Corrosion resistance of mild steel in simulated concrete pore solution before and after a paint coating

• S.C. Joycee¹, T. Vidya¹, S.A. Rattihka¹, B.S. Prabha¹, R. Dorothy², T. Sasilatha² and S. Rajendran^1,3

¹ Corrosion Research Centre, Department of Chemistry, St. Antony’s College of Arts and Sciences for Women Thamaraipadi, Dindigul – 624005 (Affiliated to Mother Teresa Women’s University, Kodaikanal), Tamil Nadu, India
² Department of EEE, AMET University, Kanathur, East Coast Road, Chennai, India
³ Adjunct Professor, Pondicherry University, Puducherry, India

Abstract: In reinforced concrete, mild steel can be used because, mild steel is relatively less expensive. Mild steel in concrete structures may undergo corrosion. To prevent corrosion of mild steel several inhibitors are used along with concrete admixtures. In this type of research, saturated calcium hydroxide solution, which is considered as simulated concrete pore solution (SCPS) is used. Many corrosion inhibitors have been used in this field along with organic coatings. In the present study Asian guard red paint (AGRP) coated mild steel has been used in concrete. The corrosion resistance has been measured by electrochemical studies such as polarization study and AC impedance spectra. In presence of paint coating the corrosion resistance of mild steel immersed in simulated concrete pore solution (SCPS) increases. This is confirmed by the facts that in presence of paint coating the corrosion resistance of mild steel immersed in simulated concrete pore solution (SCPS), the linear polarization resistance value increases, corrosion current value decreases, charge transfer resistance increases, double layer capacitance decreases, impedance increases, and phase angle increases. The protective layer functions as anodic inhibitor and controls the anodic reaction predominantly. It implies that the paint coated mild steel can be used in concrete technology.

Keywords: simulated concrete pore solution, mild steel, paint coating, corrosion inhibition, electrochemical studies

Int. J. Corros. Scale Inhib., 2021, 10, no. 3, 1323-1335
doi: 10.17675/2305-6894-2021-10-3-28

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