CN113138158B - Corrosion-resistant life prediction method and device for metal material and electronic equipment - Google Patents
Corrosion-resistant life prediction method and device for metal material and electronic equipment Download PDFInfo
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
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Abstract
The invention discloses a method and a device for predicting corrosion-resistant life of a metal material and electronic equipment, wherein the method for predicting the corrosion-resistant life of the metal material comprises the following steps: performing an accelerated corrosion test on a metal material to obtain a first accelerated corrosion rate of the metal material in the accelerated corrosion test; acquiring an acceleration ratio of a standard sample corresponding to the metal material in the accelerated corrosion test to a preset atmospheric corrosion grade; determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio. Therefore, the corrosion-resistant service life evaluation of the metal material under different atmospheric corrosion grades can be realized in a laboratory environment, and the method has easy operability; the service life of materials with different corrosion grades in different atmospheric corrosion environments can be evaluated, such as industrial environments, coastal environments, rural environments and the like.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a method and a device for predicting corrosion-resistant life of a metal material and electronic equipment.
Background
Metallic materials are exposed to the elements for a long period of time and are subject to atmospheric corrosion. Different atmospheric corrosion environments can cause different degrees of corrosion damage to metal materials, thereby affecting the safety, reliability and durability thereof. Therefore, the prediction research on the corrosion total life of the metal material in the atmospheric corrosion environment is necessary, and the method has very important significance on protecting and reasonably utilizing various resources, building a saving type society, realizing sustainable development, reinforcing the corrosion protection of the material and improving the safety service life of the steel structure.
The corrosion resistance of different metal materials is different under different atmospheric corrosion grades, the corrosion resistance is directly reflected as the service life of the materials under different atmospheric corrosion grade environments is also different, the materials have longer corrosion resistant service life under the C1 and C2 environments, the corrosion resistant service life of the materials is shorter above C5 and CX, and whether the materials are applicable under a certain atmospheric corrosion grade environment is always a difficult problem in engineering material selection and corrosion resistance, so how to evaluate the applicability of the metal materials under different atmospheric corrosion environments is also gradually paid attention.
The material corrosion life prediction is to estimate long-term corrosion behavior by short-term corrosion data, estimate general corrosion law of large samples by local sample characteristics, estimate actual environmental material corrosion behavior by simple condition indoor corrosion data, and the like, and form two main supports for corrosion research by the material corrosion life prediction and the corrosion test. In addition, corrosion of metallic materials is affected by various factors such as temperature, humidity, time, etc. The factors are mutually influenced to form an abnormal complex corrosion system, and the conventional method for predicting the corrosion rate by linear fitting and extrapolation through experimental data is difficult to directly establish a definite functional relation, so that the prediction accuracy and the practicability are not ideal.
Therefore, for the problem of corrosion prediction with ambiguity and complexity, the classical prediction method is difficult to play, and a proper method is found to establish a corrosion rate prediction model, so that the prediction of the corrosion life of the metal material is very important.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a device for predicting the corrosion-resistant life of a metal material and electronic equipment, so as to solve the problem that the accuracy and the practicability of the current method for predicting the corrosion-resistant life of the metal material are not ideal.
According to a first aspect, an embodiment of the present invention provides a method for predicting corrosion-resistant life of a metal material, including:
performing an accelerated corrosion test on a metal material to obtain a first accelerated corrosion rate of the metal material in the accelerated corrosion test;
acquiring an acceleration ratio of a standard sample corresponding to the metal material in the accelerated corrosion test to a preset atmospheric corrosion grade;
determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio.
The corrosion-resistant life prediction method for the metal material provided by the embodiment of the invention can realize corrosion-resistant life assessment of the metal material under different atmospheric corrosion grades in a laboratory environment, and has easy operability; the service life of materials with different corrosion grades in different atmospheric corrosion environments can be evaluated, such as industrial environments, coastal environments, rural environments and the like. The method is implemented on the basis of the accelerated corrosion test and the outdoor insolation of the metal standard sample respectively and ensuring that the accelerated corrosion test is consistent with the outdoor insolation corrosion mechanism, so that the method has good accuracy.
