INVESTIGADORES
VALCARCE Maria beatriz
artículos
Título:
Inhibiting Steel Corrosion in Simulated Concrete with Low Phosphate to Chloride Ratios
Autor/es:
L. YOHAI; W. SCHREINER; M. B. VALCARCE; M.VÁZQUEZ
Revista:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Editorial:
ELECTROCHEMICAL SOC INC
Referencias:
Año: 2016 vol. 163 p. 1 - 9
ISSN:
0013-4651
Resumen:
Phosphate ions are studied as corrosion inhibitors in pore simulating solutions highly contaminated with chloride ions. The investigationaims at understanding the role of phosphates in the corrosion inhibition mechanism, employing potentiodynamic polarizationtests, micro-Raman spectroscopy, impedance spectroscopy, X-ray photo electronic spectroscopy (XPS) and weight loss tests. Twoinhibitor/chloride ratios were assessed, [PO43−]/[Cl−] = 0.2 and 0.6. When [PO43−]/[Cl−] = 0.6, pitting is inhibited, even after90 days exposure. [PO43−]/[Cl−] = 0.2 only delayed the onset of localized attack. XPS showed that phosphates incorporate to thesurface film. Phosphate ions behaved asmixed-type corrosion inhibitors. The results are interpreted by the participation of phosphatesin the duplex passive film being formed on carbon steel.