摘要
由于Na2EDTA有六个配位原子,可以和Ca,Mg等离子形成稳定的水溶性络合物,可以控制整个反应体系的反应速度。以Ca(OH)2和NaH2PO4为前驱物,通过Na2EDTA辅助诱导在AZ31轧板上制备羟基磷灰石(HA)纳米片膜层;用XRD、HRTEM、FE-SEM、EDS等手段对膜层的结构和形貌进行了表征,结果证实膜层是由厚度为96μm的结晶性良好HA纳米片组成;讨论了Na2EDTA辅助诱导生成HA的反应机理。质量分数为0.9的NaCl溶液的电化学测试结果表明,实验所得的HA膜层相对于基体自腐蚀电位正移,进一步地证实HA膜层可以有效地防护镁合金基底。
The six coordinating atoms of Na2EDTA could coordinate with Ca2+ and Mg2+ to form stable water-soluble complexes,which can control the reaction speed. In this paper,Ca(OH)2and NaH2PO4 were used as starting materials.The formation of hydroxyapatite(HA) nanosheet coating on AZ31 rolled Mg alloy substrate was induced by Na2EDTA.XRD,HRTEM,FE-SEM and EDS results demonstrate that as-obtained coating was well-crystallized HA with a thickness of 96 μm.The possible formation mechanism of HA coating was discussed.The electrochemical results in 0.9 w t.% NaCl solution show that corrosion potential shifted positively with respec to the AZ31 Mg alloy substrate,suggesting that the HA coating can effectively protectc Mg alloy substrate.
出处
《太原理工大学学报》
CAS
北大核心
2013年第3期312-316,325,共6页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助(51001079
21201129)
高等学校博士点专项科研基金(20091402110010)
中国博士后科学基金(20100471586)
山西省高等学校青年学术带头人支持计划
山西省自然科学基金(2011011020-2
2010021023-1)
太原理工大学校青年基金(2012L00S)