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A kind of environment-friendly titanium alloy anodic oxidation pretreatment method

An anodic oxidation and titanium alloy technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of strong skin irritation, environmental pollution, corrosion, etc., and achieve low cost, convenient operation, and solution composition simple effect

Inactive Publication Date: 2015-09-16
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the anodic oxidation pretreatment solutions of titanium alloys contain hydrofluoric acid, which is strongly irritating and corrosive to the skin, and hydrofluoric acid can also be absorbed through the skin to cause serious poisoning, and hydrofluoric acid is generally combined with nitric acid Combined use will produce NO, NO 2 Toxic gases, polluting the environment
The recently invented hydrogen peroxide-sodium hydroxide system is used as the main component of the pretreatment solution, which meets the requirements of environmental protection, but the hydrogen peroxide is extremely unstable, which is not conducive to operation and solution component detection, and increases the process cost of pretreatment

Method used

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  • A kind of environment-friendly titanium alloy anodic oxidation pretreatment method
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  • A kind of environment-friendly titanium alloy anodic oxidation pretreatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1. Prepare alkaline degreasing liquid

[0020] Add 20g of sodium silicate, 20g of sodium carbonate, and 50g of sodium hydroxide to 1L of deionized water, stir and dissolve uniformly.

[0021] 2. Prepare anodizing pretreatment solution

[0022] Add 5g of chromotropic acid and 5g of oxalic acid to 1L of deionized water, stir and dissolve evenly.

[0023] 3. Anodizing pretreatment

[0024] 1) Place the titanium alloy (TB6 titanium alloy in this example) in an acetone solution for ultrasonic cleaning for 5-10 minutes, and rinse with distilled water for use;

[0025] 2) Heat the prepared degreasing liquid in a water bath to 60°C, and put the titanium alloy treated in step 1) into the prepared degreasing liquid for alkaline washing and degreasing for 20 minutes, and then heat by flowing Washing in water, running cold water;

[0026] 3) Heat the prepared pretreatment solution in a water bath to 80°C, and put the titanium alloy treated in step 2) into the prepared anodizing pretreatmen...

Embodiment 2

[0031] 1. Prepare alkaline degreasing liquid

[0032] Add 20g of sodium silicate, 20g of sodium carbonate, and 50g of sodium hydroxide to 1L of deionized water, stir and dissolve uniformly.

[0033] 2. Prepare anodizing pretreatment solution

[0034] Add 1g of chromotropic acid and 10g of oxalic acid to 1L of deionized water, stir and dissolve evenly.

[0035] 3. Anodizing pretreatment

[0036] 1) Put the titanium alloy in an acetone solution for ultrasonic cleaning for 5-10 minutes, and then rinse it with distilled water for later use;

[0037] 2) Heat the prepared degreasing liquid in a water bath to 60°C, and put the titanium alloy treated in step 1) into the prepared degreasing liquid for alkaline washing and degreasing for 20 minutes, and then heat by flowing Washing in water, running cold water;

[0038] 3) Heat the prepared pretreatment solution in a water bath to 50°C, and put the titanium alloy treated in step 2) into the prepared anodizing pretreatment solution for 30 minute...

Embodiment 3

[0043] 1. Prepare alkaline degreasing liquid

[0044] Add 20g of sodium silicate, 20g of sodium carbonate, and 50g of sodium hydroxide to 1L of deionized water, stir and dissolve uniformly.

[0045] 2. Prepare anodizing pretreatment solution

[0046] Add 1g of chromotropic acid and 2g of oxalic acid to 0.5L of deionized water, stir and dissolve evenly.

[0047] 3. Anodizing pretreatment

[0048] 1) Put the titanium alloy in an acetone solution for ultrasonic cleaning for 5-10 minutes, and then rinse it with distilled water for later use;

[0049] 2) Heat the prepared degreasing liquid in a water bath to 60°C, and put the titanium alloy treated in step 1) into the prepared degreasing liquid for alkaline washing and degreasing for 20 minutes, and then heat by flowing Washing in water, running cold water;

[0050] 3) Heat the prepared pretreatment solution in a water bath to 70°C, and put the titanium alloy treated in step 2) into the prepared anodizing pretreatment solution for 20 minut...

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Abstract

The invention discloses an anodic oxidation pretreatment method for an environment-friendly titanium alloy. The anodic oxidation pretreatment method is characterized in that an anodic oxidation treatment solution is composed of chromotropic acid, oxalic acid and other substances. The pretreatment solution is formed by adding 1-5g of chromotropic acid and 5-10g of oxalic acid into 1L of deionized water. The anodic oxidation pretreatment method disclosed by the invention comprises the steps of: ultrasonic cleaning; alkali washing and oil removing; pretreatment; and deionized water cleaning. The anodic oxidation pretreatment method disclosed by the invention is used for effectively reducing the damage of strong acidic materials such as hydrofluoric acid, nitric acid and the like introduced to the current anodic oxidation pretreatment process to human bodies and the environment and effectively improving the condition of high treatment difficulty of wastes on the premise of ensuring the surface activation, the smooth finish and the subsequent anodic oxidation filming effect. The anodic oxidation pretreatment method for the environment-friendly titanium alloy is convenient to operate, simple in process, stable in component and easy to detect, and new concepts of green and safe production and sustainable development are realized.

Description

Technical field [0001] The invention relates to a titanium alloy anodic oxidation pretreatment method, in particular to a titanium alloy anodic oxidation pretreatment method under safe and environmentally friendly conditions, and belongs to the technical field of titanium alloy surface treatment. Background technique [0002] Titanium and titanium alloys have many excellent properties such as high specific strength, strong heat resistance, and corrosion resistance, and have important applications in aerospace, biomedical and other fields. A natural oxide film will be formed on the surface of the titanium alloy. The natural oxide film and pollution layer on the surface of the titanium alloy must be removed before anodizing to obtain a smooth and clean activated surface for the subsequent anodizing step. At present, most of the pretreatment solutions for titanium alloy anodization contain hydrofluoric acid. Hydrofluoric acid is strongly irritating and corrosive to the skin. Hydrofl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26
Inventor 刘建华张优于美李松梅甘武奎超敏吴筱兰
Owner BEIHANG UNIV
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