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

conference contribution
posted on 01.01.2011, 00:00 authored by Marianne Seter, Maria ForsythMaria Forsyth, Bruce HintonBruce Hinton
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(4OHCin) 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.

History

Event

International Corrosion Congress (18th : 2011 : Perth, W. A.)

Pagination

1 - 11

Publisher

International Corrosion Council

Location

Perth, W. A.

Place of publication

[Perth, W. A.]

Start date

20/11/2011

End date

24/11/2011

Language

eng

Publication classification

E1 Full written paper - refereed

Title of proceedings

ICC 2011 : 18th International Corrosion Congress : Corrosion Control, Contributing to a Sustainable Future for All