Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mixed acid anodic oxidation method for aluminum alloy structure bonding

Anodizing and aluminum alloy technology, applied in the direction of anodizing, can solve the problems of high energy consumption and complex process, and achieve the effect of less energy consumption, simple equipment and wide application range

Inactive Publication Date: 2008-10-08
BEIJING UNIV OF CHEM TECH
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this, the modified boric acid / sulfuric acid anodizing process is the frontier of chromic acid anodizing replacement process research. This kind of research work mainly focuses on the optimization of anodizing process parameters, anodizing pretreatment or posttreatment. There are disadvantages such as complex process and high energy consumption

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
  • Mixed acid anodic oxidation method for aluminum alloy structure bonding
  • Mixed acid anodic oxidation method for aluminum alloy structure bonding
  • Mixed acid anodic oxidation method for aluminum alloy structure bonding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mixed acid anodizing treatment of duralumin surface

[0024] Using duralumin LY12 (alloy grade), its composition is (mass fraction, %): Fe≤0.50, Si≤0.50, 0.3≤Mn≤0.9, 3.8≤Cu≤4.9, 1.2≤Mg≤1.8, Zn≤0.25, Cr ≤0.10.

[0025] A: The samples are pretreated as follows in sequence:

[0026] 1. After polishing the sample, immerse it in the prepared 55% NaOH alkaline solution, degrease at 50°C, take out the test piece after 5 minutes, and wash it with water.

[0027] 2. Prepare an aqueous solution with a mass percent concentration of nitric acid of 30% and hydrofluoric acid of 10%, and pour it into an acid-resistant tank; put the sample after alkaline degreasing treatment into this solution, and remove the ash at room temperature for 60 seconds After that, take it out and wash it with water.

[0028] 3. Prepare a mixed aqueous solution with a concentration of sulfuric acid of 350g / L and ferrous sulfate of 150g / L, pre-roughen the sample after ash removal at 65°C, take it out after...

Embodiment 2

[0031] Mixed Acid Anodizing Treatment of Wrought Aluminum Surface

[0032] Using wrought aluminum LD5, its composition is (mass percentage): Fe≤0.7, 0.7≤Si≤1.2, 0.3≤Mn≤0.9, 1.8≤Cu≤2.6, 0.4≤Mn≤0.8, 0.4≤Mg≤0.8, Zn≤0.3.

[0033] A: Same as Example 1, step 1, 2, and 3 of step A are performed in sequence.

[0034] B: Prepare an anodic oxidation solution with a sulfuric acid concentration of 50g / L, boric acid 3g / L and sodium phosphate 50g / L, and pour it into the oxidation tank with a constant temperature water bath at 35°C; put the pre-roughened sample into the tank, Direct current anodizing; the cathode is lead plate, the area ratio of cathode and anode is 2:1, the distance between cathode and anode is more than 30 cm, under the condition of stirring, constant voltage 35V anodization. After oxidizing for 10 minutes, turn off the power to take out the sample, wash it with water, and dry it in a 50°C oven.

Embodiment 3

[0036] Mixed acid anodic oxidation treatment method for cast aluminum surface

[0037] Cast aluminum 201 is used, and its composition is (mass fraction, %): Fe≤0.30, Si≤0.30, 0.6≤Mn≤1.0, 4.5≤Cu≤5.3, 0.15≤Si≤0.35, Mg≤0.05.

[0038] A: Same as Example 1, step 1, 2, and 3 of step A are performed in sequence.

[0039] B: Prepare an anodic oxidation mixture solution with a sulfuric acid concentration of 10g / L, boric acid 5g / L, and phosphoric acid 50g / L, and pour it into the oxidation tank with a constant temperature water bath at 35°C; put the pretreated sample into the tank, and Direct current anodization; the cathode is made of lead plate, the area ratio of cathode and anode is 2:1, the distance between cathode and anode is more than 30 cm, under the condition of stirring, constant voltage 20V anodization. After oxidizing for 30 minutes, turn off the power to take out the sample, wash it with water, and dry it in an oven at 50°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

No PUM Login to View More

Abstract

The invention relates to a mixed acid anodizing method for the bonding of an aluminum structure. The anodizing liquid is mixed in proportion through sulfuric acid, boric acid, phosphoric acid or phosphate and water. A voltage-controlled manner is adopted in the anodizing, thus the anodized processing can be proceeded for the aluminum surface before the bonding. The method of the invention is stable with easy operation, simple equipment, less energy consumption and a wide range of applications, which has the characteristics of less human environmental pollution, low blow-down cost and so on, so that the chromium salts and other toxic material substances used in the oxidation solution of the traditional methods can be replaced to meet the requirements of environmental protection. Compared with the traditional phosphoric acid anodizing and the boric acid, sulfuric acid anodizing methods, the invention has the characteristics of high corrosion resistance and excellent adhesive performance, which is an ideal substitute for the traditional chromium acid anodizing method.

Description

technical field [0001] The invention relates to a mixed acid anodic oxidation method for aluminum alloy structure bonding, which belongs to the technical field of aluminum alloy bonding and coating pretreatment. Background technique [0002] Aluminum alloy bonding is widely used in industries such as aerospace, automotive, defense, shipbuilding, general machinery and construction. According to the loading of the bonded objects, it can be divided into structural bonding, secondary structural bonding and non-structural bonding. Structural bonding means that the bonded workpieces bear large static or dynamic loads during the service period. In addition, structural bonding parts are usually used in harsh environments such as high temperature and high humidity, requiring good initial bonding performance of the bonded joints And resistance to heat and humidity, non-adhesive parts also have better corrosion resistance. Chromic acid anodizing (CAA) has become the most widely used ...

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
IPC IPC(8): C25D11/08
Inventor 左禹张金生赵旭辉熊金平
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com