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A kind of electrolytic polishing solution for preparing aluminum alloy metallographic sample and its structure display method

An electrolytic polishing and metallographic sample technology, which is applied in the field of metallographic structure display, can solve the problems of safety hazards, metallographic sample phase shedding, etc., and achieve the effects of high safety, easy operation, and high sample preparation efficiency

Active Publication Date: 2020-12-11
HARBIN WELDING INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used electrolytic polishing solution for aluminum alloy metallographic samples is a mixed reagent of perchloric acid and ethanol, but because perchloric acid and ethanol may explode when mixed, there is a great potential safety hazard. The metallographic test prepared at the same time phase shedding

Method used

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  • A kind of electrolytic polishing solution for preparing aluminum alloy metallographic sample and its structure display method
  • A kind of electrolytic polishing solution for preparing aluminum alloy metallographic sample and its structure display method
  • A kind of electrolytic polishing solution for preparing aluminum alloy metallographic sample and its structure display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare an electrolytic polishing solution for aluminum alloy metallographic samples, which consists of 42 mL of glycerol and 8 mL of hydrochloric acid with a mass fraction of 23%.

[0049] The structure display method of the 2-series aluminum alloy sample made of 2219:

[0050] (1) Use 220-mesh water sandpaper and 800-mesh water sandpaper to grind the sample surface of the 2-series aluminum alloy sample of 2219 in sequence, use 1000-mesh metallographic sandpaper, 3000-mesh metallographic sandpaper and 7000-mesh metallographic sandpaper to sequentially grind 2219 The sample surface of the 2-series aluminum alloy sample was ground, and after mechanical grinding, the surface roughness Ra of the 2219 2-series aluminum alloy sample was 3 μm.

[0051] (2) Use woolen cloth and a diamond polishing agent with a particle size of 2.5 μm to mechanically polish the 2-series aluminum alloy sample surface of 2219 after mechanical grinding, to ensure that the 2-series aluminum alloy s...

Embodiment 2

[0054] An electrolytic polishing solution for preparing an aluminum alloy metallographic sample, consisting of 43 mL of glycerol and 7.5 mL of hydrochloric acid with a mass fraction of 30%;

[0055] In this embodiment, the structure display method of a 5-series aluminum alloy sample whose material is 5083 is adopted:

[0056] (1) Use 220-mesh water sandpaper and 800-mesh water sandpaper to grind the sample preparation surface of the 5 series aluminum alloy sample of 5083 sequentially, use 1000-mesh metallographic sandpaper, 3000-mesh metallographic sandpaper and 7000-mesh metallographic sandpaper to sequentially grind 5083 The 5-series aluminum alloy sample was ground, and after mechanical grinding, the surface roughness Ra of the sample surface of the 5083 5-series aluminum alloy sample was 5 μm.

[0057] (2) Use woolen cloth and a diamond polishing agent with a particle size of 2.5 μm to mechanically polish the sample preparation surface of the 5 series aluminum alloy sample...

Embodiment 3

[0060] An electrolytic polishing solution for preparing an aluminum alloy metallographic sample, consisting of 42 mL of glycerol and 8 mL of hydrochloric acid with a mass fraction of 27%;

[0061] The structure display method of the 6-series aluminum alloy sample whose material is 6082:

[0062] (1) Use 220-mesh water sandpaper and 800-mesh water sandpaper to grind the 6 series aluminum alloy sample preparation surface of 6082 sequentially, use 1000-mesh metallographic sandpaper, 3000-mesh metallographic sandpaper and 7000-mesh metallographic sandpaper to successively grind 6082 The surface of the 6-series aluminum alloy sample was ground, and after mechanical grinding, the surface roughness Ra of the 6-series aluminum alloy sample surface of 6082 was 3 μm.

[0063] (2) Use woolen cloth and a diamond polishing agent with a particle size of 2.5 μm to mechanically polish the surface of the 6-series aluminum alloy trial sample of 6082 after mechanical grinding, to ensure that aft...

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Abstract

The invention provides an electrolytic polishing solution for preparing an aluminum alloy metallographic specimen. The electrolytic polishing solution comprises glycerol and a hydrochloric acid aqueous solution. According to the invention, a combination mode of glycerol and a hydrochloric acid aqueous solution is adopted, hydrochloric acid provides Cl<-> and an acidic environment for electrolyticpolishing, glycerol serves as a reactant to participate in an electrolytic reaction, and meanwhile, water can also improve the conductivity of the electrolytic polishing solution. The electrolytic polishing solution provided by the invention is low in hydrochloric acid content and free of explosion danger, and after the aluminum alloy specimen is polished by the electrolytic polishing solution, the obtained metallographic structure has the excellent properties of clear and accurate imaging of each phase and less falling of the second phase, and the metallographic detection requirements can bebetter met. Moreover, the structure display method of the aluminum alloy metallographic specimen is easy and convenient to operate, heating is not needed, and the sample preparation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure display, and in particular relates to an electrolytic polishing solution for preparing aluminum alloy metallographic samples and a method for displaying the structure thereof. Background technique [0002] Due to their excellent performance, aluminum and its alloys have been widely used in various fields such as the automobile industry and aerospace, and play an important role in the development of the national economy. As metallographic testing is an important means of aluminum alloy performance analysis, the quality of its sample preparation is particularly important. The common methods of metallographic sample preparation are mechanical polishing and electrolytic polishing. [0003] A single mechanical polishing is not only time-consuming and labor-intensive, but also easily leaves scratches and smears due to the softness of the aluminum alloy, which interferes with tissue obs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/20G01N1/32
CPCC25F3/20G01N1/32
Inventor 马一鸣储继君徐锴吕晓春安洪亮靳彤李苏珊王博郝龙宇
Owner HARBIN WELDING INST LTD