Effect of Mg on the Microstructure and Electrochemical Corrosion Behavior of Arced Sprayed Zn-Al Coating

Zi Xin Zhu; Yan Liu; Bin Shi Xu

doi:10.4028/www.scientific.net/AMR.154-155.1389

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 154-155Effect of Mg on the Microstructure and...

Effect of Mg on the Microstructure and Electrochemical Corrosion Behavior of Arced Sprayed Zn-Al Coating

Abstract:

Cored wires and high velocity arc spraying technique (HVAS) were used to produce high Mg content Zn-Al-Mg alloy coatings on low carbon steel substrates. The microstructures, mechanical properties and electrochemical corrosion behaviors of the Zn-Al-Mg coatings were investigated comparing with Zn and Zn-Al alloy coatings. And the electrochemical corrosion mechanisms of the coatings were discussed. The coatings show a typical aspect of layered thermal sprayed material structure. Chemical analysis of the coating indicated the composition to be Zn-14.9Al-5.9Mg-3.0O (wt.%). The main phases in the coatings are Zn, Mg2Zn11, Al12Mg17 and MgAl2O4, together with a little Al2O3 and ZnO. The corrosion potential of Zn-Al and Zn-Al-Mg coatings decreased a little and then increased towards the noble potential. With addition of Mg, the corrosion products accumulated to form stable passive film can block off the pores in the Zn-Al-Mg coating, and thus may prevent attack on the underlying steel substrate. The Zn-Al-Mg coatings show higher electrochemical corrosion resistance in salt solution than Zn-Al coatings.

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Periodical:

Advanced Materials Research (Volumes 154-155)

Pages:

1389-1392

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.154-155.1389

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Online since:

October 2010

Authors:

Zi Xin Zhu, Yan Liu, Bin Shi Xu

Keywords:

Arc Spraying, Electrochemical Corrosion, Microstructure, Potentiodynamic Polarization, Zn-Al Coating, Zn-Al-Mg Coating

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