Abstract
Measurements of the kinetics of steel corrosion in hydrochloric acid inhibited with trans‐cinnamaldehyde (TCA) indicate that both adsorption of TCA and formation of a continuously thickening polymer film are important features of the inhibition mechanism. Surfactants play a key role in facilitating the adsorption reaction. We propose that adsorption involves formation of a tenacious highly protective surface complex on the protonated chloride‐covered steel. TCA can also undergo reduction at the surface, thus initiating polymerization reactions that lead to growth of a barrier film. However, film formation depletes the solution of TCA, which can affect the stability of the sorbed complex.
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