Chromic-acid anodized Ti-6Al-4V: its characterization and its single-lap bond strength to heat-resistant adhesives
Anodized Ti-6Al-4V/adhesive bonds exhibit improved corrosion resistance and a higher strength-to-weight ratio compared to conventional metal-bonding techniques for primary and/or secondary structural applications. This work was conducted to identify chromic acid (CA) anodization and bond-process conditions which produced durable, structural anodized Ti-6Al-4V/heat-resistant single-lap bonds and to understand why these conditions were necessary. A structural single-lap bond was defined as bond tested at 298K less than or equal to 0.5 month after bonding and with a strength greater than or equal to 6.9 MPa, based upon values reported in structural adhesive manufacturers' product literature. A durable, structural single-lap bond was defined as a bond with a strength greater than or equal to 6.9 MPa strength at 298K after 9 months aging at 443K. Heat-resistant adhesives tested had reported service temperatures greater than or equal to 423 K. Hydrofluoric acid (HF) added to the CA anodization solution was necessary to produce structural bonds. CA/HF oxide was more porous, and thicker than the CA anodic oxide (140 nm vs. 20 nm), perhaps promoting physical and oxide/adhesive interphase mechanical interlock. Structural, durable CA/HF anodized Ti-5Al-4V/adhesive bonds were produced for all adhesives tested except for the filled polyimide (5.5 MPa).
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg (USA)
- OSTI ID:
- 6977568
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ADHESIVES
HEAT RESISTANT MATERIALS
ALUMINIUM ALLOYS
BONDING
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
ANODIZATION
CHROMIC ACID
ALLOYS
CHEMICAL COATING
CHROMIUM COMPOUNDS
CORROSION PROTECTION
DEPOSITION
ELECTROCHEMICAL COATING
ELECTROLYSIS
FABRICATION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
JOINING
LYSIS
MATERIALS
OXYGEN COMPOUNDS
SURFACE COATING
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360105 - Metals & Alloys- Corrosion & Erosion