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Alkali-acid washing method for titanium alloy

A technology for titanium alloy and alkaline pickling, which is applied in the field of alkaline pickling of titanium alloys, titanium and titanium alloy billets, and material production. problem, to achieve the effect of good surface quality, easy operation and strong practicability

Active Publication Date: 2010-05-19
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atmospheric roller hearth furnace is used for annealing. During the annealing process, the surface of titanium alloy is easily oxidized. Titanium and titanium alloys start to absorb hydrogen at 250°C, oxygen at 400°C, and nitrogen at 600°C. Generally, the annealing temperature is higher than 600°C. gas, and the annealing time of titanium and titanium alloys is longer, so the surface oxidation is more serious during the annealing process

Method used

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  • Alkali-acid washing method for titanium alloy

Examples

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Embodiment 1

[0019] A method for alkaline pickling of titanium alloy plates, comprising the following steps:

[0020] (1) Hang the TC4 titanium alloy plate on the special alkali-resistant and acid-resistant material frame;

[0021] (2) Alkali cleaning: Hang the material frame with TC4 alloy at a temperature of 400-500°C with a crane (crane), and the weight percentage is 70-80% (Wt) NaOH+20-30% (Wt) NaNO 3 In the alkali molten liquid between, the alkali washing time is controlled between 2 and 25 minutes, and the specific time depends on the surface condition;

[0022] (3) Water washing: the TC4 titanium alloy plate after alkali washing is hoisted into a water tank with a temperature between 40 and 100 ° C with a crane (crane), and the alkali molten liquid is washed;

[0023] (4) If after washing with water, it is found that there are still many defects such as scale on the surface, repeat steps (2) and (3);

[0024] (5) Pickling: hoist the washed TC4 titanium alloy plate material frame ...

Embodiment 2

[0030] A kind of alkali pickling method of titanium alloy, comprises the following steps:

[0031] a. Alkali cleaning: immerse the titanium alloy billet or material in an alkali melt with a temperature between 400 and 500°C for 25 minutes. The alkali melt is composed of 80% by weight sodium hydroxide (NaOH) and 20% sodium nitrate (NaNO 3 ) mixed composition;

[0032] b. Water washing: immerse the alkali-washed titanium alloy billet or material in a water tank with a temperature between 40 and 100 ° C, and wash away the alkali molten liquid on the surface of the titanium alloy billet or material;

[0033] c. Pickling: immerse the washed titanium alloy billet or material in sulfuric acid (H 2 SO 4 ) pickling in aqueous solution, control Fe in pickling solution 2+ The concentration is less than 250g / l, and the pickling and immersion time is 12 minutes. This step is mainly to wash off defects such as scale on the surface of the titanium alloy billet or material;

[0034] d. P...

Embodiment 3

[0036] A kind of alkali pickling method of titanium alloy, comprises the following steps:

[0037] a. Alkali cleaning: immerse the titanium alloy billet or material in an alkali molten liquid with a temperature between 400 and 500 °C for 20 minutes. The alkali molten liquid is composed of 75% by weight sodium hydroxide (NaOH) and 25% sodium nitrate (NaNO 3 ) mixed composition;

[0038] b. Water washing: immerse the alkali-washed titanium alloy billet or material in a water tank with a temperature between 40 and 100 ° C, and wash away the alkali molten liquid on the surface of the titanium alloy billet or material;

[0039] c. Pickling: immerse the washed titanium alloy billet or material in sulfuric acid (H 2 SO 4 ) pickling in aqueous solution, control Fe in pickling solution 2+ The concentration is less than 250g / l, and the pickling and dipping time is 8 minutes. This step is mainly to wash off defects such as scale on the surface of the titanium alloy billet or material...

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Abstract

The invention provides an alkali-acid washing method for titanium alloy, which is characterized by comprising the following: a step of alkali washing, which is to dip titanium alloy billet or material in alkali melted liquid at 400 to 500 DEG C for 2 to 25 minutes, wherein the alkali melted liquid is formed by mixing sodium hydroxide in a weight percentage of 70 to 80 percent and nitric acid in a weight percentage of 20 to 30 percent; a step of water washing, which is to dip the titanium alloy billet or material subjected to alkali washing in a water tank for water washing at 40 to 100 DEG C; a step of acid washing, which is to dip titanium alloy subjected to water washing in sulfuric acid at 60 to 100 DEG C in a concentration of 25 to 45 g / l for 1.5 to 12 minutes of acid washing; and a step of passivating and whitening, which is to dip the titanium alloy subjected to acid washing in sodium nitrate aqueous solution at 60 to 100 DEG C in a concentration of 50 to 170 g / l for 1.5 to 12 minutes. Due to the method, surface oxide scales of the titanium alloy subjected to alkali-acid washing are thoroughly washed away with no superacid phenomenon, and the titanium alloy is gray in surface and good in surface quality.

Description

technical field [0001] The invention belongs to a metal material surface chemical treatment method in which the surface reacts with a reaction liquid, and relates to an alkali pickling method for a titanium alloy. It is mainly suitable for the production of titanium and titanium alloy billets and materials. Background technique [0002] Titanium and titanium alloys are emerging structural and functional materials. They have many advantages such as high specific gravity to strength ratio, small thermal expansion coefficient, good corrosion resistance, high temperature performance, low temperature toughness and low temperature superconductivity. They are widely used in aerospace, military industry and chemical industry. It is widely used in civilian fields such as petroleum, marine, and sports. It is called the "third metal" after steel and aluminum, and is also called "space metal" and "ocean metal". [0003] In the prior art, the chemical treatment method for the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/00C23G1/20C23G1/10C23C22/68
Inventor 周茂华杜礼章刘刚魏育军李守军罗通伟何云华杨再春邝素军田小辉
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL