The effect of ion species in electrolyte film covering the steel surface on the rust formation and protective ability of the rust in 3.5%NaCl solution was examined. Rust layer as mixture of β -FeOOH, γ - FeOOH and small amount of α -FeOOH does not prevent metal dissolution. The Cr-substituted goethite layer formed under the electrolyte containing Cr3+ and SO42- strongly suppresses metal dissolution in the NaCl solution. The rust layer formed under the electrolyte containing Ni2+ and SO42- also possesses high protective ability against corrosive Cl− anion. The protective ability of the rust layer is affected by the initial adhesion of salt particle on the steel surface and by the electrolyte film thickness. These results are attributed to difference in rust phase and structure.

Subject
Steel structures, Steel surfaces, Ions, Corrosion currents, Corrosion rate, Sodium chloride, Sodium chloride solution, Film formation, Surface layers, Steel, Rust, Corrosion protection, Electrolytes
Keywords:
Atmospheric corrosion, Electrolyte thin film, Ion species, Rust layer, goethite, akaganeite
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2000
Association for Materials Protection and Performance (AMPP)
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