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Constant current anode oxidation treatment method for surfaces of aluminum and aluminum alloy materials

An aluminum alloy material and anodizing technology, which is applied to the surface of aluminum and aluminum alloy materials under constant current conditions, anodizing treatment, and the field of surface treatment of aluminum and aluminum alloy materials. problem, to achieve the effect of small loss, excellent decoration and high hardness

Active Publication Date: 2009-06-03
ZHEJIANG SUPOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method forms an anodic oxide film with good wear resistance and high hardness on the surface of aluminum and aluminum alloy materials; however, since this method is operated at a constant voltage, the peak current density must reach 5-30A / dm 3 , so the requirements for the instrument are very high, this method is only suitable for simple experimental research in the laboratory, not suitable for large-scale industrial production

Method used

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  • Constant current anode oxidation treatment method for surfaces of aluminum and aluminum alloy materials
  • Constant current anode oxidation treatment method for surfaces of aluminum and aluminum alloy materials
  • Constant current anode oxidation treatment method for surfaces of aluminum and aluminum alloy materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1: Pretreatment of raw materials

[0026] Choose ordinary aluminum pots as raw materials, and then pre-treat the surface. The purpose of pre-treatment is to remove or modify the dirt and defects on the surface of aluminum pots, such as dust, metal oxides, residual oil, and asphalt marks. , Finger prints, welding flux and corrosive salts, metal burrs, slight scratches, etc. Therefore, before the oxidation treatment, chemical and physical methods are used to clean the surface of the product necessary to expose the pure metal substrate, so as to facilitate the smooth progress of anodic oxidation and coloring.

[0027] The main process of pre-processing is as follows:

[0028] (1) Degreasing: Degrease the above-mentioned common aluminum pot with NaOH solution with a concentration of 50-200g / L at a temperature of 40-80°C for 0.5-3min, wash with water after degreasing, and use 100-500g / L NaOH solution after washing. L nitric acid solution to neutralize and remove ash, degre...

Embodiment 2

[0037] The raw materials and their pretreatment process are the same as those in Example 1, and will not be repeated here.

[0038] Two: Determination of the composition of the composite electrolyte:

[0039] According to the requirements for gray-white oxide film layer on aluminum cookware.

[0040] Boric acid: 20g / L, sodium hypophosphite 10g / L, sulfosalicylic acid 6g / L.

[0041] When preparing a composite electrolyte, first dissolve all the above components with deionized water to make a concentrated solution, and then prepare a composite hydrolyzate in an oxidation tank as needed. Since the composite hydrolyzate will volatilize due to heating up during the anodic oxidation process, To be replenished in time.

[0042] Three: constant current anodizing treatment on the surface of aluminum pots and utensils:

[0043] An aluminum pan is used as an anode and placed in the composite electrolyte solution, wherein the temperature of the composite electrolyte solution is controll...

Embodiment 3

[0045] The raw materials and their pretreatment process are the same as those in Example 1, and will not be repeated here.

[0046] Two: Determination of the composition of the composite electrolyte:

[0047] According to the requirements for gray-white oxide film layer on aluminum cookware.

[0048] Boric acid: 40g / L, sodium hypophosphite 8g / L, sulfosalicylic acid 5g / L.

[0049] When preparing a composite electrolyte, first dissolve all the above components with deionized water to make a concentrated solution, and then prepare a composite hydrolyzate in an oxidation tank as needed. Since the composite hydrolyzate will volatilize due to heating up during the anodic oxidation process, To be replenished in time.

[0050] Three: constant current anodizing treatment on the surface of aluminum pots and utensils:

[0051] An aluminum pan is used as an anode and placed in the composite electrolyte solution, wherein the temperature of the composite electrolyte solution is controlle...

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Abstract

The invention discloses a constant current anode oxidation treatment method for surfaces of an aluminum and aluminum alloy material. The method comprises the following steps: the aluminum and the aluminum alloy material are taken as anodes and placed into a composite electrolyte; current density is controlled to rise from 0A / dm<3> to 1-5A / dm<3> that is the required current density within 20-120s and kept constant; anode oxidation voltage increases along with the increase of the current in 20-120s; the voltage slowly increases after reaching 20-60V, and reaches 70-120V in 600-1200s until a film is formed completely. The method is suitable for large-scale industrial production and has the advantages of low apparatus and equipment investment, low requirement, no need of special temperature control in the whole process flow, higher hardness of the produced anode oxide film, and better wear resistance, corrosion resistance, high temperature impact resistance and electrical insulation properties.

Description

technical field [0001] The invention relates to a method for surface treatment of aluminum and aluminum alloy materials, in particular to a method for anodic oxidation treatment of the surface of aluminum and aluminum alloy materials under constant current conditions; it belongs to the technical field of surface treatment of metal materials. Background technique [0002] Aluminum and aluminum alloy materials are widely used in various fields of the national economy due to their excellent physical, chemical, mechanical properties, light specific gravity, and easy processing. However, the surface of aluminum metal is easily corroded and worn by the environment. No matter what method is used to process aluminum materials and products, there will be dirt and defects on the surface to varying degrees, such as dust, residual oil, asphalt marks, manual handling fingerprints (mainly The ingredients are fatty acids and nitrogen-containing compounds), welding fluxes and corrosion salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 徐存荣旷亚非诸葛毅
Owner ZHEJIANG SUPOR CO LTD
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