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A kind of stainless steel metallographic etchant and application method thereof

A technology of stainless steel and corrosive agents, which is applied in the preparation of test samples, instruments, and analysis materials, etc., can solve the problems of over-corrosion of powder metallurgy stainless steel, and achieve a smooth and slow corrosion process

Active Publication Date: 2021-01-26
HANS LASER TECH IND GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a stainless steel metallographic etchant for the above-mentioned defects of the prior art, which overcomes the defect that the surface of the powder metallurgy stainless steel has been over-corroded when the existing etchant corrodes the phase boundary of the deformed stainless steel

Method used

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  • A kind of stainless steel metallographic etchant and application method thereof
  • A kind of stainless steel metallographic etchant and application method thereof

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preparation example Construction

[0031] Furthermore, the embodiment of the present invention also provides a method for preparing the metallographic etchant for stainless steel as described above, which is characterized in that it specifically includes the following steps:

[0032] (1) Add concentrated nitric acid solution into absolute ethanol solution to obtain nitric acid alcohol solution;

[0033] At room temperature, slowly add the concentrated nitric acid solution to the absolute ethanol solution from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the cross section of the solder joint. When the surface of the stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution.

[0034] (2) Add ferric chloride solution to nitric acid alcohol solution to obtain metall...

Embodiment 1

[0047] Slowly add concentrated nitric acid solution with a concentration of 65% to the absolute ethanol solution with a concentration of 99.75% from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the solder joint horizontally When the surface of the powder metallurgy stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution. Wherein, the volume fraction of the concentrated nitric acid solution in the nitric alcohol solution is 14.6%, and the volume fraction of the absolute ethanol solution is 85.4%.

[0048]The ferric chloride solution with a mass fraction of 40% is also slowly added to the above-mentioned nitric acid alcohol solution from less to more. , until the phase boundary of the deformed stainless steel and the grain boun...

Embodiment 2

[0050] Slowly add concentrated nitric acid solution with a concentration of 68% to the absolute ethanol solution with a concentration of 99.8% from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the solder joint horizontally When the surface of the powder metallurgy stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution. Wherein, the volume fraction of the concentrated nitric acid solution in the nitric alcohol solution is 33.3%, and the volume fraction of the absolute ethanol solution is 66.7%.

[0051] The ferric chloride solution with a mass fraction of 58% is also slowly added to the above-mentioned nitric acid alcohol solution from less to more. , until the phase boundary of the deformed stainless steel and the grain boun...

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Abstract

The invention relates to the technical field of metallographic corrosion of stainless steel materials, in particular to a stainless steel metallographic corrosion agent and an application method thereof. The metallographic etchant comprises the following components by volume ratio: 12-25% of concentrated nitric acid solution; 47-70% of absolute ethanol solution; 16-30% of ferric chloride solution, wherein the ferric chloride solution in ferric chloride solution The mass fraction is 40~58%. The phase boundary of the deformed stainless steel and the grain boundary of the powder metallurgy stainless steel can be quickly and clearly displayed through the mutual synergy between different solutions. Compared with the existing dilute aqua regia or ferric chloride etchant, the corrosion process of the etchant of the present application is stable and slow, and it will not cause over-corrosion to the grain boundary of powder metallurgy stainless steel when corroding the phase boundary of deformed stainless steel. The detection of welding quality provides great convenience.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion of stainless steel materials, in particular to a stainless steel metallographic corrosion agent and an application method thereof. Background technique [0002] Ordinary deformed stainless steel refers to stainless steel processed by rolling (hot rolling, cold rolling), stamping, etc. It has high strength, good toughness, excellent corrosion resistance and weldability, and is widely used in the industry. Powder metallurgy stainless steel is stainless steel manufactured by powder metallurgy method (injection molding). The grades of these two stainless steels are the same, but due to their different manufacturing processes, there are also differences in properties. [0003] The stainless steel laser welding process has many advantages such as high strength after welding, small heat-affected zone, beautiful solder joints, high efficiency and easy automation. It has been rapidly deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N21/84G01N1/32
CPCC23F1/28G01N1/32G01N21/84
Inventor 苟军夏丰滨肖华李剑锋王瑾高云峰
Owner HANS LASER TECH IND GRP CO LTD
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