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

A technology of austenitic stainless steel and corrosive agent, which is applied in the field of austenitic stainless steel weld structure corrosive agent, which can solve the problems of over-corrosion of samples, complicated solution preparation, volatile and other problems, and achieve improved welding method, obvious corrosion effect and clear structure Effect

Inactive Publication Date: 2018-03-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 chemi

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0033] 316L stainless steel is used in this embodiment, and the chemical composition of the steel is shown in Table 1.

[0034] Table 1 Chemical composition and mass percentage (wt%) of 316L stainless steel

[0035]

[0036] The 316L stainless steel weld structure corrosive agent and its application method include the following steps:

[0037] 1. Preparation of etchant, the specific steps are as follows:

[0038] Weigh 3g of copper chloride with a mass fraction of 99% on an electronic balance, pour it into a beaker, measure 50ml of concentrated hydrochloric acid with a mass fraction of 36% with a graduated cylinder, slowly pour it into the beaker along the wall of the cup, and keep stirring with a glass rod to make the chlorine Dissolve copper particles, and finally add 50ml of 97% absolute ethanol, stir gently with a glass rod to mix the solution evenly, then pour it into a volumetric flask, let the solution stand for 20 minutes, and set aside.

[0039] 2. Preparation of...

Embodiment 2

[0044] 1Cr17Mn9Ni4N high-nitrogen stainless steel is used in this embodiment, and the chemical composition of the steel is shown in Table 2.

[0045] Table 2 Chemical composition and mass percentage (wt%) of 1Cr17Mn9Ni4N high-nitrogen stainless steel

[0046]

[0047] 1Cr17Mn9Ni4N high-nitrogen stainless steel weld structure corrosion agent and its use method include the following steps:

[0048] 1. Preparation of etchant, the specific steps are as follows:

[0049] Weigh 2g of copper chloride with a mass fraction of 99% on an electronic balance, pour it into a beaker, measure 30ml of concentrated hydrochloric acid with a mass fraction of 36% with a graduated cylinder, slowly pour it into the beaker along the wall of the cup, and keep stirring with a glass rod to make the chlorine Dissolve the copper particles, and finally add 80ml of 97% absolute ethanol, stir gently with a glass rod to mix the solution evenly, then pour it into a volumetric flask, and let the solution stan...

Embodiment 3

[0055] 316L stainless steel is used in this embodiment, and the chemical composition of the steel is shown in Table 3.

[0056] Table 3 Chemical composition and mass percentage (wt%) of 316L stainless steel

[0057]

[0058] The 316L stainless steel weld structure corrosive agent and its application method include the following steps:

[0059] 1. Preparation of etchant, the specific steps are as follows:

[0060] Weigh 2.5g of copper chloride with a mass fraction of 99% on an electronic balance, pour it into a beaker, measure 40ml of concentrated hydrochloric acid with a mass fraction of 38% with a graduated cylinder, slowly pour it into the beaker along the wall of the cup, and keep stirring with a glass rod to make Dissolve the cupric chloride particles, and finally add 65ml of 98% absolute ethanol, stir gently with a glass rod to mix the solution evenly, then pour it into a volumetric flask to constant volume, and let the solution stand for 20 minutes for use.

[0061]...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N1/28G01N1/32
Inventor 史远谷秀锐
Owner HEBEI IRON AND STEEL
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