The effect of Sb2O3 on the properties of micro‐arc oxidation coatings on magnesium alloys

Coatings incorporated with Sb2O3 were obtained on AZ31B magnesium alloy during micro‐arc oxidation (MAO) by adding Sb2O3 (0, 2, 4, 6, 8 g/L) into the electrolyte. The voltage of MAO process, microstructure, element distribution, thickness, phase analysis, microhardness, adhesion, and corrosion behav...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2019-11, Vol.16 (6), p.2273-2282
Main Authors: Wang, Ping, Cao, Wenjie, Yang, Bo, Yang, Qiuguo, Pu, Jun, Gong, Zeyu, Hu, Jie, Guo, Xiaoyang, Xiang, Dong
Format: Article
Language:English
Subjects:
Adhesion
Antimony trioxide
AZ31B magnesium alloy
Corrosion
Corrosion rate
Corrosion resistance
Electric potential
Magnesium base alloys
Microhardness
Microstructure
micro‐arc oxidation
Morphology
Oxidation
Phase composition
properties
Protective coatings
Sb2O3
Substrates
Thickness
Voltage
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Summary:Coatings incorporated with Sb2O3 were obtained on AZ31B magnesium alloy during micro‐arc oxidation (MAO) by adding Sb2O3 (0, 2, 4, 6, 8 g/L) into the electrolyte. The voltage of MAO process, microstructure, element distribution, thickness, phase analysis, microhardness, adhesion, and corrosion behavior of the coatings were, respectively, investigated. The results showed that the addition of different concentrations of Sb2O3 caused the voltage variation, which resulted in the changes in microstructure, element distribution, and phase composition of coatings, and further led to the improvement of coatings properties. It was found that the addition of Sb2O3 could effectively decrease the breakdown voltage, and made the voltage of micro‐arc oxidation stage change. Moreover, the presence of Sb2O3 influenced surface morphologies of the coatings. Additionally, with the increase in Sb2O3, the microhardness of coatings was 155.2, 199.78, 277.34, 267.53, and 127.93 HV, respectively; these were higher than substrate (68.5 HV). Moreover, the addition of Sb2O3 effectively improved adhesion. As the Sb2O3 increased, the corrosion rate was 2.19 × 10−4, 9.09 × 10−5, 4.10 × 10−5, 2.52 × 10−4, and 2.96 × 10−4 mm/a, respectively, and the corrosion resistance increased first and then decreased with the increase in Sb2O3. In sum, the optimal Sb2O3 concentration was 4 g/L.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13272