CN115575272A - Aluminum alloy conductor material corrosion characteristic identification and service performance test and evaluation method - Google Patents
Aluminum alloy conductor material corrosion characteristic identification and service performance test and evaluation method Download PDFInfo
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Abstract
The invention provides an aluminum alloy conductor material corrosion characteristic identification and service performance test, which comprises the following steps: selecting the type of an aluminum conductor material corrosion test sample; pretreating an aluminum conductor corrosion sample; and (5) testing corrosion characteristic parameters. The evaluation method comprises the following steps: making a proper sampling period; derusting the corroded aluminum sample; and (3) carrying out corrosion feature identification on the pattern: the method comprises the following steps of conducting resistance testing, conductivity testing, surface morphology testing and electrochemical testing. The method is used for researching the corrosion behavior and the service performance change rule of the aluminum conductor material in the typical atmospheric environment, extracting the corrosion characteristics of the aluminum conductor material, and realizing qualitative and quantitative judgment on the corrosion of the aluminum conductor material and parts; the change rule of the service key performance of the aluminum alloy conductor material along with the corrosion process is mastered, and the service level of the aluminum alloy conductor component is accurately evaluated.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy corrosion research, and particularly relates to a method for identifying corrosion characteristics and testing and evaluating service performance of an aluminum alloy conductor material.
Background
The aluminum and aluminum alloy have the advantages of light weight, high specific strength, good electrical and thermal conductivity, easy processing and the like, are widely applied to conductor components of a power grid, are mainly applied to power transmission and transformation equipment such as circuit breakers, reactors, isolation switches, power hardware fittings, overhead conductors, tubular buses, GIS and the like, and the annual consumption of aluminum in a power grid system can reach more than 200 ten thousand tons. The conductor component is a key component for directly bearing power transmission, and the service performance of the conductor component plays a vital role in stable and reliable operation of power transmission and transformation equipment and even the whole power grid.
Most aluminum and aluminum alloy conductors are generally used in a bare state because they have good atmospheric corrosion resistance due to the formation of a dense oxide film on the surface, and thus atmospheric corrosion of the aluminum alloy conductor material is often neglected. However, the aluminum oxide film is easily dissolved under chloride ions and acidic conditions, thereby causing rapid corrosion of aluminum. Under coastal environment and industrial pollution environment, the corrosion phenomenon of the aluminum alloy is more obvious. The distribution span of the power engineering is large, the region is wide, the aluminum alloy conductor part exposed in the severe atmosphere environment has high occupation ratio, the aluminum alloy conductor part is corroded by the atmosphere environment for a long time, and the concealment of the corrosion part and the accumulation of the corrosion degree cause damage failure to bring great potential safety hazards to equipment. For example, the contact resistance of components such as aluminum alloy contacts and splicing fittings is increased due to corrosion, and then corrosion failure is caused to cause faults such as strand breakage of aluminum strands and abnormal temperature rise of wire clamp joints, so that the service life is far shorter than the designed service life.
At present, the research on atmospheric corrosion of aluminum alloy mostly focuses on 2-series, 7-series and other high-strength aluminum alloys, and the aluminum alloys are generally used as structural members and applied to the fields of aerospace, transportation and the like due to the high strength of the aluminum alloys; the research on corrosion of the metal materials of the power grid is mostly concentrated on carbon steel, galvanized steel, copper and other materials, so that the research on corrosion rules and behaviors of the aluminum conductor materials for the power grid in a typical atmospheric environment is less. As a key current-carrying component in an electric power system, aluminum materials need to have excellent electric conduction characteristics, good mechanical properties and good corrosion resistance. Because the corrosion data volume of the current aluminum conductor material is small, the corrosion development characteristic of the aluminum conductor material under the typical atmospheric environment cannot be mastered; the aluminum alloy conductor material has uncertain service key properties such as conductivity and mechanical properties along with the change rule of the corrosion process, and has the problems that targeted corrosion measure selection, operation maintenance strategy making and the like cannot be carried out according to the change of the service properties.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for identifying the corrosion characteristics of an aluminum alloy conductor material and testing and evaluating the service performance of the aluminum alloy conductor material, which can be used for researching the corrosion behavior and the service performance change rule of the aluminum conductor material in a typical atmospheric environment, extracting the corrosion characteristics of the aluminum alloy conductor material and qualitatively and quantitatively judging the corrosion of the aluminum alloy conductor material and parts; the change rule of the service key performance of the aluminum alloy conductor material along with the corrosion process is mastered, and the service level of the aluminum alloy conductor component is accurately evaluated.
