Tribocorrosion of Al-80Mg<sub>3</sub>Sb<sub>2</sub> Composite Coating on AZ31B Magnesium Alloy

Han Tingting; Long Wei; Zhou Xiaoping

doi:10.15980/j.tzzz.2017.12.026

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Tribocorrosion of Al-80Mg₃Sb₂ Composite Coating on AZ31B Magnesium Alloy
Vol. 37, Issue 12, Pages: 1370-1373(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.12.026

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[1]韩婷婷,龙威,周小平.AZ31B镁合金表面Al-80Mg_3Sb_2涂层的腐蚀磨损性能[J].特种铸造及有色合金,2017,37(12):1370-1373.

Han Tingting, Long Wei, Zhou Xiaoping. Tribocorrosion of Al-80Mg₃Sb₂ Composite Coating on AZ31B Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 37(12):1370-1373(2017)
[1]韩婷婷,龙威,周小平.AZ31B镁合金表面Al-80Mg_3Sb_2涂层的腐蚀磨损性能[J].特种铸造及有色合金,2017,37(12):1370-1373. DOI： 10.15980/j.tzzz.2017.12.026.

Han Tingting, Long Wei, Zhou Xiaoping. Tribocorrosion of Al-80Mg₃Sb₂ Composite Coating on AZ31B Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 37(12):1370-1373(2017) DOI： 10.15980/j.tzzz.2017.12.026.

摘要

采用热喷涂技术

在AZ31B表面制备Al-80Mg

复相涂层。采用XRD、SEM、电化学工作站和电化学腐蚀磨损试验仪对涂层进行物相、微观组织、极化曲线和腐蚀磨损性能的测试。结果表明

涂层主要物相为Mg

和Al

组织均匀

自腐蚀电位为-0.98V

自腐蚀电流密度为0.048×10

-3

A/cm

;磨损腐蚀时

AZ31B的开路电位始终为一条直线;而涂层开路电位则是加载后下降

卸载后上升;在往复磨损的一个周期内（约0.008s）

AZ31B和涂层的开路电位都呈微"W"形;涂层的平均摩擦因数（0.10）小于AZ31B的（0.14）。

Abstract

Al-80Mg

composite coating was prepared on the surface of magnesium alloy AZ31Bby thermal spraying.XRD

electro-chemical experiment and SEM

electrochemical corrosion tribometer were employed to analyze the phase composition

microstructure

polarization curves and corrosion resistance under abrasion condition of the coating.The results reveal that the main phases are composed of Al and Mg

with uniform distribution in the coating.The free corrosion potential of the coating is-0.98V

and the free corrosion current density reaches 0.048×10

-3

A/cm

.In tribocorrosion test

the open circuit potential of AZ31B keeps always constant

however

the open circuit potential of coating is decreased with loading then increased with unloading.The open circuit potential of AZ31B and coating presents micro"W"shape in a reciprocating wear period（about 0.008s）.In addition

the average frictional coefficient of the AZ31B and coating reaches about 0.10and about 0.14

respectively.