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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 1/2015

01-01-2015

Investigation of Carboxylic Acid-Neodymium Conversion Films on Magnesium Alloy

Authors: Xiufang Cui, Zhe Liu, Lili Lin, Guo Jin, Haidou Wang, Binshi Xu

Published in: Journal of Materials Engineering and Performance | Issue 1/2015

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Abstract

The new carboxylic acid-neodymium anhydrous conversion films were successfully prepared and applied on the AZ91D magnesium alloy surface by taking absolute ethyl alcohol as solvent and four kinds of soluble carboxylic acid as activators. The corrosion resistance of the coating was measured by potentiodynamic polarization test in 3.5 wt.% NaCl solution in pH 7.0. The morphology, structure, and constituents of the coating were observed by scanning electron microscope, energy dispersivespectrum, x-ray photoelectron spectrum, and Fourier infrared spectrometer. Results show that corrosion resistance properties of samples coated with four different anhydrous conversion films were improved obviously. The corrosion potential increased, corrosion current density decreased, and polarization resistance increased. Among these four kinds of conversion films the one added with phytic exhibits the best corrosion resistant property. The mechanism of anhydrous-neodymium conversion film formation is also analyzed in this paper. It reveals that the gadolinium conversion coating is mainly composed of stable Nd2O3, MgO, Mg(OH)2, and carboxylate of Nd. And that the sample surface is rich in organic functional groups.
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Metadata
Title
Investigation of Carboxylic Acid-Neodymium Conversion Films on Magnesium Alloy
Authors
Xiufang Cui
Zhe Liu
Lili Lin
Guo Jin
Haidou Wang
Binshi Xu
Publication date
01-01-2015
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 1/2015
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-014-1263-6

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