In order to achieve the technical purpose, the invention is realized by the following technical scheme:
a method for identifying corrosion characteristics and testing and evaluating service performance of an aluminum alloy conductor material comprises the following steps:
(1) And (4) selecting a sample for the corrosion test of the aluminum conductor material. Including type selection of brand and sample type.
The corrosion sample component with proper grade and shape is selected, which is the premise of accurately pre-judging the corrosion state and development rule of the aluminum alloy conductor. Through a corrosion characteristic identification test, the corrosion characteristic parameters of the aluminum alloy conductor material in a typical atmospheric corrosion environment can be quickly obtained, and basic data are provided for the pre-judgment of the service performance degradation and the corrosion life of equipment parts.
The selection of the aluminum alloy grade used in the corrosion test is based on the common aluminum and aluminum alloy grade of the power grid, and the target is clear and strong in pertinence. Among them, 1-series pure aluminum is widely used as a guide member because of its good conductivity, 6-series aluminum alloy is often used in an occasion where both mechanical properties and conductivity are required, and other electrical aluminum alloy conductors such as high-strength heat-resistant aluminum alloy and aluminum magnesium alloy are constantly developed and applied. Therefore, in the present invention, 1-series, 5-series, and 6-series aluminum alloys, specifically 1050, 5a01, and 6063, respectively, were selected for the corrosion test.
The aluminum alloy conductor samples are flat plate samples, tensile samples and lead wire compression joint samples. The size of a flat plate sample is about 50mm multiplied by (5 to 6) mm, and the flat plate sample can be used for revealing the corrosion behavior of aluminum and aluminum alloy materials; tensile test specimens were tested according to GB/T228.1-2010 metallic Material tensile test part 1: the room temperature test method can be used for researching the degradation rule of the mechanical property of the aluminum alloy along with corrosion defects and corrosion processes. Aluminum and aluminum alloy are structural members such as overhead line aluminum stranded wires, wiring boards, strain clamps and the like in a large amount in the power industry, so that the wiring boards and the lead crimping samples are directly used to participate in indoor corrosion tests, and the change trend of service performances such as conductivity, mechanical property and the like of the aluminum alloy conductor member along with the development of corrosion can be mastered.
(2) And (4) pretreating an aluminum conductor corrosion sample.
Before the corrosion characteristic parameter test is carried out, the surface and deformation or stress state of the aluminum conductor sample are pretreated.
The surface pretreatment process of the flat plate sample of the aluminum conductor material and the structural part needs to comprise the following steps: (1) labeling; (2) cleaning: scrubbing the surface of the sample with absolute ethyl alcohol twice to remove oil stains, cleaning with deionized water, drying with cold air, and placing in a dryer for 24 hours; (3) weighing: measuring the original weight of the flat plate sample: weighing the mass by adopting a balance with the precision of 0.1 mg; (4) and (3) drying: the sample is placed in a drier for more than 24 hours before the corrosion characteristic parameter test.
In order to realize accurate simulation of the corrosion state of the aluminum alloy conductor part, deformation or moment is applied to the structural part for the acceleration test. The aluminum alloy wiring board is formed by mutually staggering and overlapping two same aluminum alloy plates, fastening the aluminum alloy plates through bolts, and applying a moment of 45N 8729m-50N 8729m to simulate the actual stress state of the aluminum wiring board.
(3) And (5) testing corrosion characteristic parameters.
