Local anodic oxidation method for surface of workpiece

A local anodizing and workpiece surface technology, applied in the field of electrochemical treatment, can solve problems affecting product appearance and performance, product scrapping, repeated positioning errors, etc., to avoid poor repeating positioning accuracy, reduce processing costs, and increase adhesion Effect

Inactive Publication Date: 2012-02-29
SHANGHAI REAL INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First: Due to the secondary machining, the oxide film on the surface of the product is easy to be damaged during clamping, which seriously affects the appearance and performance of the product, and even leads to the scrapping of the product;
[0005] Second: With secondary machining, there are errors in repeated positioning, and it is difficult for products with strict precision requirements to meet the requirements

Method used

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  • Local anodic oxidation method for surface of workpiece
  • Local anodic oxidation method for surface of workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment is to illustrate the application when the surface of the workpiece to be anodized that does not need to be oxidized is a plane.

[0028] ① Preparation of samples: figure 1 It is a hydraulic valve body used in the brake system of new energy vehicles. Due to some functional requirements of the valve body, the A side does not need anodizing;

[0029] ② Put the sample into the surface treatment solution (chromic acid: 20-30g / l, phosphoric acid: 20-25%, and the rest is water) for treatment at a temperature of 50-60°C and a treatment time of 20-30 seconds;

[0030] ③ Wash the surface treatment solution with water, and dry the surface of the sample;

[0031] ④ Adhesive tape: Paste the surface A of the sample treated in step ③ with polyimide tape. Use a hard rubber plate to squeeze and slide on the surface of the tape in one direction, stick the surface of the workpiece to the tape and drive away the air bubbles on the surface of the tape and the workpiece;

...

Embodiment 2

[0036] This embodiment is intended to illustrate the application when the surface of the workpiece to be anodized that does not need to be oxidized is a cylindrical surface.

[0037] ① Preparation of samples: figure 2 It is a battery piston used in the braking system of new energy vehicles. Due to the requirements of the piston for electrical conductivity, the D surface of the cylinder does not need anodic oxidation;

[0038] ② Put the sample into the surface treatment solution (chromic acid: 20-30g / l, phosphoric acid: 20-25%, and the rest is water) for treatment at a temperature of 50-60°C and a treatment time of 20-30 seconds;

[0039] ③ Wash the surface treatment solution with water, and dry the surface of the sample;

[0040] ④ Adhesive tape: Paste the surface D of the sample treated in step ③ with polyimide tape. Use a hard rubber plate to squeeze and slide on the surface of the tape in one direction, stick the surface of the workpiece to the tape and drive away the ai...

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PUM

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Abstract

The invention discloses a local anodic oxidation method for the surface of a workpiece. The method comprises the following steps of: putting the workpiece into a pretreatment solution, and treating the workpiece for 20 to 30 seconds; washing and drying the pretreated workpiece; firmly sticking a polyimide adhesive tape to the oxidation-free surface of the workpiece, and removing bubbles on the adhesive tape and the surface of the workpiece; performing anodic oxidation treatment according to the conventional oxidation flow; and tearing down the adhesive tape on the surface of the oxidized workpiece, and wiping the residual adhesive on the surface of the workpiece by using an organic solvent. The local anodic oxidation method has the advantages of reducing the machining frequency, reducing the machining cost of the workpiece and avoiding the defects of poor repeated positioning precision and low product qualification rate; and the oxidation-free surface of the workpiece is effectively shielded by the polyimide adhesive tape.

Description

technical field [0001] The invention relates to an electrochemical treatment method, in particular to a local anodic oxidation method on the surface of an aluminum alloy workpiece. Background technique [0002] In the process of anodizing, due to some functional requirements of the workpiece, some parts of the surface of a workpiece do not need anodic oxidation film. The existing treatment method is to use mechanical processing after the product is fully anodized, and then the oxidation will not be required. Surface oxide film removal. [0003] The defective of above-mentioned existing processing method is: [0004] First: Due to the secondary machining, the oxide film on the surface of the product is easy to be damaged during clamping, which seriously affects the appearance and performance of the product, and even leads to the scrapping of the product; [0005] Second: With secondary machining, there are errors in repeated positioning, and it is difficult for products wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02
Inventor 吴晓杉
Owner SHANGHAI REAL INDAL
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