Effect of citrate ions on the electrochemical behaviour of low-carbon steel in borate buffer solutions

The electrochemical behaviour of cold-rolled low carbon steel was studied on both active and passive potential regions in borate buffer solutions with and without the addition of sodium citrate (NaCit). In the active region anodic charges increased significantly and R CT values decreased with citrat...

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Bibliographic Details
Published in:Corrosion science 2004-03, Vol.46 (3), p.529-545
Main Authors: Modiano, S., Fugivara, C.S., Benedetti, A.V.
Format: Article
Language:English
Subjects:
Applied sciences
B. EIS
C. Passive film
Corrosion
Corrosion environments
Corrosion mechanisms
Cyclic voltammetry
Exact sciences and technology
Low-carbon steel
Metals. Metallurgy
Oxide layer stability
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Summary:The electrochemical behaviour of cold-rolled low carbon steel was studied on both active and passive potential regions in borate buffer solutions with and without the addition of sodium citrate (NaCit). In the active region anodic charges increased significantly and R CT values decreased with citrate, due to the formation of soluble complexes. In the passive potential region the film formed at +0.4 V in borate buffer solution with and without 0.010 M NaCit is probably enriched by Fe 3O 4 oxide, while films formed at +0.8 V are probably enriched by γ-Fe 2O 3. The equivalent circuit [ R s( R CT Q)] fitted all experimental impedance data.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(03)00170-7