Fabrication and characterization of rod-like nano-hydroxyapatite on MAO coating supported on Mg-Zn-Ca alloy

被引:116
作者
Gao, J. H. [1 ]
Guan, S. K. [1 ]
Chen, J. [1 ,2 ]
Wang, L. G. [1 ]
Zhu, S. J. [1 ]
Hu, J. H. [1 ]
Ren, Z. W. [1 ]
机构
[1] Zhengzhou Univ, Sch Mat Sci & Engn, Mat Res Ctr, Zhengzhou 450002, Henan, Peoples R China
[2] Osaka Univ, Div Mat & Mfg Sci, Osaka 5670047, Japan
基金
中国国家自然科学基金;
关键词
Nano-HA; MAO coating; Electrochemical deposition; Immersion; ELECTROCHEMICAL CORROSION BEHAVIOR; MAGNESIUM ALLOY; IN-VITRO; GEL COATINGS; ELECTRODEPOSITION; COMPOSITE; OXIDATION; AZ91D; DEGRADATION; BIOACTIVITY;
D O I
10.1016/j.apsusc.2010.09.080
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 poor corrosion resistance of magnesium alloys is a dominant problem that limits their clinical application. In order to solve this challenge, micro-arc oxidation (MAO) was used to fabricate a porous coating on magnesium alloys and then electrochemical deposition (ED) was done to fabricate rod-like nano-hydroxyapatite (RNHA) on MAO coating. The cross-section morphology of the composite coatings and its corresponding energy dispersion spectroscopy (EDS) surficial scanning map of calcium revealed that HA rods were successfully deposited into the pores. The three dimensional morphology and scanning electron microscopy (SEM) image of the composite coatings showed that the distribution of the HA rods was dense and uniform. Atomic force microscope (AFM) observation of the composite coatings showed that the diameters of HA rods varied from 95 nm to 116 nm and the root mean square roughness (RMS) of the composite coatings was about 42 nm, which were favorable for cellular survival. The bonding strength between the HA film and MAO coating increased to 12.3 MPa, almost two times higher than that of the direct electrochemical deposition coating (6.3 MPa). Compared with that of the substrate, the corrosion potential of Mg-Zn-Ca alloy with composite coatings increased by 161 mV and its corrosion current density decreased from 3.36x10(-4) A/cm(2) to 2.40x10(-7) A/cm(2) which was due to the enhancement of bonding strength and the deposition of RNHA in the MAO pores. Immersion tests were carried out at 36.5 +/- 0.5 degrees C in simulated body fluid (SBF). It was found that RNHA can induce the rapid precipitation of calcium orthophosphates in comparison with conventional HA coatings. Thus magnesium alloy coated with the composite coatings is a promising candidate as biodegradable bone implants. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:2231 / 2237
页数:7
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