Determination of the Effect of Composition, Structure and Electrochemical Mass Transport Properties on Adhesion and Corrosion Inhibition of Paint Films
Abstract
Mass transport properties of five different paints have been investigated. Water permeability coefficients have been obtained using ASTM methods. Water diffusion coefficients have been measured for two paints, a vinyl resin and a polyurethane. The results strongly suggest that the diffusivity changes with position across these paints. A permeability model encompassing these facts is presented. Permeability coefficients and transference number for the transport of sodium and chloride ions have been measured in one type of polyurethane paint. The evidence is that two thirds of the current passing through the polyurethane films is not carried by either sodium or chloride. A model has been proposed in which the additional current is carried by ions resulting from dissociation of a neutral compound. The transport parameters will be related to chemical and structural properties of the paints to obtain a fundamental understanding of the corrosion mechanism.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA095293
Entities
People
- Robert T. Ruggeri
- Theodore R. Beck