CAJ | 학술논문

为提高镁合金表面的耐蚀性,采用热喷涂技术在AZ31镁合金表面制备铝涂层,并利用脉冲钨极氩弧表面熔覆的方法进行表面重熔,获得富铝的合金化层,分析了合金化层的组织结构和性能.研究结果表明:在AZ31镁合金表面的铝合金化层中存在典型的树枝晶结构,含有金属间化合物Mg_2Al_3,Mg_(17)Al_(12)以及α-Mg和Al固溶体.显微硬度测试表明,铝合金化可使AZ31镁合金表面硬度由HV50左右提高到HV200左右.极化曲线测试表明,合金化层提高了镁合金表面的耐蚀性.
위제고미합금표면적내식성,채용열분도기술재AZ31미합금표면제비려도층,병이용맥충오겁아호표면용복적방법진행표면중용,획득부려적합금화층,분석료합금화층적조직결구화성능.연구결과표명:재AZ31미합금표면적려합금화층중존재전형적수지정결구,함유금속간화합물Mg_2Al_3,Mg_(17)Al_(12)이급α-Mg화Al고용체.현미경도측시표명,려합금화가사AZ31미합금표면경도유HV50좌우제고도HV200좌우.겁화곡선측시표명,합금화층제고료미합금표면적내식성.
In order to improve surface properties of magnesium alloy, Al coating on the AZ31 magnesium alloy was prepared by the thermal spraying, and the Al-rich layer was obtained by pulse current gas tungsten arc melting. The microstructure and properties of the alloying layer were analyzed. The results show that the alloying layer has a typical dendritic structure, the alloying layer consistes of phases of Mg_2Al_3, Mg_(17)Al_(12), α-Mg and Al. The microhardness is increased from about HV50 to about HV200. The potentiodynamic polarization results confirmed that the corrosion resistance is enhanced.