Color metallography coloring method of aluminum alloy

A color metallographic and aluminum alloy technology, applied in the preparation of test samples, etc., can solve problems such as poor effect, insufficient etching at grain boundaries, weak corrosion of sodium hydroxide, etc., and achieve simple steps and clear microstructure , good coloring effect

Inactive Publication Date: 2013-12-25
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Keller reagent (95 mL water, 2.5 mL HNO3, 1.5 mL HCI, 1.0 mL HF:) and similar reagents (HF, HNO 3 Mixed acid solution with HCL) can show the grain boundaries of some aluminum alloys in the metallographic preparation of aluminum alloys, but the effect is not ideal
However, when using Weck reagent to color some deformed aluminum alloys, the effect is not good.
Analyzing the reason, it may be that a small amount of sodium hydroxide contained in Weck's reagent is weak in corrosion, and it is not enough to etch the grain boundary, so it is difficult to see a clear structure

Method used

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  • Color metallography coloring method of aluminum alloy
  • Color metallography coloring method of aluminum alloy
  • Color metallography coloring method of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Pre-etching: Immerse the A6N01 deformed aluminum alloy metallographic sample in an etching solution at 70°C for 1 to 2 minutes. After the etching is completed, rinse it with running water, clean it with anhydrous ethanol, and dry it with hot air; the etching solution is The solution obtained by dissolving potassium chloride in phosphoric acid and distilled water, the ratio is 1g potassium chloride: 21mL phosphoric acid: 29mL distilled water; the mass fraction of phosphoric acid is 85%;

[0038] (2) Coloring: Immerse the aluminum alloy metallographic sample after the pre-etching treatment in step (1) in Weck reagent for 10 to 20 seconds. After the surface is colored, rinse with running water, clean with absolute ethanol, and dry with hot air;

[0039] The ratio relationship of each substance in the Weck reagent is: 100 mL of distilled water: 4 g of potassium permanganate: 1 g of sodium hydroxide.

[0040] After coloring by the method of Example 1, a clear grain struc...

Embodiment 2

[0043] (1) Pre-etching: Immerse the A7N01 aluminum alloy metallographic sample in an etching solution at 70 °C for 1 to 2 minutes. After the etching is completed, rinse it with running water, clean it with anhydrous ethanol, and dry it with hot air; The volume ratio of the substance is: 20 phosphoric acid: 9 nitric acid: 40 distilled water; the mass fraction of phosphoric acid is 85%, and the mass fraction of nitric acid is 65%;

[0044] (2) Coloring: Immerse the aluminum alloy metallographic sample after the pre-etching treatment in step (1) in Weck reagent for 5-8 seconds. After the surface is colored, rinse with running water, rinse with absolute ethanol, and dry with hot air;

[0045] The ratio relationship of each substance in the Weck reagent is: 100 mL of distilled water: 4 g of potassium permanganate: 1 g of sodium hydroxide.

[0046] Depend on Figure 4 It can be seen that the grain boundary is partially corroded, but it is not clear enough, and from Figure 5 It ca...

Embodiment 3

[0048] (1) Pre-etching: Immerse the A6N01 deformed aluminum alloy metallographic sample in an etching solution at 73 °C for 1 to 2 minutes. After the etching is completed, rinse it with running water, clean it with anhydrous ethanol, and dry it with hot air; The ratio is 1g potassium chloride: 21mL phosphoric acid: 29mL distilled water; the mass fraction of phosphoric acid is 85%;

[0049] (2) Coloring: Immerse the aluminum alloy metallographic sample after the pre-etching treatment in step (1) in Weck reagent for 10 to 20 seconds. After the surface is colored, rinse with running water, clean with absolute ethanol, and dry with hot air;

[0050] The ratio relationship of each substance in the Weck reagent is: 100 mL of distilled water: 4 g of potassium permanganate: 1 g of sodium hydroxide.

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Abstract

The invention discloses a color metallography coloring method of an aluminum alloy. The color metallography coloring method comprises the following steps of (1) pre-etching, namely immersing a polished aluminum alloy metallographic specimen in an etching liquid for 1-10 minutes, after ending etching, washing with running water, cleaning with ethyl alcohol, and drying, wherein the etching liquid is a solution obtained by dissolving potassium chloride or sodium chloride in phosphoric acid or a solution prepared by phosphoric acid, nitric acid and water; and (2) coloring. The color metallography coloring method has the advantages that steps are simple, the coloring effect is good, and a clear grain structure can be obtained, namely, the clear microstructure can be obtained without adopting polarized light and sensitive hue for observation.

Description

technical field [0001] The invention relates to a color metallographic coloring method for aluminum alloys, and belongs to the technical field of metal material plating. Background technique [0002] The study of the microstructure of metals and alloys is of great significance to deeply understand the relationship between the composition, structure and properties of metals and alloys. Among the various techniques for revealing the internal structure of metals, optical metallography is the earliest and most widely used, and the most widely used metallographic technique is black and white metallography. Color metallography mainly uses the thin film interference phenomenon of light through special methods to make the structure of metal or alloy show different colors. Compared with black and white metallography, color metallography has many advantages, such as high discrimination, and thin film interference of light is very sensitive to component segregation, grain orientation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/30G01N1/32
Inventor 梁志敏赵双双汪殿龙
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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