CN112098175A - Preparation method of metal corrosion test sample - Google Patents
Preparation method of metal corrosion test sample Download PDFInfo
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- CN112098175A CN112098175A CN202011042270.0A CN202011042270A CN112098175A CN 112098175 A CN112098175 A CN 112098175A CN 202011042270 A CN202011042270 A CN 202011042270A CN 112098175 A CN112098175 A CN 112098175A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Abstract
The application provides a preparation method of a metal corrosion test sample, which comprises the following steps: injecting a first mixed solution obtained by mixing acrylic powder and an acrylic curing agent solution into a mold box; horizontally placing a corrosion sample on the surface of 70-90% of solid first mixed solution, wherein the corrosion surface of the corrosion sample is away from the surface of the first mixed solution; placing a hollow frame on the upper surface of the corrosion sample, and injecting a second mixed solution formed by mixing acrylic powder and an acrylic curing agent between the hollow frame and a mold box; completely solidifying the first mixed solution and the second mixed solution to obtain a solid sealing element; and taking the solid sealing element out of the die box to obtain a metal corrosion test sample. The technical scheme of the application solves the problem that the accuracy of the corrosion test is influenced because the non-corrosion surface is easy to corrode in the corrosion test of the metal material.
Description
Technical Field
The application relates to the technical field of metal corrosion, in particular to a preparation method of a metal corrosion test sample.
Background
The existing metal corrosion test sample is generally cut into a size that the periphery is slightly larger than the sample size by a plastic adhesive tape, the non-corrosion surface and the edge of the sample to be corroded are wrapped and compacted by the adhesive tape, then the redundant part of the adhesive tape is cut off, the interface of the adhesive tape and the metal is sealed by nail polish, the edge prevents corrosive liquid from entering from the interface, and various corrosion tests can be carried out after drying.
The method of sealing the non-corrosive side and the edge part by using the plastic tape and sealing the interface by using the nail polish has the following disadvantages:
since the metal corrosion test specimen is generally subjected to a heat treatment (e.g., brazing), the surface is not flat. In the subsequent process of sticking the adhesive tape, bubbles are easy to appear. The bubbles are easy to expand or break under the circulation action of the subsequent temperature and the corrosive solution, and the corrosive solution enters the bubbles to cause the corrosion of the non-corrosive surface, thereby affecting the accuracy of the test and even causing the failure of the test.
By adopting the method of edge sealing by nail polish, corrosion solution may leak into the non-corrosion surface due to large surface roughness and poor quality of the sample, so that the non-corrosion surface may be corroded.
The size of a metal corrosion sample is usually rectangular, four sharp right angles of the rectangular sample cannot be completely sealed by a plastic tape sticking method, and leakage is easy to occur at the right angles.
The corrosion test is generally circulated at high temperature and low temperature, and the running period is long, for example, the neutral salt spray corrosion test time of some aluminum alloy heat exchangers requires 6000 hours, and the internal corrosion test temperature is 88 ℃. In high-temperature to low-temperature circulation, corrosive salt solution and long-time corrosion tests, the plastic adhesive tape can age gradually and break finally, so that the corrosive solution flows into a non-corrosive surface.
Because the plastic film is thin and soft, when the fin material with the material thickness of 0.05-0.08 mm is used for a salt spray corrosion test, the sample is easy to deform in the sealing process, and the rigidity which is high enough can not be provided so that the fin and the horizontal direction form an angle of 70 degrees for carrying out the corrosion test.
Defects in the various sample preparation methods as described above may cause damage to the corroded sample from the edge or the non-corroded surface, affect the test accuracy, and even cause the corrosion test to fail.
Disclosure of Invention
The application aims to provide a preparation method of a metal corrosion test sample, and solves the problem that the accuracy of a corrosion test is influenced because the corrosion of an edge part or a non-corrosion surface is easy to occur in the corrosion of the metal material corrosion test sample in high and low temperature circulation, corrosive salt solution and long period.
According to an aspect of the present application, there is provided a method of preparing a metal corrosion test sample, the method comprising:
injecting a first mixed solution obtained by mixing acrylic powder and an acrylic curing agent solution into a mold box; the mold box is made of a silica gel material. The volume ratio of the acrylic powder to the acrylic fixing agent in the first mixed solution is 1: 1-1: 1.5. The thickness of the first mixed solution is 0.5 mm-2 mm. And solidifying the first mixed solution to 70-90% of solid state, wherein the step of standing the first mixed solution for 3-10 min is included.
