In vitro corrosion of micro-arc oxidation coating on Mg-1Li-1Ca alloy - The influence of intermetallic compound Mg2Ca

被引：126
作者：
Ding, Zi-You [1 ]
Cui, Lan-Yue [1 ]
Chen, Xiao-Bo [2 ]
Zeng, Rong-Chang [1 ]
Guan, Shao-Kang [3 ]
Li, Shuo-Qi [1 ]
Zhang, Fen [1 ]
Zou, Yu-Hong [4 ]
Liu, Qing-Yun [4 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Peoples R China
[2] RMIT Univ, Sch Engn, Carlton, Vic 3053, Australia
[3] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450002, Henan, Peoples R China
[4] Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao 266590, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 764卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Micro-arc oxidation; Coating; Intermetallic compounds; Degradation; MG-CA ALLOYS; SIMULATED BODY-FLUID; MAGNESIUM ALLOYS; FORMATION MECHANISM; VIVO CORROSION; RESISTANCE; DEGRADATION; IMPLANTS; BEHAVIOR; PHASE;
D O I：
10.1016/j.jallcom.2018.06.073
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 presence of second phase Mg2Ca has remarkable impacts on the formation and degradation of MAO coating. Microstructure, formation and degradation behaviors of substrate and MAO coating were performed. Results revealed that pitting and filiform corrosion occurred on bare Mg-1Li-1Ca alloy. MAO coating significantly improved the corrosion resistance of alloy. The roles of Mg-2-Ca on the formation and degradation mechanisms of MAO coating were discussed. Micro-arc oxidation for the Mg-Li-Ca alloy initiated at alpha-Mg phase with depleted Ca content. The growth rate of coating on a-Mg phase is faster than that of GBs/Mg2Ca. The MAO coating began to degrade from intermetallic compound Mg2Ca, then it underwent the attack from the solution and stress concentration caused by corrosion products. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：250 / 260
页数：11
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