Effects of processing parameters on the adhesion and corrosion resistance of oxide coatings grown by plasma electrolytic oxidation on AZ31 magnesium alloys

文化大學機構典藏 CCUR > 理工學院 > 工學院 > 化學工程與材料工程學系暨碩士班 > 期刊論文 > Item 987654321/49511

Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/49511

Title:	Effects of processing parameters on the adhesion and corrosion resistance of oxide coatings grown by plasma electrolytic oxidation on AZ31 magnesium alloys
Authors:	Lou, BS (Lou, Bih-Show) Yen, CA (Yen, Chien-An) Chen, YY (Chen, Yen-Yu) Lee, JW (Lee, Jyh-Wei)
Contributors:	化材系
Keywords:	Plasma electrolytic oxidation AZ31 Mg alloy Pulsed bipolar mode Taguchi method Corrosion resistance Nanoindentation Adhesion
Date:	2021-01
Issue Date:	2021-04-24 14:15:08 (UTC+8)
Abstract:	In this work, the plasma electrolytic oxidation (PEO) process using a pulsed bipolar direct current (DC) power supply and sodium aluminate-based electrolyte was employed to grow the oxide layer on the AZ31 Mg alloy. For achieving a higher adhesion or a better corrosion resistance of oxide layer, the Taguchi L9 orthogonal array was adopted to determine the optimal PEO parameters, including anode on-time, anode current setting, cathode current setting, and cathode on-time. According to the signal-to-noise ratio and analysis of variance, the anode on-time was the most important control factor for improving adhesion and corrosion resistance properties of oxide coatings. The surface morphologies of all oxide coatings were typical crater-like microstructures. The oxide layer thickness can be increased by longer anode on-time and higher anode current. The hardness of the oxide layer was between 12.7 and 17.7 GPa due to the formation of MgAl2O4 phase. Through the confirmation experiments using the optimized PEO processing parameters, the maximum adhesion critical load of 41.8 N can be obtained. On the other hand, the highest polarization resistance of 6.68 x 103 k Omega cm2 was achieved, which was 6485 times better than the bare AZ31 substrate due to its compact microstructure, and a dense and continuous inner barrier layer at the coating/substrate interface. (C) 2021 The Authors. Published by Elsevier B.V.
Relation:	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 卷冊: 10 頁數: 1355-1371
Appears in Collections:	[化學工程與材料工程學系暨碩士班] 期刊論文

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