CN115753576A - Method for judging corrosion characteristics and defects of metal material of power transmission and transformation equipment - Google Patents
Method for judging corrosion characteristics and defects of metal material of power transmission and transformation equipment Download PDFInfo
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Abstract
The invention provides a method for judging corrosion characteristics and defects of a metal material of electric transmission and transformation equipment, wherein a sample material comprises carbon steel, galvanized steel, stainless steel, aluminum and aluminum alloy, the types of the samples comprise a flat plate sample, a tensile sample and an assembly sample, and the assembly sample is a building assembly metal structural part; cleaning, drying and weighing the sample, applying deformation or moment to the assembled sample, performing corrosion test by adopting a periodic infiltration and alternating damp-heat circulation mode, and finally setting reasonable sample acceleration time and sampling period according to sample difference to record and analyze corrosion characteristic parameters. The scheme selects characteristic parameters and characteristic samples which can reflect the corrosion process and corrosion development of the metal materials of the power transmission and transformation equipment, and can accurately judge the corrosion rule of the on-site service equipment component.
Description
Technical Field
The invention relates to the field of research on corrosion of metal materials of power transmission and transformation equipment, in particular to a method for judging corrosion characteristics and defects of the metal materials of the power transmission and transformation equipment.
Background
The metal components of the power transmission and transformation equipment exposed in the atmospheric environment for a long time are subjected to comprehensive action of environmental factors to cause corrosion damage, so that the bearing area loss of the components and the material performance degradation are caused, the service safety of the power transmission and transformation equipment is seriously influenced, and the evaluation of the corrosion safety of the power transmission and transformation equipment depends on the quantification of the corrosion degree of the metal materials. Parameters characterizing the corrosion of metallic materials typically include corrosion morphology (corrosion area), corrosion rate (weight loss, thickness loss), corrosion pits (diameter, depth, number), corrosion product phase, electrochemical parameters, and the like. Furthermore, the metal component also comprises service performance parameters such as mechanical property, electrical property and the like besides the basic corrosion parameters of the metal material. These parameters are continuously changed with the service environment and the corrosion process. The corrosion characteristics and the corrosion defects are important bases for accurately grasping the corrosion process of the metal material and are also basic data for structural member reliability analysis, the development trend of the corrosion process is macroscopically grasped by the corrosion characteristics, the loss of the bearing area of the structural member is reflected, the spatial variability of the corrosion characteristics is reflected by the corrosion defect characteristics, and the mechanical property of the structural member and the reason for the degradation of the conductivity of the conductive member are revealed.
In a national material corrosion database, corrosion characteristic parameters of a metal material are usually recorded as parameters directly related to weight loss and thickness loss, the corrosion thickness loss and weight loss parameters can reflect the development law of carbon steel corrosion, such as uniform corrosion, and the research on the metal corrosion law of local corrosion of aluminum alloy, stainless steel and the like is not consistent. Moreover, the corrosion data of the aluminum alloy and the stainless steel are few in a historical corrosion database, which is not enough for the research of the support regularity. In addition, the power transmission and transformation equipment members are generally affected by factors such as stress, strain and temperature rise in the service process, the corrosion correlation between the conventional accelerated test flat plate sample and the actual equipment members is not clear, the corrosion characteristic data of the flat plate sample has no direct reference function on the service safety of metal members, equipment and facilities, and the corrosion rule of the on-site service equipment members cannot be accurately judged.
