Corrosion protection and galvanic corrosion prevention for 7075 Al and Ti-6Al-6V-2Sn alloys. Final report

Technical Report · Tue Jul 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/5225729· OSTI ID:5225729

Clay, F. A.

Sulfuric-acid-anodized and electroless-nickel-plated 7075 aluminum alloy panels successfully passed 96 hours of salt spray testing when galvanically coupled to duplex-annealed Ti-6Al-6V-2Sn alloy panels. Adherent paint deposits were produced on the titanium alloy and electroless nickel surfaces using a wash primer, an epoxy primer, and a urethane paint coating. A painted part survived 35 cycles of alternating salt spray and hot and freezing environments without blistering. A low chloride cutting fluid was selected for production machining of Ti-6Al-6V-2Sn, based on chemical analysis and stress-corrosion tests. A cleaning process was developed to remove both titanium and aluminum cutting fluids. Modified wedge-opening-loading specimens were used to verify that no stress-corrosion cracking problems occurred with the duplex-annealed Ti-6Al-6V-2Sn alloy because of residual titanium or aluminum cutting fluids.

• Research Organization: Bendix Corp., Kansas City, MO (United States)
• DOE Contract Number: AC04-76DP00613
• OSTI ID: 5225729
• Report Number(s): BDX-613-2396
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION PROTECTION
ALUMINIUM BASE ALLOYS
NICKEL
SURFACE COATING
TIN ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
ANODIZATION
CORROSION
SULFURIC ACID
ALLOYS
CHEMICAL COATING
CHEMICAL REACTIONS
DEPOSITION
ELECTROCHEMICAL COATING
ELECTROLYSIS
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LYSIS
METALS
TITANIUM ALLOYS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion