Iron corrosion inhibition in hot 4 M HCl solution by t-cinnamaldehyde and its structure-related compounds

Add time:07/27/2019    Source:sciencedirect.com

The inhibiting action of t-cinnamaldehyde (TCA) and some of its structure-related derivatives, against corrosion of ARMCO iron in 4 M HCl, has been studied, in the temperature range between 40 and 90°C. Other than TCA, α-chlorocinnamaldehyde (αCl), α-bromocinnamaldehyde (αBr), cinnamyl alcohol (OH) and cinnamnitrile (CN) have been considered. The average corrosion rates and the inhibiting efficiencies have been calculated by weight loss measurements at the end of 6-h tests; the dissolution kinetics have been determined on aliquots, by spectrophotometric analysis of the dissolved iron during the 6-h testing. The anodic and cathodic polarisation curves have been recorded in all the tested conditions, at the end of the 6-h tests with the purpose of obtaining some information on the action mechanisms of the inhibitors. CN and TCA are the best inhibitors, showing efficiencies >94% in the whole interval of temperature examined. CN seems to act mainly through a chemisorption process, whereas in the case of TCA the adsorption process is followed by some polymerisation-reduction reactions.

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