The Importance of Alkali Metal Cations in Acid Environments in Contact with Corrosion‐Protective Organic Coatings

Leidheiser, Henry; Vedage, Hyacinth; Granata, Richard D.; White, Malcolm L.

doi:10.1149/1.2115873

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1986

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“…Thus the smaller (hydrated) ions diffuse more readily through the coating, dilute the acid, and decrease the blistering rate. Additional details of cation effects have been published (Leidheiser et al, 1984). The sample of gas collected from an epoxy-coated substrate that had been exposed to acid for about 3000 h shows peaks for H2(2), He(4), C(12), N(14), H20(18), , N2(28), 02(32), and C02(44).…”

Section: Resultsmentioning

confidence: 99%

Failure mechanisms for organic coatings subjected to 0.1M sulfuric acid

White¹,

Vedage²,

Granata³

et al. 1986

Ind. Eng. Chem. Prod. Res. Dev.

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The ability of a fluoropolymer and an epoxy coating to protect steel against corrosion in 0.1 M H2S04 at 60 °C was evaluated by four techniques: (1) cathodic delamination, (2) tensile adhesion, (3) rate of blister formation, and (4) gas analysis of blisters. The data obtained show that acid diffuses through the coating to react with the steel surface to oxidize (corrode) it and to form hydrogen gas by the reduction of the hydrogen ion in the acid. If the generation of hydrogen occurs faster than its removal by diffusion through the coating or into the steel, a blister will form. If the rate of hydrogen formation is less than Its removal rate, there can be almost complete disbonding of the coating with no visible blisters.

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Section: Resultsmentioning

confidence: 99%