Thermally modified oxide based pretreatments for metals and methods of making the same

Abstract

Provided herein are corrosion resistant metal substrates and methods for producing the same by thermal modification. The disclosure provides methods for producing corrosion resistant substrates by producing a pretreatment film on a surface of a metal substrate and heating the pretreated metal substrate. In particular, the metal substrate and/or the pretreated metal substrate of these methods is in an F temper, a T4 temper, or a T6 temper.

1 . A method of making a corrosion resistant substrate, the method comprising:
 producing a pretreatment film on a surface of a metal substrate to provide a pretreated metal substrate; and   heating the pretreated metal substrate at a first temperature to provide the corrosion resistant substrate,   wherein the first temperature is greater than 300° C., and   wherein the metal substrate and/or the pretreated metal substrate is in an F temper, a T4 temper, or a T6 temper.   
     
     
         2 . The method of  claim 1 , wherein the metal substrate comprises an aluminum alloy. 
     
     
         3 . The method of  claim 2 , wherein the metal substrate comprises a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy. 
     
     
         4 . (canceled) 
     
     
         5 . The method of  claim 1 , wherein the pretreatment film comprises an oxide layer. 
     
     
         6 . The method of  claim 5 , wherein the oxide layer comprises an aluminum oxide, a silicon oxide, a titanium oxide, a chromium oxide, a manganese oxide, a nickel oxide, a yttrium oxide, a zirconium oxide, a molybdenum oxide, or combinations thereof. 
     
     
         7 . The method of  claim 1 , wherein producing the pretreatment film comprises applying an inorganic pretreatment composition to the surface of the metal substrate. 
     
     
         8 . The method of  claim 1 , wherein producing the pretreatment film comprises anodizing the surface of the metal substrate. 
     
     
         9 . The method of  claim 1 , wherein producing the pretreatment film comprises flame hydrolyzing the surface of the metal substrate. 
     
     
         10 . The method of  claim 1 , wherein the first temperature is from 300° C. to 550° C. 
     
     
         11 . The method of  claim 1 , wherein the heating comprises heating the pretreated metal substrate at the first temperature for less than 30 minutes. 
     
     
         12 . The method of  claim 1 , wherein the heating further comprises heating the pretreated metal substrate at a second temperature. 
     
     
         13 . The method of  claim 12 , wherein the second temperature is lower than the first temperature. 
     
     
         14 . The method of  claim 12 , wherein the second temperature is from 75° C. to 250° C. 
     
     
         15 . The method of  claim 12 , wherein the heating comprises heating the pretreated metal substrate at the second temperature from 1 hour to 48 hours. 
     
     
         16 . The method of  claim 1 , wherein the metal substrate is a continuous coil. 
     
     
         17 . A corrosion resistant coil comprising:
 an aluminum alloy continuous coil, wherein a surface of the aluminum alloy continuous coil comprises an inorganic pretreatment film, and   wherein the aluminum alloy continuous coil is in an F temper, a T4 temper, or a T6 temper.   
     
     
         18 . The method of  claim 17 , wherein the aluminum alloy continuous coil comprises a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy. 
     
     
         19 . The corrosion resistant coil of  claim 17 , wherein the inorganic pretreatment film comprises an oxide layer. 
     
     
         20 . The corrosion resistant coil of  claim 19 , wherein the oxide layer comprises an aluminum oxide, a silicon oxide, a titanium oxide, a chromium oxide, a manganese oxide, a nickel oxide, a yttrium oxide, a zirconium oxide, a molybdenum oxide, or combinations thereof. 
     
     
         21 . A method of making a corrosion resistant substrate, the method comprising:
 producing a pretreatment film on a surface of a metal substrate to provide a pretreated metal substrate; and   heating the pretreated metal substrate at a first temperature to provide the corrosion resistant substrate,   wherein the metal substrate and/or the pretreated metal substrate is in an F temper, and   wherein the corrosion resistant substrate is in a T5 temper, a T6 temper, a T61 temper, a T7 temper, T8x temper, or a T9 temper.