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Method for metallographic corrosion of welding surface of titanium steel plate welded by silver based solder

A silver-based brazing filler metal and metallographic corrosion technology, applied in the field of metallographic corrosion, can solve the problems of different degrees of corrosion of nitric acid alloys, difficult to control the operation process, strict requirements of the corrosive liquid, etc. Clear, low-cost processing results

Inactive Publication Date: 2009-11-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If nitric acid is used for the overall corrosion of the interface, the interface is not clear, mainly because nitric acid corrodes different alloys in different degrees; The requirements are relatively strict, and the operation process is difficult to control, especially for the interface connected by multiple alloys

Method used

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  • Method for metallographic corrosion of welding surface of titanium steel plate welded by silver based solder
  • Method for metallographic corrosion of welding surface of titanium steel plate welded by silver based solder

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Embodiment 1

[0029] Such as figure 1 , figure 2 Shown, the metallographic corrosion method of the welding surface of the titanium steel plate that adopts silver-based solder welding of the present invention comprises the following steps:

[0030] Step 1, metallographic corrosion treatment is carried out on the titanium layer 1 on the welding surface of the titanium steel plate, and the treatment process is as follows:

[0031] 101. Prepare corrosion solution 1: Use 1 ml of HF solution with a mass percentage concentration of 30% to 50% and 5 ml of water to uniformly mix and prepare corrosion solution 1.

[0032] 102. After dipping medicinal cotton into the corrosive solution 1, wipe evenly on the titanium layer 1 on the welding surface of the titanium steel plate to be treated for two to three times. During the wiping process, the corrosive solution 1 should be prevented from penetrating into the titanium layer to be wiped. 1 Adjacent steel layer 2 and silver-based solder layer 3.

[00...

Embodiment 2

[0043] In this embodiment, the difference from Embodiment 1 is that when configuring corrosion solution 1 in step 101, 0.8 ml of HF solution with a mass percentage concentration of 30% to 50% and 5 ml of water are evenly mixed to prepare corrosion solution 1. When configuring the corrosion solution 2 in step 201, 2ml of HNO with a mass percentage concentration of 60% to 80% is used 3 The solution and 7ml of water are evenly mixed to form corrosion solution 2. When configuring the corrosion solution 3 in step 301, use 0.5g of potassium dichromate, 1.2ml of concentrated sulfuric acid with a mass percentage concentration ≥ 90% and 15ml of water to uniformly mix and configure the corrosion solution 3. In this embodiment, the rest of the method steps are the same as in Embodiment 1.

Embodiment 3

[0045] In this embodiment, the difference from Embodiment 1 is that: in step 101 when the corrosion solution 1 is prepared, 2.5 ml of HF solution with a concentration of 30% to 50% by mass and 10 ml of water are evenly mixed to prepare the corrosion solution 1. When configuring the corrosion solution 2 in step 201, use 2.5ml of HNO with a concentration of 60% to 80% by mass 3 The solution and 8ml of water are evenly mixed to prepare corrosion solution 2. When configuring the corrosion solution 3 in step 301, use 1g of potassium dichromate, 3ml of concentrated sulfuric acid with a mass percentage concentration ≥ 90% and 25ml of water to uniformly mix and prepare the corrosion solution 3. In this embodiment, the rest of the method steps are the same as in Embodiment 1.

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Abstract

The invention discloses a method for metallographic corrosion of the welding surface of a titanium steel plate welded by a silver based solder. The method comprises the following steps of: 1, performing metallographic corrosion treatment on a titanium layer on the welding surface of the titanium steel plate: cleaning the titanium layer by etchant solution I prepared from HF solution and water, and washing the titanium layer after precipitation of crystal boundary; 2, performing metallographic corrosion treatment on a steel layer on the welding surface of the titanium steel plate: cleaning the steel layer by etchant solution II prepared from nitric acid and water, and washing the steel layer after precipitation of crystal boundary; and 3, performing metallographic corrosion treatment on a silver based solder layer on the welding surface of the titanium steel plate: cleaning the silver based solder layer by etchant solution III prepared from water, concentrated sulfuric acid and potassium dichromate, and washing the silver based solder layer by alcohol after precipitation of crystal boundary and blow-drying the silver based solder layer for use of metallographic observation. The method has the advantages of reasonable design, simple treatment method and good treatment effect, and can effectively overcome the defects of difficult control of operation and poor treatment effect existing in the prior metallographic corrosion treatment on the welding surface of the titanium alloy.

Description

technical field [0001] The invention relates to a metallographic corrosion method, in particular to a metallographic corrosion method for welding surfaces of titanium steel plates welded by silver-based solder. Background technique [0002] Because titanium has excellent properties such as high temperature resistance and corrosion resistance, it is widely used in the chemical industry. In addition, titanium-steel clad plates are currently widely used in large-scale titanium equipment, such as pressure vessels, and some key parts of the connection need to be welded between titanium and steel. Correspondingly, the performance of the welded parts is directly related to the pressure vessel. service life. Therefore, in the welding process of titanium-steel clad plates, in order to understand the welding performance, it is necessary to observe the microstructure of the weld seam and the heat-affected zone, and understand the diffusion and connection of the solder in the matrix ma...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N23/04
Inventor 郭萍卢亚峰杨永福洪权杜宇叶建林
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH