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Electrolytic corrosion method of stainless steel/carbon steel composite plate metallographic structure

A technology of electrolytic corrosion and metallographic structure, applied in the field of metallographic corrosion, can solve the problems of laboratory personnel's health injury, large difference in corrosion resistance, poor corrosion resistance of carbon steel, etc., to reduce health injury, simple formula, and corrosion effect. Good results

Inactive Publication Date: 2016-08-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Good metallographic corrosion of stainless steel / carbon steel clad plate can obtain clear grain boundary structure morphology, determine the grain size level of the sample and identify trace cementite structure, but there are two major aspects of metallographic corrosion of stainless steel / carbon steel clad plate Difficulties, one is that stainless steel has good corrosion resistance, and its metallographic structure cannot be revealed in general corrosive solutions
The second is that carbon steel has poor corrosion resistance, and its metallographic structure cannot be revealed due to severe corrosion of the carbon steel layer.
Due to the great difference in corrosion resistance between the two sides of the stainless steel / carbon steel clad plate interface, it is difficult to display the metallographic structure at the clad plate interface using conventional corrosion methods
At present, the commonly used corrosive agents for metallographic corrosion of stainless steel / carbon steel clad plates are nitric acid, hydrochloric acid and water in a certain volume percentage ratio, or hydrofluoric acid, nitric acid and water in a certain volume percentage ratio. It is easy to cause excessive corrosion on the carbon steel side
In the corrosion method, the corrosion method that can be consulted is ferric chloride-hydrochloric acid-water solution, which uses corrosive, volatile, and highly irritating hydrochloric acid, which is easy to cause harm to the health of experimenters during use; In addition, its corrosion effect is not ideal, and the carbon steel layer is easy to cause over-corrosion.

Method used

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  • Electrolytic corrosion method of stainless steel/carbon steel composite plate metallographic structure
  • Electrolytic corrosion method of stainless steel/carbon steel composite plate metallographic structure
  • Electrolytic corrosion method of stainless steel/carbon steel composite plate metallographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) After the stainless steel / carbon steel composite plate samples are polished with 400#, 600#, 800#, 1000#, 1500#, 2000#, 2500#, 3000# water-grinding sandpaper in sequence, and then mechanically polishing;

[0037] (2) Preparation of etchant 1: Take 4ml of nitric acid and 96ml of alcohol with a mass percentage concentration of 65%, slowly pour the measured nitric acid solution into a glass container filled with alcohol along the container wall, and stir evenly with a glass rod ;

[0038] (3) Spray the mechanically polished sample with the etchant 1 prepared in step (2), and the corrosion residence time is 6s.

[0039] (4) Take out the corroded sample in step (3) from the etchant 1, rinse it with absolute ethanol and dry it.

[0040] (5) Preparation of etchant 2: Weigh 10 g of chromium trioxide and 100 ml of deionized water, pour deionized water and chromium trioxide into a glass container successively, and stir with a glass rod until chromium trioxide is completely ...

Embodiment 2

[0045] (1) After the stainless steel / carbon steel composite plate samples are polished with 400#, 600#, 800#, 1000#, 1500#, 2000#, 2500#, 3000# water-grinding sandpaper in sequence, and then mechanically polishing;

[0046] (2) Preparation of etchant 1: Take 4ml of nitric acid and 96ml of alcohol with a mass percentage concentration of 65%, slowly pour the measured nitric acid solution into a glass container filled with alcohol along the container wall, and stir evenly with a glass rod ;

[0047] (3) Spray the mechanically polished sample with the etchant 1 prepared in step (2), and the corrosion residence time is 6s.

[0048] (4) Take out the corroded sample in step (3) from the etchant 1, rinse it with absolute ethanol and dry it.

[0049] (5) Preparation of etchant 2: Weigh 10 g of chromium trioxide and 100 ml of deionized water, pour deionized water and chromium trioxide into a glass container successively, and stir with a glass rod until the chromium trioxide is complet...

Embodiment 3

[0054] (1) After the stainless steel / carbon steel composite plate samples are polished with 400#, 600#, 800#, 1000#, 1500#, 2000#, 2500#, 3000# water-grinding sandpaper in sequence, and then mechanically polishing;

[0055] (2) Preparation of etchant 1: Take 4ml of nitric acid and 96ml of alcohol with a mass percentage concentration of 80%, slowly pour the measured nitric acid solution into a glass container filled with alcohol along the container wall, and stir evenly with a glass rod ;

[0056] (3) Spray the mechanically polished sample with the etchant 1 prepared in step (2), and the corrosion residence time is 6s.

[0057] (4) Take out the corroded sample in step (3) from the etchant 1, rinse it with absolute ethanol and dry it.

[0058] (5) Preparation of etchant 2: Weigh 25 g of chromium trioxide and 100 ml of deionized water, pour deionized water and chromium trioxide into a glass container successively, and stir until chromium trioxide is completely dissolved with a ...

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Abstract

The invention discloses an electrolytic corrosion method of a stainless steel / carbon steel composite plate metallographic structure. According to the method, by means of the effects that an alcohol solution with the volume fraction of nitric acid being 2%-10% is used for corroding carbon steel and 5%-60% of a chromic acid solution is used for performing electrolytic corrosion on stainless steel, influences on the metallographic structure of the carbon steel are extremely small while electrolytic corrosion is performed on one side of the stainless steel. The method is good in corrosion effect, and the stainless steel / carbon steel composite plate metallographic structure can be displayed clearly.

Description

technical field [0001] The invention relates to an electrolytic etchant and a corrosion method for the metallographic structure of a stainless steel / carbon steel clad plate, belonging to the technical field of metallographic corrosion. Background technique [0002] The stainless steel / carbon steel composite plate is made of carbon steel as the base plate and stainless steel as the cladding plate through certain methods (hot rolling method, cold rolling method, explosion method, etc.), it has the corrosion resistance and high temperature resistance of stainless steel, It also has the formability, thermal conductivity and weldability of carbon steel. Compared with pure stainless steel, it can save 70% to 80% of precious metal elements such as chromium and nickel, and save costs by 30% to 50%. At present, stainless steel composite panels have been widely used in petroleum, chemical, marine, shipbuilding, metallurgy and other industries. In terms of cost and saving precious me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/06C23F1/28G01N1/32
CPCC23F1/28C25F3/06G01N1/32
Inventor 殷福星代响林刘宝玺马久乐
Owner HEBEI UNIV OF TECH
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