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2022, vol. 63, br. 4, str. 447-453
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Uticaj tiouree na otpornost na koroziju mekog čelika uronjenog u simulirani rastvor betonskih pora
Influence of thiourea on the corrosion resistance of mild steel immersed in simulated concrete pore solution
Shanthy Pooviaha, Kavipriya Karunaivelb, Santhiya Brintha Arockiasamyc, Priyanka Ganesana, Vigneswari Krishnasamya, Velkannan Veerapandiand, Singh Gurmeete, Al-Hashem Abdulhameedf, Nilavan Anithag, Rajendran Susaih, Lačnjevac Časlavi
aSri Meenakshi Government Arts College for Women (Autonomous), PG Department of Chemistry, Madurai, India bPSNA College of Engineering and Technology, Department of Chemistry, Dindigul, India cSri 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 dThiagarajar College of Engineering, Department of Chemistry, Thiruparankundram, Madurai, Tamil Nadu, India ePondicherry University, Puducherry, India fKuwait Institute for Scientific Research, Petroleum Research Centre, Kuwait City, Kuwait gMother Teresa Women's University, St. Antony's College of Arts and Sciences for Women, Corrosion Research Centre, Department of Chemistry, Dindigul, India hMother 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 iUniverzitet u Beogradu, Poljoprivredni fakultet, Srbija
e-adresa: susairajendran@gmail.com
Sažetak
Otpornost mekog čelika na koroziju u rastvoru simuliranih pora betona (SCPS) u odsustvu i prisustvu tiouree je ispitana polarizacionom studijom i spektrom impedanse naizmenične struje. Studija polarizacije otkriva da sistem tiouree funkcioniše kao anodni inhibitor. Spektri impedanse naizmenične struje otkrivaju da se na površini metala formira zaštitni film. Kada se kao armatura koristi meki čelik, tiourea se može mešati sa betonom. Tako će meki čelik biti zaštićen od korozije. Zaštitni film se sastoji od kompleksa gvožđe-tiourea formiranog na metalnoj površini. U prisustvu tiouree raste otpor linearne polarizacije, smanjuje se struja korozije, povećava otpor prenosa naelektrisanja (Rt), raste impedansa, povećava se fazni ugao i smanjuje se vrednost dvostojnog kapacitivnosti (Cdl). Ova formulacija može naći primenu u tehnologiji betona.
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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