The method for testing the corrosion characteristic parameters of the aluminum alloy conductor material adopts a cycle soaking and alternating damp-heat cycle program. Alternate circulation is carried out every 10-12h by adopting a mode of 'weekly soaking-alternating damp and hot'. Wherein the weekly soaking is according to "soak →And (3) circulating the steps of humidity → drying, wherein the temperature of the soaking solution is 65-75 ℃, the soaking time is 7-10min, the drying condition temperature is 25-70 ℃, and the drying time is 50-53min. Using a composition of a soaking solution of specified ingredients to represent several typical atmospheric corrosion environments, using distilled water as the soaking solution for simulating rural atmospheric corrosion environments, 3.5% of NaCl +0.05% of Na 2 SO 4 The soaking solution is used for simulating the marine atmospheric environment; 0.1% of NaCl +0.2% of NaHSO 3 The soaking solution is used for simulating urban atmospheric environment; 0.1% of NaCl +1% of high content of bisulfite ions 3 The soaking solution is used for simulating an industrial atmospheric environment. The temperature of the corrosive solution is based on the annual average temperature and the operation temperature rise in a typical atmospheric environment, and due to the Joule heat effect of aluminum conductor materials in a power grid system and a calculation method of the current-carrying capacity of the aluminum conductor materials, the temperature rise usually does not exceed 70 ℃, and the selection of the soaking temperature can comprehensively simulate the operation heating state of a lead. The drying temperature is comprehensively considered by combining the annual average temperature and the actual operating temperature of the component. The soaking time and the drying time are determined by the ratio of the average action time of fog and open years in a typical atmospheric environment spectrum to the total time. The components and the concentration of the accelerated corrosion solution are based on the components and the concentration of a corrosion medium in atmospheric environment data. The alternating damp heat is circulated according to the program of 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'. By adopting the weekly immersion and alternating damp-heat circulation mode, the alternating phenomenon of day and night behavior modes of the actual operating environment can be simulated, and the influence of the difference of the discharge amount of pollutants between the day and the night is fully considered. And the alternating damp-heat program selects the temperature and humidity circulation of high temperature and high humidity, high temperature and low humidity and low temperature and high humidity, so that the maintenance of a liquid film on the surface of the corrosion sample can be ensured, and the corrosion acceleration effect is enhanced. The reasonable formulation of the accelerated corrosion test parameters in the laboratory can ensure that the components in the accelerated corrosion test are close to the actual service environment, and the corrosion damage mode which is the same as the actual atmospheric environment is adopted.
(4) Test sampling and performance evaluation.
Because aluminum and aluminum alloy have better corrosion resistance, pitting development is usually shown in the initial stage of corrosion, and the process is slow. The test period of the aluminum alloy corrosion characteristic parameters is set to be 0-3000 h, and the pitting initiation and development rule of the aluminum alloy conductor material can be seen by setting the corrosion time.
And (4) making a proper sampling period according to the corrosion development process of the aluminum alloy conductor material. Sampling is carried out when the aluminum alloy is subjected to corrosion tests for 240h, 480h, 960h, 1440h, 1920h, 2400h and 2880 h. In the initial stage of corrosion, the sampling time is multiplied, and the sampling time intervals in the later stage are the same. The reasonable formulation of sampling period can optimize the sample quantity of putting in the experiment, reduces the unnecessary test volume, also can catch the typical moment that aluminum alloy conductor corrodes the characteristic parameter and change smoothly.
At each sampling time, the corrosion sample was removed from the test apparatus and the sample was cleaned as thoroughly as possible to avoid continued corrosion of the sample. And evaluating the corrosion parameters and the performance of the taken sample. Before the corrosion products are removed, the flat plate sample and equipment components need to be analyzed for macroscopic appearance, weight change, thickness, corrosion products and electrochemical analysis, and the equipment components such as an aluminum wiring board are used for measuring performance parameters such as on resistance, conductivity and the like. The corrosion products were cleaned according to the standard and the corroded aluminum coupon was placed in 50 mL H at 80 deg.C 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 analyzing parameters such as macroscopic appearance, weight, thickness and the like of the sample after the corrosion products are removed. The tensile sample is used for detecting tensile strength and elongation after fracture. By detecting the parameters before rust removal, the development law of the corrosion parameters before rust removal can be obtained and compared with the law of the corrosion parameters after rust removal. 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.
The method for identifying the main corrosion characteristics of the aluminum alloy comprises the following steps:
(1) On-resistance testing
The on-resistance of the wiring board is tested by adopting a German and American Cui MI3252 (100A) type portable low-resistance ohmmeter, and the measuring range of the instrument is as follows: 100n omega-20 omega, the test current is 100mA-100A, and the resistance of the measurement lead is eliminated by using a four-wire Kelvin measurement method.
(2) Conductivity test
The conductivity of the wiring board is measured by a SIGMASCOPE SMP10 handheld conductivity tester, before measurement, a sample and equipment are placed in the same indoor environment, a temperature sensor built in ES40 of a measuring probe is used for measuring the temperature, and a corresponding result is input into the tester to finish automatic temperature compensation.
