Influence of Roughness on Corrosion Resistance of Carbon Steel SAE 1020 and DOMEX^® 700 MC Steel

Abstract

The aim of this study was to investigate and compare the relationship between corrosion resistance and roughness in the samples of carbon steel SAE 1020 and DOMEX® 700 MC steel. Surfaces with different roughnesses were compared. The metal alloys were analyzed via electrochemical impedance spectroscopy (EIS), anodic potentiodynamic polarization (APP), roughness tester and scanning electron microscopy (SEM). It was observed that the samples exhibited different behavior with respect to corrosion resistance, according to the surface conditions and materials that were tested. The lowest roughness values represented the best results in the electrochemical tests. The samples of carbon steel with lower maximum depth of valleys (Rv) showed the best protection properties compared to other samples.

Effect of Welding Methods on Mechanical Properties of Domex 700MC Steel

“…Gas metal arc welding (GMA) and laser beam welding (LB) are two of the most frequent welding processes used on Domex 700MC steel. Each of these techniques can generate different rates of heating and cooling, heat input and distortion, all of which can alter the mechanical properties of the steel [2,3]. The core problem is the formation of the coarse-grained microstructure in the HAZ during welding, after the rapid cooling from high temperatures.…”