Corrosion resistance and electrical conductivity of V/Ce conversion coating on magnesium alloy AZ31B

A V/Ce conversion coating was deposited in the surface of AZ31B magnesium alloy in a solution containing vanadate and cerium nitrate. The coating composition and morphology were examined. The conversion coating appears to consist of a thin and cracked coating with a scattering of spherical particles...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials Vol. 30; no. 4; pp. 653 - 659
Main Authors: Yang, Jinxiao, Wang, Xudong, Cai, Yiren, Yang, Xiuyu
Format: Journal Article
Language:English
Published: Beijing University of Science and Technology Beijing 01-04-2023
Springer Nature B.V
Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China%NAURA Technology Group Co.,Ltd,Beijing 100176,China
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Summary:A V/Ce conversion coating was deposited in the surface of AZ31B magnesium alloy in a solution containing vanadate and cerium nitrate. The coating composition and morphology were examined. The conversion coating appears to consist of a thin and cracked coating with a scattering of spherical particles. The corrosion behavior of the substrate and conversion coating was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Compared with AZ31B magnesium alloy, the corrosion current density of the conversion coating is decreased by two orders of magnitude. The total impedance of the V/Ce conversion coating rise to 1.6 × 10 3 Ω·cm 2 in contrast with 2.2 × 10 2 Ω·cm 2 of the bare AZ31B. In addition, the electrical conductivity of the coating was assessed by conductivity meter and Mott-Schottky measurement. The results reveal a high dependence of the conductivity of the coating on the semiconductor properties of the phase compositions.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-022-2463-y