Mechanical Properties of Adhesively Bonded Aluminum Structures Protected with Hydration Inhibitors,

Abstract

Research has shown that an adsorbed monolayer of the organic inhibitor nitrilotris (methylene) phosphonic acid (NTMP) improves the bond durability of 2024 Al adherends prepared by phosphoric acid anodization (PAA). As had previously been determined for Forest Products Laboratories (FPL)-prepared adherends, maximum improvements in bond durability occurred when a monolayer of NTMP was adsorbed onto the surface. Examination of the wedge test failure surfaces of PAA adherends treated in NTMP revealed that although crack propagation had initially involved oxide-hydroxide conversion of the original PAA oxide, the locus of failure transfers to the adhesive near the interface quite early in the test. This means that the failure of NTMP-treated PAA adherends was predominantly cohesive through the adhesive. In addition, the presence of NTMP at the oxide/adhesive interface did not degrade the initial bond strength when epoxy-based adhesive systems were used. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1982
Accession Number
ADA123403

Entities

People

  • D. A. Hardwick
  • J. D. Venables
  • J. S. Ahearn

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Adhesive Bonding
  • Aluminum
  • Aqueous Solutions
  • Bonding
  • Crack Propagation
  • Cracks
  • Electron Microscopes
  • Hydroxides
  • Materials
  • Mechanical Properties
  • Mechanics
  • Microscopes
  • Military Research
  • Monomolecular Films
  • Peel Strength
  • Resilience
  • Water

Readers

  • Surface Coatings Technology.