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HomeMaterials Science ForumMaterials Science Forum Vol. 898Ceria Coatings Prepared by Sol-Gel Approach on...

Ceria Coatings Prepared by Sol-Gel Approach on AZ91 Magnesium Alloy

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Abstract:

The ceria coatings on AZ91 substrates were successfully synthesized by chemical conversion and the corrosion resistance of AZ91 samples with and without ceria coatings were evaluated by means of electrochemical corrosion in 3.5 wt.% NaCl solution. According to the parameters derived from the polarization date, the I_corr (the corrosion current density) values of the coated samples are smaller than that of bare one, indicating that the corrosion resistance of AZ91 alloys has been improved to some extent. The influence of fluoridated pretreatment, inter-layer heat treatment, sintering temperature and the layer of films on the performance of ceria coatings were also investigated. It was found that the inter-layer heat treatment has no influence on improving the anticorrosion resistance of AZ91 alloy. In comparison with the bare one, the I_corr of optimal sample is about 0.0219mA/cm², which decreases by two orders of magnitude, indicating that the ceria coatings could significantly improve the corrosion resistance of AZ91 magnesium alloy.

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Periodical:

Materials Science Forum (Volume 898)

Pages:

1369-1380

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.898.1369

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Online since:

June 2017

Authors:

Hui Min Han, Dan Tong Wang, Hua Qian Yu, Min Zuo*, Li Hong Wang, De Gang Zhao

Keywords:

AZ91 Magnesium Alloy, Ceria Coating, Corrosion Resistance, Sol-Gel, Tafel Curve

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