Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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The Influence of H+ and Cl- Ions on the Corrosion Inhibitive Effect of Poly(para-aminophenol) for Iron in Hydrochloric acid

  • Manivel, P. (Department of Chemistry, Thanthai Periyar Government Institute of Technology)
  • Received : 2017.06.28
  • Accepted : 2017.08.21
  • Published : 2017.08.31
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Abstract

Polymer amines are found to show distinct corrosion inhibition effects in acidic media. The functional groups of organic compounds have a wide role in the physical and chemical properties, for the inhibition efficiency with respect to steric factors, aromaticity, and electron density. The influence of $H^+$ ions and $Cl^-$ ions on the corrosion inhibitive effect of poly(p-aminophenol) for iron in hydrochloric acid was studied using electrochemical methods such as impedance, linear polarization, and Tafel polarization techniques. The experiments were conducted with and without the inhibitor, poly(p-aminophenol). The concentration range of $H^+$ ions and $Cl^-$ ions are from 1 M to 0.05 M and 1 M to 0.1 M, respectively. With the inhibitor poly(p-aminophenol), this study shows that inhibition efficiency decreases with the reduction of $H^+$ ion and $Cl^-$ ion concentrations in aqueous solution. Further, it reveals that the adsorption of an inhibitor on the surface of iron is dependent on the concentrations of $H^+$ and $Cl^-$ ions in the solution and the adsorption of inhibitor on the iron surface through the cationic form of amine.

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