THE INFLUENCE OF VARIOUS ADDITIVES ON THE PROPERTIES OF PEO COATINGS FORMED ON AZ31 Mg ALLOY

Zeeshan Ur Rehman, Byung-Hyun Ahn, Yeong Seung Jeong, Jung-Il Song and Bon-Heun Koo
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Zeeshan Ur Rehman: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea
Byung-Hyun Ahn: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea
Yeong Seung Jeong: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea
Jung-Il Song: #x2020;Department of Mechanical Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea
Bon-Heun Koo: School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea

Surface Review and Letters (SRL), 2016, vol. 23, issue 03, 1-7

Abstract: In this work, plasma electrolytic oxidation (PEO) ceramic coatings were prepared on magnesium AZ31B alloy. Various electrolyte solutions including phosphate, aluminate and silicate as additives and NaOH + Na2SiF6 as constant agent were used to prepare the coatings. Influence of the additives on chemical composition and structure of the PEO coatings were examined by means of scanning electron microscope (SEM) and XRD. From structural analysis it was found that coatings prepared in the aluminate-based electrolyte have the best structural features. Microhardness and tribological characteristics of the PEO coatings were investigated using Vickers hardness test and pin-on-disc test. Microhardness for aluminate-based coating was found to be 1169.63HV while those for silicate-and phosphate-based coatings were 1093.42HV and 285.91HV, respectively. Wear rate of the aluminate-based coating was found to be lowest than all other coatings having a value of 2.78×10−3mg/Nm.

Keywords: AZ31B; PEO; phosphates; aluminates; silicates; hardness; wear rate (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X16500062

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