A study of rare-earth 3-(4-methylbenzoyl)-propanoate compounds as corrosion inhibitors for AS1020 mild steel in NaCl solutions

Yu Peng, Anthony E. Hughes, Glen B. Deacon, Peter C. Junk, Bruce R.W. Hinton, Maria Forsyth, James I. Mardel, Anthony E. Somers

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Abstract

In this work two novel rare-earth (RE) 3-(4-methylbenzoyl)-propanoate (mbp) complexes (RE(mbp)3; RE = La, Y) have been investigated and compared with the well-researched inhibitor, lanthanum 4-hydroxycinnamate (La(4-OHcin)3), for AS1020 mild steel in 0.01 M NaCl solutions. The electrochemical results reveal a high corrosion inhibition performance of Y(mbp)3 which is attributed to the build-up of a protective surface film with a high level of corrosion resistance particularly after 24 h. Surface analyses indicate that the metal surface is protected during the immersion in Y(mbp)3-inhibited solutions and the presence of Y is confirmed on the substrate surface.

Original languageEnglish
Pages (from-to)199-211
Number of pages13
JournalCorrosion Science
Volume145
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Corrosion inhibition
  • EIS
  • Mild steel
  • Polarisation
  • Rare-earth carboxylate
  • SEM

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