Macedo Marcelo de Matos, Tercini Marcela Bergamaschi, Antunes Renato Altobelli, Oliveira Mara Cristina Lopes de
Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Santo André 09210-580, SP, Brazil.
Materials (Basel). 2024 May 13;17(10):2295. doi: 10.3390/ma17102295.
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 mV and +700 mV). 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.
外科用ASTM F139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一个主要问题。本工作的目的是研究在磷酸盐缓冲盐水溶液（PBS）中ASTM F139不锈钢的摩擦腐蚀行为与表面化学之间的相互作用。在不同的电化学电位下对氧化铝球进行滑动磨损试验：开路电位（OCP）、阴极电位（相对于OCP为-100 mV）和阳极电位（+200 mV和+700 mV）。法向载荷为20 N。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估计磨损体积。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ASTM F139试样的表面化学。磨损体积取决于电化学电位，在+700 mV Ag/AgCl时最大。在磨损轨迹中观察到分层区域和沟槽。对磨损轨迹内部表面化学的详细评估允许识别主要化学物种及其相对数量，从而能够将钝化膜成分与观察到的摩擦腐蚀行为相关联。
