Synthesis and characterizing of MgO, 58S bioactive glass and N carboxymethyl chitosan and coating composites of them on SS316L

One of the most effective ways to solve the problems caused by the presence of steel implants in the body is to apply a coating to them. This study aims to develop and optimize composite coatings of magnesium oxide (MgO), 58S bioactive glass (BG), and N-carboxymethyl chitosan (N-CMC) on stainless steel (SS316L) substrates using the electrophoretic deposition (EPD) method. The synthesized materials were characterized using FTIR, XRD, and SEM to confirm their structure and morphology prior to coating. The coatings were then applied via EPD with varying N-CMC content (50-150 mg), and their effects on the coating's microstructure, morphology, and electrochemical behavior were systematically investigated. The results revealed that the optimum coating, obtained at 8 V for 15 min, exhibited a uniform and crack-free morphology when the N-CS content was increased to 150 mg. Electrochemical tests demonstrated a significant improvement in corrosion resistance, with the sample containing 150 mg of N-CMC showing the highest polarization resistance (89.3 Ω), attributed to the dense and homogenous structure of the coating. The results show that the composite coating can be used as a suitable option for covering bone implants made of 316 stainless steel.