Analysis of the film formed on steel during exposure to t-cinnamaldehyde (TCA) in 4.4 M hydrochloric acid at 65 C reveals it to be a complex mixture of low-molecular-weight aromatic hydrocarbon polymers, including polyenes. The polymerization reactions appear to be initiated by reduction of TCA at the steel surface. The film so formed is probably anchored to the surface via adsorbed TCA and serves as a diffusion barrier to enhance the inhibition. Although the thickness of the coating reaches a limiting value, both its average molecular weight and the degree of protection it affords the steel continue to increase with increasing exposure time.
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Growcock et al. (1988) studied this question.
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