Authors : Hussein Sabea Amnas, Murtdha Adhab Siyah, Rostam Moradian and Iraj Manouchehri
Abstract: This study aimed to increase the corrosion resistance of Stainless Steel 316L (SS316L) alloy used in surgical implants and biomedicine by coating the alloy with nanogold layers. The morphology, particles size and thickness of the gold coating were investigated by Scanning Electron Microscopy (SEM). Results showed that the homogeneity of the coating layer increased after heat treatment. Cross-section SEM images revealed that the SS316L alloy substrate was coated with a gold layer having a thickness of 1.46-2.34 μm. The particle size of the gold coating was <20 nm and prepared by direct-current magnetron sputtering. X-ray diffraction analysis of the samples coated with nanogold after heat treatment showed that the coating layers were crystalline and that the diffraction peaks can be indexed to the face-centred cubic crystalline phase of Au. Finally, results of the potentiodynamic polarisation curves of SS316L samples coated with gold layer showed high resistance to corrosion. The corrosion rate decreased and the sample exhibited noble behaviours and highest resistance to ion attack in SBF (Hank’s solution) than SS316L alloy without coating. The sample with the highest resistance to corrosion in SBF was the one coated with gold having a thickness of 2.34 μm after heat treatment at 500°C.
Hussein Sabea Amnas, Murtdha Adhab Siyah, Rostam Moradian and Iraj Manouchehri, 2019. Increased Corrosion Resistance of Stainless Steel 316l Coated with Nanogold Layers in Simulated Body Fluid (Hank’s Solution). Journal of Engineering and Applied Sciences, 14: 789-795.