Accession Number : ADA200548

Title :   Adsorption of Phosphorus Acids on Alumina.

Descriptive Note : Technical rept.,

Corporate Author : AKRON UNIV OH INST OF POLYMER SCIENCE

Personal Author(s) : Ramsier, R. D. ; Henriksen, P. N. ; Gent, A. N.

Report Date : OCT 1988

Pagination or Media Count : 44

Abstract : Penetration of moisture into adhesively bonded aluminum structures can and often does lead to deterioration and ultimate failure of the bonds. Methods of retarding moisture penetration into these systems are therefore desirable. One successful method consists of treating the oxidized aluminum (alumina) surface with an hydration inhibitor prior to application of the adhesive. In a comprehensive study of the use of hydration inhibitors to improve the durability of aluminum joints, Davis et al. found that alumina surfaces treated with certain amino phosphonates exhibited a much higher resistance to hydration than untreated surfaces. There it was proposed that phosphonic acids absorb on alumina by a condensation reaction involving hydroxyl groups of the acid and those on alumina, resulting in the formation of P-O-Al bonds. Keywords: Adhesive bonding; Adhesion, Adsorption, Alumina, Chemisorption, Hydration inhibition, IETS, Phosphorus acids, Surface condensation, Spectroscopy. (KT)

Descriptors :   *ADHESIVE BONDING, *COATINGS, *ALUMINUM, ACIDS, ADHESION, ADHESIVES, ADSORPTION, MOISTUREPROOFING, ALUMINUM OXIDES, AMINES, BONDED JOINTS, CHEMISORPTION, CONDENSATION, CONDENSATION REACTIONS, DETERIORATION, FAILURE, HYDRATION, HYDROXYL RADICALS, INHIBITION, INHIBITORS, JOINTS, MOISTURE, OXIDATION, PENETRATION, PHOSPHONATES, PHOSPHONIC ACIDS, PHOSPHORUS, RESISTANCE, RETARDATION, SPECTROSCOPY, STRUCTURES, SURFACES.

Subject Categories : Coatings, Colorants and Finishes
      Adhesives, Seals and Binders
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE