乙醇对电沉积磷酸钙盐涂层的影响

Effect of Ethyl Alcohol on the Calcium Phosphate Coating by Electrodeposition

采用电化学方法于常温下进行钛金属基底上磷酸钙盐的沉积,通过添加一定量的乙醇于电沉积溶液中,在一定程度上解决了电沉积过程中析氢反应对磷酸钙盐沉积的影响。同时,考察了恒电位沉积时间对磷酸钙盐涂层质量的影响.在一定温度下于碱液中处理后获得的羟基磷灰石(HA)涂层的形貌和结构分别用扫描电子显微镜(SEM)和X-射线衍射仪进行了表征;用粘结拉伸法测量了涂层的界面结合强度达7.18 Mpa,并在模拟生物体液中考察了生物活性以及电化学腐蚀性能。

Modification by adding ethyl alcohol to aqueous electrolyte for electro-depositing calcium phosphate on titanium substrates is investigated at room temperature. Film coated in the electrolyte with ethyl alcohol is more homogeneous and more strongly attached to the substrate. The optimum quantity of ethyl alcohol added is depend on the electrolyte composition such as Ca/P atom ratio. Although the pH value of electrolyte varies as the ethyl alcohol is added, the pH value is adjusted to 4.4. The phases of the deposited film we obtained remain the same as the hydroxyapatite and brushite. The effect of deposition time has been studied. The alkaline solution treatment was used to convert the electrodeposited calcium phosphate ceramic coatings into a pure hydroapatite microcrystal. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) are used to characterize the morphology and structure of the electrodeposited coatings. The XRD pattern of the coating confirmed that the calcium phosphate coating had a crystalline structure with apatitic characteristics similar to bone apatite. The bonding strength of the coating to Ti substrate was measured as 7. 18 Mpa.