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Nickel-chromium alloy metallographic corrosion solution and corrosion method

A nickel-chromium alloy and corrosion solution technology, which is applied in the field of metallographic analysis of nickel-chromium alloys, can solve the problems of insignificant secondary corrosion effects, black grain boundaries and grains, and no visible metallographic structure, so as to avoid corrosion Insufficient and over-corrosion defects, grain contrast is obvious, and the effect of grain boundary lines is clear

Inactive Publication Date: 2015-04-15
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Corrosion of nickel-chromium alloy metallographic specimens is carried out according to the corrosion solution of nitric acid and water or nitric acid, hydrochloric acid and water according to a certain ratio. The first corrosion time is longer, and the second corrosion effect is not obvious, and no clear metallographic structure can be seen. , the grain boundaries between grains in the metallographic structure are not clear; if the ratio of nitric acid or nitric acid to hydrochloric acid is increased, over-corrosion is formed, the grain boundaries and grains appear black, and no clear metallographic structure can be observed

Method used

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  • Nickel-chromium alloy metallographic corrosion solution and corrosion method
  • Nickel-chromium alloy metallographic corrosion solution and corrosion method
  • Nickel-chromium alloy metallographic corrosion solution and corrosion method

Examples

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Embodiment 1

[0033] According to the volume ratio of concentrated nitric acid, concentrated hydrochloric acid, glacial acetic acid and water as 1:1:1:1, first add 50ml of water to the container, then add 50ml of concentrated nitric acid, 50ml of concentrated hydrochloric acid and 50ml of glacial acetic acid, stir and let stand 10 minutes, wherein the mass percent concentration of concentrated nitric acid was 65%, the mass percent concentration of concentrated hydrochloric acid was 36%, and the mass percent concentration of glacial acetic acid was 99.6%. Then take 2080 nickel-chromium alloy rods (the composition is shown in Table 1 below), and then use wire cutting to sample metallographic samples to make metallographic samples of 20mm*20mm*15mm, and use water sandpaper of different thicknesses for grinding , Such as 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1500 mesh, 2000 mesh water abrasive paper for grinding samples. The grinding and polishing quality of metallographic samples directly a...

Embodiment 2

[0039] According to the volume ratio of concentrated nitric acid, concentrated hydrochloric acid, glacial acetic acid and water as 1:1:1:1, first add 55ml of water to the container, then add 55ml of concentrated nitric acid, 55ml of concentrated hydrochloric acid and 55ml of glacial acetic acid, stir and let stand For 20 minutes, the mass percentage concentration of concentrated nitric acid was 68%, the mass percentage concentration of concentrated hydrochloric acid was 38%, and the mass percentage concentration of glacial acetic acid was 99.9%. The nickel-chromium alloy sample was taken for corrosion, and the depth of immersion of the corrosion solution into the sample was 2mm. , the corrosion time is 60 seconds, and then rinse the surface of the sample with distilled water or alcohol, and use a metallographic microscope for metallographic observation.

Embodiment 3

[0041] According to the volume ratio of concentrated nitric acid, concentrated hydrochloric acid, glacial acetic acid and water as 1:1:1:1, first add 50ml of water to the container, then add 50ml of concentrated nitric acid, 50ml of concentrated hydrochloric acid and 50ml of glacial acetic acid, stir and let stand For 15 minutes, the mass percentage concentration of concentrated nitric acid was 67%, the mass percentage concentration of concentrated hydrochloric acid was 37%, and the mass percentage concentration of glacial acetic acid was 99.8%. The nickel-chromium alloy sample was taken for corrosion, and the depth of immersion of the corrosion solution into the sample was 2mm. , the corrosion time is 5min, and then rinse the surface of the sample with distilled water or alcohol for 2.5min, and use a metallographic microscope for metallographic observation.

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Abstract

The invention relates to a nickel-chromium alloy metallographic corrosion solution and a corrosion method. The corrosion solution is a mixed solution of concentrated nitric acid, concentrated hydrochloric acid, glacial acetic acid and water in a volume ratio of 1:1:1:1. The concrete steps include: (1) preparing the corrosion solution, firstly adding water into a container, then adding concentrated nitric acid, concentrated hydrochloric acid and glacial acetic acid respectively, conducting stirring and then performing standing for 10-20min; (2) dripping the corrosion solution on the corrosion surface of a ground and polished nickel-chromium alloy metallographic sample, immersing the sample into the corrosion solution to a depth of 1-2mm, and controlling the corrosion time at 10s-10min; (3) flushing the sample surface with distilled water for more than 2min; and (4) flushing the sample surface with alcohol, and then wiping the sample surface with alcohol-carrying absorbent cotton. According to the invention, the corroded metallographic sample has obvious grain contrast and clear grain boundary line, and at the same time, the defects of under-corrosion and over-corrosion can be avoided. The corrosion solution can rapidly and efficiently corrode the metallographic structure of the sample.

Description

technical field [0001] The invention relates to the technical field of nickel-chromium alloy metallographic analysis, in particular to a nickel-chromium alloy metallographic corrosion solution and a corrosion method. Background technique [0002] Metallographic analysis is a routine inspection method to evaluate the quality of metal materials according to relevant standards and regulations. In metal rolling processing, metallographic analysis and metallographic structure observation play a very important role. Through the metallographic structure, the phase composition and grain size of each phase in the corroded alloy can be observed, as well as the slag inclusion and over-burning of non-metallic compounds. Or defects such as overheating. Metallographic analysis can also be used to judge whether the product production process is perfect, help to find the cause of product defects and optimize production process parameters through metallographic analysis. Therefore, met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 杨志强陈琴刘广龙王克震张海峰熊炜李琛
Owner JINCHUAN GROUP LIMITED
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