The effect of steel ball diameter variation in dry shot peening process on surface roughness and corrosion rate of AISI 316L implant material

Stainless steel, or also called as inox steel is a material that has a resistivity to the oxide reaction in an oxygen-containing environment. This study uses AISI 316L stainless steel material which is a biomedical implant as a raw material that obtains surface modification technique to obtain new mechanical properties. Surface modification technique uses dry shot peening process by varying steel ball diameter as an abrasive material shot on the surface of steel ball at high speed. The steel ball used is AISI 440 C type with a hardness level of HRC 50-55. The results show that the level of material surface roughness will decrease along with the increasing (bigger) size of steel ball diameter used. The results of corrosion test on SBF solution (simulated body fluid) show an increase in corrosion resistance along with the decreasing (smaller) size of steel ball diameter used. (paper)