Pretreated aluminum alloy tab stock

Abstract

Described herein are 5xxx series aluminum alloy substrates and methods of making 5xxx series aluminum alloy substrates having a pretreatment fdm on a surface of the substrate. A beverage tab may comprise a pretreated 5xxx series aluminum alloy substrate. A method of making a 5xxx series aluminum alloy substrate as described herein includes producing a pretreatment film on a surface of a 5xxx series aluminum alloy substrate to provide a pretreated 5 xxx series aluminum alloy substrate and controlling a coat weight of the pretreatment film to no greater than 10 mg/ft2.

1 . A method of making a 5xxx series aluminum alloy substrate, the method comprising:
 producing a pretreatment film on a surface of a 5xxx series aluminum alloy substrate to provide a pretreated 5xxx series aluminum alloy substrate; and   controlling a coat weight of the pretreatment film to no greater than 10 mg/ft 2 .   
     
     
         2 . The method of  claim 1 , wherein producing the pretreatment film comprises contacting the 5xxx series aluminum alloy substrate with a pretreatment solution. 
     
     
         3 . The method of  claim 2 , wherein the pretreatment solution comprises chromium, molybdenum, titanium, zirconium, manganese, or combinations thereof. 
     
     
         4 . The method of  claim 2 , wherein the pretreatment solution comprises trivalent chromium (Cr(III)), phosphates, or combinations thereof. 
     
     
         5 . The method of  claim 2 , wherein the pretreatment solution comprises compounds of titanium and zirconium (Ti/Zr). 
     
     
         6 . The method of  claim 2 , wherein contacting comprises spraying, roll coating, or submerging at least a portion of the 5xxx series aluminum alloy substrate. 
     
     
         7 . The method of  claim 1 , wherein the coat weight of the pretreatment film is from 3 mg/ft 2  to 9 mg/ft 2 . 
     
     
         8 . The method of  claim 1 , wherein the pretreatment film has a thickness of up to 300 nm. 
     
     
         9 . The method of  claim 1 , wherein the pretreated 5xxx series aluminum alloy substrate has a coefficient of friction of less than 0.5 after 2 cycles according to ASTM #G99. 
     
     
         10 . The method of  claim 1 , further comprising degreasing at least a portion of the surface of the 5xxx series aluminum alloy substrate prior to producing the pretreatment film. 
     
     
         11 . The method of  claim 10 , wherein degreasing comprises contacting at least a portion of the 5xxx series aluminum alloy substrate with an acidic solution, an alkaline solution, an alkaline organic compound, or combinations thereof. 
     
     
         12 . The method of  claim 1 , further comprising preheating the 5xxx series aluminum alloy substrate to a temperature of less than 300° C. prior to producing the pretreatment film. 
     
     
         13 . The method of  claim 1 , wherein the 5xxx series aluminum alloy substrate is AA5182. 
     
     
         14 . An aluminum alloy substrate prepared according to the method of  claim 1 . 
     
     
         15 . The aluminum alloy substrate of  claim 14 , wherein the coat weight of the pretreatment film is from 3 mg/ft 2  to 9 mg/ft 2 . 
     
     
         16 . The aluminum alloy substrate of  claim 15 , wherein the pretreatment film has a thickness of up to 300 nm. 
     
     
         17 . The aluminum alloy substrate of  claim 14 , wherein the 5xxx series aluminum alloy substrate has a coefficient of friction of less than 0.5 after 2 cycles according to ASTM #G99. 
     
     
         18 . The aluminum alloy substrate of  claim 14 , wherein the pretreatment film comprises trivalent chromium. 
     
     
         19 . The aluminum alloy substrate of  claim 14 , wherein the 5xxx series aluminum alloy substrate is AA5182. 
     
     
         20 . A beverage container comprising the aluminum alloy substrate of  claim 1 . 
     
     
         21 . The beverage container of  claim 20 , further comprising a lxxx series aluminum alloy or a 3xxx series aluminum alloy. 
     
     
         22 . A beverage tab comprising the aluminum alloy substrate of  claim 14 .