CN117269030A - Method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under greenhouse - Google Patents
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- 230000001133 acceleration Effects 0.000 title claims abstract description 130
- 230000007797 corrosion Effects 0.000 title claims abstract description 91
- 238000005260 corrosion Methods 0.000 title claims abstract description 91
- 238000001228 spectrum Methods 0.000 title claims abstract description 87
- 230000007613 environmental effect Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 138
- 239000007769 metal material Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 241000197727 Euscorpius alpha Species 0.000 claims description 2
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- 150000002739 metals Chemical class 0.000 claims description 2
- 239000012736 aqueous medium Substances 0.000 claims 1
- 238000004364 calculation method Methods 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000012113 quantitative test Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000010963 304 stainless steel Substances 0.000 description 10
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000010998 test method Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for compiling a greenhouse environment corrosion acceleration environment spectrum and correcting an equivalent acceleration factor, and belongs to the field of metal corrosion tests. The invention collects temperature, relative humidity, dew time and atmospheric pollution medium data, such as Cl ‑ Ion sedimentation rate, cl ‑ Ion concentration, etc., and compiling environmental spectrum under the shed; designing an acceleration test program according to the environmental spectrum under the shed, and compiling an acceleration environmental spectrum; equivalent conversion is carried out on the environmental spectrum under the greenhouse and the accelerated environmental spectrum, and an equivalent acceleration factor alpha is obtained preliminarily 1 The method comprises the steps of carrying out a first treatment on the surface of the Developing a field under-shed test with a period of 1 year and a corresponding acceleration test, and comparing test data; using quantitative test data to correct the equivalent acceleration factor to alpha 2 . The method combines the equivalent folding algorithm and the corrosion degree comparison method, and increases the accuracy of equivalent acceleration factor calculation. The corrected acceleration test can more accurately simulate the corrosion behavior of the metal material under the shed, and is favorable for accurately evaluating the corrosion degree of the metal material under the shed and predicting the corrosion rule.
Description
Technical Field
The invention belongs to the field of metal corrosion tests, and particularly relates to a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse.
Background
Metal corrosion is an unavoidable natural phenomenon, which can lead to material destruction, thereby causing structural damage and functional failure of facility equipment, shortening the service life and causing huge loss to economy. The corrosion test is a common method for researching the corrosion behavior and corrosion rule of metal materials, and can be divided into a field test and an indoor acceleration test. The field test can be divided into a field physical test and a field hanging sheet test, and can be further divided into an outdoor insolation environment and a greenhouse environment according to local environment characteristics.
The corrosion data and characteristics of the metal material in the natural environment can be obtained through the field test, and the corrosion resistance of the metal material in the natural environment is evaluated. The method mainly comprises the following steps: the accelerating test has been developed from the single environmental factor multi-factor composite accelerating test in the current direction. However, the indoor acceleration test has difficult reproduction test results, and poor material corrosion accuracy in the simulated natural environment, and the main reasons are that the acceleration environment spectrum design is not tightly combined with the on-site actual service environment, the equivalent acceleration factor determination method is single, the material classification is not clear, and the equivalent acceleration factor is unreasonable. In a real environment, the corrosion rates of metal in an outdoor insolation environment and in an under-shed environment are greatly different, and the corrosion rates of different types of metal in the two environments are different, sometimes even the corrosion rates are opposite, for example, the corrosion rate of metal A in the outdoor insolation environment is much faster than that in the under-shed environment, and the corrosion rate of metal B in the outdoor insolation environment is much slower than that in the under-shed environment.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems of how to provide a method for compiling a corrosion acceleration environment spectrum and correcting an equivalent acceleration factor of an environment under a greenhouse so as to solve the problems of difficult reproduction test results of an indoor acceleration test and poor material corrosion accuracy under a simulated natural environment.
