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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 296-307. doi: https://doi.org/10.3365/KJMM.2017.55.5.296
마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
Factors Influencing Plasma Electrolytic Oxidation(PEO) Coatings on Magnesium Alloys: A Review
Gunchoo Shim
KISTI ReSEAT Program, Daejon 34141, Republic of Korea
Correspondence  Gunchoo Shim ,Tel: +82-42-864-2205, Email: gcshim@reseat.re.kr
Received: 1 September 2016;  Accepted: 22 November 2016.  Published online: 9 May 2017.
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is derived from conventional anodizing, it uses eco-friendly electrolytes and forms thicker, denser, and harder coatings on the surface of magnesium alloys. However, PEO is a complex process involving physical, chemical, and electrochemical reactions, and it is influenced by various factors such as the alloy substrate composition, electrolyte/additive composition, and the electrical variables including the mode of power supply, applied voltage/current density, frequency, and duty cycle. In this article, the detailed effects of these parameters on the microstructure and properties of the PEO coatings are reviewed, and methods of improving the coatings are proposed.
Keywords: magnesium alloys, plasma electrolytic oxidation (PEO), coatings, corrosion, electrolytes, process variables
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