Corrosive agent for displaying silicon steel coagulation tissue and its preparation method

Abstract

The invention provides a corrosive for the revealing of the silicon steel solidification structure. The invention has the component and blending ratio of the corrosive that 0.9 to 1.2 gram of a picronitric acid and / or 0.9 to 1.2 gram of a stannous acid, 10 to 20 gram of a ferric chloride, 20 to 50 milliliter of an absolute ethyl alcohol, 15 to 18 milliliter of a hydrochloric acid, 0.2 to 0.5 gram of a copper chloride, 0.2 to 0.5 gram of a magnesium chloride and 80 to 100 milliliter of a distilled water. The invention has the dosing method of the corrosive that the picronitric acid and / or the stannous acid and the ferric chloride are put into a container; the distilled water is divided into two shares, and one share is added into a medicine container; the absolute ethyl alcohol is divided into two shares, one share is added into an aqueous solution which is mixed with medicine, and the other share is added into the distilled water; the hydrochloric acid is added into the ethyl alcohol aqueous solution; the aqueous solution containing ethyl alcohol and hydrochloric acid is poured into the aqueous solution which is mixed with medicine, and the copper chloride and the magnesium chloride are added in. The chemical agent which is used in the corrosive reciprocally reacts mutually and has the strong conditionality, the efficiency of the core corrosive is exerted without forming a surface precipitation membrane, and a clear tree like crystal shape can be directly observed; the corroding time of the corrosive is short, and is suitable for a large size continuous casting semi finished metal; the dosing method of the corrosive is scientific, and the operating procedure is simple, convenient and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection, and in particular relates to a metallographic etchant suitable for silicon steel. Background technique [0002] At present, the metallographic inspection methods of iron and steel can display the solidification structure of continuous casting slabs, such as low heat acid etching and cold acid etching. Defects, while the cold acid etching method is not only used to display the surface or internal structure defects of steel, but also can display the dendrite morphology of the continuous casting slab crystallization during pouring and solidification, providing a technical basis for the optimization and improvement of the continuous casting process. [0003] There are many ways to show the solidification structure of continuous casting slab by cold acid etching, but most of them show defects and crystal grains. The cold corrosion solution introduced in the macroscopic inspection in...

AI Technical Summary

Problems solved by technology

After the film removal treatment, the dendrite morphology is often damaged to varying degrees, and it is extremely inconvenient to operate the large continuous casting slab sample

Moreover, the operation must be repeated many times and it is difficult to achieve the desired effect.

[0005] (2) The corrosive agent containing picric acid series has weak corrosion ability, too slow reaction, and the corrosion time is too long, even up to 5-6 hours

Some need to prepare two kinds of solutions for step-by-step etching, or alternately, this operation is not feasible for large-size continuous casting slab samples

[0006] (3) The dendrite corrosion agents introduced all indicate that they are suitable for carbon steel and alloy steel, or cast iron and copper alloy, but there is no mention of suitable for silicon steel

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