Shot peening effects on corrosion behavior of Hydroxyapatite coated AISI 316L Stainless steel alloy for medical implant application

Author:  A. Ahmed, M. Mhaede, M. Wollmann, L. Wagner
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.470-475)
Doc ID:  2014122
Year of Publication:  2014
Abstract:  
The effect of several Almen intensities of shot peening on the corrosion behavior, surface roughness, micro hardness profiles, and residual stresses of stainless steel AISI 316 L were investigated. Hydroxyapatite coating (HA) were applied to shot peened materials to improve their corrosion resistance. The corrosion behaviour were studied using potentiodynamic polarization. The electrochemical tests were performed in HANK solution. The results show that shot peening can be enhancement the mechanical properties (microhardness and residual stresses) and increasing the pitting corrosion on stainless steel 316L. Shot peening generates a rough surface, which is possible one of the causes of decreasing the corrosion resistance of AISI 316L. The deposition of hydroxyapatite over shot peened surface proved the excellent results for stainless steel corrosion.