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Complex acid and oxalic acid anodization method for processing aluminum and aluminum alloy

A technology of oxalochromate anode and aluminum alloy, which is applied in the direction of chromate treatment, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of corrosion resistance, insulation, and unsatisfactory appearance, and achieve consistent appearance color, The film layer has good insulation and good degreasing effect

Active Publication Date: 2009-07-08
GUIZHOU HONGLIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the expansion of subcontracted production of international cooperative aviation and non-aviation products, the traditional chromic acid anodizing method used for anodizing the surface of aluminum and aluminum alloys cannot meet the requirements of current aviation products in terms of corrosion resistance, insulation and appearance. Therefore, a new method is needed to improve its corrosion resistance, insulation and appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] An oxalochromic acid anodizing method for processing aluminum and aluminum alloys, comprising the steps of:

[0016] (1) Degreasing:

[0017] a) Preparation of degreasing tank solution: prepare tank solution with tap water, add 350L tap water into the tank, heat to about 55°C, add 11.5kg of Na in a stirring state 3 PO 4 , to fully dissolve; then add 0.25kg of Na 2 CO 3 , 1.25kg of triethanolamine, after being fully dissolved, add 500mL of C 17 h 33 COOH.N(CH 2 CH 2 Oh) 3 , and stir to make it fully dissolve, add tap water to 500L, adjust the pH value of the bath to 9.5, if the pH value is higher than 9.5, adjust with boric acid, if the pH value is lower than 9, adjust with borax;

[0018] b) After the parts are put into the tank, turn on the ultrasonic wave to degrease, adjust to the required current of 3A, control the degreasing temperature at 55-65°C, and keep it for 15-25 minutes;

[0019] (2) hot water washing;

[0020] (3) Wash in cold water:

[0021] (4...

Embodiment 2

[0033] An oxalochromic acid anodizing method for processing aluminum and aluminum alloys, comprising the steps of:

[0034] (1) Degreasing:

[0035] a) Preparation of degreasing tank solution: prepare tank solution with tap water, add tap water to the tank according to the total volume of the tank solution of 375L, heat to about 55°C and add 10kg of Na in a stirring state 3 PO 4 , to fully dissolve; then add 0.25kg of Na 2 CO 3 , 1.25kg of triethanolamine, after being fully dissolved, add 500mL of C 17 h 33 COOH.N(CH 2 CH 2 Oh) 3 , and stir to make it fully dissolved, add tap water to 500L, and adjust the pH value of the bath to 9;

[0036] b) After the parts are put into the tank, turn on the ultrasonic wave to degrease, adjust to the required current of 5A, control the degreasing temperature at 55-65°C, and keep it for 15-25 minutes;

[0037] (2) hot water washing;

[0038] (3) Wash in cold water:

[0039] (4) Corrosion: Prepare the tank solution with pure water, th...

Embodiment 3

[0051] An oxalochromic acid anodizing method for processing aluminum and aluminum alloys, comprising the steps of:

[0052] (1) Degreasing:

[0053] a) Preparation of degreasing tank solution: Prepare tank solution with tap water, add 360L tap water into the tank, heat to about 55°C and add 11kg of Na in a stirring state 3 PO 4 , to fully dissolve; then add 1kg of Na 2 CO 3 , 1.5kg of triethanolamine, after being fully dissolved, add 150mL of C 17 h 33 COOH.N(CH 2 CH 2 Oh) 3 , and stir to make it fully dissolve, add tap water to 500L, adjust the pH value of the bath to 9.5, if the pH value is higher than 9.5, adjust with boric acid, if the pH value is lower than 9, adjust with borax;

[0054] b) After the parts are put into the tank, turn on the ultrasonic wave to degrease, adjust to the required current of 4A, control the degreasing temperature at 55-65°C, and keep it for 15-25 minutes;

[0055] (2) hot water washing;

[0056] (3) Wash in cold water:

[0057] (4) C...

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Abstract

The invention discloses an oxalic chromic acid anodizing method for processing aluminium and aluminium alloy which includes steps: removing oil, washing with hot water, washing with cool water, corrupting, countercurrent rinsing, washing with cool water, anode oxidating, countercurrent rinsing, closing and drying. The method has characteristics of confecting tank liquor in anode oxidating working procedure, confecting tank liquor in removing oil working procedure, confecting tank liquor in corrupting working procedure and confecting tank liquor in closing working procedure. The aluminium and the aluminium alloy treated by the method has characteristics of micromesh film crystal, stronger corrosion resistance, better insulating property and decoration.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an anodic oxidation method. Background technique [0002] Anodize the surface of aluminum and aluminum alloy to form a protective film layer, so that it has better corrosion resistance and insulation. With the expansion of subcontracted production of international cooperative aviation and non-aviation products, the traditional chromic acid anodizing method used for anodizing the surface of aluminum and aluminum alloys cannot meet the requirements of current aviation products in terms of corrosion resistance, insulation and appearance. Therefore, a new method is needed to improve its corrosion resistance, insulation and appearance. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned shortcomings and provide a kind of oxalochromic acid anodization method for processing aluminum and aluminum alloy with fine film crys...

Claims

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Application Information

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IPC IPC(8): C25D11/10C25D11/38
Inventor 贾亚洲李宏唐华杨旭江
Owner GUIZHOU HONGLIN MACHINERY
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