With reference to the first aspect, in a first implementation manner of the first aspect, determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio includes:
determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio;
obtaining the thickness of the metal material;
determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the thickness and the first normal corrosion rate.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, before obtaining an acceleration ratio of the accelerated corrosion test to a preset atmospheric corrosion level of the standard sample corresponding to the metal material, the method further includes:
carrying out the accelerated corrosion test on the standard sample to obtain a second accelerated corrosion rate of the standard sample in the accelerated corrosion test;
acquiring a second normal corrosion rate of the standard sample at the atmospheric corrosion level;
and obtaining the acceleration ratio of the standard sample in the accelerated corrosion test to the atmospheric corrosion grade according to the second accelerated corrosion rate and the second normal corrosion rate.
With reference to the first embodiment of the first aspect, in a third embodiment of the first aspect, determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio includes:
determining a first normal corrosion rate of the metal material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio by using a preset first formula;
the first formula is:
wherein the R is i Indicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; said r' a Representing a first accelerated corrosion rate of the metallic material in the accelerated corrosion test; the K is i Indicating the acceleration ratio of the metallic material at the accelerated corrosion test to the atmospheric corrosion grade.
With reference to the first aspect, in a fourth implementation of the first aspect, determining a corrosion life of the metallic material at the atmospheric corrosion level according to the thickness and the first normal corrosion rate includes:
determining the corrosion-resistant life of the metal material at the atmospheric corrosion level by using a preset second formula according to the thickness and the first normal corrosion rate;
the second formula is:
wherein d represents the thickness of the metal material; said d min Representing the minimum thickness allowed by the metallic material; the R is i Indicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; the T is i Indicating the corrosion life of the metallic material at the atmospheric corrosion level.
With reference to the second embodiment of the first aspect, in a fifth embodiment of the first aspect, obtaining an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion level according to the second accelerated corrosion rate and the second normal corrosion rate includes:
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to a preset atmospheric corrosion grade by utilizing a preset third formula according to the second accelerated corrosion rate and the second normal corrosion rate;
the third formula is:
wherein the K is i Representing an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion grade; the r is a Representing a second accelerated corrosion rate of the standard sample in the accelerated corrosion test; the r is i Representing a second normal corrosion rate of the standard specimen at the atmospheric corrosion level.
With reference to the first aspect, in a sixth embodiment of the first aspect, the accelerated corrosion test includes one or more of the following: and (3) a peri-immersion corrosion test, a salt spray corrosion test and a wet heat aging corrosion test.
According to a second aspect, an embodiment of the present invention provides a corrosion-resistant lifetime evaluation device for a metal material, including:
the test module is used for carrying out an accelerated corrosion test on the metal material;
the first acquisition module is used for acquiring a first accelerated corrosion rate of the metal material in the accelerated corrosion test;
the second acquisition module is used for acquiring the acceleration ratio of the standard sample corresponding to the metal material in the accelerated corrosion test to the preset atmospheric corrosion grade;
and the processing module is used for determining the corrosion-resistant service life of the metal material under the atmospheric corrosion grade according to the first accelerated corrosion rate and the acceleration ratio.
According to a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, where the memory and the processor are communicatively connected to each other, and the memory stores computer instructions, and the processor executes the computer instructions, thereby executing the method for predicting corrosion life of a metal material according to the first aspect or any implementation manner of the first aspect.
