CN112394026A - Rapid evaluation method for performance of weather-resistant steel rust layer for transmission tower in rural atmospheric environment - Google Patents
Rapid evaluation method for performance of weather-resistant steel rust layer for transmission tower in rural atmospheric environment Download PDFInfo
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- CN112394026A CN112394026A CN202011438191.1A CN202011438191A CN112394026A CN 112394026 A CN112394026 A CN 112394026A CN 202011438191 A CN202011438191 A CN 202011438191A CN 112394026 A CN112394026 A CN 112394026A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for quickly evaluating the performance of a weathering steel rust layer for a power transmission tower in a rural atmospheric environment, which belongs to the technical field of the performance evaluation of the weathering steel rust layer.
Description
Technical Field
The invention relates to the technical field of performance evaluation of a weathering steel rust layer, in particular to a rapid performance evaluation method of the weathering steel rust layer for a transmission tower in a rural atmospheric environment.
Background
The transmission tower is usually protected from corrosion by hot dip galvanizing, which requires special procedures of rust removal, acid cleaning and galvanizing, and has large investment and serious pollution in the process. Usually, the zinc liquid needs to be heated to about 450 ℃, harmful gas can be released, the health of people is harmed, and particularly, Cr in the galvanizing passivation solution6+Has great harm to human body and environment and is not favorable for environmental protection, Cr6+Pollution control is a worldwide problem and is also limited by environmental protection departments.
The weathering steel is atmospheric corrosion resistant steel, which is low alloy steel between common steel and stainless steel. By adding a small amount of alloy elements into the steel, a protective layer is formed on the surface of a metal matrix, and the development of corrosion to the depth of the material is slowed down, so that the corrosion resistance of the steel is improved. The prior acid washing, hot galvanizing and other processes can be avoided, some weathering steel can be directly exposed for use, and the longer the service time is, the more prominent the corrosion resistance is.
The transmission tower uses weathering steel, so that the traditional hot-dip galvanizing procedure can be eliminated, and the pollution to the atmosphere and the soil environment is reduced; the weathering steel transmission tower is free of hot galvanizing processing cost, can reduce later-stage anticorrosion maintenance cost, and is beneficial to reducing engineering cost.
In order to promote the rapid formation of a stable rust layer when the weathering steel bridge is exposed for use and prevent the problem of early rust liquid sagging, a surface stabilizing treatment technology is usually adopted at present, namely the surface of the weathering steel is treated before use to form a breathable and water-permeable film. The performance of the film is a decisive factor for the corrosion resistance of weathering steels.
At present, methods for detecting the weathering steel rust layer mainly comprise a visual inspection method, a tape adhesion test method, an ultrasonic test and the like. The methods measure the surface performance before service, cannot evaluate the performance of the rust layer in the long-term service process, and cannot aim at the characteristics of different atmospheric environments.
To evaluate the long-term service performance of the rust layer, an environment acceleration simulation test is required, no unified method is available at present, the most common method is to adopt a week immersion corrosion test in a TB/T2375 'periodic immersion corrosion test method of weathering steel for railways', and a test solution specified by the standard is NaHSO with the concentration of 0.01mol/L4The evaluation method was a weight loss method. Most of the existing papers and patents adopt periodic infiltration corrosion tests, adopt different test solutions aiming at different service environments, and then perform evaluation by methods such as a weight loss method, corrosion morphology, XRD corrosion products and the like. The disadvantages of this method are the long test period: according to TB/T2375, a periodic immersion test and a weight loss method are adopted, the test period can be about 50, 75 and 100 hours, the test material is a bare material which is not subjected to surface stabilization treatment, the 100-hour periodic immersion test reflects the generation speed of the rust layer on the surface of the weathering steel and cannot reflect the performance of the rust layer in the long-term service process, and the performance of the rust layer in the long-term service process needs a longer test.
Typical atmospheric environments are classified into rural atmospheric environments, coastal atmospheric environments, and industrial atmospheric environments. The patent provides a rapid test and evaluation method for evaluating the durability of a weather-resistant steel rust layer for a transmission tower in a rural atmospheric environment.
Disclosure of Invention
The invention aims to provide a method for quickly evaluating the performance of a weather-resistant steel rust layer for a power transmission iron tower in a rural atmospheric environment, so as to solve the technical problem.
