Al2O3 eliminating defects in the Al coating by laser cladding to improve corrosion and wear resistance of Mg alloy

材料科学 涂层 微观结构 合金 腐蚀 压痕硬度 冶金 复合材料 基质(水族馆) 海洋学 地质学
作者
Sheng Li,Laihua Yi,Liu Tong-fang,Bo Ji,C.C Yang,Lihong Zhou
出处
期刊:Materials and Corrosion-werkstoffe Und Korrosion [Wiley]
卷期号:71 (6): 980-991 被引量:9
标识
DOI:10.1002/maco.201911362
摘要

Abstract Although Al produces a solid metallurgical bonding with Mg alloy substrates, micropores or crevices in the Al coating can reduce the resistance of Mg alloy to corrosion. In this study, a composite coating with a defect‐free microstructure was prepared on the AZ31 Mg alloy substrate by introducing Al 2 O 3 into the Al matrix via the method of laser cladding. On the one hand, Al 2 O 3 with thermal insulation had a low thermal expansion coefficient and was not very prone to voids during laser melting. On the other hand, Al 2 O 3 particles with a small size acted as the filler in the micropores or crevices. The Al/Al 2 O 3 coating exhibited a smaller current density (2.1 × 10 −6 A/cm 2 ) in comparison with those of bare substrate and Al coating (158.4 × 10 −6 and 3.1 × 10 −6 A/cm 2 , respectively), which was mainly ascribed to the pore‐free microstructure and high resistance to corrosion of Al 2 O 3 phase. A favorable microhardness value of 95.3 HV was achieved for Al/Al 2 O 3 coating, approximately 1.8 times higher than that of Al coating (52.8 V), which was mainly ascribed to the dispersion hardening of Al 2 O 3 phase. Meanwhile, the Al/Al 2 O 3 coating significantly reduced wear volume from 2.8 mm 3 /m of Al coating to 0.4 mm 3 /m, showing great potential for weight reduction applications.
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