According to a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where computer instructions are stored, where the computer instructions are configured to cause the computer to perform the method for predicting corrosion life of a metal material according to the first aspect or any implementation manner of the first aspect.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a flow chart of a method for predicting corrosion-resistant life of a metal material in embodiment 1 of the present invention;
FIG. 2 is a schematic representation of the macroscopic morphology of a standard zinc template subjected to a dip test for 15 days;
FIG. 3 is a schematic representation of the macroscopic morphology of a standard zinc template for 1 year in an atmospheric exposure test;
FIG. 4 is a schematic representation of the microscopic corrosion morphology prior to removal of corrosion products from a standard zinc template for 15 days of a dip-through test;
FIG. 5 is a schematic representation of microscopic corrosion morphology after 15 days of a standard zinc template removal corrosion product for a dip-through test;
FIG. 6 is a schematic representation of microscopic corrosion morphology prior to removal of corrosion products from a standard zinc template for 1 year in an atmospheric exposure test;
FIG. 7 is a schematic view of microscopic corrosion morphology after removal of corrosion products from a standard zinc template for 1 year in an atmospheric exposure test;
FIG. 8 is a schematic representation of the sampling ranges of an EDS test for a standard zinc template for 15 days of a weekly leaching test;
FIG. 9 is a graphical representation of the analysis results of the EDS test of a standard zinc template for 15 days of the week's immersion test;
FIG. 10 is a schematic of the sampling range of an EDS test of a standard zinc template for 1 year in an atmospheric exposure test;
FIG. 11 is a graphical representation of the analysis results of an EDS test of a standard zinc template for 1 year in an atmospheric exposure test;
FIG. 12 is a schematic structural view of a corrosion life evaluation device for a metal material in example 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
The embodiment 1 of the invention provides a method for predicting corrosion-resistant life of a metal material. Fig. 1 is a flow chart of a method for predicting corrosion-resistant life of a metal material in embodiment 1 of the present invention, as shown in fig. 1, the method for predicting corrosion-resistant life of a metal material in embodiment 1 of the present invention includes the following steps:
s101: and performing an accelerated corrosion test on the metal material to obtain a first accelerated corrosion rate of the metal material in the accelerated corrosion test.
As a specific embodiment, the accelerated corrosion test comprises one or more of the following: and (3) a peri-immersion corrosion test, a salt spray corrosion test and a wet heat aging corrosion test.
As a specific embodiment, the metal material may be one of carbon steel, zinc, aluminum, and copper or one of zinc, aluminum, and copper as a protective layer.
S102: and acquiring the acceleration ratio of the standard sample corresponding to the metal material in the accelerated corrosion test to a preset atmospheric corrosion grade.
In example 1 of the present invention, the corrosion mechanism of the standard sample after the accelerated corrosion test is identical to that of the standard sample for the atmospheric exposure test at the atmospheric corrosion level, for example, the corrosion mechanism of the standard sample after the accelerated corrosion test is identical to that of the standard sample for one year or more at the atmospheric exposure test at the atmospheric corrosion level. As a specific embodiment, the determination of the accelerated corrosion test conditions may be performed by the following method: and testing the polarization curves of the standard metal samples under different conditions by adopting a single factor (such as temperature, pH and test solution solubility) variable method, and judging whether the corrosion mechanism is changed or not according to the change condition of the corrosion characteristics. And when the corrosion characteristics change, judging that the corrosion mechanism changes, thereby determining a condition range, and selecting the test conditions within the condition range.
As a specific embodiment, before obtaining an acceleration ratio of the standard sample corresponding to the metal material in the accelerated corrosion test to a preset atmospheric corrosion level, the acceleration ratio may be determined by (11) performing the accelerated corrosion test on the standard sample to obtain a second accelerated corrosion rate of the standard sample in the accelerated corrosion test; (12) Acquiring a second normal corrosion rate of the standard sample at the atmospheric corrosion level; (13) And obtaining the acceleration ratio of the standard sample in the accelerated corrosion test to the atmospheric corrosion grade according to the second accelerated corrosion rate and the second normal corrosion rate.
Specifically, the step (13) may obtain the speed ratio of the standard sample in the accelerated corrosion test to the speed ratio in the atmospheric corrosion level according to the second accelerated corrosion rate and the second normal corrosion rate by adopting the following scheme:
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to a preset atmospheric corrosion grade by utilizing a preset third formula according to the second accelerated corrosion rate and the second normal corrosion rate;
the third formula is:
wherein the K is i Representing an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion grade; the r is a Representing a second accelerated corrosion rate of the standard sample in the accelerated corrosion test; the r is i Representing a second normal corrosion rate of the standard specimen at the atmospheric corrosion level.
