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Abstract：
Surgical ASTM F139 stainless steel is used for temporary fixtures in the biomedical field. Tribocorrosion is a major concern in this application. The aim of the present work was to study the interplay between tribocorrosion behavior and the surface chemistry of the ASTM F139 stainless steel in phosphate-buffered saline solution (PBS). Sliding wear tests were conducted against alumina balls at different electrochemical potentials: open circuit potential (OCP), cathodic potential (-100 mV versus the OCP), and anodic potentials (+200 mVAg/AgCl and +700 mVAg/AgCl). The normal load was 20 N. The wear volume was estimated based on micrographs obtained from the wear tracks using confocal laser scanning microscopy. Moreover, the wear tracks were also examined by scanning electron microscopy (SEM). The surface chemistry of the ASTM F139 specimens was analyzed by X-ray photoelectron spectroscopy (XPS). The wear volume was dependent on the electrochemical potential, being maximized at +700 mVAg/AgCl. Delamination areas and grooves were observed in the wear tracks. Detailed assessment of the surface chemistry inside the wear tracks allowed identification of the main chemical species and their relative quantities, thus enabling correlation of the passive film composition with the observed tribocorrosion behavior.
摘要：
外科ASTMF139不锈钢用于生物医学领域的临时固定装置。摩擦腐蚀是该应用中的主要关注点。本工作的目的是研究摩擦腐蚀行为与ASTMF139不锈钢在磷酸盐缓冲盐溶液（PBS）中的表面化学之间的相互作用。在不同的电化学电势下对氧化铝球进行了滑动磨损测试：开路电势（OCP），阴极电位（-100mV对OCP），和阳极电位（+200mVAg/AgCl和+700mVAg/AgCl）。正常负载为20N。基于使用共聚焦激光扫描显微镜从磨损轨迹获得的显微照片来估计磨损量。此外，还通过扫描电子显微镜(SEM)检查磨损轨迹。通过X射线光电子能谱(XPS)分析ASTMF139样品的表面化学。磨损量取决于电化学电势，在+700mVAg/AgCl时最大化。在磨损痕迹中观察到分层区域和凹槽。对磨损痕迹内部的表面化学进行详细评估，可以识别主要化学物质及其相对数量。从而使钝化膜组成与观察到的摩擦腐蚀行为相关。
