Factors affecting the durability of Ti-6 Al-4V/epoxy bonds

Thesis/Dissertation · Wed Dec 31 23:00:00 EST 1986

OSTI ID:6293296

Filbey, J A

Factors influencing the durability of Ti-6-4/epoxy and Ti-6-4/metal alkoxide/epoxy interphases were studied by first determining chemical and physical properties of Ti-6-4 adherend surfaces; second by characterizing the strength and durability of Ti-6-4/epoxy bonds; and third by using aluminium 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). All adhesive bonding was done with a structural epoxy, FM-300. Lap shear strengths showed no significant difference between pretreatments, reinforcing the opinion that the lap shear test is not surface sensitive. The stress durability and wedge test, however, showed vast differences in bond durability. The SHA and CAA pretreatments were equally durable in 80/sup 0/C, 95% r.n. The TURCO pretreatment was slightly less durable than the P/F pretreatment which exhibited no durability in hot-wet environments.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg (USA)
• OSTI ID: 6293296
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360603 -- Materials-- Properties
ALKOXIDES
ALLOYS
ALUMINIUM ALLOYS
ANODIZATION
BONDING
CHEMICAL COATING
CORROSION PROTECTION
DEPOSITION
ELECTROCHEMICAL COATING
ELECTROLYSIS
EPOXIDES
ETCHING
FABRICATION
JOINING
LYSIS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SURFACE COATING
SURFACE FINISHING
SURFACE PROPERTIES
TITANIUM ALLOYS
VANADIUM ALLOYS