Effects of magnetic field and deposition time on structure and properties of MAO/Ti coating on AZ31B magnesium alloy

被引：0

作者：

Cui, Xue-Jun ^{[1
,2
]}

Liu, Chun-Hai ^{[1
,2
]}

Yang, Rui-Song ^{[1
,2
]}

Li, Ming-Tian ^{[1
,2
]}

Lin, Xiu-Zhou ^{[1
,2
]}

机构：

[1] School of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong,643000, China

[2] Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science and Engineering, Zigong,643000, China

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2016年 / 26卷 / 09期

关键词：

Corrosion resistant coatings - Drops - Friction - Phase structure - Corrosion resistant alloys - Electrolysis - Ion implantation - Magnesium alloys - Composite coatings;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The MAO/Ti composite coating was fabricated on AZ31B Mg alloy through a combined process of micro-arc oxidation (MAO) with multi-arc ion plating. The morphology, composition, phase structure and corrosion resistance of the coatings were evaluated using SEM, EDS, XRD and electrochemical methods. The results show that, with the magnetic current increasing from 0 A to 20 A, the temperature of vacuum chamber increases to 192℃ from 128℃, and the number of the droplet with large size on MAO/Ti coating decreases. When the deposition time increases from 30 min to 120 min at magnetic current of 10 A, the temperature of vacuum chamber increases sharply, the droplet number increases gradually, and the surface of MAO/Ti coating appears micro-cracks. However, under condition without magnetic field, the surface of the MAO/Ti coating presents plenty of droplets with the deposition time increases from 30 min to 120 min, and the surface of MAO coating is coated gradually by the Ti coating. The phase structures of MAO coating don't change during this multi ion plating, while the φcorr of the MAO/Ti coating shifts to a positive potential, and the Jcorr decreases slightly. It can be concluded that the neutral or charged particles with large size may be filtered or decreased by controlling the magnetic current. Meanwhile, the magnetic increases movement velocity of the arc spot and rises the temperature of the cathode target, which could result in an increasing of droplets on the MAO/Ti coating. Although all results prove that the Ti coating further enhances the corrosion protection ability of the MAO coating on AZ31 Mg alloy, the compact Ti coating is required to be fabricated to provide a better properties through process optimization. © 2016, Science Press. All right reserved.

引用

页码：1943 / 1951