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Environmental Friendly Conversion Coating Formed on Magnesium Alloys and its Anti-Corrosion Performance

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Abstract:

Conversion coatings on cast AZ91D magnesium alloy were prepared in the manganese dihydro phosphate baths. The corrosion behavior of the coated and uncoated alloys has been investigated by polarization curve methods. The morphology and composition of coated surfaces were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX ) as well as X-ray photoelectron spectroscopy (XPS) techniques. It is found that the conversion coating surface characterized by crystal particle and was composed of Mn3(PO4)2. Electrochemical investigation results indicated that the phosphate conversion coating could enhance the corrosion potential in great extent of about 1300mV compared with Mg alloy substrate.

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Periodical:

Applied Mechanics and Materials (Volume 525)

Pages:

11-14

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.525.11

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Online since:

February 2014

Authors:

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

Keywords:

Conversion Coating, Corrosion Resistance, Environmental Material, Magnesium Alloy

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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