Powder corrosion and chip-resistant coating

Abstract

A powder composition including a resin and from 5% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, optionally including from 0% to 65%, by weight based on powder composition weight, zinc, the composition being substantially free from pigment providing a metallic effect is provided. The corrosion-inhibiting pigment may be present in amounts of up to 50%, by weight based on powder composition weight, for example, up to 35%. A method for coating a substrate with the powder composition and the coated substrate so formed are also provided.

1 . A powder composition comprising a resin and from 5% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, said composition being substantially free from pigment providing a metallic effect. 
     
     
         2 . The composition according to  claim 1  further comprising from 0% to 65%, by weight based on powder composition weight, zinc. 
     
     
         3 . The composition according to  claim 1  further comprises at least one technology selected from the group consisting of toughening, foaming, and reinforcing. 
     
     
         4 . A method for coating a substrate comprising:
 forming a powder composition comprising a resin and from 5% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, said composition being substantially free from pigment providing a metallic effect;   applying said powder composition to said substrate; and   heating said applied powder composition to fuse and cure said composition.   
     
     
         5 . The method according to  claim 3  wherein said powder composition further comprises from 0% to 65%, by weight based on powder composition weight, zinc. 
     
     
         6 . The method according to  claim 3  wherein said powder composition further comprises at least one technology selected from the group consisting of toughening, foaming, and reinforcing. 
     
     
         7 . A method for coating a substrate comprising:
 forming a first powder composition comprising a resin and from 0% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, said first powder composition being substantially free from pigment providing a metallic effect;   applying said first powder composition to said substrate;   forming a second powder composition comprising a resin and from 5% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, said composition being substantially free from pigment providing a metallic effect;   applying said second powder composition to said substrate coated with said first powder composition; and   heating said applied powder compositions to fuse and cure said compositions.   
     
     
         8 . The method according to  claim 7  wherein said first and said second powder composition, independently, further comprise from 0% to 65%, by weight based on powder composition weight, zinc. 
     
     
         9 . A coated substrate comprising said substrate bearing a coating comprising
 a resin and from 5% to 70%, by weight based on powder composition weight, of a corrosion-inhibiting pigment, said composition being substantially free from pigment providing a metallic effect.   
     
     
         10 . The coated substrate of  claim 9  wherein said powder composition further comprises from 0% to 65%, by weight based on powder composition weight, zinc.