Abstract
Dual-phase (DP) steels consist of a ferritic matrix dispersed with some percentage of martensite, which gives the material a good combination of strength and ductility, along with the capacity to absorb energy and enhanced corrosion protection properties. The purpose of this work was to study the microstructural and corrosion behavior (mainly pitting and galvanic corrosion) of DP steel compared with that of conventional rebar. To obtain DP steel, low-carbon steels were heat-treated at 950 °C for 1 h and then intercritically annealed at 771 °C for 75 min, followed by quenching in ice-brine water. The corrosion rates of DP steel and standard rebar were then measured in different pore solutions. Macro- and microhardness tests were performed for both steels. It was found that DP steels exhibited a superior corrosion resistance and strength compared to standard rebar. The reported results show that DP steels are a good candidate for concrete reinforcement, especially in aggressive and corrosive environments.
Highlights
Steel is mankind’s most eminent structural material and has led to technological breakthroughs in different fields, including safety, energy, automobiles, and construction
A differential thermal analysis of the as-received material was performed with heating from 55 to 975 ◦ C at 15 ◦ C/min using a DT-40 thermal analyzer (Shimadzu, Japan) to determine intercritical ranges such as the AC1 and AC3 temperatures. α-Al2 O3 was used as the reference material
Steel occurs at any potential that is higher than the free corrosion potential in the case of low carbonate/bicarbonate concentrations because there is no chance of passivation
Summary
Steel is mankind’s most eminent structural material and has led to technological breakthroughs in different fields, including safety, energy, automobiles, and construction. Due to their durability and versatility, reinforced steel bars (rebars) are used extensively in construction. The main objective is to optimize the different conditions in order to generate a Cl% that initiates pitting. It has been reported by different researchers that the Cl% varies according to numerous variables and parameters. Li and Sagüés [3] showed that the critical Cl% was somewhere between 0.01 and 0.04 M in saturated calcium hydroxide, while that concentration reached 0.4–0.6 M in a simulated concrete pore solution
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