High strength aluminum alloy anodizing electrolyte, preparation method of high strength aluminum alloy anode oxide film and high strength aluminum alloy workpiece

An anodic oxidation film and anodic oxidation technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of reducing the fatigue resistance of the substrate, low porosity, polluting the environment, etc., and achieve suitable industrial promotion and application , The wastewater treatment process is simple, the preparation process is easy to operate

Active Publication Date: 2019-10-18
NANCHANG HANGKONG UNIVERSITY
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, anodic oxidation is an important means to improve the corrosion resistance of 2××× and 7××× series aluminum alloys. Among them, sulfuric acid anodic oxidation, chromic acid anodic oxidation and boric sulfuric acid anodic oxidation are the most widely used in the aviation industry, but these There are certain deficiencies in the process: the chromic acid anodic oxidation film layer is dense, the porosity is low, and the fatigue strength of the substrate is not damaged, but Cr(VI) pollutes the environment, which leads to its use being restricted; although the sulfuric acid anodic oxidation has little pollution, However, it will reduce the fatigue resistance of the base material, and the concentration of sulfuric acid is relatively high, so it is not suitable for 2××× alloys with high Cu content; while the boron-sulfuric acid anodizing process does not have the above-mentioned shortcomings, but it is restricted by Boeing’s patent. Difficult to use on a large scale

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
  • High strength aluminum alloy anodizing electrolyte, preparation method of high strength aluminum alloy anode oxide film and high strength aluminum alloy workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Configure 2L of anodic oxidation electrolyte including 0.1mol / L phytic acid, the steps are as follows:

[0037] Add 1L of deionized water to the stainless steel electrolytic cell;

[0038] Then slowly add 132mL of phytic acid solution with a mass fraction of 70% and stir until mixed evenly;

[0039] Then add water to 2L, and adjust the pH to 2.0-2.5 with 1mol / L KOH solution;

[0040] Let stand for 24h.

[0041] (2) The preparation method of 2024 aluminum alloy (Al-Cu-Mg series) anodic oxidation film, the steps are as follows:

[0042] Put the 2024 aluminum alloy in the alkaline etching solution at 50°C for 3 minutes, and then wash it with hot water and cold water in turn. The alkaline etching solution is prepared by dissolving sodium hydroxide and sodium sulfide in deionized water. The hydrogen in the alkaline etching solution is The concentration of sodium oxide is 60g / L, and the concentration of sodium sulfide is 5g / L;

[0043] Immediately immerse the 2024 alumi...

Embodiment 2

[0047] (1) Configure 2L of anodic oxidation electrolyte including 0.2mol / L phytic acid, the steps are as follows:

[0048] Add about 1L of deionized water to the stainless steel electrolytic cell;

[0049] Then slowly add 132 mL of phytic acid solution with a mass fraction of 70% and stir until completely dissolved;

[0050] Then add water to 2L, and adjust the pH to 2.0-2.5 with 1mol / L KOH solution;

[0051] Let stand for 24h.

[0052] (2) The preparation method of 2024 aluminum alloy (Al-Cu-Mg series) anodic oxidation film, the steps are as follows:

[0053] Put the 2024 aluminum alloy in the alkaline etching solution at 50°C for 3 minutes, and then wash it with hot water and cold water in turn. The alkaline etching solution is prepared by dissolving sodium hydroxide and sodium sulfide in deionized water. The hydrogen in the alkaline etching solution is The concentration of sodium oxide is 60g / L, and the concentration of sodium sulfide is 5g / L;

[0054] Immediately immer...

Embodiment 3

[0058] The preparation method of anodic oxidation electrolyte is identical with embodiment 2;

[0059] The preparation method of 2024 aluminum alloy (Al-Cu-Mg series) anodized film, the steps are as follows:

[0060] Put the 2024 aluminum alloy in the alkaline etching solution at 50°C for 3 minutes, and then wash it with hot water and cold water in turn. The alkaline etching solution is prepared by dissolving sodium hydroxide and sodium sulfide in deionized water. The hydrogen in the alkaline etching solution is The concentration of sodium oxide is 60g / L, and the concentration of sodium sulfide is 5g / L;

[0061] Immediately immerse the 2024 aluminum alloy after the cold water washing treatment in a 30% volume concentration nitric acid solution for 30 seconds, and then perform water washing treatment;

[0062] Put the 2024 aluminum alloy after the light treatment in the prepared 0.2mol / L phytic acid electrolyte, and carry out anodic oxidation treatment with direct current at 3...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to the metal surface treatment technology field, in particular to a high strength aluminum alloy anodizing electrolyte, a preparation method of a high strength aluminum alloy anode oxide film and a high strength aluminum alloy workpiece. The high strength aluminum alloy anodizing electrolyte contains 0.1-0.2mol / L of phytic acid. Oxidation reaction can occur on the surface ofa high strength aluminum alloy after being electrified in a phytic acid solution, and the anode oxide film 3-5[mu]m in thickness can be obtained by regulating the concentration of the phytic acid andoxidation voltage, and then corrosion resistance of the high strength aluminum alloy can be significantly improved on the premise that a film layer is thin and cannot influence fatigue performance ofa matrix, and furthermore the high strength aluminum alloy anodizing electrolyte is especially suitable for improving corrosion resistance of high strength aluminum alloys of Al-Cu, Al-Mg-Si and Al-Zn-Mg-Cu series; and additionally, the natural plant extract phytic acid is used, and therefore the high strength aluminum alloy anodizing electrolyte is economical and practical, environmentally friendly and free from toxicity, and simple and convenient in wastewater treatment process, and has good application value and good economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a high-strength aluminum alloy anodic oxidation electrolyte, a method for preparing a high-strength aluminum alloy anodic oxidation film, and a high-strength aluminum alloy workpiece. Background technique [0002] Al-Cu(2×××) series and Al-Zn-Mg-Cu(7×××) series aluminum alloys have the characteristics of low density, high specific strength and hardness, and excellent plastic processing performance. Therefore, they are widely used In aviation, construction and transportation and other fields. However, 2××× and 7××× aluminum alloys are very sensitive in corrosive medium environments, and are easily affected by various corrosions (such as pitting corrosion, exfoliation, intergranular corrosion, and stress corrosion, etc.), affecting aluminum alloy workpieces. performance and lifespan. Therefore, proper surface treatment must be used to improve the protective perfor...

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): C25D11/10
CPCC25D11/10
Inventor 王帅星何坚尹小乐杜楠王锦文
Owner NANCHANG HANGKONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap