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Observation method for industrial pure zirconium microstructure

A metallographic structure, industrially pure technology, applied in the observation field of industrial pure zirconium metallographic structure, can solve the problems of misjudgment, unclear metallographic structure, difficult to obtain clear structure, etc., and achieve the effect of easy operation

Inactive Publication Date: 2015-11-25
WESTERN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively solve the problem that the existing commercially pure zirconium R60702 metallographic sample is difficult to obtain a clear structure, and avoids the shortcomings of unclear observed metallographic structure and easy judgment errors due to improper polishing and corrosion

Method used

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  • Observation method for industrial pure zirconium microstructure
  • Observation method for industrial pure zirconium microstructure
  • Observation method for industrial pure zirconium microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The observation method of the present embodiment comprises the following steps:

[0031] Step 1. Machining a metallographic observation plane on the surface of an industrially pure zirconium R60702 bar with a specification of Φ8mm, and then grinding the machined metallographic observation plane on a metallographic grinder. 150#, 700# and 1000# metallographic water sandpaper are ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated. After grinding, the metallographic observation plane is washed away. grit;

[0032] Step 2, immerse the metallographic observation plane of sand grains washed out in step 1 into the chemical polishing solution and polish for 5s; the chemical polishing solution is made of H 2 o 2 、HNO 3 and HF are mixed according to the volume ratio of 2:2:1; the H 2 o 2 、HNO 3 and HF are analytical reagents;

[0033] Step 3...

Embodiment 2

[0038] The observation method of the present embodiment comprises the following steps:

[0039] Step 1. Machining a metallographic observation plane on the surface of an industrially pure zirconium R60702 bar with a specification of Φ25mm, and then grinding the machined metallographic observation plane on a metallographic grinder. 150#, 700# and 1000# metallographic water sandpaper are ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated. After grinding, the metallographic observation plane is washed away. grit;

[0040] Step 2, immerse the metallographic observation plane that washes off the grit in step 1 in the chemical polishing solution and polish for 15s; the chemical polishing solution is made of H 2 o 2 、HNO 3 It is mixed with HF according to the volume ratio of 5:5:2; the H 2 o 2 、HNO 3 and HF are analytical reagents;

[0041] Step...

Embodiment 3

[0046] The observation method of the present embodiment comprises the following steps:

[0047] Step 1. Machining a metallographic observation plane on the surface of an industrially pure zirconium R60702 bar with a specification of Φ16mm, and then grinding the machined metallographic observation plane on a metallographic grinder. 150#, 700# and 1000# metallographic water sandpaper are ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated. After grinding, the metallographic observation plane is washed away. grit;

[0048] Step 2, immerse the metallographic observation plane that washes off the grit in step 1 in the chemical polishing solution and polish for 10s; the chemical polishing solution is made of H 2 o 2 、HNO 3 It is mixed with HF according to the volume ratio of 3:3:1; the H 2 o 2 、HNO 3 and HF are analytical reagents;

[0049] Step...

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Abstract

The invention discloses an observation method for industrial pure zirconium microstructure. The method comprises: step 1, mechanically processing industrial pure zirconium R60702 surface to obtain a metallographic observation plane, grinding, and flushing off sand grains on the metallographic observation plane; step 2, dipping the metallographic observation plane on which sand grains are flushed off into a chemical polishing solution for polishing; step 3, dipping the polished metallographic observation plane into a corrosion solution for erosion; step 4, taking the eroded metallographic observation plane as an anode, a stainless steel plate as a cathode and a sulfuric acid solution as an electrolyte, and performing anodic oxidation treatment on the metallographic observation plane under a room-temperature condition; and step 5, putting the metallographic observation plane subjected to anodic oxidation treatment under a metallographic microscope, and employing a polarized-light observation manner to observe the microstructure. The method is capable of effectively solving the problem that a clear structure is extremely difficult to obtain from a conventional industrial pure zirconium metallographic sample, and avoids the disadvantages that the microstructure is not clear because of improper polishing and corrosion and determination fault is easily generated.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure observation of metal materials, and in particular relates to a method for observing the metallographic structure of industrial pure zirconium. Background technique [0002] R60702 is more and more used in the chemical industry due to its excellent corrosion resistance in acids, alkalis and salts, and has become an important material for key parts of chemical equipment, especially in the acetic acid industry. In order to study the performance of R60702, it is necessary to observe its microstructure to determine the type of organization and its uniformity, so as to help improve the performance of R60702. When using the observation method in the prior art to observe the metallographic structure of R60702, it is difficult to obtain a clear microstructure due to the processing method of the metallographic observation plane and the problem of erosion. For example, it is difficult to pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/32
Inventor 何伟马红征杨军红武晶晶石科学杜小平
Owner WESTERN METAL MATERIAL
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