Development of Surface Treatments for Titanium Alloys for Adhesive Bonding.
Abstract
This report describes the development of an improved surface treatment for titanium alloys for adhesive bonding. Numerous surface treatments including acid etch, anodize, vapor blast and combinations were investigated. The effect of hostile environments such as salt spray, high humidity and high temperature on bonded tensile lapshear (including prestress and aged) specimens was evaluated. An epoxy- novalac adhesive was utilized for 350 F ENVIRONMENTS WHILE A POLYIMIDE WAS EVALUATED AT 600 F. A combination mechanical-chemical treatment was found to offer the best surface for bonding titanium alloys. By combining a reactive solution with a conventional vapor blast, intermittent contamination or reoxidation of the cleaned titanium surface was reduced significantly. The treated titanium surfaces were examined with the scanning electron microscope and various topographies correlated to strength values of bonded specimens. Evaporation rate analysis was also utilized. No detrimental effects to the metallurgical properties of the titanium were found. There was no reduction in fatigue strength or ductility and no increase in absorbed hydrogen. (Author-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1972
- Accession Number
- AD0905048
Entities
People
- Gerald W. Lively
Organizations
- Vought