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Titanium plate alkali washing and pickling method

A technology of alkaline acid and alkaline cleaning of titanium plates, which is applied in the field of alkaline acid cleaning of titanium plates, can solve the problems that the surface of titanium alloys is easily oxidized, oxidized, and the tempering time of titanium and titanium alloys is long, and the surface quality is good and the method is simple , the effect of convenient operation

Inactive Publication Date: 2019-02-05
宝鸡市华烨钛镍金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atmospheric furnace annealing is used. The surface of titanium alloy is easily oxidized during the annealing process. 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. And the tempering time of titanium and titanium alloy is longer, so the surface oxidation is more serious during the annealing process

Method used

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Embodiment Construction

[0018] The present invention will be described in detail below with regard to specific embodiments.

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

[0020] Step 1: Alkaline Wash

[0021] Submerge the titanium plate in an alkali melt at a temperature of 410° C. for 60 s. The alkali melt is composed of a mixture of 96% sodium hydroxide and 4% sodium nitrate by weight;

[0022] Step 2: Washing

[0023] Submerging the titanium plate after the alkali cleaning described in step 1 in the water of a tank with a temperature between 50° C., and washing away the alkali molten liquid on the surface of the alkali-cleaned titanium plate described in step 1 with water;

[0024] Step 3: Pickling

[0025] Submerge the water-washed titanium plate in step 2 for pickling in an aqueous solution of nitric acid at a temperature between 50° C., wherein the aqueous solution of nitric acid is composed of a mixture of 30% nitric acid and 70% water by weig...

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Abstract

The invention discloses a titanium plate alkali washing and pickling method comprising alkali washing, water washing, pickling and alkali washing. Alkali melt water is formed by mixing 95%-98% of sodium hydroxide and 2% to 5% of sodium nitrate by weight. A nitric acid aqueous solution is formed by mixing 25%-33% of nitric acid and 67%-75% of water by weight. Surface scale of an iron alloy obtainedafter alkali pickling is completely washed away, no peracid phenomenon occurs, the surface is grayish white, the surface quality is good, the method is simple, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of chemical surface treatment of metal materials, and in particular relates to an alkali pickling method for a titanium plate. 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 steel, titanium and aluminum, and is also known as "space metal" and "ocean metal". In the prior art, the chemical treatment method for the surface of titanium alloy is generally pickling with alkaline washing plus H2S04, HC1, HN03 tri-acid mixed solution. After pickling, the surface of titanium alloy billet or material is prone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/32C23G1/10
CPCC23G1/32C23G1/106
Inventor 石璋
Owner 宝鸡市华烨钛镍金属有限公司