Disclosure of Invention
The invention aims to provide a method for judging corrosion characteristics and corrosion defects of metal materials of power transmission and transformation equipment, which can fill the gaps of corrosion data of aluminum alloy and stainless steel of the power transmission and transformation equipment and research the corrosion process of typical power transmission and transformation equipment components.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for judging corrosion characteristics and defects of a metal material of electric transmission and transformation equipment comprises the following steps:
s01) selecting a test sample, wherein the material of the test sample comprises carbon steel (such as Q235 and Q355), galvanized steel (the galvanized thickness is 60-120 μm), stainless steel (such as 304), aluminum and aluminum alloy (the aluminum and the aluminum alloy mostly adopt 1-series and 6-series aluminum alloys such as 1050 and 6063 in the power industry), the type of the test sample comprises a flat plate test sample, the size of the test sample is about (50-100) mm multiplied by 50mm multiplied by (2.0-6.5) mm, the size of the tensile test sample is selected according to related standards, and the test sample is assembled, the assembled test sample is a metal structural part assembled by power transmission and transformation equipment, such as an angle steel bolt connecting test sample, an aluminum stranded wire crimping test sample and the like, and the connecting form and the size are enlarged and reduced according to the actual size or equal proportion of a real part;
the selection of a corrosion sample component with a proper grade of metal material and shape is a precondition for accurately pre-judging the corrosion state and development rule of the power transmission and transformation equipment. The corrosion (defect) characteristic parameters of four materials in a typical atmospheric corrosion environment can be rapidly mastered by a corrosion (defect) characteristic research method, accelerated corrosion research is carried out on a steel member, a stainless steel member and an aluminum alloy conductor, and basic data can be provided for predicting the corrosion life of the power transmission and transformation equipment member. The invention selects carbon steel, hot dip galvanized steel, stainless steel and aluminum alloy conductors, belongs to metal materials for typical power transmission and transformation equipment, and has wide coverage and strong pertinence.
S02) sample pretreatment, cleaning, drying and weighing the sample, and applying deformation or moment to the assembled sample;
s03) carrying out a corrosion test by adopting a periodic infiltration and alternating damp-heat circulation mode;
s04) formulating reasonable sample acceleration time and sampling period according to sample difference, and recording and analyzing corrosion characteristic parameters;
s05) drawing a corrosion parameter development trend, extracting parameters capable of reflecting the corrosion state and the corrosion development process of the metal material of the power transmission and transformation equipment, defining the parameters as corrosion characteristic parameters, and further researching the cause of performance degradation of the corresponding structural part.
Preferably, the carbon steel sample adopts a flat plate sample and a tensile sample, because the carbon steel is mainly used as a bearing component, the mechanical property is the most key index in the service process of the carbon steel; the galvanized steel sample adopts a flat plate sample, a tensile sample and an angle steel assembly sample, the most common application scene of the galvanized steel in the power grid equipment is a power transmission tower, and the angle steel tower is formed by connecting L-shaped angle steel pieces through bolts. In order to take the influence of stress on the corrosion process into consideration, a zinc-plated angle steel bolt connection assembly is used for carrying out a laboratory accelerated corrosion test; the aluminum alloy sample adopts a flat plate sample, a tensile sample, a wiring board sample and an aluminum stranded wire compression joint sample, and an aluminum wiring board is utilized for carrying out a laboratory accelerated corrosion test, so that the influence of an assembly gap on the corrosion process of the aluminum alloy can be considered; the stainless steel sample adopts a flat plate sample, the stainless steel is mostly used as a shell, and the bearing force can be basically ignored, so that the stainless steel material only adopts the flat plate sample; the sample designations and component forms are shown in table 1:
preferably, the surface of the carbon steel sample is coated with a protective coating.
Preferably, the protective coating is painted or galvanized.
Preferably, the deformation or moment is applied to the assembly sample by: and (3) applying a deformation amount of 5-7 mm to the galvanized steel angle steel assembly part so as to better simulate the stress strain state of the on-site iron tower. The aluminum alloy wiring board is applied with a torque of 45N 8729m-50N 8729m, and the actual stress state of the aluminum wiring board can be simulated.
Preferably, the deformation of the galvanized steel angle steel assembly part is realized by fastening two bolts at the bottom and adjusting the screwing degree of the long bolt at the upper end, and the moment of the aluminum alloy wiring board is realized by mutually overlapping two same aluminum alloy boards and fastening the two same aluminum alloy boards through the bolts.
Preferably, the established acceleration time is specifically: as no protective layer is arranged on the surface of the carbon steel, the surface is quickly covered by the rust layer, and the rust layer on the surface becomes thicker and harder from an initial loose state along with the research, so that the internal metal is protected to a certain extent, the rust layer falls off to cause the thinning of a test sample, the corrosion time of 0 to 960h can obviously show the corrosion law of the carbon steel, and the accelerated corrosion time of the carbon steel is selected to be 0 to 960h; the corrosion resistance of the galvanized steel is obviously enhanced due to the protection effect of the surface zinc coating, the surface zinc coating can be obviously thinned by setting the accelerated time of 1500h, even the carbon steel substrate is exposed due to the initial red rust, the corrosion rule of the zinc coating can be comprehensively mastered, and therefore the accelerated corrosion time of the galvanized steel is 0-1500 h; the aluminum alloy and the stainless steel have good corrosion resistance, the corrosion process usually shows pitting development, the progress is slow, and the pitting initiation and development rule can be seen by setting the corrosion time of 0 to 3000h, so the accelerated corrosion time of the aluminum alloy and the stainless steel is selected to be 0 to 3000h.
Preferably, the specified sampling period is specifically: sampling is carried out when carbon steel tests reach 48h, 96h, 240h, 480h and 960h, sampling is carried out when galvanized steel tests reach 96h, 240h, 480h, 960h, 1200h and 1500h, and sampling is carried out when aluminum alloy and stainless steel tests reach 240h, 480h, 960h, 1440h, 1920h, 2400h and 2880 h.
Preferably, the test parameters include: before removing corrosion products, recording macro morphology, weighing, thickness, corrosion products and electrochemical analysis on a flat plate sample and an equipment member, and measuring performance parameters such as on-resistance, conductivity and the like of the equipment member such as an aluminum wiring board. After the corrosion products were cleaned according to the standard, parameters of the sample, such as macroscopic morphology, weight, thickness, etc., were still recorded. The tensile sample is used for detecting tensile strength and elongation after fracture.
By detecting the parameters before rust removal, the development rule of the corrosion parameters before rust removal is obtained, and the development rule is compared with the corrosion parameter rule after rust removal, so that the corrosion weight increase and thickening before rust removal are the same as the change trends of weight loss and thickness loss after rust removal, therefore, the corrosion parameters before rust removal can be used as characteristic parameters to evaluate the corrosion process, the complicated rust removal process is avoided, and the on-site evaluation on the corrosion state of the power transmission and transformation equipment component can be realized. Through the relevance of the equipment components and the material corrosion rule, the accurate judgment of the corrosion state and the corrosion process of the key components of the equipment can be realized, and data support is provided for the prediction of the residual life of the corrosion of the equipment. Thus, a preferred method of assay analysis comprises the steps of: the corrosion rate is used as a corrosion characteristic parameter of the carbon steel, and the corrosion thickening before rust removal or the corrosion thickening after rust removal is used as a corrosion defect characteristic of the carbon steel; taking the Fe/Zn value as a corrosion characteristic parameter of the galvanized steel, and taking the reduction of the thickness of the galvanized layer as a corrosion defect characteristic of the galvanized steel; the parameters of the pitting pits are the corrosion characteristics of aluminum alloy and stainless steel, the corrosion state and the corrosion development process of the metal material of the power transmission and transformation equipment are reflected by the corrosion characteristic trend, and the reason of performance degradation of the corresponding structural part is further researched.
The invention has the advantages that:
(1) The method screens characteristic parameters capable of reflecting the corrosion process and corrosion development of the metal material of the power transmission and transformation equipment, grasps the corrosion development of the power transmission and transformation equipment component, realizes the qualitative and quantitative evaluation of the corrosion process of the power transmission and transformation equipment component, and improves the corrosion resistance efficiency of the equipment;
(2) The material selection covers common power transmission and transformation metal materials such as zinc, aluminum, carbon steel and stainless steel and typical structural members customized by corresponding materials, has wide coverage and strong pertinence, supplements corrosion data of the power transmission and transformation metal materials, and fills the blank of the corrosion data of aluminum alloy and stainless steel of power transmission and transformation equipment;
(3) The corrosion defect characteristics of the metal material of the power transmission and transformation equipment are defined, the basic data can be used for researching the relation between the service performance and the corrosion defects of the power transmission and transformation equipment components, and the criterion is provided for the corrosion failure of the steel structure and the aluminum alloy components.
