Polyelectrolyte-Diffused Zinc Phosphate Conversion Coatings and Polyacid Coupling Primers for Corrosion Protection of Steel and Aluminum, and Alkali-Catalyzed Hydrolysis of Polyimide-Based Materials
Abstract
The segmental adsorption of polyelectrolyte macromolecules either on newly precipitated crystal nuclei or on crystal growth sites during the primary zinc phosphate (Zn.Ph) conversion process on cold-rolled steel surfaces, acts to array a uniformly packed fine crystal topography brought about by the suppression and delay of the crystal growth. This adsorption is due to charge transfer from the Zn atoms in the crystalline conversion coatings to the electron accepting oxygen portion of functional pendent groups such as carboxylic acid, -COOH, and sulfonic acid, -SO3H, in the polyectrolytes. The formation of ZN-OOC or OSO2 complexes yielded by charge transfer reactions at the polyelectrolyte-Zn.Ph crystal interfaces, not only provides the stiffness and ductility of the normally brittle Zn.Ph layers. Keywords: Zinc phosphate conversion coating; Polyelectrolyte macromolecule; Cold-rolled steel; Corrosion protection; Polyurethane topcoat; Polyacid coupling primer; Adhesion durability; Polyimide; Protective coatings; Akali-catalyzed; hydrolysis. (JES)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1989
- Accession Number
- ADA212240
Entities
People
- C. R. Clayton
- J. B. Warren
- L. E. Kukacka
- N. R. Carciello
- T. Sugama
Organizations
- Brookhaven National Laboratory