One-step method for making colour oxide film on surface of aluminium and aluminum alloy

A technology of aluminum alloy surface and oxide film, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of complicated process and strict pretreatment requirements, and achieve simple process, uniform and dense surface, and high wear resistance effect on corrosion resistance

Inactive Publication Date: 2006-12-06
YANSHAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, this method of oxidation and coloring is divided into two steps, th

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 0.5 hours, a yellow oxide film can be formed on the surface of pure aluminum.

Embodiment 2

[0018] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 1 hour, a brown oxide film can be formed on the surface of pure aluminum.

Embodiment 3

[0020] Put pure aluminum directly in a solution containing sodium silicate concentration 3 g / L, sodium hydroxide concentration 1 g / L, potassium permanganate concentration 2 g / L, sodium molybdate concentration 0.9 g / L, sodium fluorosilicate concentration 3 gram / liter, sodium tungstate concentration 2 grams / liter aqueous solution for oxidation. The oxidation current density is 0.1 A / cm 2 , the temperature is 40°C, and the oxidation time is 1.5 hours, a black oxide film can be formed on the surface of pure aluminum.

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Abstract

This invention discloses a technique for forming a color oxide film on the surface of aluminum and aluminum alloy products. The technique comprises: oxidizing aluminum or aluminum alloy in an aqueous solution of sodium silicate 2-10 g/L, sodium hydroxide 0.5-3 g/L, sodium molybdate 0.2-4 g/L, sodium silicofluoride 0.1-9 g/L, sodium tungstate 0.2-10 g/L, and potassium permanganate 0.5-4 g/L at 10-50 deg.C and current density of 0.08-2 A/cm2 for 0.5-3 h to obtain a yellow/brown/black oxide film. The oxide film is uniform and compact, and has a thickness of 20-200 mum. Besides, the oxide film also has good wear and corrosion resistance. The technique has such advantages as simple process, and no pollution.

Description

technical field [0001] The invention relates to a process for forming colored oxide film on the surface of aluminum and aluminum alloy. Background technique [0002] The invention relates to a method for preparing a colored oxide film layer by direct oxidation on the surface of aluminum and aluminum alloy. The preparation method of the colored oxide film on the surface of aluminum and aluminum alloy is to first anodize aluminum and aluminum alloy in sulfuric acid electrolyte, and then carry out electrolytic treatment in the salt solution containing metal. Under the action of electric field, metal ions enter and deposit into the pores of the oxide film, thereby coloring the surface of aluminum and aluminum alloys. This coloring method is currently widely used in the surface coloring of aluminum profiles for construction. [0003] The general electrolytic coloring process mainly includes oil removal and degreasing, alkali etching, neutralization, anodic oxidation, and electr...

Claims

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Application Information

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IPC IPC(8): C25D11/14
Inventor 于升学韩婧
Owner YANSHAN UNIV
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