Drawings
FIG. 1 is a schematic structural view of a galvanized angle steel member according to example 2 of the present invention;
FIG. 2 is a schematic view of an aluminum alloy wiring board structure according to embodiment 3 of the present invention;
FIG. 3 is a graph showing the trend of the corrosion rate in example 1 of the present invention;
FIG. 4 is a graph showing the corrosion weight loss trend of example 1 of the present invention;
fig. 5 is a trend chart of the on-resistance variation according to embodiment 3 of the present invention.
Detailed Description
The technical solution in 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.
Example 1
The sample selection is Q355 carbon steel flat plate and tensile sample, and the size of the flat plate sample is 50mm multiplied by (4.370 to 4.396) mm. Checking the serial number, measuring the initial thickness and weighing; 16 flat samples and 5 tensile samples were prepared for each environment.
The composition of the weekly leaching solution is 3.5% NaCl +0.05% by weight Na 2 SO 4 To simulate the marine atmospheric corrosive environment. The soaking temperature is room temperature (25 ℃ plus or minus 2 ℃), the drying temperature is 70 ℃ plus or minus 2 ℃, and the relative humidity is 50%. Weekly soaking time was 8: 00-6 pm: 00 hours, and circulating once every 1 hour according to the sequence of soaking for 10min to drying for 50 min. 6 in the afternoon: 00-next day 8:00, adopting an alternating damp-heat circulation mode, and setting a program according to 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'.
Samples were taken up to 48h, 96h, 240h, 480h, 960h of the test. At the end of each time period, the sample is removed from the apparatus and the sample is cleaned as thoroughly as possible to avoid continued corrosion of the sample. Taking out 3 flat plate samples in each test cycle, taking 1 micro-morphology for analysis and then storing, taking out corrosion products by using a brush and a scalpel for the other two samples, and bagging for analysis. The corrosion products are then cleaned according to the standard, and the corroded carbon steel sample is placed at room temperature with 500 mL HCl +3.5g hexamethylenetetramine + 1L H 2 And in the rust removing liquid O for 10min. And cleaning with deionized water and blow-drying. Weighing, calculating the corrosion rate and the corrosion thickness reduction. Taking out 1 fixed flat plate sample in each test period for macroscopic photographing analysis, and continuing to participate in the corrosion cycle test after sampling(ii) a 1 tensile sample is taken for tensile strength and elongation after fracture detection.
The corrosion (defect) characteristics of carbon steel were studied. The corrosion rate and the corrosion weight loss trend with time are shown in fig. 3 and 4, respectively. It can be seen that the corrosion rate shows a tendency of increasing in the initial stage and gradually decreasing thereafter, and the corrosion weight loss shows a monotonous rising tendency with the acceleration time. The corrosion rate is taken as the corrosion characteristic parameter of the carbon steel, so that the corrosion state and the corrosion development process of the carbon steel can be accurately reflected. The corrosion weight loss or the corrosion thickness loss is used as the corrosion defect characteristics of the carbon steel, has the same trend with the change of the mechanical property of the tensile sample, and can reveal the reason of the property degradation of the carbon steel structural member.
Example 2
A galvanized steel flat plate sample and an angle steel assembly part are selected as a test object, the structure of the angle steel assembly part is shown in figure 1, the size of the flat plate sample is 50mm multiplied by 50mm, and the thickness of an initial galvanized layer is 89.0-104 mu m. Checking the serial number, the initial thickness and the thickness of the galvanized layer, and weighing; 19 flat samples, 6 tensile samples, 6 angle steel pieces were prepared for each environment. The Fe/Zn ratio was determined before the test.
