Vijayalakshmi U, Prabakaran K, Rajeswari S
Department of Analytical Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
J Biomed Mater Res A. 2008 Dec 1;87(3):739-49. doi: 10.1002/jbm.a.31773.
Metallic materials having good mechanical properties, high corrosion resistance, and good compatibility with biological materials are used as orthopedic devices. Type 316L stainless steel is the most widely used material for implant fabrication in India for orthopedic applications owing to their good corrosion resistance, hot and cold workability, excellent mechanical properties, and availability at low cost. However, it faces corrosion-related problems in physiological environment and thus releases toxic metal ions into the tissues surrounding the implants. Hence, hydroxyapatite (HAP) coatings over the metal implant have been developed as an alternative method to improve the surface conditions of the base metal. In the present investigation, the development of a sol-gel-derived hydroxyapatite coating on 316L SS is being explored. The corrosion resistance behavior of the coating was assessed through electrochemical studies involving cyclic polarization experiments and impedance analysis in Ringer's solution. The results have indicated that the sol-gel-derived HAP coatings exhibited excellent resistance to localized attack on pristine 316L SS.
具有良好机械性能、高耐腐蚀性以及与生物材料良好兼容性的金属材料被用作骨科器械。316L不锈钢因其良好的耐腐蚀性、冷热加工性、优异的机械性能以及低成本可用性，是印度骨科应用中植入物制造最广泛使用的材料。然而，它在生理环境中面临与腐蚀相关的问题，从而将有毒金属离子释放到植入物周围的组织中。因此，已开发出在金属植入物上涂覆羟基磷灰石（HAP）作为改善贱金属表面状况的替代方法。在本研究中，正在探索在316L不锈钢上通过溶胶 - 凝胶法制备羟基磷灰石涂层。通过在林格氏溶液中进行循环极化实验和阻抗分析的电化学研究来评估涂层的耐腐蚀行为。结果表明，溶胶 - 凝胶法制备的HAP涂层对原始316L不锈钢的局部腐蚀表现出优异的抗性。
