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Method for removing titanium and oxide skin on alloy surface of titanium

An oxide scale and alloy technology, applied in the direction of metal material coating process, can solve the problems of high production cost, large environmental protection pressure, high cost, etc., and achieve the effect of easy operation and implementation, improving product quality and reducing production cost.

Active Publication Date: 2016-04-27
何百寅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, high-temperature molten alkaline leaching requires high-temperature reaction conditions and the use of large amounts of NaOH and NaNO 3 , and if the conditions are not properly controlled during the molten alkali leaching process, the titanium plate (especially the thin plate) may catch fire or even explode, endangering the safety of production
Secondly, when pickling with mixed acid, the consumption of nitric acid and hydrofluoric acid is large, not only the production cost is high, but also it will bring great environmental protection pressure
During the pickling process, a large amount of nitrogen oxides and hydrogen fluoride gas will escape, polluting the atmosphere, especially hydrogen fluoride, which will cause unhealable chemical burns and poisoning to people
Moreover, the nitric acid, nitrate and fluoride in the pickling waste liquid cannot be separated by precipitation, which will cause very serious water pollution
To sum up, the high-temperature molten alkaline leaching-mixed acid pickling process is a typical process with high energy consumption, high pollution and high cost.

Method used

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  • Method for removing titanium and oxide skin on alloy surface of titanium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1. Dissolving 0.03 g of tetra-p-sulfonate phenylporphyrin iron (III) in 1 L of HCl solution with a concentration of 150 g / L, and 80 g of benzylamine were prepared as pickling solution, and 0.25 kg of titanium disks were cleaned at 80° C. strip.

[0037] Processing steps:

[0038] (1) Immerse the material to be cleaned in the pickling solution for 40 minutes;

[0039] (2) Put the cleaned material in water and ultrasonically treat it with an ultrasonic generator for 60s; (3) Immerse the cleaned material in a mixed solution of nitric acid and hydrofluoric acid for 10s; (4) Rinse the cleaned material with high-pressure water; (5) Soak the material to be cleaned in a borax solution with a pH of 10 and a temperature of 80°C for 2 minutes. After taking it out, rinse it with high-pressure water and dry it.

[0040] Treatment result: The scale of the titanium wire rod is completely removed, and its surface is a silver-white frosted surface without over-corrosion.

[0...

Embodiment 2

[0043] Example 2, 0.06 g of tetra-p-sulfonate phenylporphyrin iron (III) was dissolved in 1 L of HCl solution with a concentration of 250 g / L, and 120 g of benzylamine was prepared as pickling solution, and 0.30 kg of Ti was cleaned at 80° C. -6Al-4V wire rod.

[0044] The processing steps are the same as in Example 1: soaking time of the cleaned material is 15 minutes; ultrasonic treatment is 30 s.

[0045] Processing result and control test are all the same as embodiment 1.

Embodiment 3

[0046] Embodiment 3, be the H of 200g / L in 1L concentration 2 SO 4 Dissolve 0.06 g of tetra-p-sulfonate phenylporphyrin iron (III) in the solution, and 110 g of benzylamine to prepare a pickling solution, and clean 0.33 kg of titanium wire rod at 90° C.

[0047] The processing steps are the same as in Example 1: the soaking time of the cleaned material is 35 minutes; ultrasonic treatment is 40 s.

[0048] Processing result and control test are all the same as embodiment 1.

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Abstract

The invention discloses a method for removing titanium and an oxide skin on the alloy surface of titanium. The method comprises the following steps: A1. soaking titanium and an alloy material thereof in a pickling solution; A2. washing titanium and the alloy material thereof with high pressure water or cleaning titanium and the alloy material thereof in an ultrasonic cleaner; A3. putting titanium and the alloy material thereof into a nitric acid and hydrofluoric acid mixed solution for passivation; A4. putting titanium and the alloy material thereof into a borax solution for neutralization, wherein the pH value of the borax solution is not less than 10; A5. washing the neutralized titanium and alloy material thereof with high pressure water; and A6. drying titanium and the alloy material thereof. The pickling solution is prepared by taking sulfuric acid or hydrochloric acid as a pickling medium and adding proper amount of additives including quadri-p-sulfophenyl ferroporphyrin (III) and benzene methanamine. According to the invention, molten alkaline leaching and nitric acid and hydrofluoric acid pickling are not used, and the method has the characteristics of being energy-saving, economical and environment-friendly, and easy to realize industrialization.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a method for removing oxide scales on the surface of titanium and its alloys. Background technique [0002] Since the advent of titanium and its alloys, the traditional methods of removing the oxide scale on its surface have always had many problems such as high energy consumption, high pollution, high cost, and difficulty in recycling waste residues and liquids, which can be described as a worldwide problem. [0003] The theoretical basis of traditional technology is that among the black oxide scales on the surface of titanium and its alloys, titanium oxides are relatively stable and do not react with acids and bases in the water phase; they can only be formed by reacting with high-temperature molten alkali containing oxidants Soluble titanate for removal by further pickling. In the process of high-temperature alkali cleaning, titanium oxide scales give different oxidation ...

Claims

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Application Information

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IPC IPC(8): C23G1/10C23C22/34
CPCC23C22/34C23G1/106
Inventor 何百寅
Owner 何百寅
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