The composition of the weekly leaching solution is 0.1% of NaCl +1% 3 To simulate the corrosive environment of the industrial atmosphere. The soaking temperature is room temperature (25 ℃ plus or minus 2 ℃), the drying temperature is 45 ℃ plus or minus 2 ℃, and the relative humidity is 50%. Weekly soaking time was 8: 00-6 pm: 00 for 10 hours, and the circulation is performed once every 1 hour according to the sequence of soaking for 10min to drying for 50 min. 6 in the afternoon: 00-next day 8:00, adopting an alternating damp-heat circulation mode, and setting a program according to 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'.
The galvanized steel is sampled when tested for 96h, 240h, 480h, 960h, 1200h and 1500 h. At the end of each time period, the sample is removed from the apparatus and the sample is cleaned as thoroughly as possible to avoid continued corrosion of the sample. Taking out 3 flat plate samples in each test cycle, taking 1 micro-morphology for analysis, then storing, detecting the Fe/Zn ratio in the other two samples, taking out corrosion products by using a brush and a scalpel, and bagging for analysis. Then, the corrosion product is cleaned according to the standard, 250g of aminoacetic acid is added with distilled water to prepare 1000mL of solution, and the solution is at 70 ℃ for 2min-7min. Weighing, measuring thickness, calculating corrosion rate and reducing corrosion thickness. And (3) taking out 1 fixed flat plate sample for macroscopic photographing analysis, and continuously participating in the corrosion cycle test after sampling. And taking out 1 angle steel assembly part in each cycle, observing a corrosion part, photographing, cleaning and weighing, and calculating the corrosion rate.
The corrosion (defect) characteristics of the galvanized steel material and the angle steel piece were studied. The Fe/Zn ratio change rule of the galvanized angle steel member and the flat plate sample is basically consistent in the whole test period, and the Fe/Zn value can be used as the corrosion characteristic parameter of the galvanized steel, so that the corrosion development trend of the galvanized steel can be better reflected. The reduction of the thickness of the galvanized layer is used as the corrosion defect characteristic of the galvanized steel, has the same change trend with the mechanical property of a tensile sample, and can reveal the reason of the performance degradation of the carbon steel structural member.
Example 3
And 1050 selecting an aluminum alloy flat plate sample and a wiring board as test objects. Wiring Board Structure referring to FIG. 2, the flat panel sample size is about 50mm by 50mm (5.06 to 6.01) mm. Checking the serial number, the initial thickness and weighing; 19 flat panel samples, 6 patch panels were prepared for each environment. It is necessary to test the on-resistance of the wiring board before the test.
The composition of the weekly leaching solution is 0.1% of NaCl +1% 3 To simulate the industrial atmospheric corrosive environment. The soaking temperature is room temperature (70 +/-2 ℃), and the running heating state of the wire can be simulated. The drying temperature was 70 ℃. + -. 2 ℃ and the relative humidity was 50%. Weekly soaking time was 8: 00-6 pm: 00 for 10 hours, and the circulation is performed once every 1 hour according to the sequence of soaking for 10min to drying for 50 min. 6 in the afternoon: 00-next day 8:00, adopting an alternating damp-heat circulation mode, and setting a program according to 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'.
The aluminum alloy samples were sampled when tested to 240h, 480h, 960h, 1440h, 1920h, 2400h, 2880 h. At the end of each time period, the sample is removed from the apparatus and the sample is cleaned as thoroughly as possible to avoid continued corrosion of the sample. And 3 flat plate samples are taken out in each test cycle, and 1 flat plate sample is taken for corrosion product and micro-topography analysis. 2 samples are cleaned according to the standard, and the corroded aluminum sample is placed50 mL H at 80 ℃ 3 PO 4 +20g CrO 3 +1 L H 2 And (4) taking out the sample from the rust removing liquid for 5-10min in the rust removing liquid O, immediately washing the sample with clear water, wiping the sample with alcohol, drying the sample, and weighing the sample (to the accuracy of 0.1 mg). The above procedure was repeated until the mass change of the sample was less than 1 mg. And weighing and calculating the average corrosion rate. And (3) taking out 1 fixed flat plate sample for macroscopic photographing analysis, and continuously participating in the corrosion cycle test after sampling. Each cycle, 1 wiring board is taken out to observe the corrosion position, photographed, cleaned and weighed, and the average corrosion rate is calculated.
