SURFACE MODIFICATION OF STAINLESS STEEL INTRAMEDULLARY NAILS TO IMPROVE ADHESION OF POLYMERIC COATINGS

摘要

The aim of the study was to develop a method of surface modification of steel AISI 316L to improve polymeric coatingsadhesion. Two methods were used: etching by solution of H_2SO_4 and H_2O_2 "piranha" and cathodic sputtering. The change ofthe surface topography and chemical composition were analyzed using optical profilometer and scanning electron microscope.The impedance electrochemical method and polarization method were used for corrosion resistance measurement. The scratchtest was performed to assess adhesion of the polymer to the steel. The results show that after both modifications the surfaceoughness and polymer adhesion increase. However, significant decrease of steel corrosion resistance were observed afteretching. In comparison the cathodic sputtering had a small influence on corrosion resistance of the steel.