Preparation method of anodic oxide film

[0060] This embodiment provides a method for preparing an anodic oxide film, and the flow chart of the preparation method is as follows: figure 1 As shown, the preparation method comprises the following steps:

[0061] (1) Degreasing treatment: The aluminum alloy casting is immersed in 200g / L of degreasing agent, and soaked for 5 minutes at 60°C. The degreasing agent is composed of 25% sulfuric acid, 1% sodium alkyl sulfonate, and the balance is water;

[0062] (2) The first water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 4 minutes;

[0063] (3) Alkaline etching treatment: Immerse the aluminum alloy casting into 40g / L sodium hydroxide solution, and soak it at 50°C for 2min;

[0064] (4) The second water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 4 minutes;

[0065] (5) Neutralization treatment: immerse the aluminum alloy casting into 200g / L nitric acid solution for 15min;

[0066] (6)...

[0072] This embodiment provides a preparation method of an anodic oxide film, and the preparation method includes the following steps:

[0073] (1) Degreasing treatment: Immerse the aluminum alloy castings in 180g / L degreasing agent, soaked at 55°C for 10 min. The degreasing agent is composed of 20% sulfuric acid, 1% fatty alcohol polyoxyethylene ether, 1% alkylsulfonic acid Sodium and the balance are composed of water;

[0074] (2) The first water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 3 minutes;

[0075] (3) Alkaline etching treatment: Immerse the aluminum alloy casting into 30g / L sodium hydroxide solution, and soak it at 45°C for 3min;

[0076] (4) The second water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 3 minutes;

[0077] (5) Neutralization treatment: Immerse the aluminum alloy casting into 190g / L nitric acid solution for 20min;

[0078] (6) The third water washing treatmen...

[0084] This embodiment provides a preparation method of an anodic oxide film, and the preparation method includes the following steps:

[0085] (1) Degreasing treatment: Immerse the aluminum alloy castings in 220g / L degreasing agent, soaked at 65°C for 10min. The degreasing agent is composed of 30% sulfuric acid, 1.5% fatty alcohol polyoxyethylene ether, 0.3% alkylsulfonic acid Sodium and the balance are composed of water;

[0086] (2) The first water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 5 minutes;

[0087] (3) Alkaline etching treatment: Immerse the aluminum alloy casting into 50g / L sodium hydroxide solution, and soak it at 55°C for 1min;

[0088] (4) The second water washing treatment: repeatedly rinse the aluminum alloy casting with deionized water for 3 minutes;

[0089] (5) Neutralization treatment: Immerse the aluminum alloy casting into 210g / L nitric acid solution for 10min;

[0090] (6) The third water washing treat...