表面工程应用实例【例35】新型纳米无磷转化膜的研究与应用

Sandblasted and Acid-etched Process Optimization of the Dental Implant

磷化是涂装前处理的中心环节，是指把金属工件经过含有磷酸二氢盐的酸性溶液处理，发生化学反应而在其表面生成一层稳定的不溶性磷酸盐膜层的方法，所生成的膜称为磷化膜。黑色金属涂装前处理通常采用磷化工艺来提高涂层的附着力和耐蚀性。但是磷化过程不可避免的产生含磷、重金属的废水，以及大量的磷化渣等污染物，这成为制约涂装发展的重要因素。因此，发展无磷、无重金属排放的涂装前处理技术已经成为研究热点。

In this paper,sandblasting and acid-etching(SLA)process on titanium surface was investigated to improve the surface properties of dental implant.Firstly,the titanium surface was roughened by SLA.The proportion of 0.5-2μm pores and the average contact angle of titanium surface were analyzed by the orthogonal experiment method,which was able to obtain the optimized process of SLA.The optimum parameters are selected within the test range,that is:materials of sandblasting(TiO2),etching temperature(100℃),etching time(20minutes)and acid concentration(60%H2SO4∶10%HCl∶H2O=1∶1∶2).Secondly,the optimum parameters were applied to titanium and real dental implants.The surface morphology,contact angle, adhesion of osteoblast and chemical composition of titanium and dental implants were analyzed by means of scanning electron microscope(SEM),contact angle meter and energy dispersive spectrometer(EDS).The results show that the contact angle of titanium surface is uniform and its value is up to 67°,which is good for cells to attach and survive.Micro-sized porous structure is obtained both on the titanium and on the real dental implant surface;while the surface morphology varies in different parts of the dental implant.