Performance evaluation of phosphite NaCo(H2PO3)3·H2O as a corrosion inhibitor for aluminum in engine coolant solutions

M. A. Deyab, R. Essehli, B. El Bali

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The inhibiting action of a novel inorganic compound (NaCo(H2PO3)3·H2O) (NaCoPh) synthesized in our laboratory on the corrosion of aluminum in engine coolant solutions has been studied. In this study, potentiodynamic polarization measurements with SEM/EDX investigations were employed. Polarization curves reveal that NaCoPh is a mixed type (cathodic/anodic) inhibitor for aluminum corrosion in the engine coolant solution. The inhibition efficiency increases with increasing concentration of NaCoPh but decreases with increasing temperature and flow rate. SEM/EDX investigations reveal the adsorption of NaCoPh on the aluminum surface. A mixed adsorption (physisorption and chemisorption) for NaCoPh was proposed.

Original languageEnglish
Pages (from-to)48868-48874
Number of pages7
JournalRSC Advances
Issue number60
Publication statusPublished - 1 Jan 2015


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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