The standard sample has a second normal corrosion rate r at the atmospheric corrosion level i May be a range of values, that is, r i An upper limit value r of a second normal corrosion rate of the standard sample at the atmospheric corrosion level iup And a lower limit value r of a second normal corrosion rate of the standard sample at the atmospheric corrosion level ilow . Correspondingly, K i Including a lower limit K of the acceleration ratio of the standard sample in the accelerated corrosion test and at the atmospheric corrosion level ilow And the upper limit K of the acceleration ratio of the standard sample in the accelerated corrosion test and the atmospheric corrosion grade iup 。
That is, the acceleration ratio range of the standard sample at the accelerated corrosion test and at the atmospheric corrosion level can be calculated as follows.
Wherein:
K iup representing an upper limit of the acceleration ratio of the standard specimen at the accelerated corrosion test and at the atmospheric corrosion level;
K ilow representing a lower limit of an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion grade;
r iup an upper limit value representing a second normal corrosion rate of the standard sample at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
r ilow A lower limit value representing a second normal corrosion rate of the standard sample at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
r a Represents the second accelerated corrosion rate of the standard sample in the accelerated corrosion test, μm/a or g/(m) 2 ·a)。
S103: determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio.
As a specific embodiment, determining the corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio may be as follows:
(21) Determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio;
(22) Obtaining the thickness of the metal material;
(23) Determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the thickness and the first normal corrosion rate.
More specifically, the determining, in the step (21), the first normal corrosion rate of the metallic material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio may be as follows:
determining a first normal corrosion rate of the metal material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio by using a preset first formula;
the first formula is:
wherein the R is i Indicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; said r' a Representing a first accelerated corrosion rate of the metallic material in the accelerated corrosion test; the K is i Indicating the acceleration ratio of the metallic material at the accelerated corrosion test to the atmospheric corrosion grade.
The acceleration ratio K of the metal material in the accelerated corrosion test and the atmospheric corrosion grade i May be a range of values, that is, K i Including the upper limit K of the acceleration ratio of the metal material in the accelerated corrosion test and the atmospheric corrosion grade iup And a lower limit R of the acceleration ratio of the metal material in the accelerated corrosion test to the atmospheric corrosion level ilow . Correspondingly, R i Includes a first lower normal corrosion rate limit R of the metallic material at the atmospheric corrosion level ilow And a first upper normal corrosion rate limit R for the metallic material at the atmospheric corrosion level iup 。
That is, the first normal corrosion rate of the metallic material at the atmospheric corrosion level can be obtained by the following formula:
wherein:
R iup represents the upper limit of the first normal corrosion rate of the metallic material at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
R ilow Represents a first normal corrosion rate lower limit of the metallic material at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
K iup Representing an upper limit of the acceleration ratio of the metallic material at the accelerated corrosion test to the atmospheric corrosion level;
K ilow representing a lower limit of an acceleration ratio of the metallic material at the accelerated corrosion test to the atmospheric corrosion grade;
r’ a represents a first accelerated corrosion rate of the metal material in the accelerated corrosion test, μm/a or g/(m) 2 ·a)。
More specifically, the determining, in step (23), the corrosion-resistant lifetime of the metal material at the atmospheric corrosion level according to the thickness and the first normal corrosion rate may adopt the following technical scheme:
determining the corrosion-resistant life of the metal material at the atmospheric corrosion level by using a preset second formula according to the thickness and the first normal corrosion rate;
the second formula is:
wherein d represents the thickness of the metal material; said d min Representing the minimum thickness allowed by the metallic material; the R is i Indicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; the T is i Indicating the corrosion life of the metallic material at the atmospheric corrosion level.
