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Kinetics of the corrosion inhibition reaction of steel alloys in acidic media by potassium iodide

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Abstract

Corrosion inhibition of low carbon steel, stainless steel types 316 and 304 in hydrochloric acid by potassium iodide was investigated at different temperatures using weight loss and polarization electrochemical techniques. Potassium iodide was found to be an excellent inhibitor for steel alloys with an efficiency reaching 97 % at 0.1 M of inhibitor concentration. Activation parameters were calculated using Arrhenius and transition state equations. The fraction of surface coverage calculated from corrosion rate data followed Langmuir adsorption isotherm by the formation of a monolayer on the metal surface. These results were confirmed by a kinetic–thermodynamic model. Activation and adsorption studies were fitted successfully to two mathematical equations: polynomial and exponential.

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Acknowledgment

This work was supported by Baghdad University, Chemical Engineering Department, which is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemical Engineering, College of Engineering, Baghdad University, Baghdad, Iraq

    Aprael S. Yaro & Shafaa M. Lahmod

  2. Department of Chemical Engineering, College of Engineering, Daiyla University, Baquba City, 32001, Daiyla Governorate, Iraq

    Anees A. Khadom

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  1. Aprael S. Yaro
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  2. Anees A. Khadom
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  3. Shafaa M. Lahmod
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Correspondence to Anees A. Khadom.

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Yaro, A.S., Khadom, A.A. & Lahmod, S.M. Kinetics of the corrosion inhibition reaction of steel alloys in acidic media by potassium iodide. Reac Kinet Mech Cat 109, 417–432 (2013). https://doi.org/10.1007/s11144-013-0568-z

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  • DOI: https://doi.org/10.1007/s11144-013-0568-z

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