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Preparation method of high bonding force coating taking anodic alumina as base material

An anodized aluminum, anodic oxidation technology, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of unfavorable electroplating process, undisclosed etching method, non-uniform corrosion, etc., and achieve simple and easy positioning corrosion, Good wash-off and high solubility

Active Publication Date: 2020-05-05
李玉龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0051] For details, see the attached figure 1 It is stated in the relevant content of the specification that “in some cases, the oxide structure 18 can be etched to remove its part (including the barrier layer) at the bottom of the nanopore 16, thereby exposing the underlying aluminum substrate 12”, that is, the The prior art directly abandons the treatment of the shielding layer 19, or directly etches it away vaguely, and does not disclose a specific etching method at all.
[0052] In addition, methods for removing the shielding layer are also described in the prior art, including the use of oxalic acid or phosphoric acid, or other mixtures, but there are obvious technical problems as follows: (1) The porous oxide layer cannot be limitedly distinguished by acid corrosion And the shielding layer, that is, the acid solution corrodes the anodic oxide film indiscriminately, which seriously affects the array structure of the anodic oxide film channel, resulting in the collapse of the anodic oxide film array structure or non-uniform corrosion, which is not conducive to the subsequent electroplating process and seriously reduces the electroplating of the coating. Uniformity and stability of bonding force; (2) During the corrosion process, when the shielding layer is penetrated, the corrosion solution will obviously corrode the aluminum material, causing damage to the base material

Method used

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  • Preparation method of high bonding force coating taking anodic alumina as base material
  • Preparation method of high bonding force coating taking anodic alumina as base material
  • Preparation method of high bonding force coating taking anodic alumina as base material

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Experimental program
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Embodiment 1

[0112] The pretreatment step used in embodiment 1-3 is consistent with the solution, all including mechanical polishing-degreasing-hot water washing-alkali washing-hot water washing-cold water washing-acid washing-water washing:

[0113] The mechanical polishing is sandblasting,

[0114] Described degreasing is alkaline degreasing, and degreasing liquid is the mixed aqueous solution of 23g / L sodium carbonate and 2.5g / L sodium phosphate, temperature 67 o C, soaking time 5.5min;

[0115] Described alkali washing liquid is the sodium citrate aqueous solution of 25g / LNaOH, 4g / L, and temperature is 15 o C, soaking time 17.5min;

[0116] The pickling and deashing solution is 60g / L HNO 3 and a mixed aqueous solution of 6g / LNaF at room temperature for 2.5 minutes.

[0117] (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 mixtu...

Embodiment 2

[0125] (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.

[0126] (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

[0133] (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.

[0134] (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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Abstract

The invention provides a preparation method of a high bonding force coating taking anodic alumina as the base material. A shielding layer at the bottom of an anode oxide film is removed to expose thealuminum metal base material, and then, electroplating monometallic treatment is carried out, and finally, combination of the anodic oxidation base material and the coating is effectively improved.

Description

technical field [0001] The invention relates to a method for preparing a high-binding force coating using anodized aluminum as a base material, which belongs to the field of electrochemically preparing anodized aluminum materials without shielding layers, and is especially suitable for improving the bonding force between aluminum materials and electroplated metals. [0002] technical background [0003] With the rapid development of science and technology and industry, people have more and more stringent requirements on metal properties. Lightweight and high-hardness metal alloy materials are widely used in related fields. Since the output of aluminum in the world is second only to iron, light metal aluminum alloys The material gets a lot of attention. Aluminum and aluminum alloy materials have low hardness, poor wear resistance, and are prone to intergranular corrosion, and a thin oxide film is easy to form on the surface of aluminum under natural conditions, and the film is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12C25D5/18C25D5/44C25D11/10C25D11/16C23G1/22C23G1/12C25D5/20
CPCC23G1/125C23G1/22C25D3/12C25D5/18C25D5/20C25D5/44C25D11/10C25D11/16
Inventor 王永芝
Owner 李玉龙
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