R is as follows i May be a range of values including a first lower normal corrosion rate limit R for the metallic material at the atmospheric corrosion level ilow And a first upper normal corrosion rate limit R for the metallic material at the atmospheric corrosion level iup . Correspondingly, T i Is also a range of values including an upper corrosion life limit T of the metallic material at the atmospheric corrosion level iup And a lower limit T of corrosion life of the metallic material at the atmospheric corrosion level ilow 。
Specifically, the minimum thickness or the minimum thickness of the coating layer can be used as a use limit value, and the corrosion-resistant life of the metal material under the atmospheric corrosion level can be calculated by adopting the following formula:
wherein:
d represents the thickness of the metal material or the thickness of the metal coating layer, and mm;
d min represents the thickness of the metal material or the minimum thickness allowed by the metal coating layer, mm;
R iup represents the upper limit of the first normal corrosion rate of the metallic material at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
R ilow Represents a first normal corrosion rate lower limit of the metallic material at the atmospheric corrosion level, μm/a or g/(m) 2 ·a)；
T iup An upper limit of corrosion life of the metallic material at the atmospheric corrosion level, a;
T ilow indicating the resistance of the metallic material to the atmospheric corrosion levelLower corrosion life, a.
To explain the corrosion-resistant life prediction method of the metal material of embodiment 1 of the present invention in more detail, a specific example is given.
The accelerated corrosion test adopts a peri-immersion test method, and the test conditions are as follows: the temperature is 60 ℃, naCl is 7%, pH is 3.0, one cycle period is 120min, wherein 40min immersion and 80min drying are carried out, the uppermost end of a sample is at least 10mm below the solution level in the immersion stage, the environmental temperature of a test box is reduced to 10-25 ℃, the temperature of the test box is increased to 35-50 ℃ in the drying stage, the humidity of the test box is controlled to be 30-45%, and the test time is 15 days.
Fig. 2 is a schematic diagram of the macro morphology of a standard zinc template subjected to a dip test for 15 days, and fig. 3 is a schematic diagram of the macro morphology of a standard zinc template subjected to an atmospheric exposure test for 1 year. As can be seen from the figures 2 and 3, the corrosion behavior of the standard zinc sample plate for the indoor and outdoor corrosion test research has obvious similarities, and obvious white rust is generated. The macroscopic corrosion appearance is consistent with the color of the corrosion product of the sample throwing test, the macroscopic phenomenon is corroded by using a sample plate seen by eyes, and the surfaces are covered with the white corrosion product.
FIG. 4 is a schematic representation of the microscopic corrosion morphology prior to removal of corrosion products from a standard zinc template for 15 days of a dip-through test; FIG. 5 is a schematic representation of the microscopic corrosion morphology after 15 days of the standard zinc template removal of corrosion products for the dip-cycle test. FIG. 6 is a schematic representation of microscopic corrosion morphology prior to removal of corrosion products from a standard zinc template for 1 year in an atmospheric exposure test; FIG. 7 is a schematic representation of microscopic corrosion morphology after removal of corrosion products by a standard zinc template subjected to an atmospheric exposure test for 1 year. As can be seen from fig. 4 and fig. 6, the corrosion product layer on the surface of the standard sample is thicker after the test of the peripheral immersion acceleration, and the corrosion products on the surface of the standard sample are distributed sporadically and have a sheet connection trend after the test of the peripheral immersion acceleration is carried out for 1 year by the exposure to the atmosphere; after rust removal, the microcosmic corrosion morphology of both fig. 5 and fig. 7 is presented as lamellar uniform corrosion with sporadic corrosion pits. The indoor and outdoor corrosion test mechanism is basically consistent.
The indoor test method of the embodiment 1 of the invention is compared with the outdoor field test in terms of macroscopic morphology, microscopic morphology and corrosion products, and the test method implemented under the condition that the three aspects are consistent ensures that the mechanistically accelerated test is consistent with the outdoor test.