(II) technical scheme
In order to solve the technical problems, the invention provides a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse, which comprises the following steps:
s1, compiling an environment spectrum under a shed;
s2, designing an acceleration test program according to the environmental spectrum under the shed, and compiling an acceleration environmental spectrum;
s3, carrying out equivalent conversion on the environment spectrum under the greenhouse and the accelerated environment spectrum to preliminarily obtain an equivalent acceleration factor alpha 1 ；
S4, developing an under-shed test and a corresponding acceleration test, and comparing test data;
s5, correcting to obtain equivalent acceleration factor alpha by using quantifiable test data 2 。
(III) beneficial effects
The invention provides a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse, which has the technical effects and advantages that: aiming at the metal materials used in the environment under the greenhouse, a metal corrosion accelerating environment spectrum compiling and equivalent accelerating factor correcting method is provided, the method combines an equivalent folding algorithm and a corrosion degree comparison method, the accuracy of the equivalent accelerating factor is increased, and the method is used for the accelerating test of the metal materials and is beneficial to accurately evaluating the corrosion degree and predicting the corrosion rule of the metal materials in the environment under the greenhouse.
Drawings
FIG. 1 is a diagram of a regional hierarchical environmental annual spectrum under a shed;
FIG. 2 is a graph of the annual spectrum of the atmospheric environment in an area under a certain shed;
FIG. 3 is a periodic acceleration test program and acceleration environment spectrum of the present invention.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples.
The invention aims to mainly aim at metal materials used in the environment under the greenhouse, provides a metal corrosion acceleration environment spectrum compiling and equivalent acceleration factor correcting method, combines an equivalent folding algorithm and a corrosion degree comparison method, increases the accuracy of calculating the equivalent acceleration factor, and can be used for evaluating the corrosion degree and predicting the corrosion rule of the metal materials in the environment under the greenhouse.
The invention relates to the field of metal corrosion tests, in particular to a method for compiling a corrosion acceleration environment spectrum and correcting an equivalent acceleration factor of an environment under a greenhouse. The method mainly comprises the following steps: (1) Collecting temperature, relative humidity, dew time and atmospheric pollution media data, e.g. Cl - Ion sedimentation rate, cl - Ion concentration, etc., and compiling environmental spectrum under the shed; (2) Designing an acceleration test program according to the environmental spectrum under the shed, and compiling an acceleration environmental spectrum; (3) Equivalent conversion is carried out on the environmental spectrum under the greenhouse and the accelerated environmental spectrum, and an equivalent acceleration factor alpha is obtained preliminarily 1 The method comprises the steps of carrying out a first treatment on the surface of the (4) Developing a field under-shed test with a period of 1 year and a corresponding acceleration test, and comparing test data; (5) Correcting the equivalent acceleration factor to alpha by using quantifiable test data 2 . The invention provides a method for compiling a metal corrosion acceleration environment spectrum and correcting equivalent acceleration factors, which combines an equivalent folding algorithm and a corrosion degree comparison method to increaseThe accuracy of the equivalent acceleration factor calculation is added. The corrected acceleration test can more accurately simulate the corrosion behavior of the metal material under the shed, and is favorable for accurately evaluating the corrosion degree of the metal material under the shed and predicting the corrosion rule.
In order to achieve the above purpose, the present invention proposes the following technical solutions:
a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse comprises the following steps:
s1, compiling an environment spectrum under a shed;
s2, designing an acceleration test program according to the environmental spectrum under the shed, and compiling an acceleration environmental spectrum;
s3, carrying out equivalent conversion on the environment spectrum under the greenhouse and the accelerated environment spectrum to preliminarily obtain an equivalent acceleration factor alpha 1 ；
S4, carrying out a test under a shed and a corresponding acceleration test;
s5, correcting to obtain equivalent acceleration factor alpha by using quantifiable test data 2 。
Further, step S1 includes: forming a classified environmental annual spectrum and an atmospheric environmental annual spectrum by collecting the action time of environmental elements such as environmental one-year period temperature, relative humidity, fog, condensation, salt fog and the like under the greenhouse;
further, the design acceleration test procedure of step S2 includes: the test is carried out in a salt fog circulating test box in a salt fog drying and damp-heat circulating mode, the test time T of each cycle is 6 hours or 8 hours, and the salt fog circulating time, the drying time and the damp-heat circulating time of each cycle are determined by referring to the environmental spectrum under the greenhouse. The lower the relative humidity, fog and condensation time is, the lower the drying time is, but the time is generally not less than 30min; the higher the contaminated medium, the higher the salt spray time ratio.
