Effect of electrolysis conditions on the morphology and corrosion resistance of polyaniline films formed on iron by electropolymerization

Hiroaki Nakano, Keiichi Hayashi, Satoshi Oue, Shigeo Kobayashi

Research output: Contribution to journalArticle

Abstract

Polyaniline films were formed on an Fe substrate using the oxidative electropolymerization technique at 288 K in aqueous solutions of pH 2 to 10 containing aniline and p-toluenesulfonic and oxalic acids as supporting electrolytes, and the effect of conditions of electrolysis on the morphology and corrosion resistance of the films was investigated. Although the polyaniline films were formed partially in solutions of pH 2 to 4, the formation of films completed and the surface became smooth in solutions of pH 7 to 10. Polyaniline films with a smooth surface and good corrosion resistance were obtained at 8 to 30 A·m-2, while the films obtained at current densities above 50 A·m-2 showed a non-uniform surface morphology and the insufficient corrosion resistance. Films obtained at anode potentials of 0.4 and 0.8 V vs. NHE were not formed completely, and the films formed at an anode potential of 2.0 V exhibited very rough surfaces. Films formed from the solution containing p-toluenesulfonic acid as a supporting electrolyte exfoliated from the Fe substrate following immersion in a 3 mass% NaCl solution for 3 h. Although the films obtained from the solution containing oxalic acid as a supporting electrolyte showed the good adhesion to the substrate, they possessed many defects and pores, and as a result, the improvement in the Fe's corrosion resistance was less. In the solution containing both ptoluenesulfonic and oxalic acids as supporting electrolytes, the Fe coated with polyaniline films showed the good improvements in both corrosion resistance and adhesion.

Original languageEnglish
Pages (from-to)157-164
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume80
Issue number2
DOIs
Publication statusPublished - Jan 1 2016

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Electropolymerization
electrolysis
Polyaniline
Electrolysis
corrosion resistance
Corrosion resistance
Iron
iron
Electrolytes
oxalic acid
Oxalic acid
electrolytes
Oxalates
acids
Anodes
adhesion
anodes
polyaniline
Substrates
Adhesion

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Effect of electrolysis conditions on the morphology and corrosion resistance of polyaniline films formed on iron by electropolymerization",
abstract = "Polyaniline films were formed on an Fe substrate using the oxidative electropolymerization technique at 288 K in aqueous solutions of pH 2 to 10 containing aniline and p-toluenesulfonic and oxalic acids as supporting electrolytes, and the effect of conditions of electrolysis on the morphology and corrosion resistance of the films was investigated. Although the polyaniline films were formed partially in solutions of pH 2 to 4, the formation of films completed and the surface became smooth in solutions of pH 7 to 10. Polyaniline films with a smooth surface and good corrosion resistance were obtained at 8 to 30 A·m-2, while the films obtained at current densities above 50 A·m-2 showed a non-uniform surface morphology and the insufficient corrosion resistance. Films obtained at anode potentials of 0.4 and 0.8 V vs. NHE were not formed completely, and the films formed at an anode potential of 2.0 V exhibited very rough surfaces. Films formed from the solution containing p-toluenesulfonic acid as a supporting electrolyte exfoliated from the Fe substrate following immersion in a 3 mass{\%} NaCl solution for 3 h. Although the films obtained from the solution containing oxalic acid as a supporting electrolyte showed the good adhesion to the substrate, they possessed many defects and pores, and as a result, the improvement in the Fe's corrosion resistance was less. In the solution containing both ptoluenesulfonic and oxalic acids as supporting electrolytes, the Fe coated with polyaniline films showed the good improvements in both corrosion resistance and adhesion.",
author = "Hiroaki Nakano and Keiichi Hayashi and Satoshi Oue and Shigeo Kobayashi",
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AU - Hayashi, Keiichi

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AU - Kobayashi, Shigeo

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