Protective coating to retard crack growth in aluminum alloy

Details Protective coating to retard crack growth in aluminum alloy Protective coating to retard crack growth in aluminum alloy

1980-09-29

1982-04-27

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polythioether

148 627, 428411, 428413, 428416, 4284231, 4284235, 4284258, 428457, 428458, B32B 1508, B32B 2740, B32B 2738, C23F 1114

Patent

active

043271529

ABSTRACT:
A protective coating to retard crack growth in aluminum and aluminum alloys has particular utility when applied to the surfaces of structural parts of aircraft providing a crack growth inhibitor to a crack surface when and as it develops in such parts. This inhibitor is a compound having a vapor pressure high enough to volatilize the inhibitor and emit molecules which will react with the surface of the metal to form a protective film. It is blended within a selected primer and is thereby available for interaction with the surface and tip of any crack which may initiate beneath the primer. A topcoat of low-permeability polyurethane covers the inhibitor-reinforced primer to prevent escape of the inhibitor from the primer.

REFERENCES:
patent: 3382081 (1968-05-01), Cutter
patent: 3787246 (1974-01-01), Tagai

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