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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3117.6MPa,Al-Ni-Mm-Fe涂层的维氏硬度值为3407.2MPa,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。
An automatic high-speed arc spraying system was used to prepare two kinds of Al-based amorphous nanocrystalline composite coatings on the surface of AZ91 magnesium alloy by self-developed cored wire. The morphology of the cross section of the amorphous nanocrystalline composite coating was observed by scanning electron microscope (SEM), and the structure of the amorphous nanocrystalline composite coating was analyzed by XRD. The results show that the amorphous nanocrystalline composite coating is composed of amorphous phase and crystallization phase. The coating is compact with few pores. Al-Ni-Y-Co coating Vickers hardness value of 3117.6MPa, Al-Ni-Mm-Fe coating Vickers hardness value of 3407.2MPa, about the traditional Al-RE coating of about 4 times as AZ91 magnesium alloy substrate about 5 times. The results of electrochemical tests show that the corrosion resistance of Al-Ni-Y-Co and Al-Ni-Mm-Fe coating is better than that of Al-RE coating and AZ91 magnesium alloy.