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A kind of preparation method and application of zirconium alloy material with chromium coating

A zirconium alloy and chromium coating technology, which is applied in the field of nuclear reactor core structural material preparation, can solve the problems of impossibility, preparation of chromium coating, difficulty in the preparation of Cr-coated zirconium alloy fuel cladding, etc., and achieve long-dimension Effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the significant deficiency of these technologies includes: (1) economic benefit is low, it is difficult to meet the needs of industrialized large-scale production, that is, to prepare such a length and amount of Cr-coated zirconium alloy cladding tubes in a short time; (2) it is almost impossible to Preparation of Chromium Coating on the Inner Surface of Alloy Cladding
It can be seen that the existing preparation technology is difficult to meet the preparation of practical commercial Cr-coated zirconium alloy fuel cladding.

Method used

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  • A kind of preparation method and application of zirconium alloy material with chromium coating
  • A kind of preparation method and application of zirconium alloy material with chromium coating
  • A kind of preparation method and application of zirconium alloy material with chromium coating

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Effect test

Embodiment 1

[0041] Put the zirconium alloy in degreasing agent for degreasing. Sodium Alkyl Sulfate in Deionized Water. Then the zirconium alloy that has been deoiled is pickled, and the pickling solution used is a deionized aqueous solution containing 3% hydrofluoric acid and 50% concentrated nitric acid. Then, the acid-washed zirconium alloy was removed from the oxide film in an activation solution, which was 30 g / L ammonium bifluoride deionized aqueous solution, and 1 mL / L sulfuric acid was added to adjust the pH value.

[0042] Finally, the activated zirconium alloy is electroplated in an electroplating solution at 50° C., and the electroplating solution used is composed of main salt, complexing agent, pH buffer agent, conductive salt, surface additive and aqueous solution. Specifically as follows: the main salt is chromium sulfate, the concentration is 0.3mol / L, and the chromium ion is positive trivalent; the complexing agent is oxalic acid, and its concentration is 0.32mol / L; the p...

Embodiment 2

[0045] Put the zirconium alloy in degreasing agent for degreasing. Sodium Alkyl Sulfate in Deionized Water. Then the zirconium alloy that has been deoiled is pickled, and the pickling solution used is a deionized aqueous solution containing 3% hydrofluoric acid and 50% concentrated nitric acid. Then, the acid-washed zirconium alloy was removed from the oxide film in an activation solution, which was 30 g / L ammonium bifluoride deionized aqueous solution, and 1 mL / L sulfuric acid was added to adjust the pH value.

[0046] Finally, the activated zirconium alloy is electroplated in an electroplating solution at 35-55°C. The electroplating solution used is composed of main salt, complexing agent, pH buffer, conductive salt, surface additive and aqueous solution; the details are as follows: The main salt is chromium sulfate, the concentration is 0.3mol / L, and the chromium ion is positive trivalent; the complexing agent is oxalic acid, and the concentration is 0.32mol / L; the pH buff...

Embodiment 3

[0049] Put the zirconium alloy in a degreasing agent for degreasing, the degreasing agent is containing 50g / L sodium carbonate, 50g / L sodium phosphate, 10g / L sodium silicate, 10g / L sodium hydroxide and 1g / L dodecane Sodium sulfate in deionized water. Then the zirconium alloy that has been deoiled is pickled, and the pickling solution used is a deionized aqueous solution containing 5% hydrofluoric acid and 40% concentrated nitric acid. Then, the acid-washed zirconium alloy was removed from the oxide film in the activation solution, which was 20g / L ammonium bifluoride deionized aqueous solution, and 0.5mL / L sulfuric acid was added to adjust the pH value.

[0050] Finally, the activated zirconium alloy is electroplated in an electroplating solution at 45°C. The electroplating solution used is composed of main salt, complexing agent, pH buffer agent, conductive salt, surface additive and aqueous solution; the details are as follows: main salt It is chromium sulfate, the concentra...

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Abstract

The invention discloses a preparation method and application of a zirconium alloy material with a chromium coating. Firstly, it undergoes degreasing, pickling to remove the hardened layer on the surface, activation to remove the oxide film, etc., then or increases the nickel transition layer, and finally through controlled electroplating. Parameters Chromium coatings are prepared on the inner and outer surfaces of zirconium alloy sheets or tubes (especially for the manufacture of nuclear reactor fuel cladding tubes with high aspect ratios), which can meet the needs of long-dimension and large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of material preparation of nuclear reactor core structural parts, and in particular relates to a preparation method and application of a zirconium alloy material with a chromium coating. Background technique [0002] Due to its low thermal neutron absorption cross-section, good thermal conductivity, mechanical properties and radiation resistance, zirconium alloys have been and will continue to be widely used in water-cooled nuclear reactors, such as fuel cladding tubes, pressure tubes, The service conditions of brackets and tunnel pipes are very harsh. For example, the zirconium alloy used as the fuel cladding must not only withstand high temperature, high pressure, and corrosive aqueous solution, but also be irradiated by neutrons, fission products, α, β, γ and other high-energy particles. Oxidation corrosion under irradiation conditions is the main factor for the failure of zirconium fuel cladding, and it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/14C25D5/38C25D3/06
CPCC25D3/06C25D5/14C25D5/38
Inventor 冉广黄闽江李奕鹏