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51316-7306-Estimation of Corrosion Products and Inhibitor Films Contributions to Total Protective Effect

Picture for Estimation of Corrosion Products and Inhibitor Films Contributions to Total Protective Effect
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Product Number: 51316-7306-SG
ISBN: 7306 2016 CP
Author: Roman Kashkovskiy
Publication Date: 2016
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It is well known that the film of corrosion products (CP) which starts to form on the metal surface directly at the moment of its contact with corrosive aggressive environment often has certain protective properties and leads to significant decrease in corrosion rate especially at the initial stage of exposure. In case of corrosion inhibition an inhibitor is adsorbed on a CP film but corrosion slowing down is usually connected only with the presence of phase inhibitor layer on the metal surface without taking into account the protective CP film. Such assumption leads to serious exaggeration of inhibitor protective effect and the more protective CP film forms on metal the greater error of such estimation is. Thus separate estimation of protective effects of CP and inhibitorfilms is of interest.This paper offers the modification of method for separate estimation of corrosion products and inhibitor films contributions to total corrosion protective effect based on corrosion kinetics analysis the consideration of thickness change of corrosion products film under the influence of inhibitor and dissolution of this film.Modification 1 accounts thickness change of corrosion products film under the inhibitory influence of the amine on corrosion rate[1]. Modification 2 takes into account solution of corrosion product film in liquid and also thickness reduction of this film according to modification 1. Modification 3 considers additivity of corrosion protection coefficients of superficial films instead of additivity of corrosion protective effects as it is accepted in initial method[2].The comparison of modified methods results is carried out by the example of inhibition of steel hydrogen sulfide corrosion in a liquid phase by tributylamine.From the results and its discussion follows that modification 3 with accounting of thickness change of corrosion products film under the inhibitory influence and solution of this film is the most correct method for separate estimation of superficial film components contributions to total protective effect.
It is well known that the film of corrosion products (CP) which starts to form on the metal surface directly at the moment of its contact with corrosive aggressive environment often has certain protective properties and leads to significant decrease in corrosion rate especially at the initial stage of exposure. In case of corrosion inhibition an inhibitor is adsorbed on a CP film but corrosion slowing down is usually connected only with the presence of phase inhibitor layer on the metal surface without taking into account the protective CP film. Such assumption leads to serious exaggeration of inhibitor protective effect and the more protective CP film forms on metal the greater error of such estimation is. Thus separate estimation of protective effects of CP and inhibitorfilms is of interest.This paper offers the modification of method for separate estimation of corrosion products and inhibitor films contributions to total corrosion protective effect based on corrosion kinetics analysis the consideration of thickness change of corrosion products film under the influence of inhibitor and dissolution of this film.Modification 1 accounts thickness change of corrosion products film under the inhibitory influence of the amine on corrosion rate[1]. Modification 2 takes into account solution of corrosion product film in liquid and also thickness reduction of this film according to modification 1. Modification 3 considers additivity of corrosion protection coefficients of superficial films instead of additivity of corrosion protective effects as it is accepted in initial method[2].The comparison of modified methods results is carried out by the example of inhibition of steel hydrogen sulfide corrosion in a liquid phase by tributylamine.From the results and its discussion follows that modification 3 with accounting of thickness change of corrosion products film under the inhibitory influence and solution of this film is the most correct method for separate estimation of superficial film components contributions to total protective effect.
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