Horizontally placing a corrosion sample on the surface of 70-90% of solid first mixed solution, wherein the corrosion surface of the corrosion sample is away from the surface of the first mixed solution;
next, placing a hollow frame on the upper surface of the corrosion sample, wherein the edge of the hollow frame is aligned with or positioned within the edge of the corrosion sample; the hollow frame is made of a silica gel material.
Injecting a second mixed solution formed by mixing acrylic powder and an acrylic curing agent between the hollow frame and the mold box; the volume ratio of the acrylic powder to the acrylic fixing agent in the second mixed solution is 1: 1.5-1: 3. The upper surface of the second mixed solution is higher than or aligned with the upper surface of the corrosion sample.
Completely solidifying the first mixed solution and the second mixed solution to obtain a solid sealing element; comprises standing the first mixed solution for 30-50 min.
And taking the corrosion sample and the solid sealing piece adhered to the corrosion sample out of the mold box to obtain a metal corrosion test sample.
According to some embodiments of the present application, the corrosion sample has a corroded side and a non-corroded side, and the thickness is in a range of 0.05-6 mm.
The preparation method of the metal corrosion test sample is simple and convenient to process and quick to operate, and can avoid the sealing problem of the non-corrosion surface and the edge part of the metal corrosion test sample. The acrylic powder and the acrylic curing agent solution have excellent wettability with metal, and can realize seamless and non-porous sealing with the non-corrosion surface of a test sample. The sealing layer formed by solidifying the acrylic powder and the acrylic curing agent solution has good acid resistance, alkali resistance and high temperature resistance (below 100 ℃), and can ensure that the non-corrosion surface of the sealing area is not corroded in the long-term metal corrosion test process. The solidified acrylic powder and acrylic curing agent solution have high strength and rigidity, and can be used for manufacturing a metal corrosion sample of a fin material with the thickness of less than 0.08mm and providing enough rigidity for the metal corrosion sample to erect the fin for testing. The method can be suitable for sealing metal samples with large surface roughness (such as the surfaces of brazing samples) and irregular length and width.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. For a better understanding of the nature and technical content of the present application, reference should be made to the following detailed description and accompanying drawings.
Drawings
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The accompanying drawings, which are incorporated herein and constitute part of this disclosure, serve to provide a further understanding of the disclosure. The exemplary embodiments of the present disclosure and their description are provided to explain the present disclosure and not to limit the present disclosure. In the drawings:
FIG. 1 shows a schematic top view of a metal corrosion test specimen and a preparation mold according to an example embodiment of the present application.
FIG. 2 shows a schematic cross-sectional view of a metal corrosion test specimen and a preparation mold according to an example embodiment of the present application.
FIG. 3 shows a schematic cross-sectional view of a metal corrosion test sample according to an example embodiment of the present application.
List of reference numerals:
100 mould box
200 hollow frame
300 corrosion sample
400 solid state seal
500 etched surface
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The preparation method of the metal corrosion test sample is provided by the application, and the preparation method can be used for corrosion tests of plates, strips and foils. The method can prepare qualified samples with non-corroded surfaces and no corrosion.
According to the technical concept of the application, the sealing solution is injected into the mold box, the sample is placed on the sealing solution, the corrosion surface on the sample is arranged on one surface far away from the sealing solution, the hollow frame is arranged on the periphery of the corrosion surface, the sealing solution is injected between the mold box and the hollow frame again, the sealing solution is solidified after a period of time, and then demolding is carried out, so that the required test sample is obtained.
Hereinafter, a method for preparing a metal corrosion test sample according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a schematic top view of a preparation mold for a metal corrosion test sample according to an exemplary embodiment of the present application. Fig. 2 shows a schematic cross-sectional view of a preparation mold for a metal corrosion test sample according to an example embodiment of the present application. Fig. 3 shows an interface schematic diagram of a test sample of a method of preparing a metal corrosion test sample according to an example embodiment of the present application.
According to some embodiments, a first mixed solution after mixing an acryl powder and an acryl curing agent solution is injected into a mold box. The mold box may be made of a silicone material. The volume ratio of the acrylic powder to the acrylic fixing agent in the first mixed solution is 1: 1-1: 1.5. The thickness of the first mixed solution is 0.5 mm-2 mm.
