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Technology for reducing fluorin residue on acid cleaned surface of zirconium alloy pipe

A process method and technology of zirconium alloy tubes are applied in the direction of liquid cleaning methods, chemical instruments and methods, cleaning methods and utensils, etc., so as to increase the safety of use, meet the requirements of use, and improve the service life.

Active Publication Date: 2010-04-28
国核宝钛锆业股份公司 +1
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Problems solved by technology

At present, foreign research on the process of reducing fluorine residues on the surface of zirconium alloys is still in the exploratory stage, while domestic research on this aspect is almost non-existent.

Method used

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  • Technology for reducing fluorin residue on acid cleaned surface of zirconium alloy pipe

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Embodiment Construction

[0021] The following is a detailed description of the specific implementation process of reducing the fluorine residue on the pickling surface of the nuclear zirconium alloy tube with a specification of Φ13×1mm. The specific implementation steps are:

[0022] a) with NH 4 HCO 3 Solution immersion, immerse the Φ13×1mm zirconium alloy tube after pickling into NH 4 HCO 3 After being in the solution, swing up and down, and the soaking time is 75 seconds, of which NH 4 HCO 3 The volume ratio of each component in the solution is: NH 4 HCO 3 : Demineralized water = 1:10;

[0023] b) Rinse with NaOH solution, and use NH 4 HCO 3 The Φ13×1mm zirconium alloy tube dipped in the solution is immersed in the prepared NaOH solution at a constant speed at an angle of about 45 degrees between its length direction and the horizontal plane, and then swings up and down. The dipping temperature is about 45 ° C ~ 55 ° C. The time is about 75 seconds, wherein the volume ratio of each compone...

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Abstract

The invention relates to the field of a technology for reducing fluorin residue on the acid cleaned surface of a zirconium alloy pipe, comprising the following steps: sequentially rinsing the zirconium alloy pipe with NH4CO3 solution and NaOH solution; rinsing the zirconium alloy pipe with hot softened water, and washing the zirconium alloy pipe with cold softened water; and blowing and scrubbing the zirconium alloy pipe by directly blowing with high-pressure gas or blowing and beating the surface of a sponge block to lead the surface of the zirconium alloy pipe to have no moisture and water print remnant to complete the process of reducing the fluorin residue on the acid cleaned surface of the zirconium alloy pipe. The invention can effectively reduce the fluorin residue which mainly is zirconium fluoride complex on the acid cleaned surface of the zirconium alloy pipe, improves the service life of the zirconium alloy pipe, sufficiently meet the use requirement of the zirconium alloy pipe in nuclear power, improves the manufacture technology of the zirconium alloy pipe in China, and enhances the use safety of nuclear materials.

Description

technical field [0001] The invention relates to the field of a process method for reducing fluorine residue on the pickling surface of a zirconium alloy tube. Background technique [0002] With the development of the nuclear power industry, people put forward requirements for reactor fuel assemblies with long life, high burnup, and zero damage, in order to reduce nuclear power production costs and improve operational safety, and promote the popularization and application of nuclear power. However, increasing the burnup of fuel elements and prolonging the fuel cycle period will increase the residence time of fuel elements in the stack, and the corrosion degree of fuel cladding materials will increase with the prolongation of the residence time in the stack. Therefore, the water side corrosion resistance of the zirconium alloy cladding becomes the focus of the problem. However, most zirconium alloy pipes require the surface of the product to be pickled. Pickling is carried ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/20C23G3/04B08B3/04B08B3/10B08B3/02
Inventor 袁改焕李小宁刘春光成亚辉于海慧李小影
Owner 国核宝钛锆业股份公司
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