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Technology process for removing scale cinder in thermal forming of TC4 titanium alloy

A process method and hot forming technology, applied in the field of oxide scale removal technology in TC4 titanium alloy hot forming, can solve the problems of difficult removal, time-consuming and laborious, and achieve the effect of good effect and simple maintenance.

Inactive Publication Date: 2013-05-22
SHENYANG AIRCRAFT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxide skin is firmly bonded to the substrate and is not easy to remove. If it is mechanically polished, scratches are likely to appear on the substrate, and it is easy to damage the surface of the substrate by sand blowing, and these two methods are time-consuming and laborious.

Method used

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  • Technology process for removing scale cinder in thermal forming of TC4 titanium alloy
  • Technology process for removing scale cinder in thermal forming of TC4 titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] During alkaline cleaning, NaNO 2 Added as an oxidant in NaOH solution, the purpose is to passivate the surface of TC4 titanium alloy and prevent the alkali solution from corroding the alloy matrix during boiling. Use a temperature control device with electronic adjustment to heat the stainless steel container containing the alkali cleaning solution until the alkali cleaning solution boils. Put the TC4 titanium alloy hot-formed parts, keep the lye in a boiling state through the temperature control device, take out the sample after 1-4 hours, wash it with clean water, then put the sample into the pickling tank, and immerse it for 1-4 hours. Take it out after 4 minutes, wash and blow dry.

[0015] Alkaline cleaning solution: mix 600g of sodium hydroxide and 200g of sodium nitrite and dissolve in 1 liter of water; configure pickling solution: mix 50g of hydrofluoric acid and 350g of nitric acid and dissolve in 1 liter of water.

Embodiment 2

[0017] In addition to configuring alkaline cleaning solution: mix 500g of sodium hydroxide and 150g of sodium nitrite and dissolve in 1 liter of water; configure pickling solution: mix 10g of hydrofluoric acid and 300g of nitric acid and dissolve in 1 liter of water Except in the water, all the other are identical with embodiment one.

Embodiment 3

[0019] In addition to configuring alkaline cleaning solution: mix 700g of sodium hydroxide and 250g of sodium nitrite and dissolve in 1 liter of water; configure pickling solution: mix 90g of hydrofluoric acid and 450g of nitric acid and dissolve in 1 liter of water Except in the water, all the other are identical with embodiment one.

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Abstract

The invention relates to a technology process for removing a scale cinder in thermal forming of a TC4 titanium alloy. The technology process comprises the following steps: 1) preparing a soda-wash solution, namely 500 to 700g of sodium hydroxide with 150 to 250g of sodium nitrite, and dissolving the mixture into 1 liter of water; 2) preparing pickling solution, namely 10 to 90g of hydrofluoric acid with 300 to 450g of nitric acid, and dissolving the mixture into 1 liter of water; 3) placing a TC4 titanium alloy thermal forming component into the prepared soda-wash solution for 1 to 4 hours, wherein the temperature of the solution is 140 to 170 DEG C; 4) taking out the TC4 titanium alloy thermal forming component, and washing by the clean water; 5) placing the TC4 titanium alloy thermal forming component into the pickling solution, dipping for 1 to 4 minutes at room temperature, then taking out, cleaning and drying in a blowing way. The technology process is a chemical method which can effectively remove the scale cinder formed on the surface of a TC4 titanium alloy thermal forming part, and a titanium alloy thermal forming substrate is not damaged.

Description

technical field [0001] The invention relates to a process method for removing scale in TC4 titanium alloy thermoforming, belonging to a chemical treatment method for titanium alloys. Background technique [0002] During the hot forming process of TC4 titanium alloy material, a layer of oxide skin will be formed on the surface of the titanium alloy. The color of the oxide skin obtained is different with different hot forming temperatures. Among them, when the thermoforming temperature is about 550 degrees, the color of the oxide skin is blue, and when the thermoforming temperature is about 900 degrees, the color of the oxide skin is taupe. The oxide skin is firmly bonded to the substrate and is not easy to remove. If it is mechanically polished, scratches are likely to appear on the substrate, and it is easy to damage the surface of the substrate by sand blowing, and these two methods are time-consuming and laborious. Contents of the invention [0003] The technical proble...

Claims

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Application Information

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IPC IPC(8): C23G1/00
Inventor 乔永莲杨凌旭胡小锋孙福权沙春鹏张晓巍
Owner SHENYANG AIRCRAFT CORP