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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 974Effect of Alkaline Phosphate-Permanganate...

Effect of Alkaline Phosphate-Permanganate Conversion Coating on the Corrosion Resistance of AZ91D Magnesium Alloy

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Abstract:

Alkaline phosphate-permanganate conversion coating, chrome-free conversion coating was studied for corrosion resistance of AZ91D magnesium alloy. Also, conventional acid phosphate -permanganate conversion coating was studied for comparison. Analysis and morphology observation for conversion coating layers was investigated in details by using SEM-EDS, XRD. SEM observation showed that a lot of cracks in surface and interface between conversion coating layer and AZ91D magnesium alloy substrate was observed in acid conversion coating, whereas cracks was not almost observed in alkaline conversion coating layer. SEM-EDS and XRD analysis showed that the main elements of both alkaline and acid conversion coating were Mg, O, K, P and Mn. It was found that both conversion coating layers was consisted of MgO, Mg (OH)₂ and MnO₂. Salt spray test showed that the alkaline conversion coating have a good corrosion resistance compared with acid conversion coating.

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Material and Manufacturing Technology V

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Periodical:

Advanced Materials Research (Volume 974)

Pages:

43-49

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.974.43

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Online since:

June 2014

Authors:

Young Min Byoun*, Jin Hwan Jeong, Jong Kyu Park, Sun Kyo Seo, Chi Hwan Lee

Keywords:

Alkaline Phosphate-Permanganate, AZ91D Magnesium Alloy, Chrome-Free Conversion Coating Treatment, Conversion Coating, Corrosion Resistance

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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