Transactions of Materials and Heat Treatment. 2011, (09) Core

Microstructure and degradation performance of hydroxyapatite coatings on a magnesium alloy prepared by electro-depositionChinese Full Text

CUI Tong,GUAN Ren-guo(College of Materials and Metallurgy,Northeastern University,Shenyang 110006,China)

Abstract: Hydroxyapatite（HA） coatings on the surface of Mg-4.0Zn-1.0Ca-0.6Zr alloy sheet were prepared by a process of pre-treatment in hot alkali solution,electro-deposition and post-treatment in hot alkali solution.The microstructure and morphology of the coatings were observed and analyzed by means of X-ray diffraction and scanning electron microscopy,as well as its degradation behavior in SBF was examined.The results indicate that the dense HA coating on the magnesium alloy with the ratio of Ca and P of 1.72,which is close to that of the human bone tissue of 1.67,is obtained with the processing parameters of voltage of 10 V and temperature of 50 ℃.When Mg-4.0Zn-1.0Ca-0.6Zr alloy specimen with HA coatings is immersed in SBF,the HA coating is penetrated and the alloy substrate is found to be etched by SBF after 3 d.With increasing of corrosion time,the diameter of some pittings increases and becomes localized corrosion.Its initial corrosion rate in SBF is lower than that of the uncoated alloy sheet,as well as the change of its initial pH values is lower than that of the uncoated sheet and with increasing of time,the extent of pH value changes significantly.The average pH value is nearly 9.2 after 10 days and subsequently becomes stable gradually.The initial self-corrosion potential of the HA coated sheet compared with the uncoated sheet is shifted positively by 200 mV,which indicates that the initial corrosion resistance of the alloy sheet after HA coatings is improved,and the corrosion rate increases with flaking off of the HA coatings.

Keywords：

electro-deposition treatment; HA coatings; biological materials; degradation;

DOI：
10.13289/j.issn.1009-6264.2011.09.022
Series：
Subject：
Classification Code：
TG174.4

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
HTML
CAJ Download
PDF Download

Contents

Microstructure and degradation performance of hydroxyapatite coatings on a magnesium alloy prepared by electro-depositionChinese Full Text

CUI Tong,GUAN Ren-guo(College of Materials and Metallurgy,Northeastern University,Shenyang 110006,China)

Read on your phone instantly

Citation Network

Related Literature