(3) Surface topography
And measuring the samples with different corrosion times by using a Brookfield optical profiler to obtain the surface micro-morphology of the samples.
(4) Electrochemical testing
A standard three-electrode system is adopted in an electrochemical experiment, wherein a graphite electrode is selected as an auxiliary electrode, and a Saturated Calomel Electrode (SCE) and a working electrode are selected as a reference electrode. Electrochemical tests were performed using a Princeton PAR2273 electrochemical workstation.
The order and contents of the state evaluation of the corrosion sample are shown in table 1. The corrosion state evaluation content and sequence of the aluminum alloy conductor material are determined, and the aluminum alloy corrosion characteristic parameter detection and evaluation process is specified. The evaluation of the performance of the flat plate sample can reflect the corrosion behavior of the aluminum alloy material; the performance evaluation of the wiring board, the tensile sample and the long lead reflects the development change rule of the service performance of the aluminum alloy conductor material along with the corrosion process. In addition, the weight of the flat plate and the wiring board sample and the change of the corrosion pit depth are detected simultaneously, and the correlation of the corrosion rule of the equipment part and the material can be established. In consideration of the actual working state of the on-site power transmission and transformation equipment component running with rust, the evaluation method provided by the invention focuses on the performance change of the sample before the corrosion product is removed, and weakens the performance detection of the sample after rust removal, so that on one hand, the accurate simulation of the on-site power transmission and transformation equipment component can be realized, and on the other hand, the complicated rust removal process is reduced.
A test and evaluation method for corrosion characteristics and corrosion development of an aluminum alloy conductor material is disclosed, wherein corrosion weight loss of an aluminum alloy in the initial corrosion stage is found to be smaller by simulating the corrosion development of the aluminum alloy conductor material and a member, and the development rule of the corrosion weight loss of an aluminum alloy wiring board is basically the same as that of a flat plate sample. The pitting depth of the aluminum alloy conductor material and the member is gradually increased, and the on-resistance of the aluminum wiring board also shows a gradually increasing trend along with the prolonging of the corrosion time. Therefore, the corrosion development process of the aluminum alloy can be accurately represented by using the pitting depth as a corrosion characteristic parameter and using the on-resistance as the service performance of the aluminum alloy conductor member, and a certain correlation exists between the pitting depth and the service performance of the aluminum alloy.
Wherein the correlation relation between the corrosion weightlessness of the aluminum alloy wiring board and the flat plate sample is as follows: m =47.004m +0.0308, R2=0.9703 [1 ]](ii) a Formula [1 ]]Wherein M is corrosion weight loss of the wiring board, M is corrosion weight loss of the flat plate sample, and the unit is mg/cm 2 。
The correlation relation between the on-resistance of the aluminum alloy wiring board and the depth of the pitting pits is as follows: r =0.1175d +0.4923, R 2 =0.8776 [2](ii) a Formula [2 ]]Where R is the on-resistance of the wiring board in units of μ Ω, and d is the etch pit depth in units of μm.
TABLE 1 evaluation sequence and content of corrosion state of aluminum alloy conductor material
The invention has the following beneficial effects:
(1) According to the method for identifying the corrosion characteristics of the aluminum alloy conductor material and testing and evaluating the service performance, the 'soaking-wetting-drying' state circulation is realized through a 'circumferential soaking-alternating damp-heat' mode, four typical atmospheric environments of village, city, industry and ocean in a real state are simulated by controlling the humidity, the temperature, the corresponding duration and the pollutant types and concentrations, the dry-wet circulation process of the surface of the aluminum alloy conductor material in the actual service environment is well reproduced, and the corrosion state simulation of common aluminum alloy conductor materials and components in the typical atmospheric environment can be realized;
(2) According to the method for testing and evaluating the corrosion characteristics and service performance of the aluminum alloy conductor material, provided by the invention, the corrosion characteristics of the aluminum alloy conductor material are screened, the corrosion data of the aluminum alloy material and the component of the power transmission and transformation equipment are supplemented, the method can be used for researching the corrosion behavior and law of the aluminum conductor material in the typical atmospheric environment, and the qualitative and quantitative judgment of the corrosion of the aluminum alloy conductor material and the component is realized;
(3) The invention provides a method for testing and evaluating corrosion characteristics and service performance of an aluminum alloy conductor material, which reveals the change rule of service key performance of the aluminum alloy conductor material along with the corrosion process, and realizes service evaluation of an aluminum alloy conductor part;
(4) According to the method for testing and evaluating the corrosion characteristics and service performance of the aluminum alloy conductor material, the relevance between the material corrosion and the aluminum alloy conductor part is established, and the accuracy of judging the corrosion rule of the equipment member according to laboratory corrosion data is improved.
