Effect of various dual-phase heat treatments on the corrosion behavior of reinforcing steel used in the reinforced concrete structures

Abstract

In this study, corrosion behavior of six different dual-phase (DP) steels with varying morphologies and martensite content has been examined in comparison to ferrite-pearlite steel in concrete. Intercritical annealing and intermediate quenching heat treatments have been applied to the reinforcing steel in order to obtain DP steels with different morphologies and content of martensite. Corrosion experiments were conducted in two stages. In the first stage, the corrosion potential of steels embedded in concrete was measured every day for a period of 30 days in accordance with ASTM C 876 standard. In the second stage, anodic and cathodic polarization values of these steels were obtained and then the corrosion currents were determined with the aid of cathodic polarization curves. It has been observed that both the amount of martensite and the morphology of the phase constituents have definite effect on the corrosion behavior of DP steel embedded in concrete. As a result of this study, it is found that corrosion rate of dual-phase steel has increased with increase amount of martensite.

Intercritical Heat Treatment Temperature Dependence of Mechanical Properties and Corrosion Resistance of Dual Phase Steel

“…Bhagavathi et al 2 studied the mechanical properties and corrosion behavior of dual-phase steels and found that by increasing the martensite volume fraction (MFV), the UTS of dual-phase steels increased and corrosion rate of DP steel samples marginally decreased compared to that for the low alloy steel sample. Kelestemur et al 11 showed that the corrosion rate of dual phase steel has increased with increasing the amount of martensite. Sarkar et al 6 studied the electrochemical behavior of microalloyed dual phase steels and found that an increase in martensite content and structural refinement, decreases the corrosion resistance.…”

Effect of Saline Medium on Corrosion and Erosion-Corrosion of Surface Treated Low Carbon Steel

“…In the case of carbonitriding treatment, a higher resistance is evident when compared to the above cases, dueto the forming of iron nitrate onthe surface, and followed by a cementite layer at the grain boundaries which forms a thick surface protection layer with a gradient hardness [11].…”

Recommended practice for reporting experimental data produced from studies on corrosion of steel in cementitious systems

“…Several reports have indicated that both the chemical composition and the microstructure of the reinforcing steel have an impact on its corrosion performance, even within the type of steels typically denoted "mild steel" or "carbon steel" [3][4][5][6][7][8]. Thus, it is important to adequately report the relevant information.…”