CN117368087A - Corrosion and rust resistance-based metal test piece accelerated corrosion test method - Google Patents
Corrosion and rust resistance-based metal test piece accelerated corrosion test method Download PDFInfo
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Abstract
A corrosion and rust resistance-based accelerated corrosion test method for a metal test piece belongs to the technical field of metal corrosion test and evaluation. In order to simplify the test process and reduce the equipment cost investment, and facilitate batch test, the invention constructs a corrosion-and rust-resistant metal test piece accelerated corrosion test device; adhering a strain gauge to the geometric center position of the sample by using organic glue; placing the sample with the adhered strain gauge between an upper groove threaded rod stress loading clamp and a lower groove fixing clamp, and applying pretightening force to the sample by rotating a nut; connecting a strain gauge with a strain gauge, zeroing the reading of the strain gauge, then rotating a nut, and applying axial tensile stress to the sample, wherein the strain gauge displays the strain value on the current sample; calculating the tensile stress on the test specimen; and integrally placing the sample with the set stress and a simple stress corrosion acceleration test device into a corrosion environment to perform a stress acceleration corrosion test. The invention is suitable for stress acceleration corrosion test tests of various combinations.
Description
Technical Field
The invention belongs to the technical field of metal corrosion testing and evaluation, and particularly relates to a corrosion acceleration testing method for a metal test piece based on corrosion and rust prevention.
Background
In order to embody the development concepts of green energy conservation, emission reduction and consumption reduction, the current high-end manufacturing industry is developed in the directions of forward light weight, electric power, intelligent, networking and sharing. Of these, light weight plays a particularly important role. The weight of the equipment is reduced as much as possible on the premise of ensuring the strength and the safety performance of the high-end equipment, so that the dynamic performance is improved, the consumption is reduced, and the pollution is reduced. Weight reduction depends on material weight reduction and structural weight reduction. The light weight of the material is generally realized by adopting low-density high-specific-strength metal materials, such as aluminum alloy, magnesium alloy, titanium alloy and the like, but the material has the defects of high production cost and high processing and manufacturing difficulty and is not generally applied to main bearing structural members. The structure is light, and although the traditional steel materials are adopted, the structure design of the product can be optimized, such as the reduction of the wall thickness of the product, the increase of the rib plate supporting structure and the like, and various heat processing technologies, such as welding, heat treatment and the like, can be adopted for mass production and manufacture.
The martensitic high-strength steel has excellent mechanical properties and processability, is widely applied to the fields of aerospace, petrochemical industry and the like, and plays an important role in structure weight reduction. Martensitic high strength steels can be broadly divided into two types, martensitic precipitation hardened steels and maraging steels, which have good toughness and good overall properties compared to carbon steels, dual phase steels, austenitic steels, etc., and are widely used for manufacturing important structural members capable of withstanding high stresses.
Structural members made of high-strength metal materials such as martensitic high-strength steel and the like usually have stress (internal stress and external load stress) in the processing and service processes, and particularly have obvious stress concentration phenomenon locally, so that failure and damage are caused. Particularly, the material is combined with corrosive media in the environment to generate stress corrosion, microcracks are formed on the surface of the material, so that the structural part is subjected to stress corrosion cracking, the integrity of the structural part is damaged, the structural part is further subjected to failure, and the structural part of the material subjected to stress corrosion is usually subjected to low-stress brittle fracture. Structural or component durability failure may result from stress corrosion. Such failure is often symptom-free, and sudden failure may occur without any significant plastic deformation, which is sudden and often causes serious safety accidents.
In order to effectively detect the stress corrosion tendency of high-strength metal materials such as martensitic high-strength steel, various testing methods, mainly acceleration testing methods, including a bending beam method, a U-shaped bending method, a uniaxial loading stretching method, a C-shaped ring method and a slow strain rate method, are developed, and the method has the common characteristics of high sample preparation precision, complex testing process, high equipment condition requirement, large input cost and mass testing inconvenience. Therefore, the method has very important value for precisely controlling the stress threshold value required by the stress corrosion of the metal material in the corrosive medium and the influence of different stress values on the accelerated corrosion degree of the metal material in the corrosive medium. Because stress corrosion behavior research requires that a metal material is placed in a corrosion environment for a long time, stress is applied to the metal material for a long time, and mechanical properties such as stretching and fatigue are tested on the metal material after stress corrosion. In the traditional stress corrosion research, stress application is realized through a servo motor or a hydraulic press, a testing method and a testing device are complex, and the testing and evaluation of the stress corrosion tendency for a long time are difficult to realize in a large scale in outdoor atmosphere environment, corrosive solution, salt fog environment and other environment with various corrosive mediums.
Disclosure of Invention
The invention aims to solve the problem of testing stress corrosion tendency of a high-strength metal material by applying stress in a corrosion environment, and provides a corrosion and rust resistance-based metal test piece accelerated corrosion testing method.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a corrosion and rust resistance-based metal test piece accelerated corrosion test method comprises the following steps:
s1, constructing a corrosion acceleration testing device for a metal test piece based on corrosion and rust prevention;
s2, sticking the strain gauge to the geometric center position of the sample by using organic glue;
s3, placing the sample with the adhered strain gauge between an upper groove threaded rod stress loading clamp and a lower groove fixing clamp, and applying pretightening force to the sample by rotating a nut;
s4, connecting the strain gauge with a strain gauge, zeroing the reading of the strain gauge, then rotating a nut, and applying axial tensile stress to the sample, wherein the strain gauge displays the strain value on the current sample;
s5, calculating the tensile stress on the sample;
s6, integrally placing the sample with the set stress and a simple stress corrosion acceleration test device into a corrosion environment to perform a stress acceleration corrosion test.
Further, the device for testing the accelerated corrosion of the metal test piece based on corrosion and rust prevention in the step S1 comprises a limiting beam, an upper groove threaded rod stress loading clamp, a stand column, a lower groove fixing clamp and a base;
install stand, lower groove mounting fixture on the base, spacing crossbeam is connected to the stand upper end, spacing crossbeam and last groove threaded rod stress loading anchor clamps pass through the nut and connect, install the sample between last groove threaded rod stress loading anchor clamps and the lower groove mounting fixture, paste on the sample and have the foil gage, the foil gage is connected to the foil gage.
Further, the lower end of the upright post of the corrosion-accelerating testing device for the metal test piece based on corrosion and rust prevention in the step S1 is tightly connected with the lower groove fixing clamp.
Further, the upper groove threaded rod stress loading clamp based on the corrosion and rust-proof metal test piece accelerated corrosion testing device in the step S1 is made of stainless steel or high-temperature alloy, one end of the upper groove threaded rod stress loading clamp is provided with a threaded rod, the other end of the upper groove threaded rod stress loading clamp is provided with a groove with the same shape as the end part of the test piece, one end of the test piece is fixed by the groove, and tensile stress is applied to the test piece through the groove.
Further, the lower groove fixing clamp of the metal test piece accelerated corrosion testing device based on corrosion and rust prevention in the step S1 is made of stainless steel or high-temperature alloy, the lower groove fixing clamp is in a cuboid shape, two grooves are formed in the cuboid, and the shape of the grooves is consistent with that of the end part of the test piece. The lower groove fixing clamp is fixedly connected with the base and the upright post through bolts
Further, the calculation method in step S5 includes the following steps:
s5.1, obtaining a stress-strain curve of the sample by carrying out a uniaxial tensile test on the sample, and calculating the elastic modulus E of the material by the ratio of the change delta S of the internal stress of the elastic deformation range of the stress-strain curve to the change delta r of the elongation, wherein the calculation expression is as follows:
s5.2, applying tensile stress to the sample by rotating the nut, measuring a real-time strain value epsilon of the sample by a strain gauge on the sample, and then calculating a tensile stress value S suffered by the sample, wherein the calculation expression is as follows:
S＝E×ε。
further, the corrosive environment of step S6 includes one or more of a neutral solution, an acidic solution, a salt spray environment, and an outdoor atmosphere.
The invention has the beneficial effects that:
the corrosion and rust resistance-based metal test piece accelerated corrosion test method can apply stress with different values to high-strength metal materials, and perform stress corrosion tests of one or more combinations of different types of samples, a large number of samples and different stress values in corrosive environments such as neutral solution, acid solution, salt spray environment, outdoor atmosphere environment and the like.
The corrosion and rust resistance-based metal test piece accelerated corrosion testing method provided by the invention has a wide application range, and is used for testing different types of high-strength metal materials, such as steel, aluminum alloy, magnesium alloy, titanium alloy and the like.
The method for testing the accelerated corrosion of the metal test piece based on corrosion and rust prevention can be used for arbitrarily adjusting the value of the applied tensile stress. Because the mode of applying tensile stress by the device is two independent thread self-locking devices, two samples can apply different tensile stress values according to the related requirements of the test. Different kinds of metal material samples can be placed in the same fixture.
The corrosion and rust resistance-based metal test piece accelerated corrosion test method is suitable for stress accelerated corrosion tests of any number of samples, and can be used for performing stress accelerated corrosion test tests of one or more combinations of a large number or a small number and different stress values according to test requirements and multi-type corrosion environments.
Drawings
FIG. 1 is a schematic diagram of a rust and rust-proof accelerated corrosion testing device for a metal test piece according to the present invention;
FIG. 2 shows the stress distribution diagram of a constant stress tensile specimen measured by the test of the present invention, wherein FIG. 2 (a) is 346Map and FIG. 2 (b) is 693Map;
FIG. 3 shows the strain distribution of a constant stress tensile specimen measured by the test of the present invention, wherein FIG. 3 (a) is 346Map and FIG. 3 (b) is 693Map;
FIG. 4 is a diagram of a salt spray box test method of a corrosion and rust-proof metal test piece accelerated corrosion test device according to the invention;
FIG. 5 shows the macroscopic morphology of a constant stress salt spray corrosion sample measured by the test of the invention;
FIG. 6 is a graph showing the stress corrosion acceleration factor as a function of stress measured by the test of the present invention: (a) as-received samples; (b) as-heat-treated samples; (c) a welded sample; (d) welding the heat-treated sample.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations, and the present invention is capable of other embodiments.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
For further understanding of the invention, the following detailed description is to be taken in conjunction with fig. 1-6, in which the following detailed description is given:
the first embodiment is as follows:
an application method of batch test of a simple stress corrosion acceleration test device comprises the following steps:
s1, constructing a corrosion and rust resistance-based metal test piece accelerated corrosion testing device, which comprises a limiting beam 2, an upper groove threaded rod stress loading clamp 3, a stand column 6, a lower groove fixing clamp 7 and a base 8;
install stand 6, lower groove mounting fixture 7 on the base 8, spacing crossbeam 2 is connected to stand 6 upper end, spacing crossbeam 2 and last groove threaded rod stress loading fixture 3 pass through nut 1 and connect, install sample 4 between last groove threaded rod stress loading fixture 3 and the lower groove mounting fixture 7, it has foil gage 5 to paste on the sample 4, foil gage 5 connects strain gauge 9.
Further, the lower end of the upright post 6 is tightly connected with the lower groove fixing clamp 7;
furthermore, the upper groove threaded rod stress loading clamp 3 is made of stainless steel and high-temperature alloy, one end of the upper groove threaded rod stress loading clamp 3 is a threaded rod, the other end of the upper groove threaded rod stress loading clamp is a groove with the same shape as the end of the sample 4, the groove can fix one end of the sample, and tensile stress is applied to the sample 4 through the groove;
further, the lower groove fixing clamp 7 is made of stainless steel and high-temperature alloy, the lower groove fixing clamp 7 is in a cuboid shape, two grooves are formed in the cuboid, and the shape of the grooves is consistent with that of the end part of the sample 4. The lower groove fixing clamp 7 is fixedly connected with the base 8 and the upright post 6 through bolts;
s2, sticking the strain gauge 5 to the geometric center position of the sample 4 by using organic glue;
s3, placing the sample 4 with the attached strain gauge 5 between the upper groove threaded rod stress loading clamp 3 and the lower groove fixing clamp 7, and applying pretightening force to the sample 4 by rotating the nut 1;
s4, connecting the strain gauge 5 with the strain gauge 9, zeroing the reading of the strain gauge 9, then rotating the nut 1, and applying axial tensile stress to the sample 4, wherein the strain gauge 9 displays the strain value on the current sample 4;
s5, calculating the tensile stress on the sample 4;
further, the calculation method in step S5 includes the following steps:
s5.1, obtaining a stress-strain curve of the sample by carrying out a uniaxial tensile test on the sample, and calculating the elastic modulus E of the material by the ratio of the change delta S of the internal stress of the elastic deformation range of the stress-strain curve to the change delta r of the elongation, wherein the calculation expression is as follows:
s5.2, applying tensile stress to the sample by rotating the nut, measuring a real-time strain value epsilon of the sample by a strain gauge on the sample, and then calculating a tensile stress value S suffered by the sample, wherein the calculation expression is as follows:
S＝E×ε。
s6, integrally placing the sample with the set stress and a simple stress corrosion acceleration test device into a corrosion environment to perform a stress acceleration corrosion test;
further, the corrosive environment of step S6 includes one or more of a neutral solution, an acidic solution, a salt spray environment, and an outdoor atmosphere.
The test effect of this embodiment is:
and taking the tensile sample as a stress corrosion study object under a constant stress state, and simulating the stress distribution condition of the sample under the action of external stress by utilizing Ansys in the elastic stress range.
As can be seen from FIG. 2, when 346MPa and 693MPa are applied to the test pieces, respectively, the stress on the test pieces is distributed on the test pieces, but the stress values are concentrated in the parallel position areas of the test pieces relative to other positions. Meanwhile, in the loading process of the tensile stress, the strain of the sample also has a distribution rule similar to the stress, namely, in the parallel position area of the sample, the value of the strain is higher than that of other areas, as shown in fig. 3.
FIG. 5 is a graph of the macroscopic morphology of a constant stress corrosion test specimen. It can be observed from fig. 5 that the corrosion is particularly severe at the gauge length where the stress is concentrated, and that the more severe the corrosion is as the stress increases. The constant stress corrosion period was 168 hours, wherein the sample in an unstressed state was placed in a corrosive environment with the tensile fixture. Table 1 shows the final treatment test results.
TABLE 1 corrosion Rate of samples in corrosive environments under tensile stress
Note that: "YS", "YR", "HJ" and "HR" represent raw, as-heat treated, as-welded and as-heat treated samples, respectively; "0", "1" and "2" represent stress free stress of 346Mpa and 693Mpa, respectively; A. b represents two parallel samples; w (W) 0 、W t The mass of the sample before and after corrosion is respectively shown.
Corrosion Rate (v) was determined by the mass (W) 0 ) Mass after corrosion with the specimen (W t ) The difference divided by the product of the sample corrosion area (S) and the sample corrosion time (t) is calculated as follows:
as is clear from Table 1, in the case where the original sample (YS-0-168-A) was not subjected to stress, the mass before corrosion was 33.1108g, the mass after corrosion was 33.0009g, the corrosion rate was 0.1184, and the corrosion rate acceleration factor was 0.9681. The original sample (YS-1-168-A) under tensile stress of 346MPa was subjected to tensile stress in the same corrosion environment, the mass before corrosion was 32.4601g, the mass after corrosion was 32.3292g, the corrosion rate was 0.1411, and the corrosion rate acceleration factor was 1.1537. When 693Mpa tensile stress was applied to the original specimen, the mass of the original specimen (YS-2-168-A) before corrosion was 33.5373g, the mass after corrosion was 33.3756g, the corrosion rate was 0.1742, and the corrosion rate acceleration factor was 1.4244. The corrosion rate at 346Mpa is about 1.16 times the unstressed in the original state and about 1.43 times the unstressed in 693 Mpa.