FIG. 8 is a schematic representation of the sampling ranges for an EDS test of a standard zinc template for 15 days of a dip test, with the sampling ranges for the EDS test shown in the block in FIG. 8; fig. 9 is a schematic diagram of the analysis results of EDS test of a standard zinc template for 15 days of the week-leaching test, while table 1 below gives the analysis results of EDS test.
TABLE 1 EDS elemental analysis results (accelerated Corrosion test)
FIG. 10 is a schematic diagram of the sampling ranges of an EDS test for a standard zinc template for 1 year in an atmospheric exposure test, with the sampling ranges of the EDS test shown in the box of FIG. 10; fig. 11 is a schematic diagram of the analysis results of EDS test of standard zinc template for 1 year of atmospheric exposure test, while table 2 below gives the analysis results of EDS test.
TABLE 2 outdoor sample EDS elemental analysis results
As can be seen from fig. 8, 9, 10, 11, table 1 and 2, the main elements of the corrosion products of the standard zinc sample plate of the test sample of the accelerated corrosion test in the immersion and the sample of the sample in the outdoor atmosphere are Zn and O, and the elements and the components of the corrosion products are basically similar with a small amount of Cl and Al, which indicates that the corrosion tests in the indoor and outdoor have consistency.
The corrosion rate obtained by the standard zinc sample plate dip accelerated corrosion test for 15 days is 1.0950 mm.a -1 The rate of zinc at different atmospheric corrosion levels was calculated with reference to table 3, and thus the acceleration ratio ranges for the dip acceleration test are shown in table 4.
TABLE 3 environmental corrosiveness classification at 1 st year of different metal exposure corrosion rates
Specifically, the acceleration ratio ranges of different atmospheric corrosion grades of the zinc standard sample under the test conditions of the accelerated corrosion test are obtained by the following formulas.
For example, for zinc with a corrosion grade of C2, a thicker etch rate is used, with a higher rate than the upper limitI.e. 1.0950 mm.a -1 ÷0.7μm·a -1 = 1564.28, lower limit of the acceleration ratio +.>I.e. 1.0950 mm.a -1 ÷0.1μm·a -1 ＝10950。
TABLE 4 acceleration ratio of Standard Zinc templates in the accelerated Corrosion test by peri-immersion
Two different hot dip galvanized plates A and B are selected, the hot dip galvanizing thickness is 86 mu m, and the test conditions are as follows: the temperature is 60 ℃, naCl is 7%, pH is 3.0, one cycle period is 120min, wherein 40min immersion and 80min drying are carried out, the uppermost end of a sample is at least 10mm below the solution level in the immersion stage, the environmental temperature of a test box is reduced to 10-25 ℃, the temperature of the test box is increased to 35-50 ℃ in the drying stage, the humidity of the test box is controlled to be 30-45%, and the test time is 15 days. After the test, the corrosion rates of the hot galvanized plate A and the hot galvanized plate B are respectively 1.546mm/a and 0.865mm/a, and the corrosion rates under different corrosion grade environments are calculated according to the acceleration ratio shown in Table 4, and are shown in Table 5.
Specifically, the corrosion rate ranges of the hot dip galvanization A and the hot dip galvanization B under different atmospheric corrosion grades are obtained by the following formulas.
I.e. 1.546 mm/a/1564.28 =0.988
I.e. 1.546mm/a 10950=0.141
TABLE 5 sample corrosion rates estimated after accelerated corrosion by immersion for weeks
From table 5, it can be calculated that the life of the hot dip galvanized steel sheet a is about 29 years to 87 years and the life of the hot dip galvanized steel sheet B is about 51.8 years to 155 years in the C3 corrosion grade environment, as required by the minimum allowable thickness of the galvanized layer being 0 mm; in the C4 corrosion grade environment, the service life of the hot dip galvanized steel sheet A is about 29 years to 14.5 years; the service life of the hot dip galvanized steel sheet B is about 25.9 years to 51.8 years.
