Effects of Al Contents on Microstructure and Corrosion Resistance of Al-Mg<sub>2</sub>Si Composite Coatings

Fan Chun; Long Wei; Zhou Xiaoping

doi:10.15980/j.tzzz.2017.08.029

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Effects of Al Contents on Microstructure and Corrosion Resistance of Al-Mg₂Si Composite Coatings
Vol. 37, Issue 8, Pages: 914-918(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.08.029

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[1]范春,龙威,周小平.Al含量对Al-Mg_2Si复合涂层组织及耐腐蚀性能的影响[J].特种铸造及有色合金,2017,37(08):914-918.

Fan Chun, Long Wei, Zhou Xiaoping. Effects of Al Contents on Microstructure and Corrosion Resistance of Al-Mg₂Si Composite Coatings. [J]. Special Casting & Nonferrous Alloys 37(8):914-918(2017)
[1]范春,龙威,周小平.Al含量对Al-Mg_2Si复合涂层组织及耐腐蚀性能的影响[J].特种铸造及有色合金,2017,37(08):914-918. DOI： 10.15980/j.tzzz.2017.08.029.

Fan Chun, Long Wei, Zhou Xiaoping. Effects of Al Contents on Microstructure and Corrosion Resistance of Al-Mg₂Si Composite Coatings. [J]. Special Casting & Nonferrous Alloys 37(8):914-918(2017) DOI： 10.15980/j.tzzz.2017.08.029.

摘要

在AZ31B镁合金表面制备不同Al含量的Al-Mg

Si复合涂层。用XRD、SEM、EDS分析涂层的物相组成、组织及元素成分;通过电化学试验和浸泡试验测试试样的耐腐蚀性

并测试涂层的显微硬度

研究Al含量对涂层组织及耐腐蚀性能的影响。结果表明

Al含量越高

涂层组织越致密

孔洞和裂纹越少。Al含量为60%时涂层的耐腐蚀性最佳

显微硬度最高

腐蚀电位为-1.363 5V

腐蚀电流密度为0.457 8mA/cm

显微硬度（HV）为300左右。

Abstract

Al-Mg2 Si composite coatings were fabricated on AZ31 Bmagnesium alloy by the flame spraying with Al and Mg

Si mixed powders.The XRD

SEM and EDS were used to analyze the phase composition

microstructure and element distribution of the coating.The potential corrosion and corrosion current density of the sample were investigated by electrochemical experiment

and the corrosion rate of the sample was tested by immersing experiment in the same solution.And then

the micro-hardness was tested.The effect of Al contents on the microstructure and corrosion resistance of the coating was analyzed through above experiments.The results reveal that the relative density of the coating with decrease of cracks and holes is increased with the increase of the content of Al in the coating.The corrosion resistance and micro-hardness of composite coating

where potential corrosion is-1.363 5Vand corrosion current density is 0.457 8 mA/cm

and micro-hardness reaches approximately 300 HV

becomes desirable when content of Al is 60%.