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Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides
The present research aims at studying two corrosion inhibitors, that is sodium AMB (2-amino-benzoate) and sodium GPH (glycero-phosphate), in a synthetic solution simulating the composition of the pore solution in a carbonated concrete, containing chlorides. Tests have been performed to verify if the simultaneous use of the two substances is compatible and if their addition can efficiently hinder the corrosion attack in the presence of both chlorides and carbonation. The synthetic solution has been prepared by bubbling carbon dioxide through a saturated (and filtered) solution of Ca(OH)2, containing 0.1 M NaCl, in order to reach pH 7. Polarization curve recording and EIS (electrochemical impedance spectroscopy) technique have shown that, after an induction period of about 24 h, the highest inhibiting efficiencies are obtained by mixtures of the two additives at the concentration of 0.05 M, which still produce high inhibiting efficiencies (87 %) at the end of 120 h immersion. At the end of this exposure period, also more diluted symmetric mixtures (0.025 M and 0.01 M) exhibit comparable efficiencies.The analysis of EIS spectra gives interesting information concerning the inhibiting mechanism of the studied mixture.
Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides
The present research aims at studying two corrosion inhibitors, that is sodium AMB (2-amino-benzoate) and sodium GPH (glycero-phosphate), in a synthetic solution simulating the composition of the pore solution in a carbonated concrete, containing chlorides. Tests have been performed to verify if the simultaneous use of the two substances is compatible and if their addition can efficiently hinder the corrosion attack in the presence of both chlorides and carbonation. The synthetic solution has been prepared by bubbling carbon dioxide through a saturated (and filtered) solution of Ca(OH)2, containing 0.1 M NaCl, in order to reach pH 7. Polarization curve recording and EIS (electrochemical impedance spectroscopy) technique have shown that, after an induction period of about 24 h, the highest inhibiting efficiencies are obtained by mixtures of the two additives at the concentration of 0.05 M, which still produce high inhibiting efficiencies (87 %) at the end of 120 h immersion. At the end of this exposure period, also more diluted symmetric mixtures (0.025 M and 0.01 M) exhibit comparable efficiencies.The analysis of EIS spectra gives interesting information concerning the inhibiting mechanism of the studied mixture.
Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides
Monticelli, C. (Autor:in) / Frignani, A. (Autor:in) / Balbo, A. (Autor:in) / Zucchi, F. (Autor:in)
Materials and Corrosion ; 62 ; 178-186
2011
9 Seiten, 14 Bilder, 2 Tabellen, 28 Quellen
Aufsatz (Zeitschrift)
Englisch
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