The corrosion defect characteristics of the aluminum alloy material and the wiring board were studied. The corrosion surface of the aluminum alloy and the component is microscopically detected by a profiler, the corrosion rate does not show a monotonous development trend in the initial corrosion stage, and the pitting corrosion is a main characteristic of the corrosion development of the aluminum alloy and the component, so that the surface roughness is increased. Pitting corrosion gradually progresses with the progress of corrosion, and the diameter, depth, and the like of the pitting pits increase. The on-resistance of the aluminum wiring board also shows a tendency to increase gradually as the etching time is prolonged, as shown in fig. 5. Therefore, the pitting parameters are used as corrosion characteristic and defect characteristic parameters, the corrosion development process of the aluminum alloy can be accurately represented, and certain correlation exists between pitting corrosion and service performance (on-resistance) of the aluminum alloy.
Example 4
A304 stainless steel flat sample is selected as a corrosion sample, and the size of the flat sample is about 50mm multiplied by (1.79 to 1.90) mm. Checking the serial number, the initial thickness and weighing; 19 plate samples were prepared for each environment.
The composition of the weekly leaching solution is 3.5% NaCl +0.05% by weight Na 2 SO 4 To simulate the marine atmospheric corrosive environment. The soaking temperature is room temperature (25 ℃ plus or minus 2 ℃), the drying temperature is 70 ℃ plus or minus 2 ℃, and the relative humidity is 50%. Weekly soaking time was 8: 00-6 pm: 00 for 10 hours, and the circulation is performed once every 1 hour according to the sequence of soaking for 10min to drying for 50 min. 6 in the afternoon: 00-next day 8:00, adopting an alternating damp-heat circulation mode, and setting a program of 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'.
Stainless steelThe steel is sampled when the steel is tested to 240h, 480h, 960h, 1440h, 1920h, 2400h and 2880 h. At the end of each time period, the sample is removed from the apparatus and the sample is cleaned as thoroughly as possible to avoid continued corrosion of the sample. Taking out 3 flat plate samples in each test cycle, taking 1 flat plate sample for corrosion product and micro-topography analysis and storing, cleaning the corrosion products according to the other two samples according to the standard, and placing the corroded stainless steel sample in 100 mL HNO at 60 DEG C 3 +1 L H 2 And O, rust removing for 20min. And weighing and calculating the average corrosion rate. And (3) taking out 1 fixed flat plate sample for macroscopic photographing analysis, and continuously participating in the corrosion cycle test after sampling.
The corrosion (defect) characteristics of stainless steel were investigated. The stainless steel corrosion surface is microscopically detected by a profilometer, and the diameter of a pitting pit is gradually enlarged along with the prolonging of the corrosion time, so that the surface roughness is increased. While corrosion weight loss shows irregular changes. This indicates that pitting is a characteristic parameter of corrosion (defects) in stainless steel materials.
Finally, it should be noted that: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. A method for judging corrosion characteristics and defect characteristics of metal materials of electric transmission and transformation equipment is characterized in that common electric transmission and transformation metal materials and structural parts are screened as samples, the samples comprise carbon steel, galvanized steel, stainless steel, aluminum and aluminum alloy, the corrosion defect characteristic parameter of the carbon steel is corrosion rate, and corrosion thickening before rust removal or corrosion thickening after rust removal is used as the corrosion defect characteristic of the carbon steel; the corrosion characteristic parameter of the galvanized steel is Fe/Zn value, and the reduction of the thickness of the galvanized layer is used as the corrosion defect characteristic of the galvanized steel; the characteristic parameter of the corrosion defect of the aluminum alloy is pit depth; the characteristic parameter of the corrosion defect of the stainless steel is the pit density.
