Metallographic corrosive agent for invar welded joint welded by using M93 welding wires and preparation method for metallographic corrosive agent

A technology for welded joints and Invar steel, applied in the field of metallographic chemical etchant and its preparation, can solve the problems of unreality, unclear microstructure image, low quality, etc., achieve fast corrosion speed, good microstructure display effect, good corrosion effect

Inactive Publication Date: 2013-04-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems that the quality of the sample corroded by the Invar steel welded joint is low in metallographic observation, and th

Method used

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Examples

Experimental program
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specific Embodiment approach 1

[0012] Specific embodiment one: A metallographic corrosion agent for Invar steel welded joints welded with M93 welding wire in this embodiment is composed of 50-100mL HCl solution with a mass concentration of 36%-38%, 5-10g FeCl 3 Prepared by mixing with 50-100mL of water.

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that a metallographic corrosion agent for Invar steel welded joints welded with M93 welding wire is composed of 60 mL of HCl solution with a mass concentration of 36% to 38%, 6g of FeCl 3 Mix with 70mL of water to make. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Specific implementation mode three: a method for preparing a metallographic corrosion agent for Invar steel welded joints welded with M93 welding wire according to this embodiment is implemented according to the following steps:

[0015] 1. Accurately weigh 50-100mL HCl solution with a mass concentration of 36%-38%, 5-10g FeCl 3 With 50~100mL water;

[0016] Two, then weigh the FeCl 3 Add to water and stir until it is completely dissolved to form a uniform mixed solution;

[0017] 3. Slowly add the HCl solution with a mass concentration of 36% to 38% into the mixed solution prepared in step 2, and stir evenly, that is, the preparation of metallographic etchant for Invar steel welded joints welded with M93 welding wire is completed.

[0018] When applying the above implementation methods, when corrosion is required, just immerse the polished metallographic sample inspection surface in the chemical etchant or wipe the sample inspection surface with the chemical etchant ...

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Abstract

The invention relates to metallographic chemical corrosive agents and preparation methods thereof, in particular to a metallographic corrosive agent for an invar welded joint welded by using M93 welding wires and a preparation method for the metallographic corrosive agent. The metallographic corrosive agent and the preparation method thereof aim at solving the metallographic problem of the invar welded joint welded by using the M93 welding wires. The metallographic corrosive agent is prepared by mixing HCl solution with the mass concentration of 36-38%, FeCl3 and water. The preparation method includes: A, accurately weighing HCl solution, FeCl3 and water; B, adding the weighed FeCl3 into the water, and stirring until completely dissolving to form a uniform mixture; and C, slowly adding the HCl into the mixture to form the metallographic corrosive agent, namely, preparation of the metallographic corrosive agent for the invar welded joint welded by using the M93 welding wires is finished.

Description

technical field [0001] The invention relates to a metallographic chemical etchant and a preparation method thereof, in particular to a metallographic etchant for Invar steel welded joints welded with M93 welding wire and a preparation method thereof. Background technique [0002] Invar steel belongs to the precision alloy of low expansion alloy category, it has a large number of applications, and its product value is also high. It is widely used in the electronics industry. It is used in electron tubes, transistor integrated circuits, and capacitors. In recent years, Invar steel has been used as an old material for new applications. It is used in the welding and manufacturing of composite molds. The use of M93 welding wire for Invar steel welding can ensure the consistency of physical properties (low thermal expansion coefficient) and material integrity and no fracture in the welding fusion zone (especially multi-layer multi-pass welding). [0003] In the welding process of...

Claims

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Application Information

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IPC IPC(8): C23F1/28G01N1/32
Inventor 董志波张家铭郑文健宋奎晶孙海洋胡文良王帅丽
Owner HARBIN INST OF TECH
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