Microstructural characteristics of PEO coating: Effect of surface nanocrystallization

被引：32
作者：
Ao, Ni [1 ]
Liu, Daoxin [1 ]
Zhang, Xiaohua [1 ]
He, Guangyu [2 ]
机构：
[1] Northwestern Polytech Univ, Coll Aeronaut, Inst Corros & Protect, Xian 710072, Peoples R China
[2] Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 823卷
基金：
中国国家自然科学基金;
关键词：
Plasma electrolytic oxidation (PEO); Formation mechanism; Surface nanocrystallization; Barrier layer; Amorphous phase; PLASMA ELECTROLYTIC OXIDATION; MICRO-ARC OXIDATION; CORROSION-RESISTANCE; GROWTH MECHANISMS; MAGNESIUM ALLOY; ALPHA-PHASE; MG ALLOY; EVOLUTION; ALUMINUM; FILMS;
D O I：
10.1016/j.jallcom.2020.153823
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructural characteristics of plasma electrolytic oxidation (PEO) coating and the formation mechanism of the barrier layer in the coating were investigated. Transmission electron microscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscopy-high-angle annular dark-field imaging were used to investigate the morphology, composition, and microstructure of PEO coating and ultrasonic surface rolling process (USRP)-PEO combined coating. The results illustrated that surface nanocrystallization of the USRP-treated titanium alloy promoted the formation of the barrier layer, but had no obvious influence on the porous outer layer of PEO coating. The barrier layer formed on the surface nanosized titanium alloy was thicker (by similar to 27%) than that formed on the original substrate, confirming that this layer was formed via O2- and Ti4+ inter- migration and diffusion. Moreover, the dynamic growth process of this layer could be described as a cyclic process of "formation via ionic migration and diffusion -> dielectric breakdown". The oxide coating was composed of nanocrystalline and amorphous phases resulting from the different cooling rates at different depths in the coating and heterogeneous distribution of phase compositions in the coating. In addition, the reason for the inhomogeneous distribution of P and Si (from the electrolyte) in the coating was clarified. (C) 2020 Elsevier B.V. All rights reserved.
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页数：10
相关论文
共 43 条
[1]   Enhanced fatigue performance of modified plasma electrolytic oxidation coated Ti-6Al-4V alloy: Effect of residual stress and gradient nanostructure [J].
Ao, Ni ;
Liu, Daoxin ;
Zhang, Xiaohua ;
Liu, Chengsong .
APPLIED SURFACE SCIENCE, 2019, 489 :595-607
[2]   Gradient nanostructure evolution and phase transformation of α phase in Ti-6Al-4V alloy induced by ultrasonic surface rolling process [J].
Ao, Ni ;
Liu, Daoxin ;
Xu, Xingchen ;
Zhang, Xiaohua ;
Liu, Dan .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2019, 742 :820-834
[3]   Microstructure and Tribological Behavior of a TiO2/hBN Composite Ceramic Coating Formed via Micro-arc Oxidation of Ti-6Al-4V Alloy [J].
Ao, Ni ;
Liu, Daoxin ;
Wang, Shuaixing ;
Zhao, Qing ;
Zhang, Xiaohua ;
Zhang, Mengmeng .
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2016, 32 (10) :1071-1076
[4]   Characterization of AC PEO coatings on magnesium alloys [J].
Arrabal, R. ;
Matykina, E. ;
Hashimoto, T. ;
Skeldon, P. ;
Thompson, G. E. .
SURFACE & COATINGS TECHNOLOGY, 2009, 203 (16) :2207-2220
[5]   Role of sintering and clay particle additions on coating formation during PEO processing of AM50 magnesium alloy [J].
Blawert, Carsten ;
Sah, Santosh Prasad ;
Liang, Jun ;
Huang, Yuanding ;
Hoeche, Daniel .
SURFACE & COATINGS TECHNOLOGY, 2012, 213 :48-58
[6]   The effects of anion deposition and negative pulse on the behaviours of plasma electrolytic oxidation (PEO)-A systematic study of the PEO of a Zirlo alloy in aluminate electrolytes [J].
Cheng, Yingliang ;
Wang, Ting ;
Li, Shaoxian ;
Cheng, Yulin ;
Cao, Jinhui ;
Xie, Huanjun .
ELECTROCHIMICA ACTA, 2017, 225 :47-68
[7]   Growth mechanisms of Ca- and P-rich MAO films in Ti-15Zr-xMo alloys for osseointegrative implants [J].
Correa, D. R. N. ;
Rocha, L. A. ;
Ribeiro, A. R. ;
Gemini-Piperni, S. ;
Archanjo, B. S. ;
Achete, C. A. ;
Werckmann, J. ;
Afonso, C. R. M. ;
Shimabukuro, M. ;
Doi, H. ;
Tsutsumi, Y. ;
Hanawa, T. .
SURFACE & COATINGS TECHNOLOGY, 2018, 344 :373-382
[8]   Growth process of plasma electrolytic oxidation films formed on magnesium alloy AZ91D in silicate solution [J].
Duan, Hongping ;
Yan, Chuanwei ;
Wang, Fuhui .
ELECTROCHIMICA ACTA, 2007, 52 (15) :5002-5009
[9]   TEM Analysis on Micro-Arc Oxide Coating on the Surface of Magnesium Alloy [J].
Huang, Yuan-Sheng ;
Liu, Hong-Wei .
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2011, 20 (03) :463-467
[10]   An investigation of ceramic coating growth mechanisms in plasma electrolytic oxidation (PEO) processing [J].
Hussein, R. O. ;
Nie, X. ;
Northwood, D. O. .
ELECTROCHIMICA ACTA, 2013, 112 :111-119
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