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Metallographic corrosive for deformed tin bronze and crystal grain display method thereof

A display method, tin bronze technology, applied in the preparation of test samples, instruments, analysis materials, etc., can solve the problem of inability to clearly distinguish the grain size and shape, excessive corrosion on the surface of the sample, and affect the accuracy of metallographic structure evaluation Sex and other issues to achieve the effect of avoiding drag marks, avoiding excessive corrosion, and controlling corrosion time

Pending Publication Date: 2022-07-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for tin bronze after cold deformation processing, the corrosion ability of this metallographic etchant is too strong, which often causes excessive corrosion on the surface of the sample, and only a large number of dendrites can be observed, but the grain size and shape cannot be clearly distinguished. This will seriously affect the accuracy of metallographic structure evaluation

Method used

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  • Metallographic corrosive for deformed tin bronze and crystal grain display method thereof
  • Metallographic corrosive for deformed tin bronze and crystal grain display method thereof
  • Metallographic corrosive for deformed tin bronze and crystal grain display method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step (1), by rolling, rolling a tin bronze plate with a grade of SCu5210 and an initial thickness of 1mm into a tin bronze plate with a thickness of 0.8mm, and the rolling deformation is 20%;

[0042] Step (2), cut a sample of 10mm×10mm on the tin bronze plate with the above-mentioned 20% rolling deformation;

[0043] Step (3), using 80 mesh, 400 mesh, 800 mesh, and 1500 mesh sandpaper on the metallographic pre-grinder to polish the above-mentioned sample, until the surface of the sample is smooth and smooth and the scratch direction is consistent;

[0044] Step (4), spray the diamond polishing agent of 1.5 μm on the black velvet cloth, control the rotating speed of the polishing machine to be 500 rpm, and polish the above-mentioned polished sample;

[0045] Step (5), rinse and dry with water and dehydrated alcohol successively after polishing;

[0046] Step (6), take 0.5mL of the metallographic etchant with a plastic tip dropper, drop it on the surface of the sample, ...

Embodiment 2

[0049] Step (1), by rolling, rolling a tin bronze plate with a grade of SCu5210 and an initial thickness of 1mm into a tin bronze plate with a thickness of 0.6mm, and the rolling deformation is 40%;

[0050] Step (2), cut a sample of 10mm×10mm on the tin bronze plate with the above-mentioned 40% rolling deformation;

[0051] Step (3), using 80 mesh, 400 mesh, 800 mesh, and 1500 mesh sandpaper on the metallographic pre-grinder to polish the above-mentioned sample, until the surface of the sample is smooth and smooth and the scratch direction is consistent;

[0052] Step (4), spray the diamond polishing agent of 1.5 μm on the black velvet cloth, control the rotating speed of the polishing machine to be 500 rpm, and polish the above-mentioned polished sample;

[0053] Step (5), rinse and dry with water and dehydrated alcohol successively after polishing;

[0054] Step (6), take 0.5mL of the metallographic etchant with a plastic tip dropper, drop it on the surface of the sample, wa...

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Abstract

The invention discloses a metallographic corrosive agent for deformed tin bronze and a crystal grain display method of the metallographic corrosive agent. Belongs to the technical field of metallographic preparation, and is prepared from the following components in percentage by volume: 18-24% of concentrated nitric acid, 46-52% of glacial acetic acid and the balance of absolute ethyl alcohol, and the crystal grain display method comprises the following operation steps: polishing a prepared deformed tin bronze sample until the surface is smooth and flat and the directions of scratches are consistent, polishing by using a diamond polishing agent of 1.5-2.5 microns, and controlling the rotating speed to be 400-600rpm; washing with water and absolute ethyl alcohol in sequence, and blow-drying; sucking the metallographic corrosive agent by using a rubber head dropper, dripping the metallographic corrosive agent on the surface of the polished sample, standing for 10-20 seconds, cleaning and drying; and observing the microscopic structure of the sample under a metallographic microscope, and photographing and recording. According to the deformed tin bronze metallographic specimen prepared through the method, the grain boundary and the grain internal structure are clear and visible, the corrosion process is easy to control, and the microstructure of the deformed tin bronze can be regulated and controlled in production practice.

Description

technical field [0001] The invention belongs to the technical field of metallographic preparation, and relates to a metallographic etchant for deformed tin bronze and a crystal grain display method thereof. Background technique [0002] Tin bronze is a copper alloy with tin as the main alloying element. Phosphorus, zinc, lead and other alloying elements can be added to form tin phosphor bronze, tin zinc bronze and tin lead bronze. The addition of a small amount of phosphorus (≤0.45%) can improve the casting characteristics of tin bronze, improve the fluidity, and improve the strength, hardness, elastic limit, elastic modulus, fatigue strength and wear resistance of the alloy. At present, tin bronze is widely used in highly wear-resistant structural components such as sliding bearings, bearing bushes, guide rails, and rocker arms. As a bearing material, tin bronze usually needs to be composited with steel plates by means of arc deposition, laser cladding, plasma spraying, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/18G01N1/32G01N21/84
CPCC23F1/18G01N1/32G01N21/84
Inventor 周健董樑芮云鹏王赞薛烽白晶
Owner SOUTHEAST UNIV
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