In order to realize the purpose, the invention provides the following technical scheme: a method for evaluating the durability of a weathering steel rust layer for a transmission tower in a rural atmospheric environment comprises the following steps:
the method comprises the following steps: sampling a test sample: selecting three groups of weathering steel samples to be tested, wherein two groups of weathering steel samples are subjected to stabilization treatment;
step two: simulation of corrosion test: performing a water bath test on one group of stabilized weathering steel samples, wherein the simulated solution is deionized water, the pH value of the simulated solution is 7, the temperature is 50 ℃, and the water bath test time is 8 hours;
step three: recording test data: recording an adhesion test F2 after the weathering steel test sample is subjected to stabilizing treatment and simulated corrosion in a water bath, recording an adhesion test F1 of another group of weathering steel test samples which are subjected to stabilizing treatment and not subjected to simulated corrosion, and recording a calculation reference adhesion F0 of another group of weathering steel test samples which are not subjected to stabilizing treatment and simulated corrosion;
step five: and (3) corrosion resistance evaluation: evaluating the value K; wherein:
K＝F1/F0+F2/F1；
and comparing the K values of all the models, wherein the larger the K value is, the better the service performance is under the atmospheric environment of the country.
Preferably, in the third step, the adhesion force test mode is to use a weight with the diameter of phi 10mm, fix the bottom surface of the weight on the rust layer on the surface of the sample through adhesive, and apply force on the weight by using a tensile machine to pull the rust layer off from the sample to generate tensile force.
Preferably, in the fifth step, a qualified reference value K0 is drawn up according to the characteristics of the sample, and when the sample K is more than or equal to K0, the performance of the rust layer of the sample is excellent.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for quickly evaluating the performance of a weathering steel rust layer of a power transmission iron tower in a rural atmospheric environment, which is used for carrying out a corrosion simulation test according to the service characteristics of a simulated rural atmospheric corrosion environment. Because the rural atmospheric environment has a good service environment, a long-time weekly leaching test consumes a large amount of manpower and material resources, and a rapid evaluation method is urgently needed. The water bath equipment is adopted to replace the weekly leaching equipment, and compared with the weekly leaching equipment, the water bath equipment has lower price and more stable test; in view of the fact that the rust layer adhesion force is reduced under the conditions of humidity and strong sunshine, and then the rust layer falls off under the conditions of rain wash, the performance of the rust layer is judged by detecting the adhesion force change instead, and the test time can be effectively shortened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of the performance test evaluation of the weathering steel rust layer of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a method for evaluating the durability of a weathering steel rust layer for a transmission tower in a rural atmospheric environment comprises the following steps:
the method comprises the following steps: sampling a test sample: selecting three groups of weathering steel samples to be tested, wherein two groups of weathering steel samples are subjected to stabilization treatment;
step two: simulation of corrosion test: performing a water bath test on one group of stabilized weathering steel samples, wherein the simulated solution is deionized water, the pH value of the simulated solution is 7, the temperature is 50 ℃, and the water bath test time is 8 hours;
step three: recording test data: recording an adhesion test F2 after the weathering steel test sample is subjected to stabilizing treatment and simulated corrosion in a water bath, recording an adhesion test F1 of another group of weathering steel test samples which are subjected to stabilizing treatment and not subjected to simulated corrosion, and recording a calculation reference adhesion F0 of another group of weathering steel test samples which are not subjected to stabilizing treatment and simulated corrosion;
step five: and (3) corrosion resistance evaluation: evaluating the value K; wherein:
K＝F1/F0+F2/F1；
and comparing the K values of all the models, wherein the larger the K value is, the better the service performance is under the atmospheric environment of the country.
Furthermore, in the third step, the adhesion force test mode is to use a weight with the diameter of phi 10mm, fix the bottom surface of the weight on the rust layer on the surface of the sample through adhesive, and apply force on the weight by using a tensile machine to pull the rust layer off from the sample to generate tensile force.
Furthermore, in the fifth step, a qualified reference value K0 is drawn up according to the characteristics of the sample, and when the sample K is more than or equal to K0, the performance of the rust layer of the sample is excellent.
Example 1:
3 weathering steel samples (a sample is Q420NTH) with the same chemical composition and different stabilizing treatment processes are respectively an A sample, a B sample and a C sample, evaluation is carried out by the method, test data are recorded and recorded as shown in a table 1, wherein a naked sample is exposed to the sun for one month in an atmospheric environment, and the measured adhesive force F0 is 2 Mpa;
table 1: comparison table of test results of 3 different weathering steel samples with same chemical composition and different stabilizing treatment processes
By the method, the sample A and the sample B have good service performance in the rural atmospheric environment, and the sample C has poor performance.
And comparing the weightlessness test results of the 3 samples hung on the site for 1 year, wherein the results are consistent, so that the conclusion can be concluded that the evaluation method is consistent with the site sample hanging test result with the most accurate test result.
