Surface-treated aluminum material having excellent adhesiveness to resins, method for manufacturing the same, and surface-treated aluminum material-resin bonded body

Patent metadata

Field	Value
Publication number	US-2018230618-A1
Application number	US-201615751409-A
Country	US
Kind code	A1
Filing date	Aug 8, 2016
Priority date	Aug 13, 2015
Publication date	Aug 16, 2018
Grant date	—

Abstract

The present disclosure provides a surface-treated aluminum material having excellent adhesiveness to resins, on the surface of which an oxide film is formed, the oxide film comprising a surface-side porous aluminum oxide film having a thickness of 20 to 500 nm and a base-side barrier aluminum oxide film having a thickness of 3 to 30 nm, wherein small pores each having a diameter of 5 to 30 nm are formed on the porous aluminum oxide film, and the length of cracks formed in a boundary between the porous aluminum oxide film and the barrier aluminum oxide film is not more than 50% of the length of the boundary, a method for manufacturing the surface-treated aluminum material, and a surface-treated aluminum material-resin bonded body, comprising the surface-treated aluminum material and a resin that covers the surface of the oxide film formed thereon.

First claim

1 . A surface-treated aluminum material having excellent adhesiveness to resins, on a surface of which an oxide film is formed, the oxide film comprising a surface-side porous aluminum oxide film having a thickness of 20 to 500 nm and a base-side barrier aluminum oxide film having a thickness of 3 to 30 nm, wherein small pores each having a diameter of 5 to 30 nm are formed in the porous aluminum oxide film, and the length of cracks formed in a boundary between the porous aluminum oxide film and the barrier aluminum oxide film is not more than 50% of the length of the boundary.

2 . A method for manufacturing the surface-treated aluminum material having excellent adhesiveness to resins according to claim 1 , comprising
conducting alternating-current electrolytic treatment using an electrode made of an aluminum material that is continuously fed and supplied into an electrolyte solution and a fixed counter electrode, the electrolyte solution being an alkaline aqueous solution having a pH of 9 to 13 at a solution temperature of 35 to 85° C., under conditions of a frequency of 10 to 100 Hz, a current density of 4 to 50 A/dm 2 , and a period of electrolysis time of 5 to 300 seconds, thereby forming an oxide film on the surface of a portion of the aluminum material opposed to the counter electrode, wherein the electrode made of an aluminum material and the counter electrode are continuously energized, and time required for the current density in the electrolytically treated aluminum material portion to reach below 1 A/dm 2 after the elapse of the electrolysis time is set to not more than 10.0 seconds.

3 . The method for manufacturing the surface-treated aluminum material having excellent adhesiveness to resins according to claim 2 , wherein an interelectrode distance between the electrode made of the aluminum material and the counter electrode is 2 to 150 mm.

4 . A surface-treated aluminum material-resin bonded body, comprising the surface-treated aluminum material according to claim 1 and a resin that covers the surface of the oxide film formed on the surface-treated aluminum material.

Assignees

• Uacj Corp

Inventors

• Hasegawa Shinichi
• Mimura Tatsuya
• Honkawa Yukio
• Maezono Toshiki

Classifications

• B05D7/24

  for applying particular liquids or other fluent materials · CPC title

• C25D11/06 Primary

  characterised by the electrolytes used · CPC title

• B05D3/007

  After-treatment · CPC title

• C25D11/04 Primary

  of aluminium or alloys based thereon · CPC title

• C25D11/024

  Anodisation under pulsed or modulated current or potential · CPC title