Further, in the salt spray test stage, test conditions are as follows: the temperature is set to 40 ℃, and the solution is 5 percent NaCl and diluted H 2 SO 4 PH=4, the salt fog sedimentation rate is 1-2 ml/(h.80cm) 2 )；
Further, in the drying test stage, the test conditions are as follows: the temperature is set to 60 ℃, and the humidity is less than 30% RH; the salt fog is converted into the drying within 30min, and the drying is converted into the damp-heat within 30min;
further, in the damp heat test stage, the test conditions are as follows: the temperature is 40 ℃ and the humidity is 90% RH.
Further, step S3 performs equivalent conversion on the environmental spectrum under the canopy and the accelerated environmental spectrum, including: based on equivalent folding algorithm, according to the environmental spectrum under the greenhouse, the corrosion current conversion coefficient of the metal material and the standard humid air under different temperature and humidity combinations, the action time of one year of the experiment under the greenhouse is converted into the action time t of the standard humid air 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the accelerating environment spectrum, the corrosion current conversion coefficient of the salt fog solution and the water medium, converting the action time of one cycle of the accelerating test into the action time t of standard humid air 2 . At this time, the number of acceleration test cycles for one year corresponding to the environment under the booth w=t 1 /t 2 Equivalent acceleration factor alpha 1 For the ratio of the test under the shed to the time of the acceleration test, i.e. alpha 1 ＝8760×t 2 /(t 1 ×T)。
Further, the environmental conditions of the standard humid air include: the temperature is 40 ℃ and the humidity is 90% RH. The t is 1 、t 2 T is h, T is the cycle time of the acceleration test per cycle, and the test time of one year is 8760 h.
Further, in step S4, the under-shed test and the corresponding acceleration test are performed, and the comparison test data include: the test period is not less than 4, including 1 month, 3 months, 6 months, 12 months, and not less than 5 per cycle parallel samples. According to the total time of the acceleration test, the sampling period is set corresponding to the test time under the shed, and sampling is generally carried out after the whole cycle period is ended.
Further, the correcting the equivalent acceleration factor by using the quantifiable test data in step S5 includes: the quantifiable test data refers to the weight, corrosion depth, corrosion size, electrochemical impedance and other test data obtained by detection. According to typical corrosion types of metals, uniform corrosion and local corrosion are distinguished, and the equivalent acceleration factors can be corrected according to quantitative test data such as corrosion weightlessness, corrosion depth and the like of in-situ under-shed tests and indoor acceleration tests, so that the acceleration test procedure is optimized.
Example 1:
the embodiment provides a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse.
Step 1: and compiling an environmental spectrum under the shed. The action time of environmental elements such as environmental annual temperature, relative humidity, fog, condensation, salt fog and the like in the environment under the greenhouse is collected to form a classified environmental annual spectrum and an atmospheric environmental annual spectrum, as shown in figures 1 and 2.
Step 2: and designing an acceleration test program and compiling an acceleration environment spectrum. The test object is Q235 steel, the test is carried out in a salt spray-drying-damp-heat circulation mode in a circulating salt spray test box, each cycle time is 6h, and each cycle acceleration test program and acceleration environment spectrum are shown in figure 3.
Step 3: and equivalent conversion is carried out on the environmental spectrum under the greenhouse and the accelerated environmental spectrum. According to the calculation coefficients of Q235 steel humid air and standard humid air in table 1, the annual spectrum of the grading environment of the area under the shed in the figure 1 in the step 1 and the annual spectrum of the atmospheric environment of the area under the shed in the figure 2, the calculation is carried out: the effect of humid air in the environment under the greenhouse on Q235 steel for one year is equivalent to the effect time 1152.7 hours of standard humid air with the temperature of 40 ℃ and the relative humidity of 90%; at Cl - Ion sedimentation rate 0.174 mg/(100 cm) 2 In case d), one year of fog and dew condensation in the under-shed environment corresponds to the standard humid air action time 2100.9 hours, and therefore, one year of under-shed test of Q235 steel corresponds to the standard humid air action time 3253.6 hours.
