CN115961333A - Metallographic corrosion method for super ferritic stainless steel - Google Patents
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Abstract
A metallographic corrosion method of super ferritic stainless steel belongs to the field of heat treatment. The metallographic corrosive adopted by the corrosion method is oxalic acid aqueous solution or oxalic acid-citric acid aqueous solution, and the corrosion method is electrolytic corrosion. According to the mass percentage, in the oxalic acid water solution, the oxalic acid accounts for 8 to 12 percent, and the balance is water; part of the oxalic acid is replaced by citric acid to form oxalic acid-citric acid aqueous solution. The specific corrosion method comprises the following steps: the metallographic specimen is subjected to traditional grinding and polishing and then serves as an anode, an austenitic stainless steel plate serves as a cathode, and the metallographic specimen is immersed in a metallographic corrosive agent and then subjected to electrolytic corrosion. The adopted metallographic corrosive agent has the advantages of wide raw material source, simple preparation, low cost, convenient operation of the corrosion method, accuracy, controllability, good reproducibility, clean and tidy sample surface and stable and reliable corrosion effect, can quickly, uniformly, clearly and completely display the metallographic structure characteristics of the super ferrite stainless steel at normal temperature, can provide support for formulating a heat treatment system, and provides guarantee for the production, research, development, popularization and application of the steel.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to a metallographic corrosion method for super ferritic stainless steel.
Background
The super ferrite stainless steel has excellent comprehensive performance such as excellent chloride pitting corrosion resistance, stress corrosion resistance and the like and low cost, can be used as a substitute material for expensive alloys such as super austenitic stainless steel, titanium alloy, hastelloy and the like, can be widely applied to harsh corrosion environments such as coastal power station condensers, seawater desalination, chlor-alkali industry and the like, and has wide application prospect and potential commercial value.
The quality of the mechanical property and the corrosion resistance of the metal material is often determined by the microstructure of the metal material, and a reasonable heat treatment process system is an important means for ensuring that the material obtains a good structure, so that the observation of the microstructure and the accurate evaluation of the grain size are particularly important. The proper corrosion method is the key point for obtaining a metallographic microstructure, the super ferrite stainless steel contains extremely high Cr (26-30 wt%) and Mo (1-4 wt%), a compact and corrosion-resistant passive film can be formed on the surface of the stainless steel, so that the super ferrite stainless steel has extremely excellent corrosion resistance, the microstructure is difficult to clearly and completely display, and the conventional corrosive has the defects of complex components, higher cost, complex preparation process, easiness in deterioration, high potential safety hazard, unrepeatable use and the like.
Therefore, it is urgently needed to provide a corrosion method which is simple in preparation of the corrosive agent, convenient and fast in operation of the corrosion method and stable and reliable in corrosion effect for super ferrite stainless steel, provide technical support for formulation of a reasonable heat treatment system, and further provide a solid technical support for production, research, development, popularization and application of the steel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the metallographic corrosion method for the super ferrite stainless steel, which has the advantages of wide raw material source of the metallographic corrosive, simple preparation, low cost, convenient operation, accurate and controllable corrosion, good reproducibility, clean and tidy sample surface, stable and reliable corrosion effect, capability of rapidly, uniformly, clearly and completely displaying the metallographic structure characteristics of the super ferrite stainless steel at normal temperature, technical support for formulating a reasonable heat treatment system, solid guarantee for the production, research, development, popularization and application of the steel, and better economic benefit and application and popularization value.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme:
the invention relates to a metallographic corrosion method of super ferritic stainless steel, which adopts a metallographic corrosive agent which is oxalic acid aqueous solution, wherein the oxalic acid accounts for 8 to 12 percent by mass, and the balance is water; the corrosion method is electrolytic corrosion.
The oxalic acid can be partially replaced by citric acid, preferably, the metallographic corrosive agent is oxalic acid-citric acid aqueous solution, and the oxalic acid accounts for 5-6% by mass, the citric acid accounts for 3-6% by mass, and the balance is water.
