Protection of passive film breakdown and corrosion of iron in 0.5 M NaCl by coverage with an ultrathin two-dimensional polymer coating and healing treatment of passive film

Tadashi Shimura, Kunitsugu Aramaki

Research output: Contribution to journalArticle

Abstract

The time required for passive film breakdown, tbd and the protective efficiency, P of an ultrathin two-dimensional polymer protective coating prepared by chemical modification of a carboxylate ion self-assembled monolayer adsorbed on a passivated Fe were measured in aerated 0.5 M NaCl. The value of tbd was short, 1.7 h. The tbd value of the passivated Fe electrode covered with the polymer coating and further, healed in 0.1 M NaNO3 was 4.1 h. The P values of these coatings were extremely high, around 99.9% before tbd, indicating perfect protection of Fe against corrosion in both solutions, unless the passive film was broken down. The P values of protective coatings prepared by chemical modification of three self-assembled monolayers adsorbed on metals and oxidized metals were compared with one another in short and long ranges of the immersion time in oxygenated 0.5 M neutral solutions.

Original languageEnglish
Pages (from-to)152-155
Number of pages4
JournalZairyo to Kankyo/ Corrosion Engineering
Volume66
Issue number4
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Chemical modification
Protective coatings
Self assembled monolayers
Polymers
Iron
Metals
Corrosion
Coatings
Ions
Electrodes

Keywords

  • Carboxylate ion self-assembled monolayer
  • Corrosion protection efficiency
  • Healing treatment
  • Passivated iron
  • Passive film breakdown
  • Two-dimensional polymer coating

ASJC Scopus subject areas

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

Cite this

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N2 - The time required for passive film breakdown, tbd and the protective efficiency, P of an ultrathin two-dimensional polymer protective coating prepared by chemical modification of a carboxylate ion self-assembled monolayer adsorbed on a passivated Fe were measured in aerated 0.5 M NaCl. The value of tbd was short, 1.7 h. The tbd value of the passivated Fe electrode covered with the polymer coating and further, healed in 0.1 M NaNO3 was 4.1 h. The P values of these coatings were extremely high, around 99.9% before tbd, indicating perfect protection of Fe against corrosion in both solutions, unless the passive film was broken down. The P values of protective coatings prepared by chemical modification of three self-assembled monolayers adsorbed on metals and oxidized metals were compared with one another in short and long ranges of the immersion time in oxygenated 0.5 M neutral solutions.

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