Corrosion resistance and mechanical characteristics of dual-phase steel B500c, after shot blasting processes

Abstract

Purpose Corrosive agent constitutes a major problem for constructions located in coastal areas, since it keeps affecting their durability. This phenomenon, in synergy with moisture and high temperatures, leads to premature deterioration of the structures. Under these conditions, the need for management of the problem of resistance of steel against corrosion is an issue of paramount importance and a challenge to the structural integrity and reliability. The paper aims to discuss these issues. Design/methodology/approach The need for management of the problem of resistance of steel against corrosion is an issue of paramount importance and a challenge to the structural integrity and reliability. In the present study, an effort was made to increase the corrosion resistance of the high strength and ductility dual-phase steel B500c category, with the use of different shot blasting processes, without any interference in the chemical composition or in the production mode. In particular, shot blasting treatment was used for both cleaning and creating compressive stresses on the surface of steel bars, according to the pertinent protocols. The modified samples were studied via both conventional characterization methods and electrochemical techniques. Findings Through the whole surface treatment process of B500c steel, a positive impact came about not only the corrosion resistance, but also the mechanical performance. Originality/value Shot blasting process aims to increase the corrosion resistance of high ductility dual-phase steel (B500c), without any interference in the chemical composition or in the production mode.

Mechanical behavior of steel reinforcement before and after flame spray coating in marine environment

“…The results of the experimental work are summarised in the aforementioned Figures 4, 5 and 6. In particular, the outcomes are demonstrated forthwith with results from previous experimental studies, in comparison to the shot blasting process [22][23].…”

The Effect of Shot Blasting Process on Mechanical Properties and Anti-Corrosive Behavior of Steel Reinforcement

“…Hence, in the present manuscript, that group of specimens is referred as CSB (Coated and Shot Blasted). As has been indicated in previous scientific studies [15,16,22], the shot blasting process may have impact on the mechanical behavior of materials, while the coating material can enhance their anticorrosive behavior.…”

“…In detail, the angular particles are suitable for removing the surface impurities from the corroded steel surfaces, whereas the spherical particles smooth the rough external surface of the steel reinforcing bars. In the present manuscript, considering the encouraging results of previous studies of the authors [15,16,22], the additional use of fused brown alumina was proposed, since its angular geometry increases the expectations for better abrasion and subsequently better mechanical performance of the reinforcing bars.…”

“…Figure 4 shows current-potential curves for the reference and the shot blasted with corundum specimens, in comparison with previously extracted plots of shot blasted specimens with olivine, olivine and glass beads, and sinter ball [15,16]. The process of cleaning was carried out according to the parameters of Table 2.…”

“…For instance, Voorwald et al [14] carried out shot blasting for AISI 4340 steel through cast steel shots, and the results showed that these shots can significantly improve corrosion resistance and fatigue life of target material. Drakakaki et al [15,16] reported that the shot blasting treatment process of B500c steel had a positive impact on not only the corrosion resistance, but also the mechanical performance.…”