Characterization and electrochemical corrosion properties of Sn and Al + Sn containing coatings on magnesium alloys prepared by laser surface treatment

被引：11

作者：

Wang, L.-Q. ^{[1
,2
]}

Zhou, J.-S. ^{[1
]}

Liang, J. ^{[1
]}

Chen, J.-M. ^{[1
]}

机构：

[1] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences

[2] University of Chinese Academy of Sciences

来源：

Materials and Corrosion | 2014年 / 65卷 / 08期

基金：

中国国家自然科学基金;

关键词：

corrosion resistance; laser surface treatment; magnesium alloy;

D O I：

10.1002/maco.201307092

中图分类号：

学科分类号：

摘要：

Sn and Al + Sn containing coatings were prepared on the surface of AZ91D magnesium alloy by laser surface treatment. The microstructure and composition of specimens were analyzed by metallurgical microscope, scanning electron microscope (SEM), field emission scanning electron microscope (FESEM) equipped with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion resistance of the as-received and laser treated magnesium alloys were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. The effect of Sn and Al + Sn addition on the microstructure, composition and corrosion behavior of magnesium alloys was investigated. Results showed that the surface presents different phase composition. The corrosion resistance of magnesium alloys sharply decreased after laser surface cladding (LSC) of Al + Sn, for the galvanic corrosion between Al and Sn. Conversely, the corrosion resistance was improved by laser surface alloying (LSA) of Sn due to the refinement effect and the protection of Mg2Sn and SnO2 in the grain boundary to the α-Mg matrix. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：820 / 827

页数：7

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