Double-phase stainless steel metallographical corrosive liquid formula and application method thereof

A duplex stainless steel and metallographic corrosion technology, which is applied in the preparation of test samples, etc., can solve the problems of combustion and explosion, complicated operation, and high risk of potassium sulfite, so as to improve the overpotential, improve the operating conditions, and the operating conditions are good Effect

Active Publication Date: 2020-04-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods are complicated to operate, and the perchloric acid and potassium metabisulfite used are more dangerous
Especially perchloric acid is strong

Method used

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  • Double-phase stainless steel metallographical corrosive liquid formula and application method thereof
  • Double-phase stainless steel metallographical corrosive liquid formula and application method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1

[0033] Taking the calculation of the two-phase ratio of 2205 duplex stainless steel as an example, the specific implementation is as follows:

[0034] A. Grind the sample to be corroded with 120-2000# sandpaper step by step, and use 3.5 μm and 1 μm diamond abrasive paste polishing;

[0035] B, 20g sodium sulfite and 2g thiourea are dissolved in 45ml water, the aqueous solution and 40ml phosphoric acid, 52ml sulfuric acid are added successively in 160ml glycerol;

[0036] C, put the metallographic etching solution prepared in step B in the container of the installed cathode, and heat the water bath to 42°C;

[0037] D. Measure the area of ​​the sample to be corroded, connect the sample to be corroded to the anode of the DC power supply, press 0.13A / cm 2 Set the current size;

[0038] E. Immerse the sample to be corroded in the metallographic etching solution, turn on the DC power supply, and corrode the sample for 2 minutes;

[0039] F. Turn off the D...

Example Embodiment

[0041] Example 2

[0042] Taking the use of EDS to measure the two-phase composition of 2507 duplex stainless steel as an example, its specific implementation is as follows:

[0043] A. Grind the sample to be corroded with 120-2000# sandpaper step by step, and use 3.5 μm and 1 μm diamond abrasive paste polishing;

[0044] B, 20g sodium sulfite and 2g thiourea are dissolved in 45ml water, the aqueous solution and 42ml phosphoric acid, 54ml sulfuric acid are added successively in 160ml glycerol;

[0045] C. The metallographic etchant prepared in step B is placed in the container where the cathode has been installed, and the water bath is heated to 45°C;

[0046] D. Measure the area of ​​the sample to be corroded, connect the sample to be corroded to the anode of the DC power supply, press 0.15A / cm 2 Set the current size;

[0047] E. Immerse the sample to be corroded in the metallographic etching solution, turn on the DC power supply, and corrode the sample for 2 minutes; ...

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Abstract

The invention discloses a double-phase stainless steel metallographical corrosive liquid formula and an application method thereof. Each part of corrosive liquid comprises 40-45 ml of phosphoric acid,50-60 ml of sulfuric acid, 155-165 ml of glycerinum, 40-50 ml of water, 15-30 g of sodium sulfite and 2-5 g of thiourea. According to the provided scheme, operation is easy, the fault-tolerant degreeis high, and the situations of excessive corrosion and the like are not likely to happen. The metallographical corrosive liquid is easy to prepare, acidity is low, and operation conditions are good during corrosion. After the corrosive liquid is adopted for corrosion, an obtained structure is free of a mechanically-polished stress layer, and later study is facilitated.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion solution preparation, in particular to a formula of a duplex stainless steel metallographic corrosion solution and a method for using the same. Background technique [0002] Ferritic-austenitic duplex stainless steel (Duplex Stainless Steels, DSS) is widely used in acid due to the combination of ferritic stainless steel’s ion corrosion resistance, high strength and austenitic stainless steel’s excellent toughness and easy welding. In complex service environments such as oil and gas exploration platforms and hydrogen pipelines. In addition, the strength of duplex stainless steel is much higher than that of ordinary austenitic stainless steel, and it is often used to reduce the weight of metal equipment. [0003] In order to accurately measure the phase content of duplex stainless steel, or to study the difference between the two phases of duplex stainless steel, it is first necess...

Claims

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Application Information

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IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 叶飞陶平赵晨宇巩建鸣赵嘉喜耿鲁阳
Owner NANJING UNIV OF TECH
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