Then, the first mixed solution is solidified to 70% to 90% solid, for example, the first mixed solution may be solidified by standing the first mixed solution for 3min to 10 min. Then, the corrosion sample is horizontally placed on the surface of the first mixed solution with the solid state of 70% -90%, and the corrosion surface of the corrosion sample is opposite to the surface of the first mixed solution.
Next, a hollow frame was placed on the upper surface of the corrosion sample. The edges of the hollow frame may be aligned with or within the edges of the corrosion sample. According to some embodiments, the hollow frame may be made of a silicone material.
And injecting a second mixed solution formed by mixing acrylic powder and an acrylic curing agent between the hollow frame and the mold box. The volume ratio of the acrylic powder to the acrylic fixing agent in the second mixed solution can be 1: 1.5-1: 3. The upper surface of the second mixed solution may be higher than or aligned with the upper surface of the etching sample.
And completely solidifying the first mixed solution and the second mixed solution to obtain the solid sealing element. According to some embodiments, the first mixed solution and the second mixed solution may be completely solidified by standing the first mixed solution for 30 to 50 min.
And taking the corrosion sample and the solid sealing piece adhered to the corrosion sample out of the mold box to obtain a metal corrosion test sample. According to an example embodiment, since the mold box and the hollow frame are made of silicone rubber and easily deformed, the solid seal can be easily taken out.
Thus, according to the technical scheme of the application, a metal corrosion test sample can be obtained, as shown in fig. 3.
Referring to fig. 3, a metal corrosion test sample according to an example embodiment includes: the corrosion sample has a corrosion surface and a non-corrosion surface, and the thickness range is 0.05 mm-6 mm. And the solid sealing element is adhered to the non-corrosion surface of the corrosion sample, wherein the solid sealing element comprises acrylic powder and an acrylic curing agent.
According to some embodiments, the solid state seal comprises a first portion and a second portion, the first portion being located at a surface opposite the etched face, the second portion being located at the other, non-etched face of the etched sample.
According to some embodiments, the volume ratio of the acrylic powder to the acrylic fixing agent in the first part is 1:1 to 1: 1.5. The volume ratio of the acrylic powder to the acrylic fixing agent in the second part is 1: 1.5-1: 3.
According to the metal corrosion test sample obtained by the preparation method, the non-corrosion surface is adhered to the first mixed solution and the second mixed solution, so that the problem that the accuracy of a corrosion test is influenced because the edge part or the non-corrosion surface is easy to corrode in high-temperature and low-temperature circulation, corrosive salt solution and long-period corrosion of the metal material corrosion test sample is solved.
First embodiment
According to the preparation method of the metal corrosion test sample of the disclosed example embodiment, the steps of the preparation method are that the corrosion sample 300, the mold box 100, the hollow frame 200 and the first mixed solution formed by mixing the acrylic powder and the acrylic curing agent solution are prepared, the first mixed solution 400 is injected into the mold box 100, the corrosion sample 300 is placed on the sealing solution 400, the hollow frame 200 is arranged on the corrosion sample 300, the second mixed solution formed by mixing the acrylic powder and the acrylic curing agent solution is injected again, and finally demolding is performed to obtain the required corrosion test sample. The preparation process will be described in detail below.
The corrosion sample 300 includes a corroded face 500 and a non-corroded face. When the test is carried out, the corrosion surface 500 is exposed to the outside and is fully contacted with the test environment. The non-corrosion surface needs to be covered in a sealing way in order to avoid influencing the test result, thereby achieving the satisfactory test effect.
A mold box 100 is manufactured, and the mold box 100 is shaped as a U-shaped mold box. The material is silica gel.
The mold box 100 includes a base plate and sidewalls that are fixedly secured to the base plate. The thickness of the bottom plate and the side wall is 5 mm. The outer dimensions of the mould box 100 are 112 x 72 x 30 mm.
The size of the die cartridge 100 is larger than the size of the corrosion sample 300 in order to facilitate the sample 300 to be received therein.
A hollow frame 200 is manufactured, wherein the hollow frame 200 is rectangular and is made of silica gel.
The hollow frame 200 includes side walls, no bottom plate and a top cover. The thickness of the side wall is 3 mm. The outer dimensions of the hollow frame 200 are 102 × 62 × 25 mm.