(5) According to the method for testing and evaluating the corrosion characteristics and the service performance of the aluminum alloy conductor material, the basic data can be used for researching the relationship between the service performance and the corrosion defects of the aluminum alloy conductor member, and a criterion is provided for the corrosion failure of the aluminum alloy member.
(6) The test and evaluation method for the corrosion characteristics and corrosion development of the aluminum alloy conductor material realizes effective evaluation on the corrosion performance of the equipment material, and provides an environmental corrosion characteristic data basis for the grade selection, the corrosion maintenance mode and the period of the aluminum alloy conductor material serving as power transmission and transformation equipment.
Description of the drawings:
FIG. 1 is a schematic view of an aluminum alloy conductor tensile specimen;
FIG. 2 is a schematic view of a sample of an aluminum alloy wiring board;
FIG. 3 is a wire crimp sample;
FIG. 4 shows the change rule of corrosion weight loss of the aluminum alloy wiring board and the flat plate sample;
FIG. 5 shows the change of the on-resistance of the aluminum alloy wiring board and the change of the pit depth.
The specific implementation mode is as follows:
the present invention is further illustrated by the following examples.
A test and evaluation method for corrosion characteristics and corrosion development of an aluminum alloy conductor material selects 1050 aluminum alloy flat plate samples and wiring boards as test objects. The plate sample size is about 50 mm. Times.50 mm. Times.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. The patch panels need to be removed and weighed individually. It is necessary to test the on-resistance of the wiring board before the test.
The composition of the weekly leaching solution is 3.5% NaCl +0.05% by weight Na 2 SO 4 So as to simulate the corrosion environment of the ocean atmosphere. 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 hours, and circulating once every 1 hour according to the sequence of soaking for 10min to drying for 50 min. In the afternoon, 6: 00-next day 8:00, adopting a high-low humidity circulation mode, and setting programs of '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 out for corrosion product and micro-topography analysis. 2 samples the corrosion products were cleaned according to the standard, and the corroded aluminum samples were placed in 50 mL of H at 80 deg.C 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 with clear water, wiping with alcohol, drying, and weighing (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. Taking out 1 wiring board per cycle to observe corrosion position, taking picture, cleaning and weighing, calculating average corrosion rate, surface appearance observation and pitting dataAnd (6) measuring.
According to the correlation relation between the corrosion weight loss of the aluminum alloy wiring board and the flat plate sample, the method comprises the following steps: m =47.004m +0.0308, R 2 =0.9703 [1](ii) a Formula [1 ]]M is corrosion weight loss of the wiring board, M is corrosion weight loss of the flat plate sample, and the unit is mg/cm 2 . Wherein the corrosion weight loss of the 960h plate pattern is 0.4mg/cm 2 And the calculated corrosion weight loss of the wiring board is 2.5032mg/cm 2 Actual corrosion weight loss of the wiring board was 2.5mg/cm 2 。
The correlation relation between the on-resistance increase value of the aluminum alloy wiring board and the pit depth is as follows: r =0.1175d +0.4923, R 2 =0.8776 [2](ii) a Formula [2 ]]Where R is the on-resistance of the wiring board in units of μ Ω, and d is the etch pit depth in units of μm. Wherein the 960h corrosion pit depth is 36 μm, the calculated on-resistance increase value of the wiring board is 4.7223 μ Ω, and the actual on-resistance increase value of the wiring board is 5.316 μ Ω.
The corrosion development of the aluminum alloy material and the wiring board is simulated. The corrosion surface of the aluminum alloy and the component is microscopically detected by a profilometer, and the pitting corrosion is found to be a main characteristic of the corrosion development of the aluminum alloy and the component, so that the surface roughness is increased. Pitting gradually progresses with the progress of corrosion, and the diameter of the pitting pit, the depth of the pitting pit, and the like are increasing. The on-resistance of the aluminum wiring board also shows a tendency to increase gradually as the etching time is prolonged. Therefore, the depth of the pitting corrosion pit is used as a corrosion characteristic parameter, the corrosion development process of the aluminum alloy can be accurately represented, and certain correlation exists between the pitting corrosion and the service performance of the aluminum alloy.
