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Porcelain oxidation method of aluminum piece

A technology for porcelain oxidation and aluminum parts, which is applied in the field of porcelain oxidation of aluminum parts, can solve the problems of unstable process, too much influence, and high price, and achieve good bonding force, high hardness and wear resistance, and electric resistance. Good insulation and corrosion resistance

Inactive Publication Date: 2012-01-11
WUJIANG SHI FINE WORKMANSHIP & ALUMINUM WORD MANUFACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, the following two methods are generally used: 1. The process of adding oxalic acid to titanium, cobalt, and thorium series is more expensive and unstable; 2. The mixed solution based on chromic acid is cheap, but the hardness of the film is relatively high. Low, too much impact on people and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After the aluminum material is mechanically polished, chemically degreased and corroded, cleaned, neutralized, cleaned, chemically oxidized, cleaned, scalded with hot water (50°C), dried with compressed air, and dried, porcelain can be formed on the surface of the aluminum material. plasma membrane.

[0016] The composition of the oxidation solution in the chemical oxidation step is as follows: chromic anhydride 10g / L, oxalic acid 15g / L, citric acid 5 g / L, nickel sulfate 10g / L;

[0017] The process parameters of the chemical oxidation step are as follows: current intensity 1A / dm 2 , Temperature: 15°C, time: 60min, voltage: 45v.

[0018] The obtained film is silver-gray, with a film thickness of 30 microns. The film layer has good bonding force, high hardness and wear resistance, good heat insulation, electrical insulation and corrosion resistance, and can meet various technical indicators of hard oxidation.

Embodiment 2

[0020] After the aluminum material is mechanically polished, chemically degreased and corroded, cleaned, neutralized, cleaned, chemically oxidized, cleaned, scalded with hot water (50°C), dried with compressed air, and dried, porcelain can be formed on the surface of the aluminum material. plasma membrane.

[0021] The composition of the oxidation solution in the chemical oxidation step is as follows: chromic anhydride 5g / L, oxalic acid 10g / L, citric acid 3 g / L, nickel sulfate 8g / L;

[0022] The process parameters of the chemical oxidation step are as follows: current intensity 0.5A / dm 2 , Temperature: 18°C, time: 55min, voltage: 40v.

[0023] The obtained film is silver-gray, with a film thickness of 25 microns. The film layer has good bonding force, high hardness and wear resistance, good heat insulation, electrical insulation and corrosion resistance, and can meet various technical indicators of hard oxidation.

Embodiment 3

[0025] After the aluminum material is mechanically polished, chemically degreased and corroded, cleaned, neutralized, cleaned, chemically oxidized, cleaned, scalded with hot water (50°C), dried with compressed air, and dried, porcelain can be formed on the surface of the aluminum material. plasma membrane.

[0026] The composition of the oxidation solution in the chemical oxidation step is as follows: chromic anhydride 1g / L, oxalic acid 12g / L, citric acid 1 g / L, nickel sulfate 5g / L;

[0027] The process parameters of the chemical oxidation step are as follows: current intensity 0.8A / dm 2 , Temperature: 20°C, time: 50min, voltage: 25v.

[0028] The obtained film is silver-gray, with a film thickness of 20 microns. The film layer has good bonding force, high hardness and wear resistance, good heat insulation, electrical insulation and corrosion resistance, and can meet various technical indicators of hard oxidation.

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Abstract

The invention relates to a porcelain oxidation method of an aluminum piece. A porcelain membrane is formed on the surface of an aluminum material after the aluminum material is subjected to the processes of mechanical polishing, chemical oil removal and corrosion, cleaning, neutralization, cleaning, chemical oxidation, cleaning, scalding by hot water at a temperature of 50 DEG C, blow-drying by compressed air, and drying by an oven. An oxidizing solution adopted in the processes of chemical oxidation comprises 1 to 10g / L of chromic anhydride, 10 to 15g / L of oxalic acid, 1 to 5g / L of citric acid and 5 to 10g / L of nickel sulfate. Technological parameters of the processes of chemical oxidation comprise current strength of 0.5 to 1A / dm2, a temperature of 15 to 20 DEG C, time of 50 to 60 minutes and voltage of 25 to 45V. The porcelain oxidation method is suitable for general aluminum materials. A membrane obtained by the porcelain oxidation method has a color of silver gray, film thickness of 20 to 30 micrometers, a bonding capacity, high hardness and wear resistance, and good properties of heat insulation, electrical insulation and corrosion resistance, and thus can reach all technical indexes of hardening oxidation.

Description

technical field [0001] The invention relates to a porcelain oxidation method for aluminum parts, which belongs to the field of surface treatment of aluminum materials. Background technique [0002] In the atmosphere, the surface of aluminum and aluminum alloy reacts with oxygen to form an oxide film. The oxide film is amorphous, uneven, and discontinuous, and cannot be used as a reliable protective and decorative film. In order to improve the surface hardness and durability of aluminum alloy Abrasion and corrosion resistance, usually anodic oxidation method is used to form a passivation layer of aluminum oxide on the surface of aluminum and aluminum alloys. Porcelain anodic oxidation is to use aluminum alloy to generate anodic oxidation film in electrolyte, and at the same time, some gray substances It is adsorbed in the growing oxide film, so as to obtain a uniform, smooth and shiny oxide film with a thickness of about 6-20 microns. Traditionally, the following two me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10
Inventor 谢利荣
Owner WUJIANG SHI FINE WORKMANSHIP & ALUMINUM WORD MANUFACTORY
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