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Preparation method of aluminum steel composite grain structure, sample, reagent and preparation method

A composite material and grain technology, which is applied in the preparation of test samples and other directions, can solve the problems of difficult to observe the grain arrangement of the aluminum-steel composite interface, violent reaction, serious surface oxidation, etc., and achieve convenient and efficient observation and measurement. Effect

Active Publication Date: 2016-06-01
YINBANG CLAD MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this method is used to coat aluminum-steel composite materials, since the anode current mainly flows through the surface of the steel side, the coating effect of the aluminum layer is poor. At the same time, the steel side reacts violently, the surface is severely oxidized, and pitting pits with a diameter of millimeters are generated. It is difficult to display the grain structure on the steel side after coating
[0006] To sum up, it is currently difficult for the industry to simultaneously observe the grain arrangement on both sides of the aluminum-steel composite interface

Method used

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  • Preparation method of aluminum steel composite grain structure, sample, reagent and preparation method
  • Preparation method of aluminum steel composite grain structure, sample, reagent and preparation method
  • Preparation method of aluminum steel composite grain structure, sample, reagent and preparation method

Examples

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no. 1 example

[0042] This embodiment takes the annealed aluminum (1XXX series)-steel (carbon structural steel) composite material for the base pipe of the air-cooling system of a thermal power station as an example to illustrate the technical solution of the present invention.

[0043] Prepare aluminum-steel composite specimens. The sample can be prepared by itself, and the preparation method is as follows:

[0044]The 4A60 / 08Al aluminum-steel composite plate used for the base pipe of the air-cooling system of the thermal power station is cut into a composite material sample with a length and width of 30mm, and then the composite material sample is passed through 320#, 600#, and 1200# water-resistant sandpaper in order from coarse to Finely ground and mechanically polished, cleaned with alcohol and dried such as blow-drying before use. When grinding, the surface of the sample needs to be rinsed with cooling water continuously, especially when grinding with 1200# sandpaper, before the basic...

no. 2 example

[0071] According to the method in the first embodiment of the present invention, the second embodiment also carried out the same test on the Al-0.8Si-0.08Zr / 08Al aluminum-steel composite material to prepare the grain structure, and the prepared aluminum-steel composite material The enlarged view of the grain structure is shown in figure 2 shown.

[0072] from figure 2 It can be seen that the metallographic structure is divided into two parts by a clear boundary, one side is the grain structure of the aluminum side of the aluminum-steel composite material sample, and the other side is the grain structure of the steel side of the aluminum-steel composite material.

no. 3 example

[0074] In the step of preparing the grain structure, if step S20 is missing, that is, the composite material sample after electrolysis is not cleaned with sodium hydroxide solution, and the sample is directly wiped with nital in step S3, the aluminum side is easy to blacken, and the grain boundaries are not clear.

[0075] In the third embodiment of the present invention, the magnified view of the grain structure prepared by step S3 directly after the electrolysis of the 1060 / 08Al aluminum-steel composite material is as follows: image 3 shown.

[0076] from image 3 It can be seen that the aluminum side and the steel side of the metallographic structure obtained at the same time are not easy to identify, and the boundary is not obvious.

[0077] And after adopting step S20 after electrolysis and adopting step S3 again, the grain structure enlarged picture of the sample preparation of same material is as follows Figure 4 shown.

[0078] from Figure 4 It can be seen that...

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Abstract

The invention relates to a preparation method of an aluminum steel composite grain structure, a sample, a reagent and a preparation method. The preparation method of the grain structure comprises the steps that an aluminum steel composite sample is prepared; an aluminum side grain structure is prepared, wherein the composite sample is subjected to electrolysis for 1-3 min at constant potential (-1.0 V)-(-0.7 V) in 0.5%-2.5% parts by weight of hydrofluoric acid aqueous solution electrolytic solution at the temperature ranging from 50 DEG C to 70 DEG C; a steel side grain structure is prepared, wherein the composite sample subjected to electrolysis is wiped and cleaned for 30-60 s with a room-temperature nitric acid ethanol solution containing 1.0%-2.5% parts by weight of nitric acid; the aluminum steel composite sample is prepared through grinding through 200-400#, 500-700# and 1,000-1,400# waterproof abrasive paper in sequence and polishing. According to the technical scheme, the grain structures of the two sides of the aluminum steel composite can be displayed simultaneously, and observation and measurement of a composite metallographic structure are more convenient, rapid and efficient.

Description

technical field [0001] The invention mainly relates to the preparation of the grain structure of the aluminum-steel composite material, in particular to a preparation method, a sample, a reagent and a preparation method of the grain structure of the aluminum-steel composite material. Background technique [0002] Aluminum-steel layered composite material combines the advantages of aluminum's excellent thermal conductivity and steel's high strength. Aluminum-steel composite material is the main raw material for the base pipe of the air-cooling system of thermal power stations. The power station air-cooling system made of aluminum-steel composite materials can save a lot of water resources and has significant economic and social benefits. Therefore, aluminum-steel composite materials have become one of the metal layered structure composite materials that my country's "Twelfth Five-Year Plan" focuses on. The domestic development and application of this material is in its infanc...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N1/34
CPCG01N1/28G01N1/32G01N1/34
Inventor 杨振明刘维李龙周德敬
Owner YINBANG CLAD MATERIAL
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