Green rare earth compounds as corrosion inhibitors for steel

A. E. Somers, G. Talbi, C. De Bruin-Dickason, S. Hanf, M. Forsyth, G. B. Deacon, P. C. Junk, B. R.W. Hinton

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

1 Citation (Scopus)


SUMMARY: There is an ongoing search for environmentally friendly, highly effective inhibitor compounds that can provide protective action against corrosion in situations ranging from the marine environment to buried oil and gas pipelines. In recent times rare earth organic inhibitors have been investigated as corrosion inhibitors for mild steel in such conditions. These compounds exhibit effective corrosion inhibition, are non-Toxic and, importantly for paint coatings, have limited solubility. Here we present the results of research on a new range of rare earth complexes based on 4-(para-methylphenyl)-4-oxobutyric acid (HPMPOB) as inhibitors for AISI 1020 steel. Cerium, lanthanum, neodymium and yttrium complexes were found to reduce the corrosion rate to varying degrees. Potentiodynamic polarization testing after 30 minutes revealed that the complexes acted as anodic inhibitors, with a shift in the corrosion potential of at least 100mV in the positive direction and a significant reduction in the corrosion current. Surface analysis of the immersed samples revealed the presence of a protective film, suggesting that the inhibiting properties are a result of the formation of a complex film on the mild steel surface.

Original languageEnglish
Title of host publicationCorrosion and Prevention 2016
Subtitle of host publicationAnnual ACA Conference on Corrosion and Prevention 2016; SKYCITY Convention CentreAuckland; New Zealand; 13 November 2016 through 16 November 2016
PublisherAustralasian Corrosion Association (ACA)
Number of pages5
ISBN (Electronic)9781510858541
Publication statusPublished - 1 Jan 2016
EventAustralasian Corrosion Association (ACA) Conference 2016: Corrosion and Prevention - Auckland, New Zealand
Duration: 13 Nov 201616 Nov 2016


ConferenceAustralasian Corrosion Association (ACA) Conference 2016
Abbreviated titleCP 2016
Country/TerritoryNew Zealand


  • Corrosion inhibitors
  • Mild-steel
  • Rare earth complexes

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