2. The method for judging the corrosion characteristics and the defect characteristics of the metal material of the electric transmission and transformation equipment according to claim 1, which is characterized by comprising the following steps of:
s01) the types of the samples comprise a flat plate sample, a tensile sample and an assembly sample, wherein the assembly sample is an assembly metal structural part for a power transmission and transformation field;
s02) sample pretreatment, cleaning, drying and weighing the sample, and applying deformation or moment to the assembled sample;
s03) carrying out a corrosion test by adopting a periodic infiltration and alternating damp-heat circulation mode;
s04) formulating reasonable sample acceleration time and sampling period according to sample difference, and analyzing corrosion parameters;
s05) drawing a corrosion parameter development trend, extracting parameters capable of reflecting the corrosion state and the corrosion development process of the metal material of the power transmission and transformation equipment, defining the parameters as corrosion characteristic parameters, and further researching the cause of performance degradation of the corresponding structural part.
3. The method for judging the corrosion characteristics and the defect characteristics of the metal material of the electric transmission and transformation equipment according to claim 1, wherein the type selection of the carbon steel is Q235 or Q335; the grade of the aluminum alloy material is selected from 1050, 5A01 and 6063; the stainless steel grade is preferably 304 austenitic stainless steel.
4. The method for determining corrosion characteristics and defect characteristics of a metal material of electric transmission and transformation equipment according to claim 1, wherein the carbon steel sample is a flat plate sample and a tensile sample, the galvanized steel sample is a flat plate sample, a tensile sample and an angle iron assembly sample, the aluminum alloy sample is a flat plate sample, a tensile sample, a wiring board sample and an aluminum stranded wire crimping sample, and the stainless steel sample is a flat plate sample.
5. The method for judging the corrosion characteristics and the defect characteristics of the metal material of the electric transmission and transformation equipment as claimed in claim 2, wherein the mode of applying deformation or moment to the assembly sample is as follows: and applying a deformation amount of 5-7 mm to the galvanized steel angle steel assembly part, and applying a torque of 45N 8729m-50N 8729m to the aluminum alloy wiring board.
6. The method for judging the corrosion characteristics and the defect characteristics of the metal materials of the electric transmission and transformation equipment as claimed in claim 2, wherein the deformation of the galvanized steel angle steel assembly part is realized by fastening two bolts at the bottom and adjusting the screwing degree of the long bolt at the upper end, and the torque of the aluminum alloy wiring board is realized by mutually overlapping two same aluminum alloy boards and fastening the aluminum alloy boards through the bolts.
7. The method for determining the corrosion characteristics and the defect characteristics of the metal material of the electric transmission and transformation equipment according to claim 2, wherein the established acceleration time is specifically as follows: the accelerated corrosion time of the carbon steel is 0 to 960h, the accelerated corrosion time of the galvanized steel is 0 to 1500h, and the accelerated corrosion time of the aluminum alloy and the stainless steel is 0 to 3000h.
8. The test method according to claim 1, wherein the specified sampling period is specifically: sampling is carried out when carbon steel tests are carried out for 48h, 96h, 240h, 480h and 960h, sampling is carried out when galvanized steel tests are carried out for 96h, 240h, 480h, 960h, 1200h and 1500h, and sampling is carried out when aluminum alloy and stainless steel tests are carried out for 240h, 480h, 960h, 1440h, 1920h, 2400h and 2880 h.
9. Test method according to claim 1, characterized in that said parameters comprise: macroscopic appearance, weighing and thickness of the sample before the corrosion products are removed, electrochemical analysis of the corrosion products, macroscopic appearance, weight and thickness after the corrosion products are cleaned, on-resistance and conductivity of the assembled sample, and tensile strength and elongation after fracture of the tensile sample.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625921A (en) * | 2023-05-31 | 2023-08-22 | 国网智能电网研究院有限公司 | Method and device for evaluating corrosion degree of aluminum alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116625921A (en) * | 2023-05-31 | 2023-08-22 | 国网智能电网研究院有限公司 | Method and device for evaluating corrosion degree of aluminum alloy |
| CN116625921B (en) * | 2023-05-31 | 2024-03-26 | 国网智能电网研究院有限公司 | Method and device for evaluating corrosion degree of aluminum alloy |
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