Accession Number : ADA189503

Title :   An Interdisciplinary Approach to Predictive Modeling of Structural Adhesive Bonding. Factors Affecting the Durability of Titanium/Epoxy Bonds.

Descriptive Note : Summary rept.,

Corporate Author : VIRGINIA TECH CENTER FOR ADHESION SCIENCE BLACKSBURG

Personal Author(s) : Filbey, J A ; Wightman, J P

PDF Url : ADA189503

Report Date : Oct 1987

Pagination or Media Count : 320

Abstract : Factors influencing the durability of Titanium-6-4 / epoxy and Ti-6-4 / metal alkoxide / epoxy interphases were studied by first determining chemical and HYSICAL PROPERTIES OF Ti-6-4 adherend surfaces; second by characterizing the strength and durability of Ti-6-4 / epoxy bonds; and third by using aluminum and titanium alkoxides as possible adhesion promoters. Ti-6-4 adherend surfaces were oxidized either by chemical etch or anodization. Four principal pretreatments were studied: chromic acid anodization (CAA), sodium hydroxide anodization (SHA), phosphate fluoride acid etch (P/F), and TURCO basic etch (TURCO). The oxides were characterized physically by SEM, STEM, profilometry, and contact angles; and chemically by XPS, AES, SIMS, and indicator dyes. The two anodically produced oxides were porous, with pore diameters of 40 to 50 nm, while P/F and TURCO pretreated adherends showed no porosity. Good reproducibility of oxide composition was seen by XPS. The acidity/basicity of the surfaces was found to be in order of increasing basicity CAA P/F TURCO SHA.

Descriptors :   *ADHESIVE BONDING, *EPOXY COMPOUNDS, *PHASE STUDIES, *TITANIUM ALLOYS, *ADHESIVES, ALKOXY RADICALS, ALUMINUM, ANODIC COATINGS, BONDED JOINTS, BONDING, CHROMIC ACID, DYES, ETCHING, FLUORIDES, INDICATORS, OXIDES, PHOSPHATES, POROSITY, PROFILOMETERS, STRUCTURAL MECHANICS, TITANIUM, STRENGTH WEIGHT RATIO, SURFACE CHEMISTRY, INTERFACES, CHEMICAL BONDS, PHASE TRANSFORMATIONS, POLYMERIC FILMS, FOURIER SPECTROSCOPY

Subject Categories : Adhesives, Seals and Binders
      Plastics
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE