Micro-arc oxidation parameters effects on properties and thickness of coatings on AZ91D magnesium alloy (Review of articles published in Chinese journals)
https://doi.org/10.31615/j.corros.prot.2023.108.2-4
Abstract
The paper arranges the material of scientific articles published in Chinese national journals on microarc oxidation of magnesium alloy AZ91D, widely used and studied in China. The influence of the oxidation time, current density, duty cycle, voltage and frequency on the structure, properties and growth rate of the resulting oxide films formed in the MDO process is described. It is revealed that an increase in the values of the MDO process parameters in most cases leads to an increase of the layer growth rate, while the structure of the growing oxide film and its corrosion properties change. It is shown that the thicker the coating, the more uneven its structure, pores diameter increases, their number decreases, this leads to reduction of the corrosion resistance of the oxide film. Applied voltage has the greatest effect on the thickness and corrosion protection properties of oxide coatings. The necessity of using orthogonal testing methods for the selection of optimal MDO modes in order to obtain the most corrosion-resistant oxide coatings on magnesium alloy AZ91D is shown. Article gives the modes for obtaining microarc oxide coatings on the AZ91D alloy with high corrosion properties.
About the Author
M. L. Kosterina
LLC «Transenergostroy»
Russian Federation
Russian Federation
Mariana L. Kosterina, Ph.D. in Technical Science, Adviser Director General
str 2, 26, Zoologicheskaya str, Moscow, 119071
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Review
For citations:
Kosterina M.L. Micro-arc oxidation parameters effects on properties and thickness of coatings on AZ91D magnesium alloy (Review of articles published in Chinese journals). Theory and Practice of Corrosion Protection. 2023;28(2):28-42. (In Russ.) https://doi.org/10.31615/j.corros.prot.2023.108.2-4
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