Electrolyte, anodization method and anodized silicon-aluminum alloy

An anodic oxidation and electrolyte technology, applied in the field of electrolyte, can solve the problems of reducing the uniformity, compactness, gloss, hardness, wear resistance, corrosion resistance, and poor performance of the oxide film, etc., and achieve low price, Good adhesion and easy operation

Active Publication Date: 2010-06-09
HANGZHOU WIN WIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The anodic oxidation of silicon-aluminum alloys, especially high-silicon aluminum alloys (the mass fraction of Si element is not less than 1%) is difficult, because the usual anodic oxidation process , the Si in the alloy is neither soluble in the acidic electrolyte nor reacts with the electrolyte. After anodic oxidation, it remains on the surface of the alloy to form "silicon fume", which causes dark spots and black spots on the surface of the oxide film, reducing the uniformity of the oxide film. Density and gloss, so that the properties of the oxide film, such as hardness, wear resistance, corrosion resistance, etc. are greatly reduced
The higher the silicon content, the more difficult it is to anodize the alloy, and the poorer the performance of the obtained oxide film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Firstly, surface pretreatment is carried out on the AC1A high-silicon aluminum alloy (the mass fraction of Si element is 1.2%), and the steps include degreasing and water washing. The specific process is as follows:

[0037] Degreasing: immerse the AD1A high-silicon aluminum alloy in the washing solution (solvent is water) of the following composition for degreasing treatment:

[0038] Sodium carbonate 25g / L

[0039] Sodium Phosphate 20g / L

[0040] Sodium tripolyphosphate 5g / L

[0041] Sodium hydroxide 0.5g / L

[0042] Washing: Rinse the degreasing AD1A high-silicon aluminum alloy surface with deionized water for 2 minutes.

[0043] Then prepare the electrolyte solution at room temperature according to the following formula, and the solvent is 1 liter of water:

[0044] Sodium silicate (Na 2 SiO 3 ) 0.12mol / L (15g / L)

[0045] Sodium trimetaphosphate (NaPO 3 ) 3 0.013mol / L (4g / L)

[0046] Borax (Na 2 B 4 o 7 10H 2 O) 0.013mol / L (5g / L)

[0047] Sodium...

Embodiment 2

[0056] Referring to Example 1, the ADC7 high-silicon aluminum alloy (Si element mass fraction 4.5-9.5%) is pretreated by surface degreasing and water washing.

[0057] Then prepare the high-silicon aluminum alloy anodic oxidation electrolyte at room temperature according to the following formula, and the solvent is 1 liter of water:

[0058] Sodium silicate (Na 2 SiO 3 ) 0.12mol / L (15g / L)

[0059] Sodium trimetaphosphate (NaPO 3 ) 3 0.033mol / L (10g / L)

[0060] Borax (Na 2 B 4 o 7 10H 2 O) 0.010mol / L (4g / L)

[0061] Sodium molybdate (Na 2 MoO 4 2H 2 O) 8g / liter electrolyte

[0062] Disodium ethylenediaminetetraacetic acid (EDTA-2Na) 2g / liter electrolyte

[0063] Then refer to Example 1 to anodize the ADC7 high-silicon aluminum alloy, the difference is the formula of the electrolyte and the parameters of the anodization process. The formula of electrolytic solution is as above, and the anodic oxidation process parameter different from embodiment 1 is as foll...

Embodiment 3

[0069] Referring to Example 1, the ADC12 high-silicon aluminum alloy (Si element mass fraction 9.6-12%) was pretreated by surface degreasing and water washing.

[0070] Then prepare the high-silicon aluminum alloy anodic oxidation electrolyte at room temperature according to the following formula, and the solvent is 1 liter of water:

[0071] Sodium silicate (Na 2 SiO 3 ) 0.082mol / L (10g / L)

[0072] Sodium trimetaphosphate (NaPO 3 ) 3 0.020mol / L (6g / L)

[0073] Borax (Na 2 B 4 o 7 10H 2 O) 0.026mol / L (10g / L)

[0074] Sodium tungstate (Na 2 WO 4 2H2 O) 5g / L electrolyte

[0075] Sodium molybdate (Na 2 MoO 4 2H 2 O) 10g / liter electrolyte

[0076] Disodium ethylenediaminetetraacetic acid (EDTA-2Na) 1g / liter electrolyte

[0077] Then refer to Example 1 to anodize the ADC12 high-silicon aluminum alloy, the difference is the formula of the electrolyte and the parameters of the anodization process. The formula of electrolytic solution is as above, and the...

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Abstract

The invention provides an electrolyte, an anodization method and an anodized silicon-aluminum alloy. The electrolyte contains equivalent silicate ions and equivalent metaphosphate ions, wherein the equivalent silicate ions refer to silicate ions converted from all ions and particles containing a silicon element based on equal silicon element content, and the quivalent metaphosphate ions refer to metaphosphate ions converted from all ions and particles containing a phosphor element based on equal phosphor element content; and the electrolyte refers to an alkaline hydrosol. By adopting the electrolyte, an anodization film with good hardness, wear resistance and corrosion resistance can be formed on the surface of the silicon-aluminum alloy.

Description

technical field [0001] The invention relates to an electrolytic solution, in particular to an anodic oxidation electrolytic solution of silicon-aluminum alloy, and anodic oxidized silicon-aluminum alloy obtained by using the electrolytic solution. Background technique [0002] The anodic oxidation of silicon-aluminum alloys, especially high-silicon aluminum alloys (the mass fraction of Si element is not less than 1%) is difficult, because in the usual anodic oxidation process, Si in the alloy is neither soluble in acidic electrolyte nor compatible with The electrolyte reacts, and after anodic oxidation, it remains on the surface of the alloy to form "silicon fume", which causes dark spots and black spots on the surface of the oxide film, reduces the uniformity, compactness and gloss of the oxide film, and improves the performance of the oxide film, such as hardness. , Wear resistance, corrosion resistance, etc. are greatly reduced. The higher the silicon content, the more d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 谢呈德高乡明涂俊凯
Owner HANGZHOU WIN WIN TECH CO LTD
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