Determination of the Effect of Composition, Structure, and Electrochemical Mass Transport Properties on Adhesion and Corrosion Inhibition of Paint Films.
Abstract
The transport of sodium and chloride ions and water through six unpigmented paints has been investigated experimentally using a radiotracer method. A previously proposed mass transport model of paints was inadequate to explain the experimental observations. A new mass transport model is proposed and tested. Qualitative agreement between the new model and the experiments is achieved when the effective dielectric constant of the paint is increased above the observed value. A gravametric microbalance technique was used to determine the sorption of water by four types of paint. Both steady state and transient conditions have been investigated. These experiments show that both the solubility and diffusivity depend on the specimen thickness. The results are interpreted in terms of a two-phase paint layer which preferentially absorbs water near the paint-metal interface. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1983
- Accession Number
- ADA138487
Entities
People
- R. T. Ruggeri
- T. R. Beck