Example 2
Corresponding to embodiment 1 of the present invention, embodiment 2 of the present invention provides a corrosion-resistant life evaluation device for a metal material. Fig. 12 is a schematic structural diagram of a corrosion-resistant life evaluation device for a metal material in embodiment 2 of the present invention, and as shown in fig. 12, the corrosion-resistant life evaluation device for a metal material in embodiment 2 of the present invention includes a test module 20, a first acquisition module 22, a second acquisition module 24, and a processing module 26.
Specifically, the test module 20 is configured to perform an accelerated corrosion test on a metal material;
a first acquisition module 22 for acquiring a first accelerated corrosion rate of the metallic material in the accelerated corrosion test;
a second acquisition module 24 for acquiring an acceleration ratio of the accelerated corrosion test to a preset atmospheric corrosion level of a standard sample corresponding to the metal material;
a processing module 26 for determining a corrosion life of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio.
The specific details of the corrosion-resistant lifetime evaluation device for metal materials can be understood correspondingly with the corresponding relevant descriptions and effects in the embodiments shown in fig. 1 to 11, and will not be repeated here.
Example 3
Embodiments of the present invention also provide an electronic device that may include a processor and a memory, where the processor and memory may be connected by a bus or other means.
The processor may be a central processing unit (Central Processing Unit, CPU). The processor may also be any other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof.
The memory, as a non-transitory computer readable storage medium, may be used to store a non-transitory software program, a non-transitory computer executable program, and modules, such as program instructions/modules (e.g., the test module 20, the first acquisition module 22, the second acquisition module 24, and the processing module 26 shown in fig. 12) corresponding to the method for predicting corrosion-resistant life of a metallic material in an embodiment of the present invention. The processor executes various functional applications of the processor and data processing by running non-transitory software programs, instructions and modules stored in the memory, that is, the method for predicting corrosion-resistant life of metallic materials in the above method embodiments is implemented.
The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created by the processor, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory may optionally include memory located remotely from the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and when executed by the processor perform the method of corrosion life prediction for metallic materials in the embodiments shown in fig. 1-11.
The details of the electronic device may be understood in reference to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to 12, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (6)
1. The method for predicting the corrosion-resistant life of the metal material is characterized by comprising the following steps of:
performing an accelerated corrosion test on a metal material to obtain a first accelerated corrosion rate of the metal material in the accelerated corrosion test;
acquiring an acceleration ratio of a standard sample corresponding to the metal material in the accelerated corrosion test to a preset atmospheric corrosion grade;
determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level from the first accelerated corrosion rate and the acceleration ratio;
the corrosion mechanism of the standard sample after the accelerated corrosion test is consistent with that of the standard sample of the atmospheric exposure test under the atmospheric corrosion grade;
determining the corrosion life of the metallic material at the atmospheric corrosion level from the first accelerated corrosion rate and the acceleration ratio comprises:
determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio;
obtaining the thickness of the metal material;
determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the thickness and the first normal corrosion rate;
determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio comprises:
determining a first normal corrosion rate of the metal material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio by using a preset first formula;
the first formula is:=/>
wherein the saidIndicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; said->Representing a first accelerated corrosion rate of the metallic material in the accelerated corrosion test; said->Representing the acceleration ratio of a standard sample at the accelerated corrosion test to the atmospheric corrosion grade;
before obtaining the acceleration ratio of the accelerated corrosion test to the preset atmospheric corrosion level of the standard sample corresponding to the metal material, the method further comprises:
carrying out the accelerated corrosion test on the standard sample to obtain a second accelerated corrosion rate of the standard sample in the accelerated corrosion test;
acquiring a second normal corrosion rate of the standard sample at the atmospheric corrosion level;
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to the atmospheric corrosion grade according to the second accelerated corrosion rate and the second normal corrosion rate;
obtaining an acceleration ratio of the standard specimen at the accelerated corrosion test to the atmospheric corrosion level based on the second accelerated corrosion rate and the second normal corrosion rate comprises:
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to a preset atmospheric corrosion grade by utilizing a preset third formula according to the second accelerated corrosion rate and the second normal corrosion rate;
the third formula is:=/>
wherein the saidRepresenting an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion grade; said->Representing a second accelerated corrosion rate of the standard sample in the accelerated corrosion test; said->Representing a second normal corrosion rate of the standard specimen at the atmospheric corrosion level.
