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Double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and corrosion method

A duplex stainless steel and microstructure technology, which is applied in the field of duplex stainless steel microstructure and σ mesophase color etchant and corrosion, can solve the problem of poor thermal processing performance of duplex stainless steel, easy corrosion of σ phase, easy over-corrosion, etc. problem, to achieve the effect of good erosion effect, simple configuration and easy operation

Inactive Publication Date: 2012-11-07
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor thermal processing performance of duplex stainless steel, edge cracks and surface cracks tend to occur during thermal processing, and the thermal processing performance has a certain relationship with the microstructure and intermediate precipitated phase (mainly σ phase) of duplex stainless steel, so it is necessary to For observation and research, alkaline solutions such as 30% sodium hydroxide or potassium hydroxide are generally used for electrolytic corrosion of duplex stainless steel structures. The σ phase is easily corroded, and the operation is troublesome, etc.

Method used

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  • Double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and corrosion method
  • Double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and corrosion method
  • Double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and corrosion method

Examples

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Embodiment 1

[0025] The following part of this example describes a duplex stainless steel microstructure and sigma mesophase color etchant.

[0026] Consists of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, each composition is: potassium metabisulfite 0.3g; hydrochloric acid (mass percentage concentration: 40%) 10ml; nitric acid (mass percentage concentration: 68%) 5ml ; Hydrofluoric acid (mass percentage concentration is 40%) 10ml; deionized water 200ml.

[0027] The following part of this embodiment describes a microstructure of a duplex stainless steel and a configuration method of a sigma mesophase color etchant.

[0028] Prepare the corrosive agent in the following order: first weigh 0.3g of potassium metabisulfite, measure hydrochloric acid (mass percentage concentration is 40%) 10ml, nitric acid (mass percentage concentration is 68%) 5ml and hydrofluoric acid (mass percentage concentration 40%) 10ml, and then measure 200ml of deionized water, mix it i...

Embodiment 2

[0034] The following part of this example describes a duplex stainless steel microstructure and sigma mesophase color etchant.

[0035] This metallographic etching agent is made of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, and each composition is respectively: potassium metabisulfite 0.5g; Hydrochloric acid (mass percentage concentration is 40%) 15ml; Nitric acid (mass percentage concentration 68%) 10ml; hydrofluoric acid (mass percentage concentration 40%) 10ml; deionized water 200ml.

[0036] The following part of this embodiment describes a microstructure of a duplex stainless steel and a configuration method of a sigma mesophase color etchant.

[0037] Prepare the corrosive agent in the following order: first weigh 0.5g of potassium metabisulfite, measure hydrochloric acid (mass percentage concentration is 40%) 15ml, nitric acid (mass percentage concentration is 68%) 10ml and hydrofluoric acid (mass percentage concentration 40%) 10ml, a...

Embodiment 3

[0043] The following part of this example describes a duplex stainless steel microstructure and sigma mesophase color etchant.

[0044] This metallographic etching agent is made of hydrochloric acid, nitric acid, potassium metabisulfite and deionized water, and each composition is respectively: potassium metabisulfite 0.5g; Hydrochloric acid (mass percentage concentration is 40%) 10ml; Nitric acid (mass percentage concentration 68%) 10ml; hydrofluoric acid (mass percentage concentration 40%) 10ml; deionized water 150ml.

[0045] The following part of this embodiment describes a microstructure of a duplex stainless steel and a configuration method of a sigma mesophase color etchant.

[0046] Prepare the corrosive agent in the following order: first weigh 0.5g of potassium metabisulfite, measure hydrochloric acid (mass percentage concentration is 40%) 10ml, nitric acid (mass percentage concentration is 68%) 10ml and hydrofluoric acid (mass percentage concentration 40%) 10ml, t...

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Abstract

The present invention relates to a double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and a corrosion method, and is suitable for the detection of double-phase stainless steel. The corrosive comprises components of: 0.1-2g of potassium metabisulfite, 5-25ml of hydrochloric acid with mass percent concentration of 40%, 5-15ml of nitric acid with mass percent concentration of 68%, 5-15ml of hydrofluoric acid with mass percent concentration of 40% and 150-300 ml of deionized water. The invention has advantages of good corrosion effect, good display effect of structure of a corroded specimen, no pollution, stable corrosion reaction, and easy configuration.

Description

technical field [0001] The invention relates to a duplex stainless steel microstructure, a σ mesophase color etchant and a corrosion method, which are suitable for the detection of duplex stainless steel. Background technique [0002] Since the advent of duplex stainless steel, due to the performance advantages of both ferritic and austenitic stainless steel, it has excellent corrosion resistance, mechanical properties and welding properties. The combination of these excellent properties makes it widely used in petroleum, chemical, electric power and other fields. However, due to the poor thermal processing performance of duplex stainless steel, edge cracks and surface cracks tend to occur during thermal processing, and the thermal processing performance has a certain relationship with the microstructure and intermediate precipitated phase (mainly σ phase) of duplex stainless steel, so it is necessary to For observation and research, alkaline solutions such as 30% sodium hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 颜海涛杨振袁辉刘腾飞申鹏刘来山
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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