Unlock instant, AI-driven research and patent intelligence for your innovation.

A high bonding and corrosion resistant anodizing method based on aluminum alloy surface

An aluminum alloy surface, anodic oxidation technology, applied in the direction of anodic oxidation, surface reaction electrolytic coating, coating, etc., can solve problems such as aluminum alloy corrosion, and achieve the effect of high adhesion and corrosion resistance

Active Publication Date: 2021-05-21
CHINALCO MATERIALS APPL RES INST CO LTD +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the method of anodizing aluminum alloy is used to improve the interface bonding strength between the adhesive and aluminum alloy, because the porous anodized film formed by anodized aluminum alloy can penetrate into the adhesive and be cured by high temperature baking. The formed glue layer will form a "pinning" inside the oxide layer, thereby greatly enhancing the interface bonding strength with the aluminum alloy; however, since the pores of the porous oxide film are open, the infiltration of external corrosive media such as Cl-, etc. will easily cause aluminum Alloy Corrosion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high bonding and corrosion resistant anodizing method based on aluminum alloy surface
  • A high bonding and corrosion resistant anodizing method based on aluminum alloy surface
  • A high bonding and corrosion resistant anodizing method based on aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high bonding and corrosion-resistant anodic oxidation method 1 based on an aluminum alloy surface, said method comprising the steps of:

[0033] (1) Degrease the aluminum alloy surface at 50°C for 1 min in a mixed solution of sodium hydroxide, sodium phosphate and sodium carbonate with a mass volume concentration ratio (unit: g / L) of 5:10:20;

[0034] (2) Clean the aluminum alloy surface with 60g / L sodium hydroxide at 65°C for 1min, 160g / L sulfuric acid at 10°C for 4min, and an ultrasonic machine at 30Hz for 1min;

[0035] (3) A mixed solution of sulfuric acid and aluminum sulfate with a mass volume concentration ratio (unit: g / L) of 160:1, at 1.0A / dm 2 The current density and 15 ℃, the surface of the cleaned aluminum alloy as anodized 10mim.

[0036] (4) Sealing the oxidized aluminum alloy surface at 90° C. for 5 minutes with a mixed additive consisting of 100 ppm of acetate and 10 ppm of additive phosphonocarboxylic acid copolymer to obtain an anodized film on the ...

Embodiment 2

[0039] A high bonding and corrosion-resistant anodic oxidation method 2 based on an aluminum alloy surface, said method comprising the steps of:

[0040] (1) Degrease the aluminum alloy surface at 70°C for 4 minutes in a mixed solution of sodium hydroxide, sodium phosphate and sodium carbonate with a mass volume concentration ratio (unit: g / L) of 10:20:40;

[0041] (2) Clean the aluminum alloy surface with 100g / L sodium hydroxide at 75°C for 3min, 200g / L sulfuric acid at 30°C for 20min, and an ultrasonic machine at 40Hz for 2min;

[0042] (3) A mixed solution of sulfuric acid and aluminum sulfate with a mass volume concentration ratio (unit: g / L) of 200:15, at 2.0A / dm 2 The current density and 25 ° C, the surface of the cleaned aluminum alloy as an anodic oxidation 50mim;

[0043] (4) After treating the oxidized aluminum alloy surface at 100° C. for 50 minutes with a mixed additive composed of 500 ppm of additive borate, citrate and 100 ppm of additive phosphonocarboxylic aci...

Embodiment 3

[0046] A method 3 of anodic oxidation based on high adhesion and corrosion resistance of aluminum alloy surface, said method comprising the steps of:

[0047] (1) Degrease the aluminum alloy surface at 55°C for 2 minutes in a mixed solution of sodium hydroxide, sodium phosphate and sodium carbonate with a mass volume concentration ratio (unit: g / L) of 9:14:35;

[0048] (2) Clean the aluminum alloy surface with 70g / L sodium hydroxide at 67°C for 2 minutes, 170g / L sulfuric acid at 21°C for 9 minutes, and an ultrasonic machine at 45Hz for 4 minutes;

[0049] (3) A mixed solution of sulfuric acid and aluminum sulfate with a mass volume concentration ratio (unit: g / L) of 188:8, at 1.4A / dm 2 The current density and 21 ° C, the surface of the cleaned aluminum alloy as an anodic oxidation 30mim;

[0050](4) Use 280ppm of additive borate, citrate, phosphate and 60ppm of additive phosphonocarboxylic acid copolymer, isopropene phosphonic acid homopolymer, maleic anhydride acrylic acid c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides an anodic oxidation method based on high adhesion and corrosion resistance of the aluminum alloy surface, comprising the following steps: degreasing the aluminum alloy surface in a mixed solution of sodium hydroxide, sodium phosphate and sodium carbonate; , pickling and ultrasonic cleaning the surface of the degreasing aluminum alloy; using a mixed solution of sulfuric acid and aluminum sulfate to anodize the surface of the aluminum alloy; Aluminum alloy surface anodized film. The anodized film based on the surface of the aluminum alloy prepared by the method is an oxide film with no powder on the surface and a pore size of 2-20nm, and the volume expands due to the hydration of the oxide film during the sealing process, so that the pores of the oxide film appear as The porous form with internal plugging and open surface has high adhesiveness and corrosion resistance.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to an anodic oxidation method based on the high adhesion and corrosion resistance of the aluminum alloy surface. Background technique [0002] Due to its high specific strength, specific modulus, fracture toughness and corrosion resistance, aluminum alloys have been widely used in various industries, especially aerospace, rail transit and new energy vehicles that require high lightweight. [0003] The application of aluminum alloy is inseparable from the connection. The connection methods between aluminum parts include welding, riveting, mechanical connection or glue joint. The glue joint has the advantages of small structural weight gain, short time, low cost, high efficiency and incorrect Bonded components have the advantages of new stress concentration and other advantages, and are favored by people; [0004] The bonding strength depends on the cohesive strength of the adhesiv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16C25D11/08C25D11/24
CPCC25D11/08C25D11/16C25D11/246
Inventor 李英东赵丕植冯莹娟曹海龙
Owner CHINALCO MATERIALS APPL RES INST CO LTD