Ultra-low carbon steel metallographic corrosive agent and display method of metallographic structure

A technology of ultra-low carbon steel and corrosive agent, which is applied in the preparation of test samples, measuring devices, and material analysis by optical means, etc., can solve the problems of difficult corrosion, high production cost, poor operation controllability, etc. Simple, easy to operate, and the effect of short corrosion time

Pending Publication Date: 2022-01-28
唐山瑞丰钢铁(集团)有限公司
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Problems solved by technology

[0005] The invention aims to solve the problems of difficult corrosion, poor operation controllability, long test time, high production cost and difficult storage of chemicals in the existing technology in the metallographic detection process of ultra-low carbon steel. Display method of phase etchant and metallographic structure

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  • Ultra-low carbon steel metallographic corrosive agent and display method of metallographic structure

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Embodiment Construction

[0013] In order to fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0014] A metallographic etchant for ultra-low carbon steel provided by the invention is formed by mixing dehydrated alcohol, nitric acid and glacial acetic acid, the volume content of dehydrated alcohol accounts for 90%, the volume content of nitric acid accounts for 5%, and the remainder is glacial acetic acid, wherein, The mass percentage concentration of absolute ethanol is 99.5%, the mass percentage concentration of nitric acid is 65-68%, and the mass percentage concentration of glacial acetic acid is 99.5%. The corrosive agent provided by the present invention is obtained by mixing the three substances evenly.

[0015] The method of displaying the metallographic structure of ultra-low carbon steel is a one-step corrosion method, which...

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Abstract

The invention discloses a preparation method of an ultra-low carbon steel metallographic corrosive agent and a display method of a metallographic structure, and relates to the technical field of metallographic preparation. The corrosive agent is composed of 90% by volume of absolute ethyl alcohol, 5% by volume of nitric acid and the balance of glacial acetic acid, and can be obtained after the substances are evenly mixed. The display method of the metallographic structure is a one-step corrosion method and comprises the following steps: firstly, blow-drying water stains on the surface of an ultra-low carbon steel sample subjected to fine polishing, then directly eroding the ultra-low carbon steel sample for 50 seconds by using a corrosive agent at normal temperature, rinsing the surface of the sample by using clear water, blow-drying the sample, and observing the metallographic structure. The metallographic corrosive agent provided by the invention is short in corrosion time, simple in corrosion step and convenient to operate, can enable the grain boundary of grains in ultra-low carbon steel to be clear, and is beneficial to the measurement of the grain size.

Description

technical field [0001] The invention relates to the technical field of metallographic preparation, in particular to a method for preparing an ultra-low carbon steel metallographic etchant and displaying a metallographic structure. Background technique [0002] Ultra-low carbon steel is a kind of interstitial-free steel with excellent deep drawing performance, and is widely used in automobile and home appliance industries. Since the ultra-low carbon steel is relatively pure, the metallographic structure is a pure ferrite structure, and there are no residual interstitial atoms at the grain boundaries, so the iron obtained by ultra-low carbon steel corrosion with a low-carbon ferritic steel metallographic etchant nitric acid alcohol solution The grain boundary of the element body is blurred, such as figure 1 As shown, thus causing great difficulties for metallographic analysis. [0003] Patent CN102890027A discloses a method for displaying the metallographic structure of a Ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/34G01N21/84
CPCG01N1/28G01N1/32G01N1/34G01N21/84
Inventor 张铭志高梅张晓蒙董鹏赵英东杜艳波袁振桓
Owner 唐山瑞丰钢铁(集团)有限公司
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