The invention relates to a metallographic corrosion method of super ferritic stainless steel, which comprises the following steps:
(1) Pretreatment of samples
Cutting a gold phase sample from a super ferrite stainless steel hot rolled plate, and grinding, polishing, cleaning and drying the surface to be tested of the sample to obtain a sample to be corroded;
(2) Electrolytic corrosion
Taking the surface to be corroded of the sample to be corroded as an anode, connecting the surface to be corroded with the anode of a direct current power supply, taking an austenitic stainless steel plate as a cathode, connecting the surface to be corroded with the cathode of the direct current power supply, and immersing the anode and the cathode into a metallographic corrosive agent of super ferrite stainless steel and keeping the anode and the cathode parallel and opposite; electrifying for corrosion, controlling the voltage to be 2.5-4V, controlling the current to be 0.12-0.18A, and the time to be 35-60 s, cutting off the power supply, taking out the sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air to obtain the super ferrite stainless steel metallographic corrosion sample.
In the step (1), the cutting is performed by using a wire-cut electric discharge machine.
In the step (1), the size of the metallographic specimen of the super ferritic stainless steel is 10 multiplied by 8 multiplied by 4mm.
In the step (1), the grinding is to perform coarse grinding and fine grinding on the surface to be measured of the test sample by using 240#, 400#, 600#, 800#, 1000# and 2000# SiC sand paper; the polishing is to polish the glass substrate on polishing cloth by using 2.5 mu m polishing paste until the surface is bright and has no scratch; the cleaning is washing by using clear water and absolute ethyl alcohol; the drying is drying.
The invention has the beneficial effects that:
the metallographic corrosion method of the super ferritic stainless steel effectively solves the technical problem that the microstructure of the super ferritic stainless steel is difficult to corrode due to strong corrosion resistance. Due to the adoption of the technical scheme, the invention has the following technical effects:
(1) The metallographic corrosive agent has wide raw material source, simple preparation and low cost;
(2) The corrosion method is convenient to operate, safe, efficient, accurate and controllable;
(3) The corrosion effect is stable and reliable, the reproducibility is good, and the corrosion effect is clear and tidy.
Drawings
FIG. 1 is a metallographic photograph of a hot-rolled sample obtained in example 1, at a magnification of 100.
FIG. 2 is a metallographic photograph taken at 100 times magnification of a sample obtained in example 2 in an annealed state incubated at 975 ℃ for 3 min.
FIG. 3 is a metallographic photograph of the sample obtained in example 3 in an annealed state at 975 ℃ for 5min at a magnification of 100.
FIG. 4 is a metallographic photograph of the sample obtained in example 4 in an annealed state at 975 ℃ for 5min at a magnification of 100.
FIG. 5 is a metallographic photograph of a sample obtained in comparative example 1 in an annealed state at 975 ℃ for 5min at a magnification of 100.
FIG. 6 is a metallographic photograph of a sample obtained in comparative example 2 in an annealed state at 975 ℃ for 5min at a magnification of 100.
FIG. 7 is a metallographic photograph of a sample obtained in comparative example 3 in an annealed state at 975 ℃ for 5min at a magnification of 100.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description and the accompanying drawings are used to describe the embodiments of the present invention in detail and completely.
The metallographic corrosion method provided by the invention is suitable for super ferrite stainless steel with strong corrosion resistance, and comprises the following chemical components in percentage by mass: 26 to 30 percent of Cr, 1 to 4 percent of Mo, less than or equal to 0.01 percent of C and N, less than or equal to 0.006 percent of S, less than or equal to 0.006 percent of P, and the balance of Fe. The following examples are provided to illustrate the metallographic etching method and the etching effect provided by the present invention, using samples of super ferritic stainless steel in a hot rolled state and in different annealed states as examples.
Example 1
In the embodiment, hot rolled super ferritic stainless steel is used as a metallographic sample, and the metallographic corrosion method of the super ferritic stainless steel provided by the invention comprises the following specific steps:
(1) Pretreatment of samples
Cutting a sample with the size of 10mm, the width of 8mm and the thickness of 4mm from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on the surface to be measured of the sample by utilizing 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by utilizing 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by utilizing clear water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Mixing according to mass percent, wherein oxalic acid: deionized water =10:90, adding oxalic acid into deionized water, and continuously stirring by using a glass rod until the oxalic acid is completely dissolved to prepare a 10% oxalic acid aqueous solution;
(3) Electrolytic corrosion
Taking the surface to be corroded of the sample as an anode, connecting the surface to be corroded with the anode of a direct current power supply, taking an austenitic stainless steel plate as a cathode, and connecting the surface to be corroded with the cathode of the direct current power supply, wherein the anode and the cathode need to be immersed in a metallographic corrosive agent and are kept parallel and opposite; electrifying to corrode, controlling the voltage to be 3.6V, the current to be 0.17A and the time to be 35s; cutting off a power supply, taking out a sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
The microstructure of the hot-rolled sample is observed by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, as shown in figure 1, the microstructure of the hot-rolled sample can be clearly and completely reflected, and the microstructure consists of a large amount of strip crystals and a small amount of isometric crystals and presents typical hot-rolled microstructure characteristics.
