A kind of etchant for displaying intergranular cracks of continuous casting billet and preparation method thereof
An intergranular crack and etchant technology is applied in the field of etchant for displaying intergranular cracks in continuous casting billets and its preparation, which can solve the problem of not being able to display silicon steel completely and clearly, and achieve the effects of clear expansion pattern, easy operation and wide applicability.
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Embodiment 1
[0020] It is used to show the intergranular crack morphology of silicon steel continuous casting slabs containing C 0.04%; Si 1.45; Mn 0.65%; Cr 0.033%; Nb 0.01%; Ti 0.015%.
[0021] Take 3 grams of picric acid and add it to 1000 ml of distilled water, add 500 ml of absolute ethanol to the aqueous solution of picric acid, and then add 150 ml of hydrochloric acid to the aqueous solution of picric acid in absolute ethanol. Take another 1000 ml of distilled water, add 40 ml of nitric acid, slowly pour the aqueous solution of nitric acid into the aqueous solution of picric acid anhydrous ethanol hydrochloric acid and mix well. Take 20 milliliters of sodium alkylbenzene sulfonate and add it to the mixed solvent, and stir thoroughly to form the cold acid etching solution 1 of the present invention.
[0022] Wipe the surface of the sample with cotton wool dipped in corrosion solution 1, and corrode for 3-5 minutes evenly. When the cracks at the grain boundaries on the test surface ar...
Embodiment 2
[0024] Used to display C 0.0026%; Si 1.26%; Mn 0.52%; Cr 0.015%; Nb 0.004%;
[0025] Ti 0.016%; V0.004% silicon steel continuous casting slab intergranular crack morphology.
[0026] Take 4 grams of picric acid and add it to 1000 ml of distilled water, add 600 ml of absolute ethanol to the aqueous solution of picric acid, and then add 180 ml of salt to the aqueous solution of picric acid in absolute ethanol. Take another 1000 ml of distilled water, add 50 ml of nitric acid, slowly pour the nitric acid aqueous solution into the picric acid anhydrous ethanol hydrochloric acid aqueous solution and mix evenly. Take 20 milliliters of sodium alkylbenzene sulfonate and add it to the mixed solvent, and stir thoroughly to form the cold acid etching solution 2 of the present invention.
[0027] Wipe the surface of the sample with cotton wool dipped in corrosion solution 2, and corrode for 3-5 minutes evenly. When the cracks at the grain boundaries on the test surface are clearly observ...
Embodiment 3
[0029] It is used to display the intergranular crack morphology of low-alloy high-strength steel continuous casting slabs containing C 0.003%; Si 0.03-0.05%; Mn 0.18%; Ti 0.1%.
[0030] Take 4 grams of picric acid and add it to 1000 ml of distilled water, add 800 ml of absolute ethanol to the aqueous solution of picric acid, and then add 200 ml of salt to the aqueous solution of picric acid in absolute ethanol. Take another 1000 ml of distilled water, add 60 ml of nitric acid, slowly pour the nitric acid aqueous solution into the picric acid anhydrous ethanol hydrochloric acid aqueous solution and mix evenly. Take 20 milliliters of sodium alkylbenzene sulfonate and add it to the mixed solvent, and stir thoroughly to form the cold acid etching solution 3 of the present invention.
[0031] Wipe the surface of the sample with cotton wool dipped in corrosion solution 3, and corrode evenly for 5-7 minutes. When the cracks at the grain boundaries on the test surface are clearly obse...
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