Energy consumption and corrosion resistance of MAO coatings with same thicknesses fabricated under different voltages

Abstract

Abstract: AZ91D magnesium alloy was treated by micro-arc oxidation (MAO) technique in the silicate-containing electrolyte, and two groups of MAO coatings that have same thickness of 25 μm and same thickness of 40 μm were prepared respectively by adjusting voltage. The time for treatment, energy consumption, mass to thickness ratio and corrosion resistance of the two groups of equal thickness coatings were investigated in the case of increase of voltage, and compared further with each other trying to find out latent regularity. The results show that with the increase of voltage, the time for treatment as well as the energy consumption of the two groups of equal thickness coatings are both shortened and reduced respectively. At the same time, in contrast to coatings with thickness of 25 μm, those with thickness of 40 μm need longer time for treatment and consume more energy. Meanwhile, due to the low density of 40 μm coating, its corrosion resistance in sodium chloride medium is poorer, but its thicker thickness makes coatings exhibiting more excellent corrosion resistance in HNO₃ corrosive medium.

Key words: magnesium alloy, micro-arc oxidation, coating thickness, energy consumption, corrosion resistance

CLC Number:

TG174

MA Ying, LIANG Zhi-long, AN Ling-yun, SUN Le, WANG Sheng, WANG Zhan-ying. Energy consumption and corrosion resistance of MAO coatings with same thicknesses fabricated under different voltages[J]. Journal of Lanzhou University of Technology, 2020, 46(4): 6-9.

References

[1] GRAY J E,LUAN B.Protective coatings on magnesium and its alloys—a critical review [J].Journal of Alloys and Compounds,2002,336(1/2):88-113.
[2] WANG R Q,WU Y K,WUG R,et al.An investigation about the evolution of microstructure and composition difference between two interfaces of plasma electrolytic oxidation coatings on Al [J].Journal of Alloys and Compounds,2018,753:272-281.
[3] WHEELER J M,COLLIER C A,PAILLARD J M,et al.Evaluation of micromechanical behaviour of plasma electrolytic oxidation (PEO) coatings on Ti-6Al-4V [J].Surface & Coatings Technology,2010,204(21/22):3399-3409.
[4] NABAVI H F,ALIOFKHAZRAEI M,ROUHAGHDAM A S.Morphology and corrosion resistance of hybrid plasma electrolytic oxidation on CP-Ti [J].Surface & Coatings Technology,2017,322:59-69.
[5] MONTAZREI M,DEHGHANIAN C,SHOKOUHFAR M,et al.Investigation of the voltage and time effects on the formation of hydroxyapatite-containing titania prepared by plasma electrolytic oxidation on Ti-6Al-4V alloy and its corrosion behavior [J].Applied Surface Science,2011,257(16):7268-7275.
[6] SU P,WU X,JIANG Z,et al.Effects of working frequency on the structure and corrosion resistance of plasma electrolytic oxidation coatings formed on a ZK60 Mg alloy [J].International Journal of Applied Ceramic Technology,2011,8(1):112-119.
[7] LU Shaofu,LOU Bihshow,YANG Yungchin,et al.Effects of duty cycle and electrolyte concentration on the microstructure and biocompatibility of plasma electrolytic oxidation treatment on zirconium metal [J].Thin Solid Films,2015,596:87-93.
[8] 马颖,剡晓旭,王晟,等.偏钒酸铵对镁合金微弧氧化着色膜的影响 [J].兰州理工大学学报,2016,42(6):1-4.
[9] 崔学军,平静,窦宝捷,等.几种添加剂作用的微弧氧化膜表面结构及防腐性能 [J].中国表面工程,2018,31(2):39-50.
[10] GU Y,BANDOPADHYAY S,CHEN C,et al.Effect of oxidation time on the corrosion behavior of micro-arc oxidation produced AZ31 magnesium alloys in simulated body fluid [J].Journal of Alloys & Compounds,2012,543(543):109-117.
[11] 杜翠玲,陈静,汤莉,等.正向电压对ZK60镁合金微弧氧化过程及膜层的影响 [J].中国有色金属学报,2014,24(5):1118-1126.
[12] XU J,LIU F,LUO J,et al.Effects of anodic voltages on microstructure and properties of plasma electrolytic oxidation coatings on biomedical NiTi alloy [J].Journal of Materials Science & Technology,2013,29(1):22-28.
[13] ZHU W,FANG Y J,ZHENG H,et al.Effect of applied voltage on phase components of composite coatings prepared by micro-arc oxidation [J].Thin Solid Films,2013,544:79-82.
[14] 严志军,朱新河,程东,等.影响铝合金微弧氧化成膜效率的因素分析 [J].大连海事大学学报,2007,33(4):113-117.
[15] 王晓波,田修波,巩春志,等.一种低能耗微弧氧化电解液的设计方法 [J].表面技术,2012,41(5): 85-88.
[16] WANG Xiaobo,TIAN Xiubo,GONG Chunzhi.Effect of Na₂CO₃ on energy consumption of micro-arc oxidation of magnesium alloy [J].稀有金属材料与工程,2012,41(专辑1):187-189.
[17] 刘杰,严志军,朱新河,等.低能耗铝合金微弧氧化技术的研究 [J].装备制造技术,2007(6):54-56.
[18] 马颖,冯君艳,马跃洲,等.镁合金微弧氧化膜耐蚀性表征方法的对比研究 [J].中国腐蚀与防护学报,2010,30(6):442-448.
[19] DONG Hairong,MA Ying,WANG Sheng,et al.Effect of growth rate on microstructure and corrosion resistance of micro-arc oxidation coatings on magnesium alloy[J].Rare Metal Materials and Engineering,2017,46(9):2399-2404.
[20] SONG Y,DONG K,SHAN D,et al.Investigation of a novel self-sealing pore micro-arc oxidation film on AM60 magnesium alloy [J].Journal of Magnesium and Alloys,2013,1(1):82-87.