Electrochemical evaluation of synthesized s-triazine derivatives for improving 316L stainless steel for biomedical applications

316L stainless steel (316L SS) alloy has been broadly used for the fabrication of dental, orthopedic, and cardiovascular implants. As the surface of the stainless steel suffers from corrosion in the human body's environment, a surface modification is required. Self-assembled monolayers (SAMs) perform a simple and efficient method for carrying out surface adaptation of the metallic biomaterials. In this study, synthesized s-triazine dicarboxylic acid derivative and four different s-triazine tetracarboxylic acid derivatives were considered to form SAMs on the 316L SS surface. The formed SAMs were electrochemically evaluated, as corrosion inhibitors for 316L SS in simulated body fluid (SBF) at 37 degrees C by means of potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS). The results revealed that all the studied compounds exhibit good corrosion inhibition and function as mixed-type inhibitors with anodic predominance. The inhibition efficiencies were increased with increasing the concentrations of the solution of s-triazine derivatives, except in case of one compound. The maximum inhibition efficiency (similar to 90%) was obtained for the most efficient compound at 700 ppm. The inhibition was assumed to occur via adsorption on the metal surface. The hydrophobicity of the modified surface was tested by contact angle measurements. The thermodynamic calculations suggested that the adsorption of these compounds on the metal surface is a spontaneous process obeying Langmuir adsorption isotherm. [GRAPHICS] .