Mass Transfer of Phosphorus-Containing Corrosion Inhibitors in Epoxy Protective Coatings

Mass transfer of phosphorus-containing corrosion inhibitors in epoxy matrices, which form the layers of anticorrosion primers and coatings, has been investigated. It has been shown that diffusion profiles of phosphonic acid distribution are stepwise, which has been previously observed in a broad ran...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces 2019-12, Vol.55 (7), p.1345-1351
Main Authors: Golovin, V. A., Il’in, A. B., Aliev, A. D., Rabinkov, V. A.
Format: Article
Language:English
Subjects:
Acids
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion inhibitors
Corrosion prevention
Diffusion
Diffusion coatings
Industrial Chemistry/Chemical Engineering
Inorganic acids
Inorganic Chemistry
Mass transfer
Materials Science
Metallic Materials
Organic acids
Phosphates
Phosphonic acids
Phosphorus
Primers (coatings)
Protective Coatings
Rate constants
Tribology
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Summary:Mass transfer of phosphorus-containing corrosion inhibitors in epoxy matrices, which form the layers of anticorrosion primers and coatings, has been investigated. It has been shown that diffusion profiles of phosphonic acid distribution are stepwise, which has been previously observed in a broad range of mineral and organic acids. Penetration rate constants λ of phosphonic acids are comparable with the values that are intrinsic for inorganic acids. The acid-to-water ratio in internal solution in polymer is higher than in outer diffusant solution upon diffusion of phosphonic acids to amine-hardened epoxy matrices. A selective diffusion of phosphate anions has been observed in the solutions of acidic monosubstituted phosphates.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205119070050