Galvanic Coupling Between D6AC Steel, 6061-T6 Aluminum, Incone1 718, and Graphite- Epoxy Composite Material: Corrosion Occurrence and Prevention.
Abstract
The effects of galvanic coupling between D6AC steel, 6061-T6 aluminum, Inconel 718, and Graphite-Epoxy Composite Material (G/E) in 3.5% NaCl have been studied. Measurements of corrosion potentials, galvanic currents and corrosion rates of the bare metals using weight-loss methods have served to establish the need for corrosion protection in cases where D6AC steel and 6061-T6 aluminum are galvanically coupled to G/E in salt water while Inconel 718 was shown to be compatible with G/E. Six tests were made to study corrosion protective methods for eliminating galvanic corrosion in the cases of D6AC steel and 6061-T6 aluminum coupled to G/E. These results indicate that, when the G/E is completely coated with paint or a paint/polyurethane resin combination, satisfactory protection of the D6AC steel is achieved with either a coat of zinc-rich primer or a primer/topcoat combination. Likewise, satisfactory corrosion protection of the aluminum is achieved by coating it with an epoxy coating system. jg p18
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1983
- Accession Number
- ADA305210
Entities
People
- Merlin D. Danford
- Ralph H. Higgins
Organizations
- National Aeronautics and Space Administration