高速电弧喷涂铝基非晶纳米晶复合涂层的组织及性能

采用自动化高速电弧喷涂系统，将自行研制的粉芯丝材在AZ91镁合金基体表面制备出2种Al基非晶纳米晶复合涂层。采用扫描电子显微镜（SEM）观察非晶纳米晶复合涂层横截面的微观形貌，利用XRD对非晶纳米晶复合涂层进行结构分析。结果表明，非晶纳米晶复合涂层是由非晶相和晶化相共同组成，涂层致密，孔隙少。Al-Ni-Y-Co涂层的维氏硬度值为3117.6 MPa， Al-Ni-Mm-Fe涂层的维氏硬度值为3407.2 MPa，约为传统Al-RE涂层的4倍左右，为AZ91镁合金基体的5倍左右。电化学试验结果表明，Al-Ni-Y-Co、Al-Ni-Mm-Fe涂层的耐蚀性优于传统Al-RE涂层和AZ91镁合金基体。

Microstructure and Performance of Al-Based Amorphous and Nanocrystalline Composite Coatings Prepared by High Velocity Arc Spraying

Al-Ni-Y-Co and Al-Ni-Mm-Fe amorphous and nanocrystalline composite coatings were prepared on the surface of AZ91 magnesium alloy by automatic high velocity arc spraying system. The microstructures of the composite coatings were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the composite coatings compose of amorphous phases and crystalline phases. The composite coatings have a compact structure with low porosity. The Vickers microhardness HV of Al-Ni-Y-Co and Al-Ni-Mm-Fe coatings is 3117.6 MPa and 3407.2 MPa, respectively, which is about four times higher than that of the traditional Al-RE coatings and five times higher than that of the AZ91 magnesium alloy. The electrochemistry experimental results show that the corrosion resistances of the Al-Ni-Y-Co and Al-Ni-Mm-Fe amorphous and nanocrystalline composite coatings are superior to those of the traditional Al-RE coatings and AZ91 magnesium alloy.