Austenitic stainless steel welding seam structure corrosive agent and application method thereof

Abstract

The invention discloses an austenitic stainless steel welding seam structure corrosive agent and an application method thereof. The corrosive agent is composed of concentrated hydrochloric acid, cupric chloride, and absolute ethyl alcohol. The application method comprises the following steps: 1) preparation of a metallographic sample: a stainless steel weld sample block is subjected to grinding bywaterproof abrasive paper with different granularity and mechanical polishing; 2) corrosion of the metallographic sample: the metallographic sample is immersed to corrosion liquid for corrosion; and3) observation of the corrosive metallographic sample: the corrosive sample is taken and the sample is flushed with a lot of water and alcohol, and air drying is performed and dendritic structure is observed under a microscope. The austenitic stainless steel welding seam structure corrosive agent has the advantages of simple preparation, easy storage, convenient operation, and obvious corrosion effect; the corrosive fusion line and weld dendrite are obvious, the structure is intelligible, and over corrosion or nonuniform corrosion phenomenon cannot be generated. The improved welding mode is improved, and according to bonding of austenitic stainless steel weld, each performance of stainless steel weld assembly is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection and analysis, and in particular relates to an austenitic stainless steel weld structure corrosive agent and a use method thereof. Background technique [0002] Austenitic stainless steel has a stable austenite structure at room temperature, is non-magnetic as a whole and has high toughness and plasticity. Compared with other types of stainless steel, austenitic stainless steel is easier to weld, does not undergo phase transformation under any circumstances, is not sensitive to hydrogen, and has better plasticity and toughness in welded joints in the welded state. But it is easy to form defects such as thermal cracks and intergranular corrosion. The quality of the welded joint directly affects the performance of the entire weldment. Therefore, by observing the weld structure, the appropriate welding process and welding method can be adjusted to improve the performance of the wel...

AI Technical Summary

Problems solved by technology

When aqua regia and nitric acid are used to corrode the weld, because of its strong corrosiveness, it is easy to cause over-corrosion to the sample, so that the surface of the sample shows uneven corrosion, and is volatile and highly corrosive, which has certain safety hazards. person causing injury

[0004] The etchant described in Publication No. CN101144762A "An Etchant for Displaying the Solidified Structure of Silicon Steel and Its Preparation Method" is only suitable for silicon steel, and the dosage of the agent needs to be adjusted according to the type and content of specific alloy elements in the chemical composition of silicon steel, and the solution preparation is more complicated

[0005] The corrosive solution described in the application number 201410488828.6 "A Method for Surface Corrosion of Ferritic Stainless Steel Weld Seam" has weak corrosiveness and is not suitable for corrosion of nickel-chromium-containing austenitic stainless steel

[0006] Application No. 201410702250.X "An Etching Solution and Corrosion Method for Solidification Structure and Dendrite Structure in Vibration Mark Area of ​​Austenitic Stainless Steel Continuous Casting Slab" The corrosion effect of the corrosive solution is not good

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