A method for removing the inner shielding layer of anodized aluminum channel

Abstract

The invention provides a method for removing a shielding layer in an anodized aluminum pore channel. Through selective adsorption reaction of gamma-chloropropyl trimethylsilane with a porous layer andthe shielding layer and subsequent alkaline corrosion reaction which can effectively corrode the shielding layer located at the bottom of the anodized film pore channel, the electrical conductivity of an anodized substrate is effectively improved.

Description

technical field

[0001] The invention relates to a method for fixed-point corrosion of the shielding at the bottom of an anodic oxidation channel by a chemical acid agent, which belongs to the field of electrochemically preparing anodic oxidation film aluminum materials without shielding layers, and is especially suitable for the application of improving the bonding force between aluminum materials and electroplated metals.

[0002] technical background

[0003] Aluminum or aluminum alloy anodizing refers to the process of immersing aluminum or aluminum alloy in a suitable electrolyte as an anode for electrification, and forming an oxide film (Al2O layer) on the surface of aluminum or aluminum alloy. The existence of this layer of oxide film can improve the corrosion resistance of aluminum alloy. At the same time, with the help of the special structure of the oxide film and the later treatment process, for example, the anodic oxide film can also be combined with surface paintin...

Examples

Embodiment 1

[0090] First, the preparation method of γ-chloropropyltrichlorosilane used in Example 1-3 is as follows: Take a 1000mL three-necked flask, mix 4.5M trichlorosilane and 3M 3-chloropropene in a constant pressure dropping funnel, Put about 25mL of feed liquid into reaction bottle earlier, then add 0.1mol / L chloroplatinic acid-isopropanol solution 0.15mL, cocatalyst 0.15mL, hydroquinone 0.25g, reaction is triggered rapidly at room temperature, is heated up to Start dropping the feed solution at 75°C, adjust the dropping rate and control the temperature at 80°C, complete the dropwise addition in about 2 hours, then reflux for 3 hours, and end the reaction when the reaction temperature finally rises to 90°C. The reaction mixture was fractionated under normal pressure, and the fraction at 182°C was collected, which was 3-chloropropyltrichlorosilane.

[0091] Secondly, the used pretreatment solution of embodiment 1-3 is consistent, all comprises mechanical polishing-degreasing-hot wat...

Embodiment 2

[0100] (2) Anodizing: use the aluminum material treated in step (1) as the anode, graphite as the cathode, immerse in the electrolyte, and connect the power supply through wires respectively. The electrolyte is a mixture of oxalic acid, phosphoric acid and sulfosalicylic acid , the concentration of oxalic acid is 0.275M, the concentration of phosphoric acid is 0.3M, the concentration of sulfosalicylic acid is 0.1M, the electrolysis parameters are as follows, the voltage is 25V, the temperature is 30 o C, current density 2.5A / dm 2 , time 25min; after anodizing, soak and clean in ethanol, and use vacuum drying to remove the electrolyte in the oxide film. The whole process strictly avoids the aluminum after anodizing from contacting air or water to avoid sealing holes.

[0101] (3) Protective film for positioning marks: Soak the aluminum material treated in step (2) in a toluene solution of γ-chloropropyltrimethylsilane, the concentration is 15wt.%, and the amount is 1% of the we...

Embodiment 3

[0104] (2) Anodizing: use the aluminum material treated in step (1) as the anode, graphite as the cathode, immerse in the electrolyte, and connect the power supply through wires respectively. The electrolyte is a mixture of oxalic acid, phosphoric acid and sulfosalicylic acid , the concentration of oxalic acid is 0.275M, the concentration of phosphoric acid is 0.3M, the concentration of sulfosalicylic acid is 0.1M, the electrolysis parameters are as follows, the voltage is 25V, the temperature is 30 o C, current density 2.5A / dm 2 , time 25min; after anodizing, soak and clean in ethanol, and use vacuum drying to remove the electrolyte in the oxide film. The whole process strictly avoids the aluminum after anodizing from contacting air or water to avoid sealing holes.