TABLE 1 coefficient of refraction of humid air versus Standard humid air
Based on equivalent folding algorithm, aiming at Q235 steel, the folding coefficient χ of standard humid air corresponding to 5% NaCl solution 1 A coefficient of refraction χ of 0.314 for standard humid air corresponding to dilute sulfuric acid at ph=4 2 A composite conversion coefficient β=1/(1/χ) of 0.152 1 +1χ 2 ) =0.1024, i.e. the salt spray test phase corresponds to standard humid airWith 9.8h, the test procedure designed according to step 2 corresponds to a 1 cycle acceleration test action of 31.4h under standard humid air. At this time, the Q235 steel corresponds to the acceleration test cycle number w= 3253.6/31.4=103.6 of the environment under the shed for one year, that is, the cyclic salt spray test needs to be performed for 103.6 cycles (about 26 days), the test effect is equivalent to the actual test of the environment under the shed for 1 year, and the initial equivalent acceleration factor alpha 1 14.1.
Step 4: and carrying out a greenhouse test and a corresponding acceleration test. The acceleration test cycle is set to 108 cycles nearby, the sampling detection time is set to 9, 27, 54 and 108 cycles, and then the sampling detection time corresponds to 1 month, 3 months, 6 months and 12 months under the shed respectively, 5 parallel samples are taken every cycle, and the under-shed test and the acceleration test are carried out on site and indoor respectively. And detecting and obtaining data such as weight, macro morphology, micro morphology, corrosion products, electrochemical impedance and the like before and after the test for comparison.
Step 5: the quantifiable test data is used to correct the equivalent acceleration factor. The corrosion type of the Q235 steel is uniform corrosion, the equivalent acceleration factor is corrected by taking the corrosion weight loss of the test piece as a main reference, and the corrosion evaluation of the Q235 steel is carried out by combining morphology data, electrochemical impedance and the like. Comparing the corrosion test data in Table 2, constructing a fitting function corresponding to corrosion weight loss of Q235 steel in the environment under the shed for 12 months, and the indoor acceleration test needs 9.5 days, so that the equivalent acceleration factor can be corrected to alpha 2 The test procedure designed according to step 2 was followed to circulate 38 cycles of the salt spray test, with test effect equivalent to 1 year of actual test in the environment under the booth.
Table 2 average weightlessness list for each test group of q235 steel
Example 2:
step 1: and compiling an environmental spectrum under the shed. The action time of environmental elements such as environmental annual temperature, relative humidity, fog, condensation, salt fog and the like in the environment under the greenhouse is collected to form a classified environmental annual spectrum and an atmospheric environmental annual spectrum, and the annual spectrum diagrams are shown in figures 1 and 2.
Step 2: and designing an acceleration test program and compiling an acceleration environment spectrum. The test object is 304 stainless steel, the test is carried out in a salt fog test box in a salt fog-drying-damp-heat circulation mode, the test time is 6h per cycle, and the test procedure and the accelerated environment spectrum are shown in figure 3 per cycle.
Step 3: and equivalent conversion is carried out on the environmental spectrum under the greenhouse and the accelerated environmental spectrum. According to the calculation coefficients of 304 stainless steel humid air and standard humid air in table 3, the annual spectrum of the grading environment of the area under the shed in the figure 1 in the step 1 and the annual spectrum of the atmospheric environment of the area under the shed in the figure 2, the calculation is carried out: the effect of the humid air in the environment under the greenhouse on the 304 stainless steel is equivalent to the effect time 1187.8 hours of the standard humid air with the temperature of 40 ℃ and the relative humidity of 90%; at Cl - Ion sedimentation rate 0.174 mg/(100 cm) 2 In case d), the mist and dew condensation correspond to a standard humid air action time of 2653.6h, so that the 304 stainless steel is tested under a booth for one year corresponding to a standard humid air action time of 3841.4h.
