Influence of Chloride Ions on Electrochemical Corrosion Behavior of Dual-Phase Steel over Conventional Rebar in Pore Solution

Hany S. Abdo,Asiful H. Seikh,Jabair A. Mohammed,Saud M. Almotairy,Sameh A. Ragab,Monis Luqman

doi:10.3390/app10134568

Hany S. Abdo, Asiful H. Seikh + Show 4 more

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https://doi.org/10.3390/app10134568

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Journal: Applied sciences	Publication Date: Jun 30, 2020
Citations: 14	License type: CC BY 4.0

Affiliation: King Saud University, Aswan University

Abstract

Reinforced steel bars (rebar) are extensively used in construction, and the main challenge is in minimizing corrosion due to oxide or passive layer breakdown. In contrast, dual-phase (DP) steel has good corrosion resistance. This study investigated the effect of Cl− ions on the electrochemical corrosion behavior of DP rebar and conventional rebar. Corrosion behavior studies and electrochemical measurements were conducted on DP rebar and conventional rebar in simulated concrete pore solution with different concentrations of Cl− ions. Microstructure analysis, surface morphology analysis, and corroded surface characterization were performed using optical microscopy, field emission scanning electron microscopy, and Raman spectroscopy, respectively. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed that DP rebar has good passivity, leading to better corrosion resistance and greater strength compared to ordinary rebar. In addition, DP rebar showed better passivity behavior compared to conventional rebar in alkaline solution. Therefore, the presence of a dual phase (ferrite and martensite) in reinforced concrete structured steel induces good corrosion resistance.

Highlights

Because of their durability and versatility, reinforced steel bars are extensively used in construction
This study investigated the effect of Cl− ions on the electrochemical corrosion behavior of DP
We successfully developed a high-performance rebar microstructure from compared to DP rebar

Summary

Introduction

Because of their durability and versatility, reinforced steel bars (rebar) are extensively used in construction. Corrosion of rebar leads to cracks and spalling on the surface, affecting the safety and durability of reinforced concrete. The apprehension about chloride-induced corrosion has motivated researchers to focus on carbon materials, such as carbon steel, as reinforcement for concrete. To calculate the required chloride percentage for passivation, three methods are used: the total chloride amount in weight percent Different methods are used to measure the chloride content percentage, such as electrochemical impedance, potentiodynamic polarization, gravimetric measurement [2,3,4,5,6,7,8,9,10,11]

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