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The influence of organic structure and rare earth metal cation on the corrosion efficiency observed on AS1020 steel compared with La(4OHCin)3

1 ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Burwood Campus, Australia;
2 Centre for Green Chemistry and School of Chemistry, Monash University, Clayton Campus, Australia;
3 College of Science, Technology, and Engineering, James Cook University, Townsville, Queensland, Australia

Special Issues: Rare-earth-based materials

Whilst the corrosion protection of steel in aqueous chloride environments by the rare earth inhibitor lanthanum 4-hydroxycinnamate is well known, the influence of the structural variation of the organic component as well as the nature of the metal centre has not previously been addressed. Herein we show that praseodymium 4-hydroxy cinnamate is comparable to its lanthanum counterpart in aqueous solution. On the other hand, cerium 4-hydroxycinnamate and lanthanum 2-hydroxycinnamate show poor corrosion protection performance while lanthanum 3-hydroxycinnamate provides a level of inhibition between these. These differences are shown to be related to the speciation in solution and are postulated to be linked to steric influences which are likely to affect the bonding environment within the rare earth compound itself, as well as its bonding with the steel substrate.
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Keywords corrosion inhibition; rare earth metal compounds; cinnamates; speciation

Citation: Marianne Seter, Gaetan M. A. Girard, Winnie W. Lee, Glen Deacon, Peter Junk, Bruce Hinton, Maria Forsyth. The influence of organic structure and rare earth metal cation on the corrosion efficiency observed on AS1020 steel compared with La(4OHCin)3. AIMS Materials Science, 2015, 2(1): 1-15. doi: 10.3934/matersci.2015.1.1


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