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ATR characterisation of synergistic corrosion inhibition of mild steel surfaces by cerium salicylate
journal contributionposted on 01.11.2002, 00:00 authored by Maria ForsythMaria Forsyth, C Forsyth, K Wilson, T Behrsing, G Deacon
The nature of deposits on mild steel surfaces formed by exposure to corrosive and inhibiting solutions has been examined by attenuated total reflectance spectroscopy. For cerium-based inhibitors, e.g. CeCl3 the formation of cerium-containing coatings was detected whilst the cerium carboxylate Ce(sal)3 (sal=salicylate), which combines the Ce3+ with the known organic inhibitor sal−, was shown to involve substantial deposition of both cerium and a salicylate species. These results, combined with corrosion inhibition data for the respective inhibitor compounds clearly indicate a synergistic corrosion mechanism for Ce(sal)3 which underpins the improved performance of this corrosion inhibitor in comparison to the individual components (i.e. Na(sal) or CeCl3).