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

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...

Examples

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...

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...

Examples

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...

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