Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 233, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117200
Keywords
Carbon steel; Phosphate; Solution pH; Chloride contamination; Passivation
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In this work, the impact of pH on the corrosion inhibition of carbon steel by phosphate ions in solutions with different contaminations of chloride ions (1, 10, and 100 mmol L-1) with 1:1 phosphate to chloride molar ratio was investigated using electrochemical methods including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Moreover, the electrochemical results were complemented using surface analysis methods, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectroscopy, and Fourier transform infrared (FTIR) spectroscopy. The obtained results showed that at the passivation pH (pH), the corrosion state changes from active to passive. The value of pHp decreases with an increase in the concentration of phosphate ions and the protection against both uniform and pitting corrosion in the long term was improved. The phosphate inhibition on the carbon steel surface processed through the formation of a duplex layer, including iron (hydro)oxides (inner part) and iron phosphate complexes (outer part). (C) 2019 Elsevier Ltd. All rights reserved.
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