Galvanic Coupling Between D6AC Steel, 6061-T6 Aluminum, Incone1 718, and Graphite- Epoxy Composite Material: Corrosion Occurrence and Prevention.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HUNTSVILLE AL GEORGE C MARSHALL SPACE FLIGHT CENTER
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The effects of galvanic coupling between D6AC steel, 6061-T6 aluminum, Inconel 718, and Graphite-Epoxy Composite Material GE 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 GE in salt water while Inconel 718 was shown to be compatible with GE. 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 GE. These results indicate that, when the GE is completely coated with paint or a paintpolyurethane resin combination, satisfactory protection of the D6AC steel is achieved with either a coat of zinc-rich primer or a primertopcoat combination. Likewise, satisfactory corrosion protection of the aluminum is achieved by coating it with an epoxy coating system. jg p18
- Properties of Metals and Alloys
- Polymer Chemistry
- Coatings, Colorants and Finishes
- Laminates and Composite Materials