出Al-Ni-Y-Co非晶纳米晶复合涂层.采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)分析了Al-Ni-Y-Co非晶纳米晶复合涂层的微观形貌和组织结构,结果表明Al-Ni-Y-Co非晶纳米晶复合涂层是由非晶相和纳米晶化相共同组成的,涂层结构致密,孔隙率约为1.8%.Al-Ni-Y-Co非晶纳米晶复合涂层的平均显微Vickers硬度值为311.7 HV0 1,结合强度为26.8 MPa.涂层的抗磨损耐腐蚀性能优于Al涂层和AZ91镁合金基体;其相对耐磨性约为Al涂层的10倍,为AZ91镁合金的6倍;其自腐蚀电位值正于Al涂层及AZ91镁合金,自腐蚀电流密度值约为Al涂层的1/2,AZ91镁合金的1/5;其腐蚀后的表面形貌比Al涂层和AZ91镁合金平整,点蚀较少.Al-Ni-Y-Co非晶纳米晶复合涂层的耐磨防腐综合性能优异.
Al-Ni-Y-Co amorphous nanocrystalline composite coatings were prepared on the surface of AZ91 magnesium alloy by self-developed high-speed arc spraying system using self-developed cored wire. Scanning electron microscopy (SEM), X-ray The microstructure and microstructure of Al-Ni-Y-Co amorphous nanocrystalline composite coatings were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the Al-Ni- The coating is composed of an amorphous phase and a nanocrystallization phase, and the coating has a compact structure with a porosity of about 1.8%. The average micro Vickers hardness of the Al-Ni-Y-Co amorphous nanocrystalline composite coating is 311.7 HV0 1, the bonding strength is 26.8 MPa. The wear resistance and corrosion resistance of the coating are better than those of Al coating and AZ91 magnesium alloy. The relative wear resistance is about 10 times that of Al coating and about 6 times that of AZ91 magnesium alloy ; Its self-corrosion potential value is positive with Al coating and AZ91 magnesium alloy, the self-corrosion current density is about 1/2 of that of Al coating and 1/5 of that of AZ91 magnesium alloy; the surface morphology after corrosion is higher than that of Al coating And AZ91 magnesium alloy formation, less pitting .Al-Ni-Y-Co amorphous nanocrystalline composite coating excellent wear resistance and corrosion resistance.