Corrosion resistant honeycomb

Abstract

Corrosion resistant metallic honeycomb composed of a plurality of honeycomb cells having cell walls that include cell edges that form the edge of the honeycomb. A corrosion resistant coating that contains polyamideimide is used to cover the cell walls and cell edges. The corrosion resistant coating is preferably applied after the honeycomb structure has been formed.

1 . In a method for making honeycomb wherein sheets of metallic material are bonded together at selected locations and then expanded to form said honeycomb, the improvement comprising applying a solution of reactive amic acid prepolymer to said honeycomb to form a coating thereon and curing said coating to provide corrosion resistant layer comprising polyamideimide. 
     
     
         2 . An improved method for making honeycomb according to  claim 1  wherein said honeycomb comprises a plurality of honeycomb cells having cell walls and cell edges, said method including the step of applying said reactive amic acid prepolymer to both said cell walls and said cell edges to form said coating on said cell walls and cell edges. 
     
     
         3 . An improved method for making honeycomb according to  claim 1  wherein said sheets of metallic material are anodized or coated with a polymer coating prior to formation of said honeycomb. 
     
     
         4 . An improved method for making honeycomb according to  claim 3  wherein said sheets of metallic material are anodized and coated with a polymer coating prior to formation of said honeycomb 
     
     
         5 . An improved method for making honeycomb according to  claim 1  wherein said sheets of metallic material comprise aluminum or aluminum alloy. 
     
     
         6 . An improved method for making a honeycomb according to  claim 5  wherein said metallic honeycomb is phosphoric acid etched aluminum or aluminum alloy. 
     
     
         7 . An improved method for making honeycomb according to  claim 1  wherein said corrosion resistant layer consists essentially of polyamideimide. 
     
     
         8 . An improved method for making honeycomb according to  claim 2  wherein said corrosion resistant layer consists essentially of polyamideimide. 
     
     
         9 . An improved method for making honeycomb according to  claim 3  wherein said corrosion resistant layer consists essentially of polyamideimide. 
     
     
         10 . An improved method for making honeycomb according to  claim 4  wherein said corrosion resistant layer consists essentially of polyamideimide. 
     
     
         11 . An improved method for making honeycomb according to  claim 5  wherein said corrosion resistant layer consists essentially of polyamideimide. 
     
     
         12 . An improved method for making honeycomb according to  claim 6  wherein said corrosion resistant layer consists essentially of polyamideimide.