The method comprises the steps of preparing a mixed solution of acrylic powder and an acrylic curing agent, and mixing the mixed solution according to a certain proportion to form a first mixed solution and a second mixed solution of the present disclosure.
Mixing acrylic powder and acrylic curing agent solution in a volume ratio of 1:1.5, and injecting into a mold box 100 to form a first mixed solution with a thickness of 2 mm. The first mixed solution interface is formed parallel to the bottom plate of the mold box 100.
After the first mixed solution injected into the mold box 100 is left for 10 minutes, and when the first mixed solution is 90% solid, the corrosion sample 300 is placed on the first mixed solution, the non-corrosion surface faces the first mixed solution, and the corrosion surface 500 is far away from the first mixed solution.
And preparing a second mixed solution again, and mixing the acrylic powder and the acrylic curing agent solution in a volume ratio of 1:3 to form a second mixed solution.
Then, the hollow frame 200 is centrally placed on the upper surface of the corrosion sample 300 with the edge of the hollow frame aligned with or within the edge of the corrosion sample, and then the second mixed solution having a mixed volume ratio of 1:3 is injected again between the corrosion sample 300 and the mold box 100. The non-etched side of the etched sample 300 was completely covered with the first mixed solution and the second mixed solution to form a perfect barrier. The sealing layer solidified by the mixed solution of the acrylic powder and the acrylic curing agent has the advantages of good wettability, acid resistance, alkali resistance, temperature resistance, high strength and the like.
After the second mixed solution and the first mixed solution injected between the corrosion sample 300 and the mold box 100 are left for 50min again, the solid seal 400 is formed, and the solid seal 400 is completely cured.
And demolding is carried out after the solid-state sealing element 400 is completely cured, and the hollow frame 200 and the completely cured solid-state sealing element 400 are sequentially taken out of the mold box 100, so that the SWAAT corrosion test sample of which the non-corrosion surface of the corrosion sample 300 and the corrosion surface 500 of the corrosion sample 300 are sealed by the solid-state sealing element 400 formed by mixing acrylic powder and an acrylic curing agent solution can be obtained.
According to the preparation method of the metal corrosion test sample, the solidified acrylic powder and acrylic curing agent solution have high strength and rigidity, and the metal corrosion sample of the fin material with the thickness of less than 0.08mm can be prepared, so that the rigidity is high enough to erect the fin for testing. The method can be suitable for sealing metal samples with large surface roughness (such as the surfaces of brazing samples) and irregular length and width.
Second embodiment
According to a method of preparing a metal corrosion test sample according to an exemplary embodiment of the present disclosure, a plurality of corrosion samples 300 are prepared, the corrosion samples 300 having a plate thickness of 6mm and a length and width dimension of 100 × 20 mm.
The corrosion sample 300 includes a corroded face 500 and a non-corroded face. When the test is carried out, the corrosion surface 500 is exposed to the outside and is fully contacted with the test environment. The non-corrosion surface needs to be covered in a sealing way in order to avoid influencing the test result, thereby achieving the satisfactory test effect.
A mold box 100 is manufactured, and the mold box 100 is shaped as a U-shaped mold box. The material is silica gel.
The mold box 100 includes a base plate and sidewalls that are fixedly secured to the base plate. The thickness of the bottom plate and the side wall is 5 mm. The outer dimensions of the mould box 100 are 124 x 44 x 30 mm.
The size of the die cartridge 100 is larger than the size of the corrosion sample 300 in order to facilitate the accommodation of the corrosion sample 300 therein.
A hollow frame 200 is manufactured, wherein the hollow frame 200 is rectangular and is made of silica gel.
The hollow frame 200 includes side walls, no bottom plate and a top cover. The thickness of the side wall is 3 mm. The outer dimensions of the hollow frame 200 are 104 × 24 × 25 mm.
The method comprises the steps of preparing a mixed solution of acrylic powder and an acrylic curing agent, and mixing the mixed solution according to a certain proportion to form a first mixed solution and a second mixed solution of the present disclosure.
Mixing acrylic powder and acrylic curing agent solution in a volume ratio of 1:1, and injecting into a mold box 100 to form a first mixed solution with a thickness of 0.5 mm. The first mixed solution interface is formed parallel to the bottom plate of the mold box 100.
