Corrosion Behavior of 316L Stainless Steel in Treated and Untreated Artificial Effluent Solutions (AESS)

Abstract

Some organic compounds in wastewaters not only pollute the environment but also cause corrosion to the wastewater transportation systems. In this study the corrosion behavior of treated textile wastewater was investigated by using AISI 316L stainless steel. Treatment was done by sonochemical (US), photochemical (UV) and sonophotochemical (US+UV) processing. These processes were used to degrade the dyestuffs which cause the pollution of textile wastewater. Artificial effluent solutions were prepared for use in the treatment processes. The concentrations of the solutions decreased with time for three treatment processes. The most reduced concentration was obtained after sonophotocatalytic treatment and the least was for sonochemical treatment. The OCP curves were found to move away from the noble direction for all the tested samples. The reduction tendency of the potential values for all samples was observed close to each other. The most active OCP values were for US+UV. In polarization results, the US sample showed a lower corrosion potential and higher corrosion current density. The corrosion results of samples tested in treated solutions were better than in untreated solutions. For the sonophotochemical process, stainless steel showed a better corrosion resistance than the others.