Corrosive capable of displaying ultra low carbon steel solidification arborescent structure and preparation method thereof

Abstract

The invention discloses a corrosive capable of displaying an ultra low carbon solidification arborescent structure and a preparation method thereof. The corrosive is prepared from the following components: picric acid, stannous chloride, copper chloride, hydrochloric acid, surfactant, absolute ethyl alcohol and distilled water. The preparation method is as follows: taking a specified amount of the distilled water, and equally dividing the distilled water into two parts; mixing and putting solid medicament into a glass container according to fixed quantity, and adding one part of the distilledwater into the solid mixed medicament to dissolve the medicament; adding a specified amount of the absolute ethyl alcohol into another part of spare distilled water; adding a hydrochloric acid solution into the absolute ethyl alcohol solution; mixing the ethyl alcohol and the hydrochloric acid solution which are poured into an aqueous solution containing the solid medicament; fully stirring; and finally adding the surfactant to finish preparing. By utilizing the reagent provided by the invention, the solidified arborescent structure forms of ultra low C, S, P continuous casting steel billets can be displayed clearly, a finish requirement on sample surface is lowered, the sample preparation working procedure is simplified and the larbour intensity of operators is lowered.

Description

technical field

[0001] The patent of the present invention relates to the field of metallurgical analysis, in particular to a corrosion inspection reagent for displaying the solidified dendrite structure of metallurgical continuous casting slabs, specifically a corrosion agent and a preparation method for displaying the solidified dendrite structure of ultra-low carbon steel. Background technique

[0002] Dendrite is an initial metallographic structure formed during metal solidification, and its shape directly affects the properties of materials. Therefore, more and more attention has been paid to the inspection of dendrite structure in the field of metallurgical analysis. At present, in the metallographic analysis methods of iron and steel, there are low heat acid etching method and cold acid etching method for the inspection of continuous casting slab solidification structure. The hot acid etching method is to use 1:1 hydrochloric acid aqueous solution to corrode to show ...

Examples

Embodiment 1

[0028] The corrosion agent and the preparation method are used for detecting the dendrite morphology of ultra-low carbon steel continuous casting slabs containing 0.001% to 0.006% of C and containing a small amount of S.P.

[0029] Mix 4 grams of picric acid, 1.5 grams of stannous chloride, and 3.5 grams of copper chloride in a glass container, take 1000 ml of distilled water, divide it evenly into two parts, add one part to the glass container, and the other part for later use. Add 60 ml of absolute ethanol to the spare distilled water. Take 40 ml of 36% hydrochloric acid by weight and add it to the ethanol aqueous solution. Pour the ethanol and hydrochloric acid aqueous solution into the aqueous solution containing the solid medicament and stir thoroughly, then add 50 ml of surfactant and continue to stir evenly to form a comprehensive medicinal solution I, which is used after 30 hours of passivation.

[0030] Wipe the surface of the sample with cotton wool dipped in the co...

Embodiment 2

[0032] The corrosion agent and preparation method are used for detecting the dendrite morphology of ultra-low carbon steel continuous casting slabs with a C content of 0.004% to 0.008%, low S and P contents, and trace alloy elements V, Ti and Ni.

[0033] Mix 3 grams of picric acid, 1.5 grams of stannous chloride, and 2 grams of copper chloride in a glass container, take 1000 ml of distilled water, and divide it into two parts, one part is added to the glass container, and the other part is used for later use. Add 60 ml of absolute ethanol to the spare distilled water. Take 30 ml of 36% hydrochloric acid by weight and add it to the ethanol aqueous solution. Pour the ethanol and hydrochloric acid aqueous solution into the aqueous solution containing the solid medicament and stir thoroughly, then add 40 ml of surfactant and stir evenly to form medicinal solution II, which is used after 30 hours of passivation.

[0034] Wipe the surface of the sample with a cotton swab dipped in...

Embodiment 3

[0036] Corrosion agent and preparation method for detecting dendritic morphology of ultra-low carbon steel continuous casting slabs containing 0.008% to 0.012% C, low S.P content, but containing trace amounts of V, Ti, Ni, Cr and other alloying elements.