From the test effect of the embodiment, the corrosion method provided by the invention is suitable for preparing the corrosion of the metallographic specimen of the hot-rolled super ferritic stainless steel.
Example 2
In the embodiment, the super ferrite stainless steel in an annealed state, which is kept at 975 ℃ for 3min, is used as a metallographic sample, and the metallographic corrosion method of the super ferrite stainless steel provided by the invention comprises the following specific steps:
(1) Sample pretreatment
Cutting a sample with the size of 10mm, the width of 8mm and the thickness of 4mm from the annealed super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on the surface to be measured of the sample by utilizing 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by utilizing 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by utilizing clear water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Mixing according to the mass percentage, wherein oxalic acid: deionized water =10:90, adding oxalic acid into deionized water, and continuously stirring by using a glass rod until the oxalic acid is completely dissolved to prepare a 10% oxalic acid aqueous solution;
(3) Electrolytic corrosion
Taking the surface to be corroded of the sample as an anode, connecting the surface to be corroded with the anode of a direct current power supply, taking an austenitic stainless steel plate as a cathode, and connecting the surface to be corroded with the cathode of the direct current power supply, wherein the anode and the cathode need to be immersed in a metallographic corrosive agent and are kept parallel and opposite; electrifying to corrode, controlling the voltage at 3.1V, the current at 0.12A and the time at 55s; cutting off a power supply, taking out a sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
The microstructure of the annealed sample is observed by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, as shown in figure 2, the microstructure of the annealed sample can be clearly and completely reflected, consists of a large amount of equiaxed crystals and a small amount of strip-shaped crystals, and has the characteristic of incomplete recrystallization.
From the test effect of the embodiment, the corrosion method provided by the invention is suitable for preparing the metallographic corrosion sample of the annealed super ferritic stainless steel which is not completely recrystallized.
Example 3
In the embodiment, the super ferrite stainless steel in an annealed state which is kept at 975 ℃ for 5min is taken as a metallographic sample, and the metallographic corrosion method of the super ferrite stainless steel provided by the invention is adopted, and the specific steps are as follows:
(1) Sample pretreatment
Cutting a sample with the size of 10mm in length, 8mm in width and 4mm in thickness from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on a to-be-measured surface of the sample by using 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by using 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by using clean water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Mixing according to the mass percentage, wherein oxalic acid: deionized water =10:90, adding oxalic acid into deionized water, and continuously stirring by using a glass rod until the oxalic acid is completely dissolved to prepare a 10% oxalic acid aqueous solution;
(3) Electrolytic etching
The surface to be corroded of the sample is taken as an anode and is connected with the anode of a direct current power supply, an austenitic stainless steel plate is taken as a cathode and is connected with the cathode of the direct current power supply, and the anode and the cathode need to be immersed in a metallographic corrosive agent and are kept parallel and opposite; electrifying to corrode, controlling the voltage at 3.3V, the current at 0.14A and the time at 45s; cutting off a power supply, taking out a sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
The microstructure of the annealed sample is observed by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, as shown in figure 3, the microstructure of the annealed sample can be clearly and completely reflected, consists of isometric crystals and presents the characteristic of complete recrystallization.
From the test effect of the embodiment, the corrosion method provided by the invention is suitable for preparing the metallographic corrosion sample of the fully recrystallized annealed super ferritic stainless steel.
Example 4
In the embodiment, super ferrite stainless steel which is annealed for 5min after being preserved at 975 ℃ is taken as a metallographic sample, and oxalic acid citric acid aqueous solution is taken as a metallographic corrosive agent, and the method comprises the following specific steps:
(1) Sample pretreatment
Cutting a sample with the size of 10mm in length, 8mm in width and 4mm in thickness from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on a to-be-measured surface of the sample by using 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by using 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by using clean water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Mixing according to mass percent, wherein oxalic acid: and (3) citric acid: deionized water =5:5:90, adding oxalic acid and citric acid into deionized water, and continuously stirring by using a glass rod until the oxalic acid and the citric acid are completely dissolved to prepare a mixed solution of the oxalic acid, the citric acid and the deionized water;
(3) Electrolytic corrosion
Taking the surface to be corroded of the sample as an anode, connecting the surface to be corroded with the anode of a direct current power supply, taking an austenitic stainless steel plate as a cathode, and connecting the surface to be corroded with the cathode of the direct current power supply, wherein the anode and the cathode need to be immersed in a metallographic corrosive agent and are kept parallel and opposite; electrifying to corrode, controlling the voltage at 3.2V, the current at 0.12A and the time at 45s; cutting off a power supply, taking out a sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
The microstructure of the annealed sample was observed by a Zeiss observer, zlm type Zeiss metallographic microscope, as shown in fig. 4, the microstructure of the annealed sample was clearly and completely reflected, consisted of equiaxed crystals and exhibited a completely recrystallized characteristic.
