Method of protecting surfaces from corrosion

Abstract

A method of protecting surfaces from corrosion calls for providing a coating material containing polyisocyanates with unreacted, active NCO groups; and applying the coating material to a rust covered surface, whereby the free NCO groups in the coating material react with the moisture in the rust to dehydrate the rust and produce a strong coating which keeps out water and oxygen which corrode surfaces. The active NCO content is about 3% to about 20% NCO groups. Also disclosed is a composition for coating an iron surface, the composition comprising polyisocyanates whose NCO content is between 5% and 30%; and aluminum flakes at about 5% to about 50% by weight.

1 - 10 . (cancelled)  
     
     
         11 : A method of protecting a surface from moisture and air, the method comprising: 
 providing a coating material consisting essentially of polyisocyanates with unreacted, active NCO groups, non-leafing aluminum flakes, xylene, isobutyl acetate, thickener gel and molecular sieve; and applying the coating material to the surface,    whereby the active NCO groups in the coating material react with moisture in the environment to produce a strong coating which keeps out water and oxygen which harm surfaces.    
     
     
         12 : The method of  claim 11 , wherein the active NCO content is about 3% to about 20% by weight.  
     
     
         13 : The method of  claim 11 , wherein the active NCO content is about 5% to about 15% NCO groups by weight.  
     
     
         14 : The method of  claim 11 , wherein the active NCO content is about 7% to about 10% NCO groups by weight.  
     
     
         15 : A composition for coating a surface, the composition consisting essentially of polyisocyanates whose NCO content is between about 5% and about 30% by weight; aluminum flakes at about 5% to about 50% by weight; xylene; isobutyl acetate; thickener gel; and molecular sieve.