[0037] Mix 4 grams of picric acid, 1.5 grams of stannous chloride, and 4 grams of copper chloride into a glass container, take 1000 ml of distilled water, and divide it into two parts evenly, one part is added to the glass container, and the other part is used for later use. Add 80 ml of absolute ethanol to the spare distilled water. Take 40 ml of hydrochloric acid and add it to the aqueous ethanol solution. Pour the ethanol + hydrochloric acid aqueous solution into the aqueous solution containing the solid drug and stir thoroughly, then add 50 ml of surfactant and stir evenly to form medicinal solution III, which is used after 30 hours of passivation.

[0038] Wipe the surface of the sample with a cotton swab dipped in liq...

technical field

[0001] The patent of the present invention relates to the field of metallurgical analysis, in particular to a corrosion inspection reagent for displaying the solidified dendrite structure of metallurgical continuous casting slabs, specifically a corrosion agent and a preparation method for displaying the solidified dendrite structure of ultra-low carbon steel. Background technique

[0002] Dendrite is an initial metallographic structure formed during metal solidification, and its shape directly affects the properties of materials. Therefore, more and more attention has been paid to the inspection of dendrite structure in the field of metallurgical analysis. At present, in the metallographic analysis methods of iron and steel, there are low heat acid etching method and cold acid etching method for the inspection of continuous casting slab solidification structure. The hot acid etching method is to use 1:1 hydrochloric acid aqueous solution to corrode to show ...

Examples

Embodiment 1

[0028] The corrosion agent and the preparation method are used for detecting the dendrite morphology of ultra-low carbon steel continuous casting slabs containing 0.001% to 0.006% of C and containing a small amount of S.P.

[0029] Mix 4 grams of picric acid, 1.5 grams of stannous chloride, and 3.5 grams of copper chloride in a glass container, take 1000 ml of distilled water, divide it evenly into two parts, add one part to the glass container, and the other part for later use. Add 60 ml of absolute ethanol to the spare distilled water. Take 40 ml of 36% hydrochloric acid by weight and add it to the ethanol aqueous solution. Pour the ethanol and hydrochloric acid aqueous solution into the aqueous solution containing the solid medicament and stir thoroughly, then add 50 ml of surfactant and continue to stir evenly to form a comprehensive medicinal solution I, which is used after 30 hours of passivation.

[0030] Wipe the surface of the sample with cotton wool dipped in the co...

Embodiment 2

[0032] The corrosion agent and preparation method are used for detecting the dendrite morphology of ultra-low carbon steel continuous casting slabs with a C content of 0.004% to 0.008%, low S and P contents, and trace alloy elements V, Ti and Ni.

[0033] Mix 3 grams of picric acid, 1.5 grams of stannous chloride, and 2 grams of copper chloride in a glass container, take 1000 ml of distilled water, and divide it into two parts, one part is added to the glass container, and the other part is used for later use. Add 60 ml of absolute ethanol to the spare distilled water. Take 30 ml of 36% hydrochloric acid by weight and add it to the ethanol aqueous solution. Pour the ethanol and hydrochloric acid aqueous solution into the aqueous solution containing the solid medicament and stir thoroughly, then add 40 ml of surfactant and stir evenly to form medicinal solution II, which is used after 30 hours of passivation.

[0034] Wipe the surface of the sample with a cotton swab dipped in...

Embodiment 3

[0036] Corrosion agent and preparation method for detecting dendritic morphology of ultra-low carbon steel continuous casting slabs containing 0.008% to 0.012% C, low S.P content, but containing trace amounts of V, Ti, Ni, Cr and other alloying elements.

[0037] Mix 4 grams of picric acid, 1.5 grams of stannous chloride, and 4 grams of copper chloride into a glass container, take 1000 ml of distilled water, and divide it into two parts evenly, one part is added to the glass container, and the other part is used for later use. Add 80 ml of absolute ethanol to the spare distilled water. Take 40 ml of hydrochloric acid and add it to the aqueous ethanol solution. Pour the ethanol + hydrochloric acid aqueous solution into the aqueous solution containing the solid drug and stir thoroughly, then add 50 ml of surfactant and stir evenly to form medicinal solution III, which is used after 30 hours of passivation.

[0038] Wipe the surface of the sample with a cotton swab dipped in liq...

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