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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 oxidizing and corrosive, and it may cause combustion and explosion when it contacts or mixes with organic substances, reducing agents, flammable substances, etc.

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
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0036] C. Put the metallographic corrosion solution prepared in step B into the container with the cathode installed, and heat it to 42°C in a water bath;

[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, and press 0.13A / cm 2 Set current size;

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

[003...

Embodiment 2

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

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

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

[0045] C. Put the metallographic corrosion solution prepared in step B into the container with the cathode installed, and heat it to 45°C in a water bath;

[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, and press 0.15A / cm 2 Set current size;

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

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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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