SHOT PEENING EFFECT ON SURFACE PROPERTIES AND PITTING CORROSION RESISTANCE OF BIOMEDICAL STRUCTURAL STEEL AISI 316L

AISI 316L is used in biomedical engineering as bone implant materials. The mechanical properties and corrosion resistance of this material can be improved by shot peening. The aim of this research is to investigate the effect of shot peening on surface roughness, hardness, wettability, and pitting corrosion resistance of AISI 316L in 0,9 % NaCl solution. The shot-peening was performed on AISI 316L surfaces with duration of 0, 2, 4, 10, 20, 30 minutes using steel balls with a diameter of 0,6 mm and hardness of 40 - 50 HRC. The results show that shot peening increase roughness after 2 minutes then decrease the roughness with increasing time. The longer duration of shot peening will increase the pitting corrosion resistance.