Enhanced corrosion protection of mild steel by the synergetic effect of zinc aluminum polyphosphate and 2-mercaptobenzimidazole inhibitors incorporated in epoxy-polyamide coatings

Z. Mirzakhanzadeh, A. Kosari, M. H. Moayed, R. Naderi, P. Taheri, J. M.C. Mol

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)
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Abstract

This work investigates the synergetic effect of zinc aluminum polyphosphate (ZAPP) and 2-mercaptobenzimidazole (MBI) on the corrosion protection of mild steel coated with a solvent-borne epoxy-polyamide layer. The magnitude and trend of electrochemical impedance spectroscopy data over 70-d immersion in 3.5 wt.% NaCl solution indicate superior corrosion protection of the combined inhibitors compared to those containing either just ZAPP or MBI. Pull-off tests show that the combined inhibitor system provides an improved adhesion strength. The enhanced corrosion performance is correlated to precipitation of a protective layer at the coating/metal interface verified by SEM and electrochemical studies upon exposure to electrolytes.

Original languageEnglish
Pages (from-to)372-379
JournalCorrosion Science
Volume138
DOIs
Publication statusPublished - 2018

Keywords

  • A. Mild steel
  • B. EIS
  • B. IR spectroscopy
  • B. Polarization
  • B. SEM
  • C. Polymer coatings

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