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Effect of Ca2+ on Structure and Corrosion Resistance of Conversion Coating Formed on Cast AZ91D Magnesium Alloys

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Abstract:

Phosphate conversion coatings was investigated on the surface of AZ91D magnesium alloy in a manganese dihydro phosphate baths. The influence of Ca2+ on coating microstructure was evaluate by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) techniques, and the corrosion resistance of the coating was tested by polarization curve methods in 3.5%NaCl. Surface observation results show that the conversion coating presents in crystal feature, and the coating containning Ca was uneven with large grains and small grains. The adding of Ca2+ compound in the bath was found to be important for the attainment of good combination between the coating and Mg alloy substrate. Polarization curve results indicate that the phosphate conversion coating containing Ca could enhance the corrosion potential and improve corrosion resistance.

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Periodical:

Advanced Materials Research (Volumes 887-888)

Pages:

1111-1114

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.1111

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Online since:

February 2014

Authors:

Wan Qiu Zhou*, Shi Wei Wu, Li Sheng, Xin Li

Keywords:

Ca2+, Conversion Coating, Corrosion Resistance, Magnesium Alloy

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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