Endo K
Department of Dental Materials Sciences, Health Sciences University of Hokkaido, Japan.
Dent Mater J. 1995 Dec;14(2):199-210. doi: 10.4012/dmj.14.199.
The corrosion resistance of a NiTi alloy, chemically modified with a human plasma fibronectin (pFN) using an aminosilane and a glutaraldehyde, was examined by electrochemical techniques in a 0.9% NaCl solution and a cell culture medium containing serum. The role of serum proteins in influencing the passive behavior of the alloy was extensively studied by anodic polarization and X-ray photoelectron spectroscopy (XPS). The passive current density increased in the presence of serum proteins. The enhanced dissolution of the passive film appears to be a consequence of quick adsorption of the serum proteins and the subsequent formation of metal ion-protein complexes on the film surface. With the chemical modification, the corrosion rate was reduced by approximately 50% in both solutions due to a highly cross-linked siloxane network formed on the alloy surface. This network layer limited the diffusion of dissolved oxygen, metal ions, and biological molecules involved in the corrosion reactions.
使用氨基硅烷和戊二醛对镍钛合金进行人血浆纤连蛋白（pFN）化学修饰，通过电化学技术在0.9%氯化钠溶液和含血清的细胞培养基中检测其耐腐蚀性。通过阳极极化和X射线光电子能谱（XPS）广泛研究了血清蛋白对合金钝性行为的影响。在血清蛋白存在下，钝化电流密度增加。钝化膜溶解增强似乎是血清蛋白快速吸附以及随后在膜表面形成金属离子-蛋白质复合物的结果。通过化学修饰，由于在合金表面形成了高度交联的硅氧烷网络，两种溶液中的腐蚀速率均降低了约50%。该网络层限制了参与腐蚀反应的溶解氧、金属离子和生物分子的扩散。
