THE ELECTROCHEMICAL BEHAVIOR OF Zn–Mn ALLOY COATING IN CARBONATED CONCRETE SOLUTION

S. Touazi, M. Bučko, L. Makhloufi, A. Legat and J. B. Bajat
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S. Touazi: Laboratoire d’Electrochimie, Corrosion et de Valorisation Energétique (LECVE), Faculté de Technologie, Université de Bejaïa, 06000 Bejaia, Algeria
M. Bučko: #x2020;Military Academy, University of Defence, P. J. Sturma 33, 11000 Belgrade, Serbia
L. Makhloufi: Laboratoire d’Electrochimie, Corrosion et de Valorisation Energétique (LECVE), Faculté de Technologie, Université de Bejaïa, 06000 Bejaia, Algeria
A. Legat: #x2021;Slovenian National Building and Civil Engineering Institute, Dimičeva ulica 12, 1000 Ljubljana, Slovenia
J. B. Bajat: #xA7;Faculty of Technology and Metallurgy, University of Belgrade, P. O. Box 3503, 11000 Belgrade, Serbia

Surface Review and Letters (SRL), 2016, vol. 23, issue 04, 1-10

Abstract: In order to improve the protective performance of Zn coating on reinforcing steel in concrete, the electrochemical deposition of Zn–Mn coatings was conducted on steel surface. The morphology, chemical and phase compositions of Zn–Mn coatings obtained from sulfate–citrate bath were investigated in the first part of paper. In the second part, the obtained deposits were tested in solution simulating carbonated concrete, consisting of NaHCO3 and Na2CO3. Data obtained from Tafel analysis showed higher corrosion resistance for Zn–Mn alloy deposits obtained at –1700 and –1800mV versus SCE, when compared to pure Zn deposit. Impedance spectroscopy investigations revealed that the total impedance of Zn–Mn coatings increased steadily with time, and was significantly higher as compared to pure Zn after 24h in corrosion solution. On the contrary, for pure Zn, the impedance increased in the first 12h, and then decreased during prolonged exposure time, which can be explained by rapid growth of nonprotective white rust and the degradation of zinc coating, as was confirmed by optical microscope after 24h of immersion in carbonated concrete pore solution.

Keywords: Zn–Mn coating; electrodeposition; sulfate–citrate bath; carbonation of concrete; corrosion protection (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X1650030X

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