Calculation of Uniform Corrosion Current Density of Iron in Hydrochloric Acid Solutions based on the Principle of Maximum Entropy Production Rate Applied to Literature Data

Massimiliano Bestetti, Silvia Franz, Mazdak I. Hashempour, Antonello Vicenzo

Research output: Contribution to journalArticle

Abstract

In this paper a new procedure for the calculation of uniform corrosion current density is presented. The procedure is based on the following criterion: corrosion current and extent of anodic and cathodic areas are such that the entropy production rate is maximum. Experimental data for the reaction Fe(s) + HCl(aq) = FeCl2(aq) + H2(g), taken from literature, are used to test the new model. A comparison between corrosion current density calculated from weight loss measurements and current density calculated from polarization curves by means of the proposed model is carried out. The proposed model provides a better agreement, between Tafel line extrapolation and gravimetric measurement, in comparison to the mixed potential theory usually adopted.

Original languageEnglish
Pages (from-to)673-679
Number of pages7
JournalProtection of Metals and Physical Chemistry of Surfaces
Volume54
Issue number4
DOIs
Publication statusPublished - 1 Jul 2018

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Hydrochloric Acid
Hydrochloric acid
Current density
Entropy
Iron
Corrosion
Extrapolation
Polarization

Keywords

  • corrosion current density
  • entropy production rate
  • exchange current density
  • Tafel slope
  • uniform corrosion

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "In this paper a new procedure for the calculation of uniform corrosion current density is presented. The procedure is based on the following criterion: corrosion current and extent of anodic and cathodic areas are such that the entropy production rate is maximum. Experimental data for the reaction Fe(s) + HCl(aq) = FeCl2(aq) + H2(g), taken from literature, are used to test the new model. A comparison between corrosion current density calculated from weight loss measurements and current density calculated from polarization curves by means of the proposed model is carried out. The proposed model provides a better agreement, between Tafel line extrapolation and gravimetric measurement, in comparison to the mixed potential theory usually adopted.",
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AB - In this paper a new procedure for the calculation of uniform corrosion current density is presented. The procedure is based on the following criterion: corrosion current and extent of anodic and cathodic areas are such that the entropy production rate is maximum. Experimental data for the reaction Fe(s) + HCl(aq) = FeCl2(aq) + H2(g), taken from literature, are used to test the new model. A comparison between corrosion current density calculated from weight loss measurements and current density calculated from polarization curves by means of the proposed model is carried out. The proposed model provides a better agreement, between Tafel line extrapolation and gravimetric measurement, in comparison to the mixed potential theory usually adopted.

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