乙二胺四乙酸二钠对镍钛合金表面电沉积羟基磷灰石涂层的影响

Effect of disodium ethylenediaminetetraacetate on hydroxyapatite electrodeposition on nickel-titanium alloy surface

先用10mol/L的NaOH溶液处理镍钛片,随后采用电沉积法制备羟基磷灰石涂层。电沉积工艺参数为:硝酸钙0.042mol/L,磷酸二氢铵0.025mol/L,EDTA-2Na1.5×10-4mol/L,温度65℃,pH4.5,电流密度1mA/cm2,时间1h。采用扫描电镜、红外光谱仪和能谱仪对所得涂层进行表征。NaOH溶液处理有利于羟基磷灰石的生长。溶液中EDTA-2Na的存在不影响羟基磷灰石的生成,只是促使羟基磷灰石末端聚拢,使羟基磷灰石之间的空隙扩大,并减少涂层的CO3-2含量,增加OH-,有效减少了涂层的镍含量。

A hydroxyapatite coating was prepared on nickel-titanium sheet surface pretreated with 10 mol/L NaOH solution by electrodeposition from a bath containing Ca（NO3）2 0.042 tool/L, NH4H2PO4 0.025 mol/L, and EDTA-2Na 1.5× 10-4mol/L at temperature 65 ℃, pH 4.5, and current density l mA/cm2 for 1 h. The obtained coating was characterized by scanning electron microscopy, infrared spectroscopy, and energy-dispersive spectroscopy. NaOH treatment facilitates the growth of hydroxyapatite coating. The presence of EDTA-2Na in solution does not affect the formation of hydroxyapatite but facilities the convergence of the tip of hydroxyapatite and expands the interspace between single hydroxyapatite. There is a decrease in CO32- content but an increase in OH-content in the hydroxyapatite coating with the addition of EDTA-2Na to solution. The nickel content in hydroxyapatite coating is reduced effectively.