The original heat treatment state (YR-0-168-A) has no added stress in the corrosion environment, the mass before corrosion is 42.0349g, the mass after corrosion is 41.9747g, the corrosion rate is 0.0649, and the corrosion rate acceleration factor is 0.9759. The original heat-treated sample (YR-1-168-A) was subjected to tensile stress of 346MPa in the same corrosion environment, the mass before corrosion was 30.8476g, the mass after corrosion was 30.7678g, the corrosion rate was 0.0859, and the corrosion rate acceleration factor was 1.2917. When a tensile stress of 693MPa was applied to the original heat-treated specimen, the mass of the original heat-treated specimen (YR-2-168-A) before corrosion was 31.0928g, the mass after corrosion was 31.0015g, the corrosion rate was 0.0984, and the corrosion rate acceleration factor was 1.4797. The original heat treated state had an etch rate of about 1.25 times the unstressed at 346Mpa and about 1.52 times the unstressed at 693 Mpa.
The welding state (HJ-0-168-A) has no added stress in the corrosion environment, the mass before corrosion is 31.1384g, the mass after corrosion is 31.0443g, the corrosion rate is 0.0975, and the corrosion rate acceleration factor is 0.9697. A tensile stress of 346MPa was applied to the welded specimen in the same corrosion environment, the mass of the welded specimen (HJ-1-168-A) before corrosion under the tensile stress was 29.1531g, the mass after corrosion was 29.0395g, the corrosion rate was 0.1224, and the corrosion rate acceleration factor was 1.2173. When a tensile stress of 693MPa was applied to the welded specimen, the welded specimen (HJ-2-168-A) under tensile stress had a mass of 27.5375g before corrosion, a mass of 27.3859g after corrosion, a corrosion rate of 0.1634 and a corrosion rate acceleration factor of 1.6251. The corrosion rate at 346Mpa is about 1.22 times the unstressed corrosion rate in the welded state, and at 693Mpa is about 1.61 times the unstressed corrosion rate.
The welding heat treatment state (HR-0-168-A) has no added stress in the corrosion environment, the mass before corrosion is 28.9388g, the mass after corrosion is 28.8667g, the corrosion rate is 0.0777, and the corrosion rate acceleration factor is 0.9842. A tensile stress of 346MPa was applied to the welding heat treated specimen in the same corrosion environment, the mass of the welding heat treated specimen (HR-1-168-A) before corrosion under tensile stress was 28.2861g, the mass after corrosion was 28.1915g, the corrosion rate was 0.1019, and the corrosion rate acceleration factor was 1.2907. When a tensile stress of 693MPa was applied to the weld heat treated specimen, the weld heat treated specimen (HR-2-168-A) under tensile stress had a mass of 28.1593g before corrosion, a mass of 28.0414g after corrosion, a corrosion rate of 0.1270, and a corrosion rate acceleration factor of 1.6086. The corrosion rate of the welding heat treated state is about 1.27 times of the unstressed state at 346Mpa, and the corrosion rate of the welding heat treated state is about 1.62 times of the unstressed state at 693 Mpa. Therefore, the corrosion rate of four martensitic steel samples in different states in a corrosive environment increases with the increase of the tensile stress applied to the samples, and the more serious the corrosion is.
FIG. 6 is a graph of stress corrosion acceleration factor as a function of stress, plotted in Table 1. The tensile stress applied to the ends of the test specimen is plotted as the abscissa and the ratio of the rate of corrosion of the tensile stress test specimen to the rate of corrosion of the unstressed test specimen is plotted as the ordinate.
In summary, it is known that the presence of the applied stress increases the corrosion rate of the sample for martensitic high strength steels, and that the corrosion rate increases with increasing stress levels. The original state sample can be 1.43 times of the stress-free state at maximum; the original heat-treated sample can be 1.52 times as high as the original heat-treated sample in the stress-free state; the maximum welding state sample can be 1.61 times of the stress-free state; the heat treated weld sample may be up to 1.62 times that in the unstressed condition.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the present application has been described hereinabove with reference to specific embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the embodiments disclosed in this application may be combined with each other in any way as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the sake of brevity and saving resources. Therefore, it is intended that the present application not be limited to the particular embodiments disclosed, but that the present application include all embodiments falling within the scope of the appended claims.
