Surface Treatment Agent, and Aluminum or Aluminum Alloy Material Having Surface Treatment Coating and Method of Producing the Same

Abstract

The present invention addresses the problem of providing a surface treatment agent for aluminum or aluminum alloy materials, which is capable of forming, on an aluminum or an aluminum alloy material, a surface treatment coating that has excellent corrosion resistance and has excellent corrosion resistance even when the coating is exposed to a high temperature. The problem is solved by a surface treatment agent which is used for surface treatment of an aluminum or an aluminum alloy material and which contains a trivalent chromium-containing ion (A), at least one ion (B) selected from a titanium-containing ion and a zirconium-containing ion, a zinc-containing ion (C), a free fluorine ion (D), and a nitrate ion (E).

1 . A surface treatment agent used for surface treatment of an aluminum or an aluminum alloy material, wherein the surface treatment agent comprises a trivalent chromium-containing ion (A), at least one ion (B) selected from a titanium-containing ion and a zirconium-containing ion, a zinc-containing ion (C), a free fluorine ion (D), and a nitrate ion (E). 
     
     
         2 . A method of producing an aluminum or an aluminum alloy material having a surface treatment coating, the method comprising a contact step of contacting the surface treatment agent according to  claim 1  on or over a surface of an aluminum or an aluminum alloy material. 
     
     
         3 . An aluminum or an aluminum alloy material having a surface treatment coating obtainable by the method according to  claim 2 .