TABLE 3 coefficient of refraction of humid air versus Standard humid air
Based on equivalent folding algorithm, the folding coefficient χ of standard humid air corresponding to the 5% NaCl solution is calculated for 304 stainless steel 1 A coefficient of refraction χ of 0.104 for standard humid air corresponding to dilute sulfuric acid at ph=4 2 A comprehensive conversion coefficient β=1/(1/χ) of 0.241 1 +1/χ 2 ) =0.0726, i.e. the salt spray test phase per hour corresponds to a standard humid air action of 13.8h, and the test procedure designed according to step 2 corresponds to a 1 cycle acceleration test action of 43.4h under standard humid air. At this time, the 304 stainless steel is tested with respect to the accelerated test cycle number w= 3841.4/43.4=88.5 for one year of the environment under the shed, that is, 88.5 cycles (about 22 days) are required for the cyclic salt spray testThe test effect is equivalent to that of the test under the greenhouse for 1 year, and the initial equivalent acceleration factor alpha 1 16.5.
Step 4: and carrying out a greenhouse test and a corresponding acceleration test. The acceleration test cycle is set to 88 cycles, and after 7, 22, 44 and 88 cycles are set as sampling detection time, the under-shed test and the acceleration test are respectively carried out on site and indoors corresponding to 5 parallel samples of each cycle for 1 month, 3 months, 6 months and 12 months. And detecting before and after the test to obtain data such as corrosion depth, macro morphology, micro morphology, corrosion products, electrochemical impedance and the like.
Step 5: the quantifiable test data is used to correct the equivalent acceleration factor. The 304 stainless steel corrosion type is microporous corrosion, the average corrosion depth of the deepest corrosion at the test piece 5 is taken as a main reference quantity to correct the equivalent acceleration factor, and the corrosion evaluation of the steel is carried out by combining morphology data, electrochemical impedance and the like. Comparing the corrosion test data in Table 4, constructing a fitting function corresponding to the corrosion depth of the greenhouse environment 304 stainless steel for 12 months, and the indoor acceleration test takes 53.26 days, so that the equivalent acceleration factor can be corrected to alpha 2 365/53.26 =6.85, the test procedure designed according to step 2 circulates 213 cycles of the salt spray test, and the 304 stainless steel acceleration test effect is equivalent to the actual test in the environment under the shed for 1 year.
Table 4 list of average weightlessness for each test group of 304 stainless steel
The invention provides a method for compiling environmental corrosion acceleration environmental spectrum and correcting equivalent acceleration factors under a greenhouse, which has the technical effects and advantages that: aiming at the metal materials used in the environment under the greenhouse, a metal corrosion accelerating environment spectrum compiling and equivalent accelerating factor correcting method is provided, the method combines an equivalent folding algorithm and a corrosion degree comparison method, the accuracy of the equivalent accelerating factor is increased, and the method is used for the accelerating test of the metal materials and is beneficial to accurately evaluating the corrosion degree and predicting the corrosion rule of the metal materials in the environment under the greenhouse.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. The method for compiling the environmental corrosion acceleration environmental spectrum and correcting the equivalent acceleration factor under the greenhouse is characterized by comprising the following steps:
s1, compiling an environment spectrum under a shed;
s2, designing an acceleration test program according to the environmental spectrum under the shed, and compiling an acceleration environmental spectrum;
s3, carrying out equivalent conversion on the environment spectrum under the greenhouse and the accelerated environment spectrum to preliminarily obtain an equivalent acceleration factor alpha 1 ；
S4, developing an under-shed test and a corresponding acceleration test, and comparing test data;
s5, correcting to obtain equivalent acceleration factor alpha by using quantifiable test data 2 。
2. The method for compiling and correcting the equivalent acceleration factor for the corrosion acceleration environment spectrum of the environment under a shelter as claimed in claim 1, wherein said step S1 comprises: the action time of environmental elements of the environment of one year period under the greenhouse is collected to form a classified environmental annual spectrum and an atmospheric environmental annual spectrum.
3. The method for compiling and correcting the equivalent acceleration factor for the corrosion acceleration environment spectrum of the environment under a shed as claimed in claim 2, wherein the environment elements include: temperature, relative humidity, fog and condensation and salt fog sedimentation rate.
