Method for coloring titanium and titanium alloy surface through anodization

A technology of anodizing and titanium alloy, which is applied in the field of anodizing and coloring technology on the surface of titanium and titanium alloy, can solve the problems of unfavorable safety production, fingerprint pollution color, affecting decoration effect, etc., and achieve good practical application prospects, good corrosion resistance, The effect of good decorative effect

Inactive Publication Date: 2011-11-16
XIAMEN CASAMOY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The anodic oxidation process generally includes an acid corrosion activation step, and the main substance generally used is a solution containing hydrofluoric acid (or fluoride), which seriously pollutes the environment and is not conducive to safe production
[0007] (2) The surface of the oxide film obtained by the anodic oxidation process is relatively rough, the color is not gorgeous enough, and the gloss is not high enough, so the application in the field of decorations (such as titanium jewelry) is limited
[0008] (3) The electrolyte used in the anodic oxidation process is generally based on phosphoric acid and phosphate, which makes it difficult to treat the waste liquid
[0012] (3) The surface energy of the anodized film is high, and the surface of the film is easy to absorb dirty substances and be polluted, and it is easy to cause fingerprint pollution to change the color; in addition, it is difficult to recover after being polluted, which affects its appearance and decorative effect

Method used

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  • Method for coloring titanium and titanium alloy surface through anodization
  • Method for coloring titanium and titanium alloy surface through anodization
  • Method for coloring titanium and titanium alloy surface through anodization

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Alkaline washing to remove oil. At room temperature, add sodium carbonate (20g), sodium phosphate (20g) and sodium silicate (10g) in turn to deionized aqueous solution (1L), and heat to 80°C after the dissolution is complete. Two identical TC4 titanium alloy samples with a size of 10mm×10mm×2mm were put into the alkaline cleaning solution for continuous ultrasonic stirring. After 15 minutes of treatment, they were taken out and washed with flowing deionized water until a uniform water film formed on the surface of the samples.

[0031] 2) Electrolytic polishing. At room temperature, add 200g of sulfamic acid, 1L of formamide and 0.5g of cetyltrimethylammonium bromide to the electrolytic cell (1.5L) to prepare an electrolytic polishing solution; Put the titanium alloy A in this polishing electrolyte, with the sample as the anode and the stainless steel mesh as the cathode, apply a voltage of 15V and 10A·dm -2 Current density, take it out after 50s of treatment; and wa...

Embodiment 2

[0045]1) Alkaline washing to remove oil, at room temperature, add sodium carbonate (20g), sodium phosphate (20g), sodium silicate (15g) in turn to deionized aqueous solution (1L), and heat to 70°C after the dissolution is complete. Put the workpiece into the solution and continue ultrasonic stirring, take it out after 15 minutes of treatment, and wash it with flowing deionized water until a uniform water film is formed on the surface of the sample.

[0046] 2) Electrolytic polishing, at 25°C, put the titanium workpiece after alkaline cleaning into the electrolytic polishing solution of Example 1, with the sample as the anode and the titanium mesh as the cathode, apply a voltage of 35V and 15A dm -2 Current density, take it out after 6 minutes of treatment, and clean it with flowing deionized water.

[0047] 3) Anodizing coloring, at 25°C, add 45g of sodium silicate, 15g of tartaric acid, and 5g of glycerol in deionized aqueous solution (800mL) while stirring, and then add deio...

Embodiment 3

[0056] 1) Alkaline washing and degreasing, same as Example 2.

[0057] 2) Electropolishing. At 20°C, add 200g of sulfamic acid, 1L of formamide, 0.5g of cetyltrimethylammonium bromide, and 0.05g of surfactant to the electrolytic cell (1.5L) to prepare electrolytic polishing. Polishing solution; put the titanium alloy sample after degreasing treatment into the polishing electrolyte, with the sample as the anode and the titanium mesh as the cathode, apply a voltage of 20V and 10A·dm -2 Current density, take it out after 50s of treatment; and clean it with flowing deionized water.

[0058] 3) Anodizing coloring, at 25°C, add 40g of sodium silicate, 10g of tartaric acid, and 2g of glycerol in deionized aqueous solution (800mL) under stirring, and then add deionized water to 1L to prepare an anodic oxidation coloring solution. Put the titanium alloy after the above treatment into the solution, use the stainless steel plate as the cathode, and the titanium alloy as the anode, apply...

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Abstract

The invention relates to a method for coloring the titanium and titanium alloy surface through anodization. The invention aims to provide a novel fluoride-free and environmental-friendly technology to improve the present titanium and titanium alloy anodization technology generally employing the highly toxic substance hydrofluoric acid, so that the requirements for green and safe production and sustainable development can be met. The method comprises the following processes: acceptance inspection before anodization, hanging, oil removing, flowing hot water washing, flowing cold water washing, electrolytic polishing, flowing cold water washing, deionized water washing, anodization, flowing cold water washing, flowing hot deionized water washing, dismounting, drying and inspection. The anodization coloring technology of the invention has low cost, simple operation, and can generate colorful and bright-colored high quality oxide-film layers, characterized by fingerprint pollution prevention on the surface, strong stain resistance and excellent decorative effect.

Description

technical field [0001] The invention relates to an anodic oxidation and coloring process on the surface of titanium and titanium alloy; it is especially suitable for obtaining anodic oxidation film on the surface of titanium or titanium alloy. Background technique [0002] In recent years, titanium and titanium alloys have attracted more and more attention because of their unique properties, so they are widely used in various fields such as national defense cutting-edge technology, civil industry, and people's livelihood products. For example: in aerospace, titanium and titanium alloys are used in the production of new-generation aircraft due to their small specific gravity, light weight, and high specific strength; in medicine, titanium and titanium alloys have good corrosion resistance and good biocompatibility. With low human repellency, it is widely used in medical fields such as tooth and bone implants, and intravascular stents, and has become an eye-catching biometal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 马薇薇刘忙仔洪艳萍
Owner XIAMEN CASAMOY TECH
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