CORROSION BEHAVIOR OF ANNEALED STAINLESS STEEL MESH IN DIFFERENT ELECTROLYTES

Abstract

The aim of this study was to investigate the corrosion behaviour of annealed stainless steel mesh. Thermal oxidation treatments were applied to steel mesh in a muffle furnace at 500 ᵒC, 700 ᵒC and 900 ᵒC. Surface morphology of annealed and non-annealed stainless steel meshes was compared before and after polarization. Roughness of the steel surface was increased after heat-treatment. The corrosion properties of non-annealed and annealed steel were determined using linear sweep voltammetry. The corrosion behaviour of annealed stainless steel was examined by means of a potentiostat in a 3.5 wt.% NaCl, 1 M H2SO4 and 1 M KOH electrolytes. The corrosion susceptibility of heat treated stainless steel was more than that of non-heat treated stainless steel in alkaline electrolyte. While pitting corrosion of non-annealed and annealed stainless steel was different, corrosion potential and current of steel mesh without heat treatment was the same as the steel meshes annealed at 500 ᵒC and 700 ᵒC. Corrosion current and corrosion potential of non-annealed steel was the same as 500 ᵒC annealed steel mesh in acidic medium.

Keywords

• korozyon
• paslanmaz çelik
• isıl i̇şlem
• isıl oksidasyon
• corrosion
• stainless steel
• heat-treatment
• thermal oxidation