Surface Characteristics and Corrosion Behavior of Carbon Steel Treated by Abrasive Blasting

Abstract

The effects of blasting with metallic steel grit and non-metallic alumina grit on steel surface characteristics were evaluated. These abrasives are generally used at construction sites and in vacuum blasting. Milled steel specimens were used to investigate the effect of the blasting conditions on surface properties. The effect of difference in surface properties on the adhesion strength and corrosion behavior were measured through adhesion tests, polarization curves, and electrochemical impedance spectroscopy. The limitations of blasting were evaluated using corroded steel specimens, as were the effects of corrosion products, salts, and abrasive material remaining on the blasted steel surface on the adhesion and corrosion resistance of paint. Steel grit more effectively increased the surface roughness than alumina grit; however, with both abrasive materials, the roughness increased with the blast projection angle. However, in the case of alumina grit, some abrasive material remained on the surface; thus, the actual roughness not including the residual abrasive material was more complex and greater than that of the sample blasted with steel grit. According to the adhesion strength test of painted and unpainted specimens, the adhesion force improved with increasing surface roughness and residual abrasive materials. Further, surface roughness was linearly correlated with the adhesion strength of unpainted specimens for both abrasive materials with blasting, and the adhesion strength force with alumina grit was approximately 1.4 times higher than that with steel grit, suggesting that increased roughness and residual abrasive material could benefit adhesion. According to the electrochemical test results, lower roughness and increased residual abrasive material owing to alumina grit on the steel surface enhanced the surface corrosion resistance, confirming the benefit of residual materials. Grinding left behind corrosion products and salts under the steel, resulting in the recurrence of rusting. However, the residue from blasting with alumina suppressed corrosion, thus improving the adhesion and corrosion resistance of the paint.

The Influence of Different Type Materials of Grit Blasting on the Corrosion Resistance of S235JR Carbon Steel

“…Carbon steel S235JR is a material mainly intended for the construction of industrial and residential facilities, parts of power transmission towers, equipment elements, offshore structures, car bridges, oil, and gas platforms, as well as other structures [2]. It presents advantages, such as good mechanical resistance and extremely low cost, compared to other types of materials [3,4]. The main disadvantage of these types of materials is their tendency to corrode, which limits their applications [5,6].…”

“…At the same time, the corrosion under the coating often progresses locally, leading to the collapse of the structures in some cases or to the breaking of the steel elements [4].…”

“…Therefore, the surface treatment method before applying anticorrosive coatings is crucial for protecting steel structures against corrosion [4]. In this work, quartz was used as a material for sandblasting because it is a material that consists mainly of quartz (which is a durable crystal) that allows for efficient sandblasting, it is also cheap and very easy to find compared to other types of materials.…”