Accession Number : ADA184847

Title :   Water Disbondment Characterization of Organic Coating/Metal Substrate Systems.

Descriptive Note : Interim rept. Oct 86-Jul 87,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DIRECTORATE

Personal Author(s) : Spadafora, Stephen J

PDF Url : ADA184847

Report Date : 15 Jul 1987

Pagination or Media Count : 53

Abstract : The adhesion of many organic coatings to metal substrates is adversely affected by exposure to an aqueous environment. Even high relative humidities can cause coating disbondment to occur. The mechanism behind this adhesion loss is the accumulation of water molecules at small preexisting unbonded areas at the coating under a concentration gradient, condenses in these areas and causes them to grow. As these areas grow laterally, they cause stresses to occur at the coating/substrate interface which eventually leads to the specific coating makes with the substrate the more resistant that system is to water disbondment.

Descriptors :   *ORGANIC COATINGS, *METAL PLATES, *ADHESIVE BONDING, PROTECTIVE COATINGS, PLASTIC COATINGS, LOSSES, INTERFACES, WATER, DIFFUSION, CONDENSATION, POLYMERS, WATERPROOFING, PH FACTOR, CURING, METALS, LIQUID IMMERSION TESTS, NONDESTRUCTIVE TESTING

Subject Categories : Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE