THE EFFECTS OF TEXTURE ON THE CORROSION RESISTANCE OF SS304 STAINLESS STEEL

摘要

Stainless steels are well known for their high corrosion resistance properties. In this paper, the effect of surface texture on the corrosion resistance properties of SS304 stainless steels was investigated. Different surface textures were produced for this study, namely {001 }<100>, {110}<110> and {111}<110>. Electrochemical Impedance Spectroscopy (EIS) was performed to characterize the general corrosion resistance of the stainless steel surfaces. Potentiodynamic polarization was performed to characterize the resistance to localized corrosion (Pitting) of the stainless steel surfaces. The poles figures were measured using x-ray diffraction technique and the orientation distribution functions (ODFs) were calculated using Resmat software. The results showed that surfaces with (111) preferred planes have the highest resistance to general corrosion and pitting. The resistance to general corrosion of the surfaces with (111) preferred planes was 258 Mii.cm~2 compared to 219 MΩ cm~2 and 82 MΩ cm~2 for the surfaces with (001) (respectively (110)) preferred planes. In addition, the pitting potential was found to be 0.46V for (111) textured surfaces compared to 0.29V and 0.15V for (001) (respectively (110)) textured surfaces. It has been shown that the corrosion resistance increased with increasing planar atomic density of the surface.