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Corrosion agent and corrosion method for displaying initial austenite grain boundary of medium and low carbon steel

A technology of austenite grain boundary and corrosive agent, which is applied in the field of metallographic sample preparation, can solve the problems of difficulty in clearly displaying initial austenite grains, etc., and achieves the effects of good display effect, simple preparation and corrosion mitigation effect.

Active Publication Date: 2021-06-04
SAIC GENERAL MOTORS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an etchant and corrosion method for displaying the initial austenite grain boundaries of medium and low carbon steels, so as to solve the problem that it is difficult to clearly display initial austenite grains in the corrosion of medium and low carbon steels

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  • Corrosion agent and corrosion method for displaying initial austenite grain boundary of medium and low carbon steel
  • Corrosion agent and corrosion method for displaying initial austenite grain boundary of medium and low carbon steel

Examples

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Embodiment 1

[0034] The raw materials of the etchant are: 100ml of distilled water; 6g of picric acid; 6g of fatty acid polyoxyethylene ether (FMEE 80% of Shandong Youso Chemical Technology Co., Ltd.).

[0035] The process of corrosive liquid configuration is:

[0036] 1) Take 100ml of distilled water; put it in a glass container, and place it in a water bath at 60°C;

[0037] 2) Add 6g of picric acid, stir with a glass rod, and after fully dissolving, there are still some undissolved particles at the bottom, forming a saturated aqueous solution of picric acid;

[0038] 3) Add 6g fatty acid polyoxyethylene ether and stir with a glass rod to fully dissolve it.

[0039] Then follow the steps below for sample preparation and corrosion:

[0040] 1) Cutting and inlaying: cutting the fully austenitized and quenched sample to prepare a square sample with a size of about 10mm x 10mm, and then inlaying.

[0041] 2) Grinding: Grind the inlaid samples with 200#, 600#, 1200# sandpaper in sequence, ...

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Abstract

The invention provides an etchant and a corrosion method for displaying initial austenite grain boundaries of medium and low carbon steels, and solves the problem that it is difficult to clearly display initial austenite grains for corrosion of medium and low carbon steels. The corrosive agent used to show the initial austenite grain boundary of medium and low carbon steel provided by the present invention includes water, picric acid and fatty acid polyoxyethylene ether; wherein, the consumption of fatty acid polyoxyethylene ether relative to every 100ml of water is 5-7g, The consumption of picric acid is as the criterion that can dissolve in described water and form picric acid saturated aqueous solution. The etchant of the invention uses fewer types of chemical reagents and is simple to prepare; the etching method is simple to operate; the display effect is better, and the etchant can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation in physical and chemical testing, in particular to a corrosive agent and a corrosion method for displaying initial austenite grain boundaries of medium and low carbon steels. Background technique [0002] The initial austenite grain size of the steel will directly affect the microstructure change in the process of controlled rolling and controlled cooling, thus having a great influence on the mechanical properties of the material. Therefore, it is of great significance to accurately display the initial austenite grains of steel. In addition, in the failure analysis, the initial austenite grains can reflect the structural state of the parts before quenching or normalizing heat treatment, which is helpful for engineers and technicians to judge whether there are structural defects such as coarse grains and mixed crystals in the parts. There are many methods to display auste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 刘鹏鹏魏一凡叶又李迎超
Owner SAIC GENERAL MOTORS