Abstract

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EVALUATION OF CORROSION AND TRIBOCORROSION BEHAVIOR OF 316L STAINLESS STEEL WITH PHYSICAL VAPOR DEPOSITED PURE TI COATINGS

Zohre Riahi, Sepide Dabaghi, Keyvan Raeissi


The most common stainless steel that is used in orthopedic implant is AISI 316 stainless steel. Stainless steel is extremely susceptible to pit and groove corrosion. One of the common ways of optimizing the biological adaptability, decreasing metallic ion release, and increasing corrosion resistance in body environment of stainless steel is applying coatings on its surface. Pure commercial Titanium is one of the alternatives for using inside body due to its predictable interaction with biological environment. Therefore, the aim of this study is to investigate corrosion and tribocorrosion resistance of 316L stainless steel with titanium PVD coatings inside Ringer’s solutions. Surface characterization analysis revealed thickness of 3.6 µm and hexagonal structure. According to potentiodynamic polarization readings, uncoated and coated specimens showed similar current density but uncoated specimen had higher breakdown potential. The results of tribocorrosion tests at open circuit potential showed a higher potential drop for the coatings due to their more active electrochemical behavior. Optical microscope images and roughness profile graph showed higher groove width and lost mass for coated sample respectively. Thus, our results demonstrated that method of coating and thickness play key roles in improving corrosion and tribocorrosion characteristics of stainless steel coated titanium.