Metallurgical analysis etching method of layered metal composite material

A composite material, metallographic analysis technology, applied in the field of metallographic corrosion of metal materials, can solve the problem of difficult to simultaneously display the metallographic microstructure, microstructure mechanics and corrosion resistance differences and other problems

Inactive Publication Date: 2016-05-25
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the obvious differences in the microstructure, mechanics and corrosion resistance of the metal material components of each layer in the layered metal composite material, it is difficult to simultaneously display the metallographic microstructure of each layer of metal during the detection and analysis process.

Method used

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  • Metallurgical analysis etching method of layered metal composite material
  • Metallurgical analysis etching method of layered metal composite material
  • Metallurgical analysis etching method of layered metal composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: 304 stainless steel / 10# steel layered metal composite material

[0021] Sample preparation: The surface of the sample is processed by wire cutting, turning, milling, etc., then mechanically ground, and then mechanically polished until the surface is smooth and free of scratches;

[0022] Electrolytic corrosion: Place the mechanically polished sample in 10wt% chromium trioxide-ethanol solution, connect the corresponding electrodes, and perform electrolytic corrosion. During the corrosion, use 2.5V voltage, and the corrosion time is 15s. After corrosion, use water and absolute ethanol in sequence After cleaning and drying, the microstructure of the 304 stainless steel layer can be displayed;

[0023] Chemical corrosion: chemically corrode the electrolytically corroded, washed and dried samples with 4wt% nitric acid-ethanol solution for 10s, and then wash with water and absolute ethanol and dry them in turn. At this time, the 10# steel layer can be The microstr...

Embodiment 2

[0024] Example 2: 304 stainless steel / 20G steel layered metal composite material

[0025] Sample preparation: The surface of the sample is processed by wire cutting, turning, milling, etc., then mechanically ground, and then mechanically polished until the surface is smooth and free of scratches;

[0026] Electrolytic corrosion: Place the mechanically polished sample in 10wt% chromium trioxide-ethanol solution, connect the corresponding electrodes, and perform electrolytic corrosion. During the corrosion, use 2.5V voltage, and the corrosion time is 10s. After corrosion, use water and absolute ethanol in sequence After cleaning and drying, the microstructure of the 304 stainless steel layer can be displayed;

[0027] Chemical corrosion: Chemically corrode the electrolytically corroded, washed and dried samples with 8wt% nitric acid-ethanol solution for 20s. Microorganisms are shown, see figure 1 .

Embodiment 3

[0028] Example 3: 316 steel / 20G steel layered metal composite

[0029] Sample preparation: The surface of the sample is processed by wire cutting, turning, milling, etc., then mechanically ground, and then mechanically polished until the surface is smooth and free of scratches;

[0030] Electrolytic corrosion: place the mechanically polished sample in 10wt% chromium trioxide-ethanol solution, connect the corresponding electrodes, and conduct electrolytic corrosion. During the corrosion, use 3V voltage, and the corrosion time is 60s. After corrosion, clean it with water and absolute ethanol in sequence And blow dry, at this time the microstructure of the 316 stainless steel layer can be displayed;

[0031] Chemical corrosion: Chemically corrode the electrolytically corroded, washed and dried samples with 8wt% nitric acid-ethanol solution for 20s. Microtissues are revealed.

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Abstract

The invention belongs to the technical field of metal material metallographic etching, and particularly relates to a metallurgical analysis etching method of layered metal composite material. The metallurgical analysis etching method employs electrolytic etching and chemical etching methods in order; and the microstructures of alloy components with different corrosion resistant performances in the layered metal composite material are displayed simultaneously, so as to analyze the phase composition, microstructure morphology, interface structure and grain size of components in each layer of the layered composite material.

Description

technical field [0001] The invention belongs to the technical field of metallographic corrosion of metal materials, in particular to a method for metallographic analysis and corrosion of layered metal composite materials. Background technique [0002] With the continuous development of science and technology and the emergence of various emerging technologies and industries, the requirements for material performance are getting higher and higher, and the performance of a single component material is difficult to meet these requirements. In recent decades, the production, development and application of layered metal composites have attracted more and more attention from the scientific and technological circles. Layered metal composite materials are composed of several layers of metals with different properties. Compared with single-element alloy materials, the materials after reasonable design and combination can obtain relatively high strength, corrosion resistance, electrica...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 郭青苗解国良
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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