Aluminum material surface treatment method, surface treatment apparatus, and treated surface aluminum material

Abstract

A coating is formed by coating a treatment solution containing a 20-400 ppm total, calculated as titanium and calculated as zirconium, of a titanium fluoride compound and/or a zirconium fluoride compound on the surface of an aluminum material so that the total of titanium and zirconium is 4-25 mg/m2, and drying.

1 . A surface treatment method of an aluminum material, comprising the steps of:
 applying a treatment solution containing at least one kind of a titanium fluoride compound and a zirconium fluoride compound to a surface of an aluminum material; and   drying the treatment solution applied to the surface of the aluminum material, thereby forming a coating film, wherein:   in the treatment solution to be applied to the surface of the aluminum material, a total of a concentration of the titanium fluoride compound in terms of titanium and a concentration of the zirconium fluoride compound in terms of zirconium is 20 to 400 ppm; and   the treatment solution is applied to the surface of the aluminum material so that a total of titanium and zirconium is 4 to 25 mg/m 2 .   
     
     
         2 . A surface treatment apparatus of an aluminum material, comprising:
 an application unit that applies a treatment solution containing at least one kind of a titanium fluoride compound and a zirconium fluoride compound to a surface of an aluminum material; and   a drying unit that dries the treatment solution applied to the surface of the aluminum material to thereby form a coating film, wherein:   in the treatment solution to be applied to the surface of the aluminum material, a total of a concentration of the titanium fluoride compound in terms of titanium and a concentration of the zirconium fluoride compound in terms of zirconium is 20 to 400 ppm; and   in the application unit, the treatment solution is applied to the surface of the aluminum material so that a total of titanium and zirconium is 4 to 25 mg/m 2 .   
     
     
         3 . The surface treatment apparatus of an aluminum material according to  claim 2 , wherein:
 the aluminum material is an aluminum sheet; and   the surface treatment apparatus further comprises a feeding unit that allows the aluminum sheet to pass through the application unit and the drying unit.   
     
     
         4 . A coating-type surface-treated aluminum material comprising an aluminum material, and a coating film formed on a surface of the aluminum material, the coating film containing at least one kind of titanium and zirconium,
 wherein, in the coating film, a total amount of a coating amount of titanium and a coating amount of zirconium is 3 to 17 mg/m 2 , and a ratio (fluorine amount/sum of titanium amount and zirconium amount) of a fluorine amount in the surface to a sum of a titanium amount in the surface and a zirconium amount in the surface is 4.0 or less.