Influences of Surface Finishes on Properties of Biological Zinc Phosphate Conversion Coating on Titanium
Influences of Surface Finishes on Properties of Biological Zinc Phosphate Conversion Coating on Titanium
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DOI：
10.1002/pssa.201800143
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发表时间：
2018-11-07
影响因子：
2
通讯作者：
Qian, Qian
中科院分区：
文献类型：
--
作者：
Shi, Xingling;Zhu, Haiming;Qian, Qian
化学形成的磷酸盐转化膜（PCC）通常由于原位生长而具有良好的附着强度，在生物医学应用中具有巨大的潜力。然而，在钛（Ti）金属上制备PCC的研究很少，因为固有的化学惰性和氧化层阻碍了溶解过程。在此之前，作者通过一种新的水热磷化方法成功地在纯钛上制备了完整的PCC，并且涂层表现出良好的结合力。然而，金相抛光试样仅用于消除表面形貌的影响。在这项研究中，这种方法进行砂纸抛光和酸蚀纯钛的可行性进行了研究。结果表明，粗糙表面有利于PCC的成核和晶粒细化，而光滑表面有利于PCC晶粒的充分生长，涂层厚度较厚，结合强度较强。尽管表面粗糙，但由于氢化钛的存在，酸蚀钛上PCC的形成受到抑制。所有涂层都明显提高了钛基体的耐蚀性。细胞毒性试验表明，PCCs对L-929细胞无不良影响，细胞毒性等级为0-I级。研究表明，水热锌磷化法具有广泛应用于不同表面处理的钛基植入体的潜力。
Chemically formed phosphate conversion coatings (PCC) usually have good adhesion strength due to in situ growth and have great potential for biomedical applications. However, the fabrication of PCC on titanium (Ti) metals has seldom been studied because inherent chemical inertia and oxide layer block the dissolving process. Previously, the authors successfully fabricate intact PCC on pure Ti by a novel hydrothermal phosphorization method, and the coating shows good adhesion. However, metallographically polished specimens are used only in order to eliminate the influences of surface topography. In this study, the feasibility of such method to be performed on sandpaper polished and acid-etched pure Ti are studied. Results show that rough surface benefit the nucleation of PCC and refine the crystal size, whereas, a smooth surface allow sufficient growth of crystal grain resulting in a thicker coating with stronger adhesive strength. In spite of rough surface, PCC formation on acid-etched Ti is depressed due to the existence of titanium hydride. All the coatings obviously improve corrosion resistance of Ti substrate. The cytotoxicity test suggests that the PCCs present no adverse effects on L-929 cells and has a cytotoxicity ranking of 0-I grade. The study shows that the hydrothermal zinc phosphorization has a potential to be extensively used for Ti-based implants with different surface finishes.