Claims (7)
1. The method for testing the accelerated corrosion of the metal test piece based on corrosion and rust prevention is characterized by comprising the following steps of:
s1, constructing a corrosion acceleration testing device for a metal test piece based on corrosion and rust prevention;
s2, sticking the strain gauge (5) to the geometric center position of the sample (4) by using organic glue;
s3, placing the sample (4) with the strain gauge (5) adhered between the upper groove threaded rod stress loading clamp (3) and the lower groove fixing clamp (7), and applying pretightening force to the sample (4) by rotating the nut (1);
s4, connecting the strain gauge (5) with the strain gauge (9), zeroing the reading of the strain gauge (9), then rotating the nut (1) to apply axial tensile stress to the sample (4), and displaying the strain value on the current sample (4) by the strain gauge (9);
s5, calculating the tensile stress on the sample (4);
s6, integrally placing the sample with the set stress and a simple stress corrosion acceleration test device into a corrosion environment to perform a stress acceleration corrosion test.
2. The corrosion and rust-prevention-based metal test piece accelerated corrosion testing method according to claim 1 is characterized in that the corrosion and rust-prevention-based metal test piece accelerated corrosion testing device in the step S1 comprises a limiting beam (2), an upper groove threaded rod stress loading clamp (3), a stand column (6), a lower groove fixing clamp (7) and a base (8);
install stand (6), lower groove mounting fixture (7) on base (8), spacing crossbeam (2) are connected to stand (6) upper end, spacing crossbeam (2) and last groove threaded rod stress loading anchor clamps (3) are connected through nut (1), install sample (4) between last groove threaded rod stress loading anchor clamps (3) and lower groove mounting fixture (7), paste on sample (4) and have foil gage (5), foil gage (5) connect strain gauge (9).
3. The corrosion and rust-prevention-based metal test piece accelerated corrosion testing method according to claim 2, wherein the lower end of the upright post (6) of the corrosion and rust-prevention-based metal test piece accelerated corrosion testing device in the step S1 is tightly connected with the lower groove fixing clamp (7).
4. The corrosion and rust-prevention-based metal test piece accelerated corrosion testing method according to claim 3, wherein the upper groove threads of the corrosion and rust-prevention-based metal test piece accelerated corrosion testing device in the step S1 are made of stainless steel or high-temperature alloy, one end of the upper groove threaded rod stress loading clamp (3) is provided with a threaded rod, the other end of the upper groove threaded rod stress loading clamp is provided with a groove with the same shape as the end of the test piece (4), the groove fixes one end of the test piece (4), and tensile stress is applied to the test piece (4) through the groove.
5. The corrosion and rust-prevention-based metal test piece accelerated corrosion testing method according to claim 4 is characterized in that in the step S1, a lower groove fixing clamp (7) of the corrosion and rust-prevention-based metal test piece accelerated corrosion testing device is made of stainless steel or high-temperature alloy, the lower groove fixing clamp (7) is rectangular, two grooves are formed in the rectangular, the shape of the grooves is consistent with the shape of the end part of the sample (4), and the lower groove fixing clamp (7) is fixedly connected with a base (8) and an upright post (6) through bolts.
6. The method for accelerated corrosion testing of metal test pieces based on corrosion and rust prevention according to claim 5, wherein the calculation method of step S5 comprises the steps of:
s5.1, obtaining a stress-strain curve of the sample by carrying out a uniaxial tensile test on the sample, and calculating the elastic modulus E of the material by the ratio of the change delta S of the internal stress of the elastic deformation range of the stress-strain curve to the change delta r of the elongation, wherein the calculation expression is as follows:
s5.2, applying tensile stress to the sample by rotating the nut, measuring a real-time strain value epsilon of the sample by a strain gauge on the sample, and then calculating a tensile stress value S suffered by the sample, wherein the calculation expression is as follows:
S＝E×ε。
7. the method for accelerated corrosion testing of metal test pieces based on corrosion and rust prevention according to claim 6, wherein the corrosion environment in step S6 comprises one or more of a neutral solution, an acidic solution, a salt spray environment, and an outdoor atmosphere.
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