Effect of RE on Microstructure and Electrochemical Corrosion Behavior of Arc Sprayed Zn-Al-Mg Coating

Zi Xin Zhu; Dong Chen; Bin Shi Xu

doi:10.4028/www.scientific.net/AMM.66-68.727

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Effect of RE on Microstructure and Electrochemical...

Effect of RE on Microstructure and Electrochemical Corrosion Behavior of Arc Sprayed Zn-Al-Mg Coating

Abstract:

Cored wires and arc spraying technique were used to produce Zn-Al-Mg-RE alloy coatings on low carbon steel substrates. The effect of RE (where RE is Rare Earth) on the microstructure and electrochemical corrosion behavior of coatings was investigated comparing with Zn-Al-Mg coatings. With addition of RE, the Zn-Al-Mg-RE coating has denser microstructure and fewer porosity. But RE has no discernible effect on the adhesion strength between coating and substrate. The Zn-Al-Mg-RE coating has superior corrosion resistance compared to Zn-Al-Mg coating due to the formation of more compact and uniform corrosion products. The role of the RE elements appears to be associated with the self-sealing process and the refinement of the coating microstructure.

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Periodical:

Applied Mechanics and Materials (Volumes 66-68)

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727-730

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.66-68.727

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Online since:

July 2011

Authors:

Zi Xin Zhu, Dong Chen, Bin Shi Xu

Keywords:

Arc Spraying, Electrochemical Corrosion, Microstructure, Rare Earth (RE), Self-Sealing, Zn-Al-Mg Coating

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