Actions for Chemisorption mechanism and effect of polyacrylic acid on the improvement in bond durability of zinc phosphate-to-polymer adhesive joints

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Chemisorption mechanism and effect of polyacrylic acid on the improvement in bond durability of zinc phosphate-to-polymer adhesive joints

Author
Sugama, T.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Carciello, N., Kukacka, L. E., and Warren, J. B.

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Summary
It has been found that the outermost surface sites of polyacrylic acid-complexed crystalline Zn x Ph layers precipitated on cold-rolled steel surfaces act significantly to promote interfacial adhesive bonding to polymeric topcoats. This is the result of electrostatic internal diffusion and segmental chemisorption mechanisms of polyelectrolyte macromolecules either on newly precipitated crystal nuclei or on crystal growth sites during the primary zinc phosphate (Zn x Ph) conversion process. The nature of the polymer-to-polymer chemical bond produced at the polymer-to-complex Zn x Ph precoat interfacial joints plays the key role in the achievement of long-term bond durability upon exposure to chemically corrosive environments. The locus of adhesive loss at the polymer-to-complex Zn x Ph joints after exposure to a hot acid solution was clearly identified to be cohesive failure in the crystalline precoat layers. A stable bond resulted from the formation of an interfacially produced hydrophobic structure by interactions between the polymer and the functional organic species existing on the complex precoat surfaces. The chemisorbed polyelectrolytes also served to chemically couple the organic coating and the inorganic Zn x Ph conversion layer.
Report Numbers
DE86011535; BNL-37808
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC02-76CH00016
OSTI Identifier 5820179
Research organization: Brookhaven National Lab., Upton, NY (USA).
View MARC record | catkey: 47366656