New material for orthopedic implants: Electrochemical study of nickel free P558 stainless steel in minimum essential medium
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- 作者：Ruth Flavia Vera Villamil Jaimes ; Mó ; nica Luisa Chaves de Andrade Afonso ; Sizue Otta Rogero ; Silvia Maria Leite Agostinho ; Celso Antonio Barbosa
- 关键词：Metals and alloys ; Characterization methods ; Corrosion ; Nickel free P558 stainless steel ; Minimum essential medium ; Orthopedic implants
- 刊名：Materials Letters
- 出版年：2010
- 出版时间：15 July 2010
- 年：2010
- 卷：64
- 期：13
- 页码：1476-1479
- 全文大小：613 K
文摘
Nickel, a component of stainless steels (SS) applied in orthopedic implants may cause allergic processes in human tissues. P558 nickel free SS was studied to verify its viability as a substitute for stainless steel containing nickel. Its performance is compared to ISO 5832-9 and F138 most used nowadays grades in implants fabrications, in minimum essential medium, MEM, at 37 °C. Potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and “in vitro” cytotoxicity were used as techniques. From the electrochemical point of view P558 SS is comparable to ISO 5832-9 SS in MEM. It remains passivated until the transpassivation potential, above which generalized corrosion occurs. F138 presents pitting corrosion at 370 mV/SCE. The cytotoxicity results showed that P558, ISO 5832-9 and F138 do not present cytotoxic character. Therefore, these results suggest that P558 SS can be applied in orthopedic implants.