Improved Corrosion Resistance of 316L SS by Duplex Coating Consisting of a Cerium-Based Layer and a Stearic Acid Film

In this study, a multifunctional composite coating for 316L SS was developed. The main objectives were to improve the corrosion resistance of the substrate in simulated physiological fluids and to impart antibacterial properties to the material. Cerium salicylate-based coatings were produced by electrodeposition and further modified with silver nanoparticles. A hydrophobic duplex coating was formed by post-treatment with stearic acid, significantly improving the corrosion resistance of the substrate in Ringer’s solution. Antibacterial tests of the duplex coating against Escherichia coli and Staphylococcus aureus showed a considerable inhibition zone for both bacteria. The proposed duplex coating not only increases the corrosion resistance of the substrate, but also inhibits bacterial growth and exhibits impressive hydrophobic properties. Consequently, this study could represent a significant advance in developing coatings for 316L SS that offer excellent long-term corrosion resistance, antibacterial activity, and hydrophobic properties for stent applications.