Claims (10)
1. A method for identifying corrosion characteristics and testing service performance of an aluminum alloy conductor material is characterized by comprising the following steps:
(1) Selecting the type of an aluminum conductor material corrosion test sample;
(2) Pretreating an aluminum conductor corrosion sample;
(3) And (5) testing corrosion characteristic parameters.
2. The method for identifying corrosion characteristics and testing service performance of an aluminum alloy conductor material as claimed in claim 1, wherein the type of the aluminum conductor is 1-series, 5-series or 6-series aluminum alloy.
3. The method for identifying the corrosion characteristics and testing the service performance of the aluminum alloy conductor material according to claim 1, wherein the aluminum alloy conductor sample is in the form of a flat plate sample, a tensile sample or a wire crimping sample.
4. The method for identifying the corrosion characteristics and testing the service performance of the aluminum alloy conductor material according to claim 1, wherein an aluminum conductor corrosion sample is pretreated into a surface and a deformation or stress state.
5. The method for identifying the corrosion characteristics and testing the service performance of the aluminum alloy conductor material as claimed in claim 1, wherein the pretreatment of the stress state is to apply deformation or moment to the structural member.
6. The method for identifying the corrosion characteristics and testing the service performance of the aluminum alloy conductor material according to claim 5, wherein when the structural component is an aluminum alloy wiring board, two identical aluminum alloy plates are mutually overlapped and fastened through bolts, and a torque of 45N 8729m-50N 8729m is applied.
7. The method for identifying the corrosion characteristics and testing the service performance of the aluminum alloy conductor material as claimed in claim 1, wherein the corrosion characteristic parameters are as follows: adopting a periodic infiltration and alternating damp-heat cycle program; alternate circulation is carried out every 10 to 12 hours by adopting a mode of 'week immersion-alternating damp and hot';
wherein the peripheral soaking is circulated according to the sequence of soaking → wetting → drying, the temperature of the soaking solution is 65-75 ℃, the soaking time is 7-10min, the drying condition temperature is 25-70 ℃, and the drying time is 50-53min;
the alternating damp heat is circulated according to the program of 'temperature 25 ℃, humidity 97%,30min → temperature 60 ℃, humidity 50%,30 min'.
8. The method for identifying corrosion characteristics and testing service performance of an aluminum alloy conductor material as claimed in claim 7, wherein the soaking solution is: simulation of rural atmospheric corrosion environment using distilled water as soaking solution, 3.5% of NaCl +0.05% of Na 2 SO 4 The soaking solution is used for simulating the marine atmospheric environment; 0.1% of NaCl Biddish 0.2% 3 The soaking solution is used for simulating urban atmospheric environment; 0.1% of NaCl +1% of high content of bisulfite ions 3 The soaking solution is used for simulating industrial atmospheric environment.
9. The method for identifying the corrosion characteristics and evaluating the service performance test of the aluminum alloy conductor material as set forth in any one of claims 1 to 8 comprises the following steps:
(1) Making a proper sampling period: sampling when the corrosion of the aluminum alloy is tested for 240h, 480h, 960h, 1440h, 1920h, 2400h and 2880 h;
(2) The corroded aluminum sample is placed in 50 mL of H at 80 DEG C 3 PO 4 +20g CrO 3 +1 L H 2 In the rust removing liquid O for 5-10min;
(3) And (3) carrying out corrosion feature identification on the pattern: the method comprises the following steps of conducting resistance testing, conductivity testing, surface topography testing and electrochemical testing.
10. The evaluation method according to claim 9, wherein the correlation between the corrosion weight loss of the aluminum alloy wiring board and the flat plate specimen is: m =47.004m +0.0308, R 2 =0.9703; wherein M is corrosion weight loss of the wiring board, M is corrosion weight loss of the flat plate sample, and the unit is mg/cm 2 ；
The correlation relation between the increase value of the on-resistance of the aluminum alloy wiring board and the depth of the pitting pits is as follows: r =0.1175d +0.4923, R 2 =0.8776; wherein R is the on-resistance of the wiring board in μ Ω, and d is the depth of the etch pit in μm.
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| 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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