先用10 mol/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0.042 mol/L,磷酸二氢铵0.025 mol/L,EDTA-2Na 1.5×10-4 mol/L,温度65℃,pH 4.5,电流密度1 mA/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CO32-含量,增加OH-,有效减少了涂层的镍含量.
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