Metallographic etching method for uranium-zirconium alloy

A zirconium alloy and etching technology, applied in the field of metallographic corrosion of uranium-zirconium alloy, can solve the problems of environmental pollution and human injury, poor tissue display effect, low success rate, etc., to avoid injury and safety hazards, and to achieve good display effect. , the effect of simple formula

Inactive Publication Date: 2017-07-07
CHINA NORTH NUCLEAR FUEL
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Problems solved by technology

The metallographic etching method of uranium-zirconium alloy uses corrosive solution containing highly oxidizing chromic anhydride and irritating glacial acetic acid, which will cause environmental pollution and human injury

Method used

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Examples

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Example Embodiment

[0013] The present invention will be described in detail below in conjunction with specific embodiments.

[0014] The metallographic etching method of uranium-zirconium alloy of the present invention includes the following steps:

[0015] Cut 15mm×15mm×10mm uranium-zirconium alloy. During the cutting process, use a sufficient amount of coolant to avoid changes in the tissue due to overheating. 180#, 400#, 800#, 1500#, 2000#, 3000# metallographic water-based sandpaper, using water as lubricant, polished step by step, each polishing removes the previous wear mark, and the polishing time is 1-10min. Using water as lubricant, the surface of the sample to be observed is ground with 180# coarse sandpaper for 1 min; with 400# water sandpaper for 3 minutes; with 800# water sandpaper for 3 minutes; with 1500# water sandpaper for grinding Make it for 5 minutes; use 2000# water sandpaper for 5 minutes; use 3000# water sandpaper for 5 minutes. Use 1.0μm diamond paste for mechanical polishing...

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Abstract

The invention belongs to the technical field of metallographic etching of uranium-zirconium alloy and particularly relates to a metallographic etching method for the uranium-zirconium alloy. The method includes: cutting the uranium-zirconium alloy; gradually polishing with 180#, 400#, 800#, 1500#, 2000# and 3000# metallographic waterproof abrasive paper, wherein each polishing removes one polishing scratch, and polishing time is 1-10 minutes; using water as the lubricating agent to perform mechanical polishing; using a 1-50% phosphoric acid aqueous solution to perform electrolytic etching, wherein electrolytic etching voltage is 2-5V, and electrolytic etching time is 2-10 seconds. The metallographic etching method has the advantages that a structure metallographic sample applicable to metallographic observation is prepared by mechanically grinding and polishing a uranium-zirconium alloy sample and using the phosphoric acid aqueous solution to perform electrolytic etching; provided electrolytic etching liquid is simple in formula, good in alloy structure display effect and capable of avoiding human body damage and potential safety hazard caused by the using of high-oxidability chromic anhydride.

Description

technical field [0001] The invention belongs to the technical field of metallographic corrosion of uranium-zirconium alloys, and in particular relates to a metallographic etching method of uranium-zirconium alloys. Background technique [0002] The internal structure of metal materials determines the properties of materials, and metallography is the most direct and effective method for studying the internal structure of materials. The observation of the metallographic structure needs to etch out the internal structure of the metal material. The metallographic etching method of uranium-zirconium alloy uses corrosive solution containing highly oxidizing chromic anhydride and irritating glacial acetic acid, which will cause environmental pollution and human injury, and there is a major safety hazard; using highly oxidizing, corrosive Sulfuric acid and nitric acid etching solutions have a low success rate, poor tissue display, and unsatisfactory corrosion effects. Contents of...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/28
CPCG01N1/32G01N1/286G01N2001/2866
Inventor 贺进明高一鸣齐建波池春霞
Owner CHINA NORTH NUCLEAR FUEL
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