316L stainless steel is widely used in medical devices and even long-term implants, such as vascular stents, because of its good mechanical properties, good biocompatibility, and relatively rugged environment-resistant corrosion resistance. However, in recent years, there have been reports that the enrichment of dissolved metal ions in the human body in 316L has adverse effects on the human body. Various surface technologies have been widely used in the modification of the metal materials. The authors have extensively studied a variety of surface prior to Schlumberger. . Principles and Applications of AC Impedance Spectroscopy. Beijing, Tianfang Industrial Press.
(Continued on page 2362) Polarization curves of titanium oxide films in Hanks solution Fig. Electrochemical impedance is a method for effectively studying the electrochemical mechanism of thin film corrosion The corrosion in the Hanks solution is a typical barrier coating model, ie, a corrosion-resistant protective film with microscopic pores. This denser film can effectively prevent the solution from reaching the metal matrix, thereby reducing the corrosion rate. The solution resistance of the sample to the reference electrode in the corrosion system reflected in the high frequency region is the same, but the corrosion reaction resistance and the sheet resistance reflected in the low frequency region change with the process, and the samples 1 and 2 reflect a lower response at a low frequency. The resistance and the large phase difference confirm that it has a relatively high corrosion current, while the 3 samples exhibit a very low corrosion resistance and thin film resistance, resulting in the lowest corrosion current, which is mainly due to the close to the stoichiometric ratio of 3 titanium oxide. The membrane has a lower porosity and a more stable energy state.
In addition, from the phase difference can also be seen, the titanium oxide film deposition 316L has a significantly lower than the natural corrosion current density of the 316L substrate, the synthetic film can effectively reduce the corrosion rate of the surface modified metal in the human body, 3 samples have More dense structure, lower microporosity. Mater. Sci.: Mater. Med., 1994, 5, 252-5. Polyamide Resin Handbook. Beijing: China Petrochemical Press, 1994, 60-84. Deng Rusheng, Wei Yunfang, Chen Buning. Polyamide resin and its application. Beijing: Chemical Industry Press, 2002: 82. Wang Yizhong, Rong Jianhua, Yu Yusheng... Application of Engineering Plastics, 2000, 28(2): 9-11. Zhu Jingan, Wang Lijun, Jiang Mingcai...... From Molecular Materials Science and Engineering , 1999, 15(1): 76-79. Feng Xiaoyin, Zhang Jinhong, Liang Guomei. J. Journal of Sun Yat-sen University (Natural Science Edition), 1996, 35(1):58-63. (Continued from page 2359)
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