From the comparative example test effect, the metallographic etching method using citric acid to replace part of oxalic acid has the same effect as the metallographic etching method provided by the invention, and is also suitable for preparing the metallographic etching sample of the super ferritic stainless steel.
Comparative example 1
In the embodiment, the super ferrite stainless steel which is annealed at 975 ℃ for 5min is taken as a metallographic sample, aqua regia solution is taken as a metallographic corrosive agent for chemical corrosion, and the method comprises the following specific steps:
(1) Sample pretreatment
Cutting a sample with the size of 10mm in length, 8mm in width and 4mm in thickness from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on a to-be-measured surface of the sample by using 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by using 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by using clean water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Mixing according to volume percentage, hydrochloric acid: nitric acid =3:1, slowly adding nitric acid into hydrochloric acid through a glass rod, and continuously stirring the nitric acid and the hydrochloric acid by using the glass rod until the nitric acid and the hydrochloric acid are uniformly mixed to prepare a king water solution;
(3) Chemical etching
Putting the sample into aqua regia solution, soaking for 2min, taking out the sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
The microstructure of the annealed sample is observed by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, as shown in figure 5, although a certain corrosion effect can be obtained by utilizing the corrosion method, the corroded crystal boundary is unclear, the phenomena of uneven corrosion and over corrosion occur, the chemical corrosion time is not easy to control, the solution placed for a long time fails, and the problems of difficulty in metallographic structure observation and grain size statistics are brought.
From the test effect of the comparative example, the effect of chemical corrosion by aqua regia solution is far inferior to the effect of the metallographic corrosion method provided by the invention, and the method is not suitable for preparing the metallographic corrosion sample of the super ferrite stainless steel.
Comparative example 2
In the embodiment, the super ferrite stainless steel which is annealed at 975 ℃ for 5min is taken as a metallographic sample, and a copper sulfate hydrochloric acid aqueous solution is adopted for chemical corrosion, and the method comprises the following specific steps:
(1) Sample pretreatment
Cutting a sample with the size of 10mm, the width of 8mm and the thickness of 4mm from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on the surface to be measured of the sample by utilizing 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by utilizing 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by utilizing clear water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Adding 5g of copper sulfate pentahydrate into 25ml of deionized water, stirring by using a glass rod until the copper sulfate pentahydrate is completely dissolved, then adding 25ml of hydrochloric acid into the copper sulfate aqueous solution, and stirring by using the glass rod until the mixture is uniformly mixed to prepare a copper sulfate hydrochloric acid aqueous solution;
(3) Chemical etching
Placing the sample into a copper sulfate hydrochloric acid aqueous solution, soaking for 5min, taking out the sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
Observing the microstructure of the annealed sample by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, wherein the grain boundary of the super ferritic stainless steel cannot be corroded by adopting the corrosion method as shown in figure 6;
from the test effect of the comparative example, the method of chemical corrosion by using the copper sulfate hydrochloric acid aqueous solution is not suitable for preparing the metallographic corrosion sample of the super ferritic stainless steel.