2. The method of claim 1, wherein determining a corrosion life of the metallic material at the atmospheric corrosion level based on the thickness and the first normal corrosion rate comprises:
determining the corrosion-resistant life of the metal material at the atmospheric corrosion level by using a preset second formula according to the thickness and the first normal corrosion rate;
the second formula is:=/>
wherein the saidRepresenting the thickness of the metallic material; said->Representing the minimum thickness allowed by the metallic material; said->Indicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; said->Indicating the corrosion life of the metallic material at the atmospheric corrosion level.
3. The method of claim 1, wherein the accelerated corrosion test comprises one or more of the following: and (3) a peri-immersion corrosion test, a salt spray corrosion test and a wet heat aging corrosion test.
4. A corrosion-resistant life evaluation device for a metal material, comprising:
the test module is used for carrying out an accelerated corrosion test on the metal material;
the first acquisition module is used for acquiring a first accelerated corrosion rate of the metal material in the accelerated corrosion test;
the second acquisition module is used for acquiring the acceleration ratio of the standard sample corresponding to the metal material in the accelerated corrosion test to the preset atmospheric corrosion grade;
a processing module for determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio;
the corrosion mechanism of the standard sample after the accelerated corrosion test is consistent with that of the standard sample of the atmospheric exposure test under the atmospheric corrosion grade;
determining the corrosion life of the metallic material at the atmospheric corrosion level from the first accelerated corrosion rate and the acceleration ratio comprises:
determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio;
obtaining the thickness of the metal material;
determining a corrosion-resistant lifetime of the metallic material at the atmospheric corrosion level based on the thickness and the first normal corrosion rate;
determining a first normal corrosion rate of the metallic material at the atmospheric corrosion level based on the first accelerated corrosion rate and the acceleration ratio comprises:
determining a first normal corrosion rate of the metal material at the atmospheric corrosion level according to the first accelerated corrosion rate and the acceleration ratio by using a preset first formula;
the first formula is:=/>
wherein the saidIndicating a first normal corrosion rate of the metallic material at the atmospheric corrosion level; said->Representing a first accelerated corrosion rate of the metallic material in the accelerated corrosion test; said->Indicating that a standard sample is present in the sampleAn acceleration ratio of the accelerated corrosion test to the atmospheric corrosion grade;
before obtaining the acceleration ratio of the accelerated corrosion test to the preset atmospheric corrosion level of the standard sample corresponding to the metal material, the method further comprises:
carrying out the accelerated corrosion test on the standard sample to obtain a second accelerated corrosion rate of the standard sample in the accelerated corrosion test;
acquiring a second normal corrosion rate of the standard sample at the atmospheric corrosion level;
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to the atmospheric corrosion grade according to the second accelerated corrosion rate and the second normal corrosion rate;
obtaining an acceleration ratio of the standard specimen at the accelerated corrosion test to the atmospheric corrosion level based on the second accelerated corrosion rate and the second normal corrosion rate comprises:
obtaining an acceleration ratio of the standard sample in the accelerated corrosion test to a preset atmospheric corrosion grade by utilizing a preset third formula according to the second accelerated corrosion rate and the second normal corrosion rate;
the third formula is:=/>
wherein the saidRepresenting an acceleration ratio of the standard sample at the accelerated corrosion test to the atmospheric corrosion grade; said->Representing a second accelerated corrosion rate of the standard sample in the accelerated corrosion test; said->Representing a second normal corrosion rate of the standard specimen at the atmospheric corrosion level.
5. An electronic device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method for predicting corrosion life of a metallic material according to any one of claims 1-3.
6. A computer-readable storage medium storing computer instructions for causing the computer to execute the metal material corrosion life prediction method according to any one of claims 1 to 3.
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