Influence of thiourea on the corrosion resistance of mild steel immersed in simulated concrete pore solution

Krishnasamy Vigneswari; Karunaivel Kavipriya; Brintha Arockiasamy Santhiya; Veerapandian Velkannan; Gurmeet Singh; Hashem Abdulhameed Al; Anitha Nilavan; Susai Rajendran; Časlav Lačnjevac

doi:10.5937/zasmat2204447S

Authors

Krishnasamy Vigneswari Sri Meenakshi Government Arts College for Women (Autonomous), PG Department of Chemistry, Madurai, India Author
Karunaivel Kavipriya PSNA College of Engineering and Technology, Department of Chemistry, Dindigul, India Author
Brintha Arockiasamy Santhiya Sri Meenakshi Government Arts College for Women (Autonomous), PG Department of Chemistry, Madurai, India + Sacred Heart College of Arts and Science, Department of Chemistry, Dindigul, India Author
Veerapandian Velkannan Thiagarajar College of Engineering, Department of Chemistry, Thiruparankundram, Madurai, Tamil Nadu, India Author
Gurmeet Singh Pondicherry University, Puducherry, India Author
Hashem Abdulhameed Al Kuwait Institute for Scientific Research, Petroleum Research Centre, Kuwait City, Kuwait Author
Anitha Nilavan Mother Teresa Women's University, St. Antony's College of Arts and Sciences for Women, Corrosion Research Centre, Department of Chemistry, Dindigul, India Author
Susai Rajendran Mother Teresa Women's University, St. Antony's College of Arts and Sciences for Women, Corrosion Research Centre, Department of Chemistry, Dindigul, India + Pondicherry University, Centre for Nanoscience and Technology, Puducherry, India Author
Časlav Lačnjevac University of Belgrade, Faculty of Agriculture, Serbia Author

DOI:

https://doi.org/10.5937/zasmat2204447S

Keywords:

thiourea, corrosion resistance, mild steel, simulated concrete pore solution, electrochemical studies

Abstract

The corrosion resistance of mild steel in simulated concrete pore solution (SCPS) in the absence and presence of thiourea has been investigated by polarization study and AC impedance spectra. Polarisation study reveals that thiourea system functions as anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. When mild steel is used as rebar, thiourea may be mixed with concrete. Thus the mild steel will be protected from corrosion. The protective film consists of iron-thiourea complex formed on metal surface. In the presence of thiourea the linear polarisation resistance increases, corrosion current decreases, charge transfer resistance (Rt) increases, impedance increases, phase angle increases and double layer capacitance (Cdl) value decreases. This formulation may find application in concrete technology.

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