Method for preparing aluminum-copper alloy microarc oxidation film

Abstract

The invention relates to the field of aluminum-copper alloy surface treatment and aims to provide a method for preparing an aluminum-copper alloy microarc oxidation film, which solves the problem on the application of microarc oxidation in the production of aluminum-copper alloy. The preparation method is characterized in that a special electrolyte composite is adopted to prepare the microarc oxidation film, and the property of a generated film can be effectively changed by controlling the proportion among technological parameters, such as electrical parameters, electrolyte composite systems, processing time and the like. The preparation method has the advantages that the electrolyte composite has abundant sources, and is environmentally-friendly and easy for proportioning; and the technological process for preparing the film is simple and is easy to operate and control, and the prepared film has excellent corrosion resistance.

Description

Technical field:

[0001] The invention relates to the field of surface treatment of aluminum-copper alloys. Background technique:

[0002] Aluminum-copper alloy has high mechanical strength, good plasticity and weldability in annealed state, and good heat treatment effect, and is widely used in aerospace, machinery manufacturing and other fields. However, aluminum-copper alloys have poor corrosion resistance and are prone to localized corrosion, intergranular corrosion and stress corrosion fatigue. Surface treatment of aluminum-copper alloy is an effective method to improve its corrosion resistance. At present, anodic oxidation is mainly used, and anodic oxidation of aluminum-copper alloy has always been a difficult problem in surface treatment. When the copper content reaches 4%, the CuAl 2 The phase dissolves quickly and often becomes the center of current gathering, which easily causes the film layer in this part to be overheated and dissolved, resulting in more defects ...

Examples

Embodiment 1

[0017] In this example, the test material is cast aluminum-copper alloy ZL201, according to the process flow figure 1 Prepare the micro-arc oxidation film layer, the composition of the electrolyte composition, process parameters and film layer properties are shown in Table 1:

[0018] Table 1. The composition of the electrolyte composition, process parameters and film layer performance comprehensive table

[0019]

[0020] Note: 1. The power supply voltage used in Table 1 is 550V~700V.

[0021] 2. The test temperature is not higher than 35 ℃.

[0022] 3. The corrosion resistance of the film layer is tested according to the experimental standards required by the national standard GB / T 10125-1997 (eqv ISO 9227: 1990) of the People's Republic of China. Continuous spray is used, and the salt spray test period is 96 hours. The grade after assessment implemented by the national standard GB6461-86 of the People's Republic of China.

[0023] 4. The hardness is measured by a Vick...

Embodiment 2

[0025] In this embodiment, the test material is the deformed aluminum-copper alloy 2A14, according to the process flow figure 1 Prepare the micro-arc oxidation film layer, the composition, process parameters and film layer performance of the electrolyte composition are shown in Table 2:

[0026] Table 2. The composition of the electrolyte composition, process parameters and film layer performance comprehensive table

[0027]

[0028] Note: 1. The power supply voltage used in Table 2 is 550V~700V.

[0029] 2. The test temperature is not higher than 35 ℃.

[0030] 3. The corrosion resistance of the film layer is tested according to the experimental standards required by the national standard GB / T 10125-1997 (eqv ISO 9227: 1990) of the People's Republic of China. Continuous spray is used, and the salt spray test period is 96 hours. The grade after assessment implemented by the national standard GB6461-86 of the People's Republic of China.

[0031] 4. The hardness is measure...

Technical field:

[0001] The invention relates to the field of surface treatment of aluminum-copper alloys. Background technique:

[0002] Aluminum-copper alloy has high mechanical strength, good plasticity and weldability in annealed state, and good heat treatment effect, and is widely used in aerospace, machinery manufacturing and other fields. However, aluminum-copper alloys have poor corrosion resistance and are prone to localized corrosion, intergranular corrosion and stress corrosion fatigue. Surface treatment of aluminum-copper alloy is an effective method to improve its corrosion resistance. At present, anodic oxidation is mainly used, and anodic oxidation of aluminum-copper alloy has always been a difficult problem in surface treatment. When the copper content reaches 4%, the CuAl 2 The phase dissolves quickly and often becomes the center of current gathering, which easily causes the film layer in this part to be overheated and dissolved, resulting in more defects ...

Examples

Embodiment 1

[0017] In this example, the test material is cast aluminum-copper alloy ZL201, according to the process flow figure 1 Prepare the micro-arc oxidation film layer, the composition of the electrolyte composition, process parameters and film layer properties are shown in Table 1:

[0018] Table 1. The composition of the electrolyte composition, process parameters and film layer performance comprehensive table

[0019]

[0020] Note: 1. The power supply voltage used in Table 1 is 550V~700V.

[0021] 2. The test temperature is not higher than 35 ℃.

[0022] 3. The corrosion resistance of the film layer is tested according to the experimental standards required by the national standard GB / T 10125-1997 (eqv ISO 9227: 1990) of the People's Republic of China. Continuous spray is used, and the salt spray test period is 96 hours. The grade after assessment implemented by the national standard GB6461-86 of the People's Republic of China.

[0023] 4. The hardness is measured by a Vick...

Embodiment 2

[0025] In this embodiment, the test material is the deformed aluminum-copper alloy 2A14, according to the process flow figure 1 Prepare the micro-arc oxidation film layer, the composition, process parameters and film layer performance of the electrolyte composition are shown in Table 2:

[0026] Table 2. The composition of the electrolyte composition, process parameters and film layer performance comprehensive table

[0027]

[0028] Note: 1. The power supply voltage used in Table 2 is 550V~700V.

[0029] 2. The test temperature is not higher than 35 ℃.

[0030] 3. The corrosion resistance of the film layer is tested according to the experimental standards required by the national standard GB / T 10125-1997 (eqv ISO 9227: 1990) of the People's Republic of China. Continuous spray is used, and the salt spray test period is 96 hours. The grade after assessment implemented by the national standard GB6461-86 of the People's Republic of China.

[0031] 4. The hardness is measure...

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