A Nanotechnology in Corrosion Science (Part 5)

—Protection of Passive Film against Breakdown and Substrate Iron against Corrosion by Coverage of Passivated Iron with an Ultrathin Two-dimensional Polymer Coating—

Abstract

An ultrathin, two-dimensional polymer coating of carboxylate ion self-assembled monolayer adsorbed on a passivated iron electrode is prepared by chemical modification with alkyltriethoxysilanes. Passive film breakdown in 0.1 M NaCl, 0.1 M Na₂SO₄, and 0.1 M KClO₄ with and without Cl⁻ is markedly prevented by coverage with the polymer coating and healing treatment in 0.1 M NaNO₃. Complete protection of the iron electrode against corrosion in these solutions is accomplished by covering the electrode with the healed passive film and polymer coating unless the passive film is broken down.