[0105] (3) Protective film for positioning marks: Soak the aluminum material treated in step (2) in a toluene solution of γ-chloropropyltrimethylsilane, the concentration is 15wt.%, and the amount is 1% of the we...

technical field

[0001] The invention relates to a method for fixed-point corrosion of the shielding at the bottom of an anodic oxidation channel by a chemical acid agent, which belongs to the field of electrochemically preparing anodic oxidation film aluminum materials without shielding layers, and is especially suitable for the application of improving the bonding force between aluminum materials and electroplated metals.

[0002] technical background

[0003] Aluminum or aluminum alloy anodizing refers to the process of immersing aluminum or aluminum alloy in a suitable electrolyte as an anode for electrification, and forming an oxide film (Al2O layer) on the surface of aluminum or aluminum alloy. The existence of this layer of oxide film can improve the corrosion resistance of aluminum alloy. At the same time, with the help of the special structure of the oxide film and the later treatment process, for example, the anodic oxide film can also be combined with surface paintin...

Examples

Embodiment 1

[0090] First, the preparation method of γ-chloropropyltrichlorosilane used in Example 1-3 is as follows: Take a 1000mL three-necked flask, mix 4.5M trichlorosilane and 3M 3-chloropropene in a constant pressure dropping funnel, Put about 25mL of feed liquid into reaction bottle earlier, then add 0.1mol / L chloroplatinic acid-isopropanol solution 0.15mL, cocatalyst 0.15mL, hydroquinone 0.25g, reaction is triggered rapidly at room temperature, is heated up to Start dropping the feed solution at 75°C, adjust the dropping rate and control the temperature at 80°C, complete the dropwise addition in about 2 hours, then reflux for 3 hours, and end the reaction when the reaction temperature finally rises to 90°C. The reaction mixture was fractionated under normal pressure, and the fraction at 182°C was collected, which was 3-chloropropyltrichlorosilane.

[0091] Secondly, the used pretreatment solution of embodiment 1-3 is consistent, all comprises mechanical polishing-degreasing-hot wat...

Embodiment 2

[0100] (2) Anodizing: use the aluminum material treated in step (1) as the anode, graphite as the cathode, immerse in the electrolyte, and connect the power supply through wires respectively. The electrolyte is a mixture of oxalic acid, phosphoric acid and sulfosalicylic acid , the concentration of oxalic acid is 0.275M, the concentration of phosphoric acid is 0.3M, the concentration of sulfosalicylic acid is 0.1M, the electrolysis parameters are as follows, the voltage is 25V, the temperature is 30 o C, current density 2.5A / dm 2 , time 25min; after anodizing, soak and clean in ethanol, and use vacuum drying to remove the electrolyte in the oxide film. The whole process strictly avoids the aluminum after anodizing from contacting air or water to avoid sealing holes.

[0101] (3) Protective film for positioning marks: Soak the aluminum material treated in step (2) in a toluene solution of γ-chloropropyltrimethylsilane, the concentration is 15wt.%, and the amount is 1% of the we...

Embodiment 3

[0104] (2) Anodizing: use the aluminum material treated in step (1) as the anode, graphite as the cathode, immerse in the electrolyte, and connect the power supply through wires respectively. The electrolyte is a mixture of oxalic acid, phosphoric acid and sulfosalicylic acid , the concentration of oxalic acid is 0.275M, the concentration of phosphoric acid is 0.3M, the concentration of sulfosalicylic acid is 0.1M, the electrolysis parameters are as follows, the voltage is 25V, the temperature is 30 o C, current density 2.5A / dm 2 , time 25min; after anodizing, soak and clean in ethanol, and use vacuum drying to remove the electrolyte in the oxide film. The whole process strictly avoids the aluminum after anodizing from contacting air or water to avoid sealing holes.

[0105] (3) Protective film for positioning marks: Soak the aluminum material treated in step (2) in a toluene solution of γ-chloropropyltrimethylsilane, the concentration is 15wt.%, and the amount is 1% of the we...

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