Comparative example 3
In the embodiment, the super ferrite stainless steel which is annealed at 975 ℃ for 5min is taken as a metallographic sample, and ferric trichloride hydrochloric acid aqueous solution is adopted for chemical corrosion, and the method comprises the following specific steps:
(1) Pretreatment of samples
Cutting a sample with the size of 10mm in length, 8mm in width and 4mm in thickness from a hot-rolled super ferrite stainless steel plate by adopting wire cut electrical discharge machining equipment, performing coarse grinding and fine grinding on a to-be-measured surface of the sample by using 240#, 400#, 600#, 800#, 1000# and 2000# SiC abrasive paper, polishing the sample on polishing cloth by using 2.5 mu m polishing paste until the surface is bright and has no scratch, and washing and drying the sample by using clean water and absolute ethyl alcohol;
(2) Preparation of metallographic corrosive agent
Adding 5g of ferric trichloride into 100ml of deionized water, stirring by using a glass rod until the ferric trichloride is completely dissolved, then adding 50ml of hydrochloric acid into the ferric trichloride aqueous solution, and stirring by using the glass rod until the hydrochloric acid and the ferric trichloride aqueous solution are uniformly mixed to prepare a ferric trichloride hydrochloric acid aqueous solution;
(3) Chemical etching
Putting the sample into ferric trichloride hydrochloric acid aqueous solution, soaking for 5min, taking out the sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air;
(4) Tissue observation
Observing the microstructure of the annealed sample by adopting a Zeiss observer.ZLm type Zeiss metallographic microscope, wherein the crystal boundary of the super-grade ferritic stainless steel cannot be corroded by adopting the corrosion method as shown in figure 7;
from the test effect of the comparative example, the method for carrying out chemical corrosion by adopting the ferric trichloride hydrochloric acid aqueous solution is not suitable for preparing the metallographic corrosion sample of the super ferrite stainless steel.
The above examples illustrate that not all existing metallographic corrosive agents can clearly and completely display the microstructure of super ferrite stainless steel, and through research, after the metallographic corrosive agents (oxalic acid aqueous solution, oxalic acid-citric acid aqueous solution) with wide sources, simple preparation and low cost are adopted for corrosion, the corrosion effect is stable and reliable, the reproducibility is good, and the metallographic corrosive agents are clear and tidy.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
The above embodiments are merely provided to illustrate the technology provided by the present invention, and the content of the present invention is understood and applied by persons skilled in the art, and the present invention is not limited to the technical solutions. It is intended that the appended claims cover all such modifications as fall within the true spirit and scope of the invention.
Claims (10)
1. A metallographic corrosion method of super ferrite stainless steel is characterized in that a metallographic corrosive adopted by the metallographic corrosion method of super ferrite stainless steel is an oxalic acid aqueous solution, wherein the oxalic acid accounts for 8-12% by mass, and the balance is water; the corrosion method is electrolytic corrosion.
2. The method of metallographic corrosion according to claim 1, characterized in that part of the oxalic acid is replaced by citric acid.
3. A metallographic etching method for super ferritic stainless steel according to claim 2, characterized in that the metallographic etchant contains, by mass, 5 to 6% oxalic acid, 3 to 6% citric acid and the balance water.
4. A method of metallographic corrosion of a super ferritic stainless steel according to any of claims 1 to 3, characterized by the following steps:
(1) Sample pretreatment
Cutting a gold phase sample from a super ferrite stainless steel hot rolled plate, and grinding, polishing, cleaning and drying the surface to be tested of the sample to obtain a sample to be corroded;
(2) Electrolytic corrosion
Taking the surface to be corroded of the sample to be corroded as an anode, connecting the surface to be corroded with the anode of a direct current power supply, taking an austenitic stainless steel plate as a cathode, connecting the surface to be corroded with the cathode of the direct current power supply, and immersing the anode and the cathode into a metallographic corrosive agent of super ferrite stainless steel and keeping the anode and the cathode parallel and opposite; electrifying to corrode, controlling the voltage at 2.5-4V, controlling the current at 0.12-0.18A, and the time at 35-60 s, cutting off the power supply, taking out the sample, washing with clear water, washing with absolute ethyl alcohol, and drying with hot air to obtain the super ferrite stainless steel metallographic corrosion sample.
5. The metallographic etching method according to claim 4, wherein said cutting in said step (1) is performed by wire cut electrical discharge machining.
6. A metallographic etching method according to claim 4, characterized in that in said step (1), the size of the metallographic specimen of a super ferritic stainless steel is 10X 8X 4mm.
7. The metallographic corrosion method of super ferritic stainless steel according to claim 4, characterized in that in step (1), the grinding is carried out by coarse grinding and fine grinding of the surface to be tested of the test sample with 240#, 400#, 600#, 800#, 1000# and 2000# SiC sandpaper.
8. The metallographic etching method according to claim 4, wherein in said step (1), said polishing is performed by polishing the super ferritic stainless steel on a polishing cloth with 2.5 μm polishing paste until the surface is bright and free of scratches.
9. The metallographic etching method according to claim 4, wherein said cleaning in step (1) is performed by rinsing with clean water or absolute ethanol.
10. The metallographic etching method according to claim 4, wherein said drying in step (1) is blow-drying.
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