4. The method for generating the spectrum and correcting the equivalent acceleration factor of the corrosion acceleration environment in the greenhouse according to claim 1, wherein the step S2 of designing the acceleration test program comprises: the test is carried out in a salt fog circulating test box in a salt fog drying and damp-heat circulating mode, the test time T of each cycle is 6 hours or 8 hours, the salt fog circulating time, the drying time and the damp-heat circulating time of each cycle are determined by referring to the environmental spectrum under the greenhouse, and the drying time is not less than 30 minutes.
5. The method for compiling and correcting the equivalent acceleration factor for the corrosion acceleration environment spectrum under a shed as set forth in claim 4, wherein the salt spray test stage is carried out under the following test conditions: the temperature is set to 40 ℃, and the solution is 5 percent NaCl and diluted H 2 SO 4 PH=4, the salt fog sedimentation rate is 1-2 ml/(h.80cm) 2 )。
6. The method for compiling and correcting equivalent acceleration factors for environmental corrosion acceleration spectrum under a greenhouse according to claim 4, wherein the wet heat test stage comprises the following test conditions: the temperature is 40 ℃ and the humidity is 90% RH.
7. The method for compiling and correcting equivalent acceleration factors for environmental corrosion acceleration spectrum under a shed as set forth in claim 4, wherein the drying test stage is carried out under the following test conditions: the temperature is set to 60 ℃, and the humidity is less than 30% RH; and the time from salt fog to drying is within 30min, and the time from drying to damp-heat is within 30min.
8. The method for preparing and correcting the accelerated environmental spectrum and the equivalent acceleration factor of the corrosion under a shed environment according to any one of claims 1 to 7, wherein the step S3 of performing equivalent conversion on the spectrum of the environment under the shed and the spectrum of the accelerated environment comprises the following steps: based on equivalent folding algorithm, according to the environmental spectrum under the greenhouse, the corrosion current conversion coefficient of the metal material and the standard humid air under different temperature and humidity combinations, the action time of one year of the experiment under the greenhouse is converted into the action time t of the standard humid air 1 The method comprises the steps of carrying out a first treatment on the surface of the According to the accelerated environment spectrum and the corrosion current conversion coefficient of the metal material in the salt spray solution and the aqueous medium, converting the action time of one cycle of the accelerated test into the action time t of standard humid air 2 The method comprises the steps of carrying out a first treatment on the surface of the At this time, the number of acceleration test cycles for one year corresponding to the environment under the booth w=t 1 /t 2 Equivalent acceleration factor alpha 1 For the ratio of the test under the shed to the time of the acceleration test, i.e. alpha 1 ＝8760×t 2 /(t 1 X T); the environmental conditions of the standard humid air include: the temperature is 40 ℃, and the humidity is 90% RH; the t is 1 、t 2 T is h, T is the cycle time of the acceleration test per cycle, and the test time of one year is 8760 h.
9. The method for preparing the spectrum of the environment corrosion acceleration environment and correcting the equivalent acceleration factor according to claim 1, wherein the developing the under-canopy test and the corresponding acceleration test in step S4, the comparison test data includes: the on-site hanging test is carried out for one year in the environment under the shed, the test period is not less than 4, including 1 month, 3 months, 6 months and 12 months, and the parallel samples of each period are not less than 5; according to the total time of the acceleration test, the sampling period is set corresponding to the test time under the shed; and detecting and obtaining weight, macro morphology, micro morphology, corrosion products and electrochemical impedance data before and after the test for comparison.
10. The method for preparing the spectrum and correcting the equivalent acceleration factor of the environment corrosion acceleration under a greenhouse according to claim 9, wherein the step S5 specifically comprises: the quantifiable test data refer to weight, corrosion depth, corrosion size and electrochemical impedance data obtained by detection, uniform corrosion and local corrosion are distinguished according to typical corrosion types of metals, and equivalent acceleration factors are corrected through quantifiable test data of on-site under-roof tests and indoor acceleration tests, so that an acceleration test program is optimized.
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