Corrosion Mitigation of Mild Steel by New Rare Earth Cinnamate Compounds

Authors: Blin, F.; Leary, S.G.; Wilson, K.; Deacon, G.B.; Junk, P.C.; Forsyth, M.

Source: Journal of Applied Electrochemistry, Volume 34, Number 6, June 2004 , pp. 591-599(9)

Publisher: Springer

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Abstract:

Corrosion rate measurements based on weight loss (i.e., mild steel immersed for seven days in 0.01 M NaCl) and linear polarization resistance (LPR) techniques have shown that even low concentrations (200 ppm) of cerium and lanthanum cinnamates are able to significantly inhibit corrosion. Of all the compounds investigated in this work Ce(4-methoxycinnamate)₃· 2 H₂O and La(4-methoxycinnamate)₃· 2 H₂O compounds exhibited the greatest inhibition and, in comparison with the component inhibitors, a synergy was clearly observed. The mechanism of corrosion inhibition was investigated using cyclic potentiodynamic polarization (CPP) measurements. The results suggest that La(4-nitrocinnamate)₃· 2 H₂O and Ce(4-methoxycinnamate)₃· 2 H₂O behave as mixed inhibitors and improve the resistance of steel against localized attack.

Keywords: cinnamates; corrosion inhibitors; mild steel; organic inhibitors; rare earth metal salts

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:JACH.0000021932.87043.7b

Affiliations: 1: Email: frederic.blin@spme.monash.edu.au

Publication date: 2004-06-01