Corrosion inhibition of steel in naturally-aerated chloride solution by rare-earth 4-hydroxycinnamate compound

T. D. Manh, P. V. Hien, Q. B. Nguyen, T. N. Quyen, B. R.W. Hinton, N. D. Nam

Research output: Contribution to journalArticlepeer-review

Abstract

The rare-earth organic compound Gadolinium 4-hydroxycinnamate (Gd(4OHCin)3) was characterized and shown to be an effective corrosion inhibitor for mild steel in naturally-aerated 0.1 M chloride solution, not only of general corrosion but also of pitting corrosion. As the inhibition content increased, the corrosion inhibition efficiency increased, up to 94% at concentration of 0.93 mM inhibitor. The results also indicate that Gd(4OHCin)3 behaves as a mixed inhibitor but more predominantly as an anodic inhibitor. The inhibition is attributed to the formation of a protective film layer which acts as a barrier layer on the steel surface. The infrared spectra also confirm a synergetic inhibition mechanism by rare earth and organic components of Gd (4OHCin)3, which depends on inhibitor concentration and immersion time.

Original languageEnglish
Pages (from-to)177-189
Number of pages13
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume103
Issue numberOctober
Early online date2 Aug 2019
DOIs
Publication statusPublished - Oct 2019

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