Method for improving alkaline resistance of anode oxide film on surface of aluminum or aluminum alloy material

An aluminum alloy material, anodized film technology, applied in anodizing, surface reaction electrolytic coating, electrolytic coating and other directions, can solve the problems of complex anti-corrosion performance treatment steps, poor corrosion resistance and other problems, achieve simple operation, The effect of improving alkali resistance and improving alkali resistance

Inactive Publication Date: 2014-12-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of poor corrosion resistance and complex anti-corrosion performance treatment steps of the oxide film on the surface of aluminum materials in the prior art, the purpose of the present invention is to provide a simple operation, economical and environmental protection, which can effectively improve the performance of aluminum or aluminum alloys. Method for Alkali Resistance of Anodized Film on Material Surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pretreatment: mechanical pretreatment adopts sandblasting or sandpaper grinding, mainly to remove burrs, oxides, reduce surface roughness, and wash with water; then use CH 3 COOH 300mL, H 3 PO 4 540mL, HNO 3 100mL of acidic chemical polishing solution is used for chemical polishing at a temperature of 55-60°C and a time of 60-120s. After the aluminum sample is polished, it is rinsed with water, then ultrasonicated in ethanol for 10 minutes, and then rinsed repeatedly with deionized water.

[0032] Anodizing: Take three pretreated aluminum samples and carry out anodizing treatment respectively. The electrolyte composition is: oxalic acid 40g / L, tartaric acid 5g / L, malic acid 5g / L, sulfuric acid 5mL / L, sodium tungstate 0.5g / L, and the current density is 1.0A / dm 2 , the oxidation time is 20min, low-temperature cooling cycle (0-10°C); the electrolyte temperature is controlled at 10-25°C, and the tank pressure can be maintained at about 44V during the treatment process to...

Embodiment 2

[0038] Pretreatment: Mechanical pretreatment adopts sandblasting or sandpaper grinding, mainly to remove burrs and oxides, reduce surface roughness, and wash with water. Chemical polishing using CH 3 COOH 300mL, H3 PO 4 540mL, HNO 3 The chemical polishing solution composed of 100mL is used to polish the mechanically pretreated samples at a temperature of 55-60°C for 60-120s and wash with water.

[0039] Anodizing: Take three pre-treated aluminum samples and carry out anodizing treatment respectively. The electrolyte composition is: oxalic acid 10g / L, tartaric acid 15g / L, boric acid 40g / L, sulfuric acid 8mL / L, sodium hypophosphite 3g / L, and the current density is 2.0A / dm 2 , the oxidation time is 25min, low-temperature cooling cycle (0-10°C); the electrolyte temperature is controlled at 10-25°C, and the tank pressure can be maintained at about 40V during the treatment process to obtain a prefabricated anodic oxide film.

[0040] Sealing treatment: First, immerse the above-m...

Embodiment 3

[0044] Pretreatment: Mechanical pretreatment adopts sandblasting or sandpaper grinding, mainly to remove burrs and oxides, reduce surface roughness, and wash with water. Chemical polishing using CH 3 COOH 300mL, H 3 PO 4 540mL, HNO 3 The chemical polishing solution composed of 100mL is used to polish the mechanically pretreated samples at a temperature of 55-60°C for 60-120s and wash with water.

[0045] Anodizing: Take three pre-treated aluminum samples and carry out anodizing treatment respectively. The electrolyte composition is oxalic acid 80g / L, malic acid 15g / L, citric acid 40g / L, phosphoric acid 20g / L, boric acid 60g / L, phosphorous acid 10g / L, cerium nitrate 2g / L, sodium metaaluminate 6g / L , the current density is 3.0A / dm 2 , the oxidation time is 20min, low-temperature cooling cycle (0-10°C); the electrolyte temperature is controlled at 10-25°C, the tank pressure can be maintained at about 37V during the treatment process, and a prefabricated anodic oxide film is ...

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Abstract

The invention discloses a method for improving the alkaline resistance of an anode oxide film on the surface of an aluminum or aluminum alloy material. The method comprises the following steps: performing polishing pretreatment on the aluminum or aluminum alloy material, performing anodic oxidation treatment in electrolytic liquid containing organic acid, inorganic acid and soluble oxysalt, performing closing treatment on an oxide film obtained after the anodic oxidation treatment, and forming a silane film layer on the surface of the aluminum or aluminum alloy material subjected to the closing treatment. The method for surface treatment of the aluminum or aluminum alloy material is easy to perform, economic, environment-friendly and capable of effectively improving the alkaline resistance of the anode oxide film on the surface of the aluminum or aluminum alloy material.

Description

technical field [0001] The invention relates to a method for improving the alkali resistance of an anodized film on the surface of aluminum or aluminum alloy materials, and belongs to the field of corrosion and protection of aluminum and its alloys. Background technique [0002] Aluminum alloy is a kind of non-ferrous metal structural material widely used in industry. It is often used in corrosive environments such as building materials, air conditioners, refrigerators, cookers, and vehicle bottoms. Since the pH value of the cleaning agent used in the process of car cleaning and cooking utensil cleaning is in the range of 10 to 13.5, this requires that the surface of aluminum parts has better alkali resistance. The anodic oxidation film of aluminum has the characteristics of compactness, corrosion resistance and wear resistance, so the hard anodic oxidation and sealing treatment of aluminum and its alloys are the main measures to enhance its corrosion resistance. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/18
Inventor 旷亚非张承平周海晖刘佳陈梁
Owner HUNAN UNIV
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