Example 2:
3 weathering steel samples (a sample is Q420NTH) with different chemical compositions in the same stabilizing treatment process are respectively an A sample, a B sample and a C sample, the evaluation is carried out by the method, test data are recorded and recorded as shown in a table 2, wherein a naked sample is exposed to the sun for one month in the atmospheric environment, and the measured adhesive force F0 is 2 Mpa;
table 2: test result comparison table for 3 different weathering steel samples with same stabilizing treatment process and different chemical compositions
By this method, sample a is superior to test C over sample B;
and comparing the weightlessness test results of the 3 samples hung on the site for 1 year, wherein the results are consistent, so that the conclusion can be concluded that the evaluation method is consistent with the site sample hanging test result with the most accurate test result.
Example 3:
weathering steel test samples (a sample is Q420NTH) of 3 different manufacturers in the same stabilizing treatment process are respectively an A test sample, a B test sample and a C test sample, evaluation is carried out by the patent method, test data are recorded and shown in a table 3, and F0 adopts the average value of the three manufacturers;
table 3: test result comparison table for 3 different weathering steel samples of different manufacturers and with same stabilizing treatment process
By the method, the sample C of the sample A has better performance, and the sample B has poorer performance;
and comparing the weightlessness test results of the 3 samples hung on the site for 1 year, wherein the results are consistent, so that the conclusion can be concluded that the evaluation method provided by the invention is consistent with the most accurate on-site sample hanging test method.
Example 4:
a qualified reference value K0 is planned by the evaluation method according to the characteristics of the test sample and the corrosion test result of the field sample hanging for 1 year in advance, when the test sample is tested, F1, F2 and K value are measured and calculated according to the experimental mode and the evaluation method, and when the test sample K is more than or equal to K0, the test sample shows that the test sample has excellent performance.
In conclusion of the three embodiments, the test results show that the evaluation method provided by the invention has the same result as the traditional evaluation method, and can effectively evaluate the durability of the weathering steel in the rural atmospheric environment.
In the description of the invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "two ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the invention is understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for evaluating the durability of a weathering steel rust layer for a transmission tower in a rural atmospheric environment is characterized by comprising the following steps:
the method comprises the following steps: sampling a test sample: selecting three groups of weathering steel samples to be tested, wherein two groups of weathering steel samples are subjected to stabilization treatment;
step two: simulation of corrosion test: performing a water bath test on one group of stabilized weathering steel samples, wherein the simulated solution is deionized water, the pH value of the simulated solution is 7, the temperature is 50 ℃, and the water bath test time is 8 hours;
step three: recording test data: recording an adhesion test F2 after the weathering steel test sample is subjected to stabilizing treatment and simulated corrosion in a water bath, recording an adhesion test F1 of another group of weathering steel test samples which are subjected to stabilizing treatment and not subjected to simulated corrosion, and recording a calculation reference adhesion F0 of another group of weathering steel test samples which are not subjected to stabilizing treatment and simulated corrosion;
step five: and (3) corrosion resistance evaluation: evaluating the value K; wherein:
K＝F1/F0+F2/F1；
and comparing the K values of all the models, wherein the larger the K value is, the better the service performance is under the atmospheric environment of the country.
2. The method for evaluating the durability of the weathering steel rust layer of the transmission tower in the rural atmospheric environment according to claim 1, wherein the method comprises the following steps: in the third step, the adhesion force test mode is that a weight with the diameter of phi 10mm is used, the bottom surface of the weight is fixed on the rust layer on the surface of the sample through adhesive, and a tensile machine is used for applying force to the weight to pull the rust layer from the sample to generate tensile force.
3. The method for evaluating the durability of the weathering steel rust layer of the transmission tower in the rural atmospheric environment according to claim 1, wherein the method comprises the following steps: and step five, drawing up a qualified reference value K0 according to the characteristics of the sample, and when the sample K is more than or equal to K0, indicating that the performance of the rust layer of the sample is excellent.
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Cited By (3)
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| CN113640216A (en) * | 2021-09-14 | 2021-11-12 | 鞍钢股份有限公司 | Device and method for evaluating adhesive force of rust layer of rusted steel sample |
| CN113834770A (en) * | 2021-09-23 | 2021-12-24 | 中铁十一局集团第一工程有限公司 | Test device and test method for stabilization of rust layer of weather-resistant steel |
| CN114199784A (en) * | 2021-11-17 | 2022-03-18 | 南京钢铁股份有限公司 | Method for measuring stabilization time of weathering steel rust layer and storage medium |
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