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Etching agent for inspecting S31042 and T91 or T92 dissimilar steel welding joint and preparation method of etching agent

A technology for welding joints and etchants, which is applied in the field of etchant preparation, can solve the problems of difficulty in mastering the etching speed and degree of etching, restricting the observation, analysis and photography of samples, and affecting the quality and efficiency of detection, so as to improve the Detection quality and detection efficiency, excellent and reliable detection methods, mild and easy-to-control etching process

Active Publication Date: 2021-08-27
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method can only carry out partial observation each time, it seriously restricts the overall observation, analysis and photography of the sample, which greatly affects the quality and efficiency of detection.
Although some use the one-time overall etching observation method, because the reagent composition is still some strong acid and strong oxidizing reagents, the etching speed and etching degree are difficult to grasp, and it is difficult to give good consideration to the tissue display operation. It often results in neglecting the other, and the results are still unsatisfactory

Method used

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  • Etching agent for inspecting S31042 and T91 or T92 dissimilar steel welding joint and preparation method of etching agent
  • Etching agent for inspecting S31042 and T91 or T92 dissimilar steel welding joint and preparation method of etching agent
  • Etching agent for inspecting S31042 and T91 or T92 dissimilar steel welding joint and preparation method of etching agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare etchant as follows:

[0031] (1) Measure 100g of distilled water and place it in a beaker, add 8g (in C 2 h 2 o 4 ﹒ 2H 2 O meter) oxalic acid (analytical pure, C 2 h 2 o 4 ﹒ 2H 2 O content 99.5%), stir after oxalic acid is completely dissolved, then add 50g (with H 3 PO 4 Meter) phosphoric acid (analytical pure, H 3 PO 4 Content 85%), continue to stir evenly, make etchant A;

[0032] (2) Measure 100g of distilled water and place it in a beaker, add 30g (in terms of NaCl) sodium chloride (analytically pure, NaCl content 99.5%), stir until the sodium chloride is completely dissolved, then add 100g (in terms of H 3 PO 4 Meter) phosphoric acid (analytical pure, H 3 PO 4 Content 85%), continue to stir evenly, make etchant B;

[0033] Carry out metallographic inspection of welded joints of S31042 and T92 dissimilar steels according to the following method:

[0034] (3) Immerse the ground and polished welded joint sample in etchant A for electrolytic ...

Embodiment 2

[0038] Prepare etchant as follows:

[0039] (1) Measure 90g of distilled water and place it in a beaker, add 6g (in C 2 h 2 o 4 ﹒ 2H 2 O meter) oxalic acid (analytical pure, C 2 h 2 o 4 ﹒ 2H 2 O content 99.5%), stir after oxalic acid is completely dissolved, then add 42g (with H 3 PO 4 Meter) phosphoric acid (analytical pure, H 3 PO 4 Content 85%), continue to stir evenly, make etchant A;

[0040] (2) Measure 90g of distilled water and place it in a beaker, add 25g (in terms of NaCl) sodium chloride (analytically pure, NaCl content 99.5%), stir and wait for the complete dissolution of sodium chloride, then add 85g (in terms of H 3 PO 4 Meter) phosphoric acid (analytical pure, H 3 PO 4 Content 85%), continue to stir evenly, make etchant B;

[0041] Conduct metallographic inspection of welded joints of S31042 and T91 dissimilar steels according to the following method:

[0042] (3) Immerse the ground and polished welded joint sample in etchant A for electrolyti...

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Abstract

The invention discloses a preparation method of an etching agent for inspecting an S31042 and T91 or T92 dissimilar steel welding joint. The preparation method comprises the preparation of an etching agent A and the preparation of an etching agent B. The step of preparing the etching agent A comprises the sub-step of uniformly mixing oxalic acid, phosphoric acid and distilled water, wherein the mass ratio of the oxalic acid to the phosphoric acid to the distilled water is as follows: the mass of the oxalic acid calculated in terms of C2H2O4.2H2O to the mass of the phosphoric acid calculated in terms of H3PO4 to the distilled water is (6-8): (42-50): (90-100). The step of preparing the etching agent B comprises the sub-step of uniformly mixing sodium chloride, phosphoric acid and distilled water, wherein the mass ratio of the sodium chloride to the phosphoric acid to the distilled water is as follows: the mass of sodium chloride calculated in terms of NaCl to the phosphoric acid calculated in terms of H3PO4 to the distilled water is (20-30): (85-100): (90-100). The method has the advantages that the overall observation of the metallographic structure of the S31042 and T91 or T92 dissimilar steel welding joint is realized, the detection quality and the detection efficiency are improved, and an excellent and reliable detection means is provided for the quality control and rapid detection of the S31042 and T91 / 92 dissimilar steel welding joint.

Description

technical field [0001] The invention relates to physical and chemical inspection of welded joints, in particular to a method for preparing an etchant for metallographic inspection of welded joints. Background technique [0002] As the country promotes the concept of green, environmentally friendly and low-carbon development, the country has higher and higher requirements for energy conservation and emission reduction of thermal power plants. In order to achieve ultra-low emissions of coal-fired units, as well as save energy and improve thermal efficiency, it is inevitable to vigorously promote and build high-parameter, large-capacity ultra-(ultra)critical units. This makes the new heat-resistant steel materials T91 / 92, S31042, and S30432 for boilers with higher thermal performance become the main materials for manufacturing high-temperature components such as superheaters and reheaters of super (super) critical units, and are widely used. There must be a large number of dis...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N21/84
CPCG01N1/32G01N21/84
Inventor 曾辉杨金炳普晓明敬仕煜刘霞赵彦
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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