Dendritic crystal corroding agent for high nitrogen austenitic stainless steel and preparation method thereof

Abstract

The invention provides a dendritic crystal corroding agent for high nitrogen austenitic stainless steel and a preparation method thereof, and belongs to the field of inspection and analysis of steel billet at low magnification. The dendritic crystal corroding agent is prepared from 0.6-2.1 g of cupric chloride, 0.1-0.3 g of magnesium chloride, 1-3 g of ferric chloride, 100 mL of water, 9-12 mL of hydrochloric acid, 1-4 mL of nitric acid and 125-130 mL of absolute ethyl alcohol. The preparation method comprises the steps of step 1, based on the proportioning, adding in sequence water, cupric chloride, magnesium chloride, ferric chloride, hydrochloric acid, nitric acid and absolute ethyl alcohol, stirring uniformly, keeping the solution static for 5-15 minutes, and step 2, polishing the surface of the test surface of the austenitic stainless steel, corroding the surface with corroding agent for 2-5 minutes, waiting until the generation of clearly visible dendritic crystal solidified structure, then rinsing and blow-drying the test surface, then testing and observing the corrosion effect. The corroding agent can easily, quickly and effectively show the corrosion condition of the dendritic crystal of the high nitrogen austenitic stainless steel, can explicitly manifest the solid dendritic crystal structure, and can accurately manifest the solidification defects. The corroding agent is good in repeatability.

Description

technical field [0001] The invention is applied to the technical field of low magnification inspection and analysis of steel billets, and particularly relates to a dendritic corrosive agent for high nitrogen austenitic stainless steel and a method for using the same. Background technique [0002] In the production process of ferrous metallurgy and non-ferrous metallurgy, ingots, continuous casting billets, castings (steel castings, iron castings and alloy castings) and rolled products need to be tested for various defects in order to improve production. technology to ensure product quality. The dendrite inspection method can clearly display the solidification structure of the slab and steel, and judge the solidification conditions according to the dendrite characteristics of the solidification structure. By changing the solidification conditions, product defects can be reduced, so as to guide production, and finally achieve the improvement of ingot and casting. the purpose ...

AI Technical Summary

Problems solved by technology

[0004] At present, the reported corrosive agents are not effective for dendritic corrosion of high nitrogen and high molybdenum steel grades (Cr≥16%, Mo≥2.5%, N≥0.7%)

Publication No. 103592170A discloses "Etching solution and detection method for detection of austenite grain size and dendrite segregation of steel", the invention uses picric acid, distilled water, copper chloride, anhydrous sodium carbonate, dodecylbenzenesulfonate Sodium nitrate and steel sheet are made into corrosive solution, let it stand for 24 hours and heated to 50 ℃ ~ 75 ℃, the dendrites of the sample can be accurately and clearly displayed; Dendrite corrosion does not work well

Publication No. 102174699A discloses "Continuous casting slab solidification structure and defective dendrite corrosion low-magnification test reagent and preparation method", the invention uses copper chloride, magnesium chloride, ferric chloride, hydrochloric acid, absolute ethanol and water made of corrosion solution The detection surface of the sample is corroded by pouring corrosion; the preparation and use of reagents in this method are simple, but the effect on dendrite corrosion of high nitrogen and high molybdenum ring steel is not obvious

Images