Mechanical surface treatments effects on corrosion of AISI 316 Ti stainless steel in chloride environments

TLDR: In this paper, the effects of various surface treatment techniques such as grinding, garnet blasting, and shot peening on the corrosion rate and behavior of austenite stainless steel of type AISI 316 Ti were investigated using immersion tests and electrochemical impedance spectroscopy together with opticalscanning electron microscopy.

Abstract: The current paper investigates effects of various surface treatment techniques suchas grinding, garnet blasting, and shot peening on the corrosion rate and behaviorof austenite stainless steel of type AISI 316 Ti. The exposure to different corrosivesolutions usually accompanying the coastal and industrial environments (sodiumchloride and ferric chloride), as well as a combination of the two was considered. Thecorrosion behavior of AISI 316 Ti under these test conditions was investigated usingimmersion tests and electrochemical impedance spectroscopy together with opticalscanning electron microscopy, in order to observe and to assess the changes in thesurface configuration and topography such the shapes, distribution, and dimensionsof the resulting pits. The presented results clearly show the relatively higher corrosiveeffect of ferric chloride, and the increased corrosion rate under greater surfaceroughness values, which imply greater real surface area and capillarity effects.