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

Seter, M., Forsyth, M. and 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 ICC 2011 : 18th International Corrosion Congress : Corrosion Control, Contributing to a Sustainable Future for All, International Corrosion Council, [Perth, W. A.], pp. 1-11.

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Title Investigating the effect of solution pH on speciation of La(4OH-cin)3 with correlation to electrochemical behaviour and corrosion efficiency
Formatted title Investigating the effect of solution pH on speciation of La(4OH-cin)3 with correlation to electrochemical behaviour and corrosion efficiency
Author(s) Seter, M.
Forsyth, M.
Hinton, B.
Conference name International Corrosion Congress (18th : 2011 : Perth, W. A.)
Conference location Perth, W. A.
Conference dates 20-24 Nov. 2011
Title of proceedings ICC 2011 : 18th International Corrosion Congress : Corrosion Control, Contributing to a Sustainable Future for All
Editor(s) [Unknown]
Publication date 2011
Conference series International Corrosion Congress
Start page 1
End page 11
Publisher International Corrosion Council
Place of publication [Perth, W. A.]
Keyword(s) lanthanum
carboxylates
corrosion inhibition
electrochemistry
nuclear magnetic spectroscopy
mass spectrometry
Summary 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.
Language eng
Field of Research 090403 Chemical Engineering Design
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category E1 Full written paper - refereed
Persistent URL http://hdl.handle.net/10536/DRO/DU:30042253

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