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ANTICORROSION PROPERTIES OF Zn–Al–Mg–ZnO COMPOSITE COATING PREPARED BY COLD SPRAYING

XINQIANG LU

School of Mechanical Engineering, University of Jinan, Jinan 250022, P. R. China

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SHOUREN WANG

School of Mechanical Engineering, University of Jinan, Jinan 250022, P. R. China

E-mail Address: me_wangsr@ujn.edu.cn

Corresponding author.

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TIANYING XIONG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

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DAOSHENG WEN

School of Mechanical Engineering, University of Jinan, Jinan 250022, P. R. China

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GAOQI WANG

School of Mechanical Engineering, University of Jinan, Jinan 250022, P. R. China

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, and

HAO DU

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

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https://doi.org/10.1142/S0218625X19502111Cited by:2 (Source: Crossref)

Abstract

Two kinds of composite coatings, Zn $_{45}$ Al $_{35}$ Mg₅ZnO $_{15}$ and Zn $_{65}$ Al $_{15}$ Mg₅ZnO $_{15}$ , were prepared on steel matrix (Q235) by cold spraying. The Zn, Al, Mg, and ZnO in raw materials were calculated by percentage of mass. The morphology of the original coating was observed by scanning electron microscopy (SEM) and characterized by energy dispersive spectroscopy (EDS). It was found that the microstructures of Zn $_{45}$ Al $_{35}$ Mg₅ZnO $_{15}$ and Zn $_{65}$ Al $_{15}$ Mg₅ZnO $_{15}$ composite coatings prepared by cold spraying were compact without oxidation products, and the plastic deformation of powder particles was significant. The friction and wear test data of the two coatings showed that the Zn $_{45}$ Al $_{35}$ Mg₅ZnO $_{15}$ coating had longer-lasting protective properties and wear resistance under the same conditions. Neutral salt spray test (NSS) and electrochemical accelerated corrosion test were carried out on samples at different time periods. The results of samples’ corrosion microstructure and electrochemical curves showed that Zn $_{45}$ Al $_{35}$ Mg₅ZnO $_{15}$ and Zn $_{65}$ Al $_{15}$ Mg₅ZnO $_{15}$ have good electrochemical protection performance, and Zn $_{45}$ Al $_{35}$ Mg₅ZnO $_{15}$ coating has better protection effect.

Keywords:

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