After the first mixed solution injected into the mold box 100 is left for 3min, and when the first mixed solution is 70% solid, the corrosion sample 300 is placed on the first mixed solution, with the non-corrosion surface facing the first mixed solution and the corrosion surface 500 away from the first mixed solution.
And preparing a second mixed solution again, and mixing the acrylic powder and the acrylic curing agent solution in a volume ratio of 1:1.5 to form the second mixed solution.
Then, the hollow frame 200 is placed on the upper surface of the corrosion sample 300 in a centered manner, the edge of the hollow frame is aligned with or located within the edge of the corrosion sample, and then the second mixed solution with the mixing volume ratio of 1:1.5 is injected again between the corrosion sample 300 and the mold box 100. The non-etched side of the etched sample 300 was completely covered with the second mixed solution to form a perfect barrier. The sealing layer solidified by the mixed solution of the acrylic powder and the acrylic curing agent has the advantages of good wettability, acid resistance, alkali resistance, temperature resistance, high strength and the like.
After the second mixed solution and the first mixed solution injected between the corrosion sample 300 and the mold box 100 are left for 30min, the solid seal 400 is formed, and the solid seal 400 is completely cured.
And demolding is carried out after the solid-state sealing element 400 is completely cured, and the hollow frame 200 and the solid-state sealing element 400 are sequentially taken out of the mold box 100, so that an OY corrosion test sample of the solid-state sealing element 400 formed by mixing acrylic powder and acrylic curing agent solution and used for sealing the non-corrosion surface of the corrosion sample 300 and the corrosion surface 500 of the corrosion sample 300 can be obtained.
According to the preparation method of the metal corrosion test sample, the acrylic powder and the acrylic curing agent solution have excellent wettability with metal, and seamless and non-porous sealing with a non-corrosion surface of the test sample can be realized. The sealing layer formed by solidifying the acrylic powder and the acrylic curing agent solution has good acid resistance, alkali resistance and high temperature resistance (below 100 ℃), and can ensure that the non-corrosion surface of the sealing area is not corroded in the long-term metal corrosion test process.
Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A method for preparing a metal corrosion test sample is characterized by comprising the following steps:
injecting a first mixed solution obtained by mixing acrylic powder and an acrylic curing agent solution into a mold box;
solidifying the first mixed solution to 70-90% of solid state;
horizontally placing a corrosion sample on the surface of 70% -90% of solid first mixed solution, wherein the corrosion surface of the corrosion sample is opposite to the surface of the first mixed solution;
placing a hollow frame on the upper surface of the corrosion sample, wherein the edge of the hollow frame is aligned with or positioned in the edge of the corrosion sample;
injecting a second mixed solution formed by mixing acrylic powder and an acrylic curing agent between the hollow frame and the mold box;
completely solidifying the first mixed solution and the second mixed solution to obtain a solid sealing element;
and taking the corrosion sample and the solid sealing piece adhered to the corrosion sample out of the mold box to obtain a metal corrosion test sample.
2. The method for preparing a metal corrosion test sample according to claim 1, wherein the mold box is made of a silicone material.
3. The method for preparing a metal corrosion test sample according to claim 1, wherein the hollow frame is made of a silica gel material.
4. The method of preparing a metal corrosion test specimen according to claim 1, wherein an upper surface of the second mixed solution is higher than or aligned with an upper surface of the corrosion specimen.
5. The method for preparing the metal corrosion test sample according to claim 1, wherein the volume ratio of the acrylic powder to the acrylic fixing agent in the first mixed solution is 1: 1-1: 1.5.
6. The method for preparing a metal corrosion test sample according to claim 1, wherein the thickness of the first mixed solution is 0.5mm to 2 mm.
7. The method for preparing a metal corrosion test sample according to claim 1, wherein the solidifying the first mixed solution to 70-90% solid state comprises:
and standing the first mixed solution for 3-10 min.
8. The method for preparing a metal corrosion test sample according to claim 1, wherein the volume ratio of the acrylic powder to the acrylic fixing agent in the second mixed solution is 1: 1.5-1: 3.
9. The method for preparing a metal corrosion test sample according to claim 1, wherein completely solidifying the first mixed solution and the second mixed solution to obtain a solid seal comprises:
and standing the first mixed solution for 30-50 min.
10. The method of preparing a metal corrosion test sample according to claim 1, wherein the corrosion sample has a corroded side and a non-corroded side; the thickness range is 0.05 mm-6 mm.
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