Effect of Magnetic Abrasive Finishing on the Corrosion Behavior by Agricultural Pesticides Corrosive Media

Abstract

This study investigates the effects of surface quality obtained by Magnetic Abrasive Finishing process (MAF) on the amount of chemical corrosion created by agricultural pesticides. MAF is a relatively new method of finishing which uses a magnetic field to control the abrasive tools. In this study, samples from two types of AISI304 stainless steel and brass 6337 were finished with silicon carbide abrasives having various meshes at three different levels of surface roughness as compared to the control part; the first level was rougher than the control part (400 mesh) and the other two levels were smoother from the control part (Mesh 800 and 1200). The migration rate of metal ions was measured to determine the corrosion rate of samples in terms of ppm by the atomic absorption device in two corrosive environments consisting of Paraquat and Deltamethrin pesticides. The results indicate that, when both pesticides are used, reducing the surface roughness improves the corrosion resistance of samples. In summary, the samples finished with 1200 mesh had the best improvement in increasing the corrosion resistance in both steel and brass (36.11% and 34.85%), respectively. The finished samples with 800 meshes also increased corrosion resistance of AISI 304 and brass 6337 up to 20.54% and 15.72%, respectively. It was also found that the corrosion rate of Paraquat solution was about 4.68 times higher than that of Deltamethrin in the same concentration for both of the working materials. The corrosion rate of brass was also higher than that of steel.