Investigating the effect of solution pH on speciation of La(4OH-Cin) 3 with correlation to electrochemical behaviour and corrosion efficiency

Marianne Seter, M. Forsyth, B. Hinton

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

The nature of the species in solution plays a major role on the effectiveness of the corrosion inhibitor on a steel substrate. The speciation of lanthanum 4-hydroxy cinnamate (La(4OH-Cin) 3) in solution has been evaluated using experimental techniques composed of potentiodynamic polarisation, immersion tests, nuclear magnetic spectroscopy and mass spectroscopy. It is evident that the species in solution are dependent on pH and this impacts the corrosion inhibition mechanism and the efficiency. It was found that at a neutral pH of 5.5 the La(4OH-Cin) 3 behaves as a strong anodic inhibitor. Whereas, when the pH shifts to low (pH2.5) and/or high (pH8) the corrosion mechanism changes.

Original languageEnglish
Title of host publication18th International Corrosion Congress 2011
Subtitle of host publication20-24 November 2011; Perth, Australia
Place of PublicationBlackburn VIC Australia
PublisherAustralasian Corrosion Association
Pages1776-1786
Number of pages11
Volume3
ISBN (Print)9781618393630
Publication statusPublished - 2011
Externally publishedYes
EventInternational Corrosion Congress 2011 - Perth Convention and Exhibition Centre, Perth, Australia
Duration: 20 Nov 201124 Nov 2011
Conference number: 18th

Conference

ConferenceInternational Corrosion Congress 2011
Abbreviated titleICC 2011
CountryAustralia
CityPerth
Period20/11/1124/11/11
OtherThe 18th International Corrosion Congress took place between the 20th and the 24th November 2011 in the Perth Convention and Exhibition Centre, Australia. The International Corrosion Congress is the major event of the International Corrosion Council (ICC), an international body founded to advance corrosion science and engineering and is held once every three years by different host countries.

Keywords

  • Carboxylates
  • Corrosion inhibition
  • Electrochemistry
  • Lanthanum
  • Mass spectrometry
  • Nuclear magnetic spectroscopy

Cite this

Seter, M., Forsyth, M., & Hinton, B. (2011). Investigating the effect of solution pH on speciation of La(4OH-Cin) 3 with correlation to electrochemical behaviour and corrosion efficiency. In 18th International Corrosion Congress 2011: 20-24 November 2011; Perth, Australia (Vol. 3, pp. 1776-1786). Australasian Corrosion Association.