Influence of different chelating agents on corrosion performance of microstructured hydroxyapatite coatings on AZ91D magnesium alloy
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- 作者：Dandan Zhao 赵丹丹 ; Ruixue Sun 孙瑞雪…
- 关键词：Key wordsmagnesium alloy ; hydroxyapatite coating ; chelating agent ; corrosion resistance
- 刊名：Journal of Wuhan University of Technology-Mater. Sci. Ed.
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：32
- 期：1
- 页码：179-185
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general;
- 出版者：Wuhan University of Technology
- ISSN：1993-0437
- 卷排序：32
文摘
To improve the bioactivity and corrosion resistance of AZ91D magnesium alloy, hydroxyapatite (HAp) coatings with novel microstructured morphologies were prepared successfully on AZ91D substrates via a facile hydrothermal method. Different chelating agents including polyaspartic acid (PASP) and ethylenediaminetetraacetic acid (EDTA) were introduced to investigate their effects on the morphology and corrosion resistance of the coated magnesium alloys. The results revealed that the coating prepared with PASP was composed of many uniform urchin-like microspheres, while the coating prepared with EDTA consisted of many flower-like particles. Moreover, the crystallinity of the coating prepared with EDTA was much higher than that of the coating prepared with PASP. Electrochemical tests revealed that the corrosion resistance of the substrate was significantly improved after being coated with each coating. Immersion test of the coated samples in simulated body fluid (SBF) demonstrated that the coatings could be biodegraded gradually and induce the formation of calcium phosphate particles.