Formation of conversion coating with enhanced adhesion promotion

Abstract

A conversion coating system, a bifunctional conversion coating, a coated product including the bifunctional conversion coating, and a method of manufacture thereof. The conversion coating system includes a bifunctional polymeric additive composition and a conversion coating composition, wherein the conversion coating composition includes a dye compound. The conversion coating composition and the bifunctional polymeric additive composition are configured to be provided separately, combined, or a combination thereof.

What is claimed is: 
     
         1 . A conversion coating system comprising:
 a bifunctional polymeric additive composition; and   a conversion coating composition, wherein the conversion coating composition comprises a dye compound,   wherein the conversion coating composition and the bifunctional polymeric additive composition are configured to be provided separately, combined, or a combination thereof.   
     
     
         2 . The conversion coating system of  claim 1 , wherein the conversion coating composition comprises less than 1 part per million of hexavalent chromium. 
     
     
         3 . The conversion coating system of  claim 1 , wherein the conversion coating composition comprises a zirconium compound, a trivalent chromium compound, a titanium compound, a cerium compound, a lanthanum compound, a manganese compound, a silane compound, or a combination thereof. 
     
     
         4 . The conversion coating system of  claim 1 , wherein the bifunctional polymeric additive composition comprises a water-soluble polymer comprising a polymer backbone with a first functional group and a second functional group. 
     
     
         5 . The conversion coating system of  claim 3 , wherein the first functional group is a phosphonic acid group, a phosphoric acid group, or a combination thereof; and wherein the second functional group is a carboxylic acid functional group. 
     
     
         6 . The conversion coating system of  claim 3 , wherein the water-soluble polymer is poly(vinyl phosphonic acid-co-acrylic acid) with a ratio of phosphonic acid functional groups to carboxylic acid functional groups of 90:10 to 10:90. 
     
     
         7 . The conversion coating system of  claim 1 , wherein a ratio of the conversion coating composition to the bifunctional polymeric additive composition is 90:10 to 99.9999:0.0001. 
     
     
         8 . A bifunctional conversion coating comprising
 a bifunctional polymeric additive;   a metal compound, a metalloid compound, or a combination thereof,   wherein the metal compound comprises a trivalent chromium compound, a zirconium compound, a titanium compound, a cerium compound, a lanthanum compound, a manganese compound, or a combination thereof,   wherein the metalloid compound comprises a silane compound; and   a dye compound,   wherein the ratio of the bifunctional polymeric additive to the metal compound, the metalloid compound, or the combination thereof is 1:1 to 1:1000.   
     
     
         9 . The bifunctional conversion coating of  claim 8 , wherein the coating has a coating weight of 10 milligrams per square foot to 55 milligrams per square foot. 
     
     
         10 . A coated substrate comprising the bifunctional conversion coating of  claim 8  on a surface of the coated substrate. 
     
     
         11 . The coated substrate of  claim 10 , wherein the bifunctional conversion coating has a color that is different than a color of the uncoated substrate, wherein the color of the bifunctional conversion coating is macroscopically visible during irradiation with visible light, during irradiation with ultraviolet light, after irradiation with ultraviolet light, or a combination thereof. 
     
     
         12 . The coated substrate of  claim 10 , wherein the coated substrate further comprises a topcoat, wherein the bifunctional conversion coating and the topcoat comprise a layered coating, wherein the layered coating has a dry adhesion rating of greater than 4B as measured in accordance with ASTM D3359 Method B. 
     
     
         13 . The coated substrate of  claim 12 , wherein the topcoat is a paint, a primer, an adhesive, a sealant, an erosion coating, an enamel, a lacquer, a varnish, an ink, or a combination thereof. 
     
     
         14 . A method of manufacturing a coated substrate, the method comprising:
 applying a conversion coating composition on a substrate to provide a conversion coating on a surface of the substrate;   applying a bifunctional polymeric additive composition to the conversion coating on the surface of the substrate to convert the conversion coating to a bifunctional conversion coating on the surface of the substrate; and   rinsing the bifunctional conversion coating on the surface of the substrate with a rinse solution to provide a coated substrate.   
     
     
         15 . The method of  claim 14 , wherein the conversion coating composition and the bifunctional polymeric additive composition are applied to the substrate simultaneously to provide the bifunctional conversion coating on the surface of the substrate. 
     
     
         16 . The method of  claim 14 , wherein the rinse solution comprises the bifunctional polymeric additive composition or an additional portion of the bifunctional polymeric additive composition. 
     
     
         17 . The method of  claim 14 , wherein the applying of the bifunctional polymeric additive composition and the rinsing are performed simultaneously. 
     
     
         18 . The method of  claim 14 , wherein the substrate comprises aluminum, titanium, magnesium, cadmium, zinc, nickel, tin, silver, copper, iron, or a combination thereof. 
     
     
         19 . The method of  claim 14 , further comprising applying a topcoat solution to the coated substrate to provide a topcoat, wherein the bifunctional conversion coating is between the substrate and the topcoat. 
     
     
         20 . The method of  claim 19 , wherein the applying of the topcoat solution is performed about one minute to about twelve months after the rinsing of the bifunctional conversion coating on the surface of the substrate.