The present research aims at studying two corrosion inhibitors, that is sodium 2-amino-benzoate (2AMB) and sodium glycero-phosphate (GPH), 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 0.1M NaCl, in order to reach pH 7. Polarization curve recording and EIS technique have shown that, after an induction period of about 24h, 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 120h immersions. 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, Cecilia
Primo
;
FRIGNANI, Alessandro
Secondo
;
BALBO, Andrea
Penultimo
;
ZUCCHI, Fabrizio
Ultimo
2011

Abstract

The present research aims at studying two corrosion inhibitors, that is sodium 2-amino-benzoate (2AMB) and sodium glycero-phosphate (GPH), 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 0.1M NaCl, in order to reach pH 7. Polarization curve recording and EIS technique have shown that, after an induction period of about 24h, 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 120h immersions. 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.
2011
Monticelli, Cecilia; Frignani, Alessandro; Balbo, Andrea; Zucchi, Fabrizio
File in questo prodotto:
File Dimensione Formato  
2011-Influence of two specific inhibitors-Mater and Corros.pdf

solo gestori archivio

Descrizione: Full text editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 777.33 kB
Formato Adobe PDF
777.33 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1399864
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 44
  • ???jsp.display-item.citation.isi??? 35
social impact