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Corrosion Behavior of Phosphate Conversion Coating on AZ31 Mg Alloy in 3.5% NaCl Solution

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Abstract:

A duplex-layered phosphate conversion coating was obtained on AZ31Mg alloy through a phosphate bath with citric. Morphology, composition and corrosion behavior of the coating immersed into 3.5% NaCl solution for various time were investigated using scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electrochemical method. The results show that the coating is completely degraded after immersed in NaCl solution for 48h. The corrosion mediums mainly peel coating through the cracks among particles. The phosphate coating is damaged and falls out primarily, then the intermediate layer is degraded, and the substrate happens to dissolve with increasing of immersion time.

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Periodical:

Advanced Materials Research (Volume 910)

Pages:

27-30

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.910.27

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Online since:

March 2014

Authors:

Xue Jun Cui*, Chun Hai Liu, Rui Song Yang, Ming Tian Li, Xiu Zhou Lin

Keywords:

Corrosion Behavior, Magnesium Alloy, Phosphate Conversion Coating

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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