CN112085320A - Method for graded evaluation of corrosion resistance of grounding material - Google Patents
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Abstract
The invention belongs to the technical field of electric power engineering material experiments, and relates to a method for graded evaluation of corrosion resistance of a grounding material, which comprises the following steps: s1, constructing a corrosion resistance grading evaluation table: selecting a sample made of a certain material as a comparison sample, selecting typical grounding materials of stainless steel, copper and carbon steel in the market as grading reference samples, and determining the numerical range of the relative corrosion rate alpha of 100, 80, 60, 40 and 20 grades according to the grading reference basis of 100, 80, 60 and 60 grades of stainless steel; s2, measuring the relative corrosion rate alpha of the target sample; s3, scoring the target sample: and searching corresponding scores in the corrosion resistance grading evaluation table according to the relative corrosion rate alpha of the target sample, and recording the scores as the score value of the target sample. The invention makes up that the current regulations do not have a unified evaluation method for the corrosion resistance of the grounding material, and can carry out grading evaluation work on the corrosion resistance of various grounding materials, thereby providing guidance for the selection and the use of the grounding materials.
Description
Technical Field
The invention belongs to the field of grounding materials in electric power engineering, and relates to a method for grading evaluation of corrosion resistance of a grounding material.
Background
The requirements on the stability and the economy of the power grid are increasing day by day, and new requirements on grounding materials are also provided. Besides traditional carbon steel and galvanized steel, a plurality of novel grounding materials emerge from the market, and although the grounding materials have advantages, functional short plates also exist.
In addition, the Chinese patent publication No. CN203535973U, namely, "non-metal composite carbon fiber copper-plated grounding material", the Chinese patent publication No. CN101976768A, namely, "a corrosion-resistant aluminum alloy grounding material preparation method", the Chinese patent publication No. CN103872469A, namely, "a novel non-metal corrosion-resistant grounding material", the Chinese patent publication No. CN203521648U, namely "low skin effect graphite composite grounding material", and the like also disclose methods for preparing parts of novel grounding materials.
However, there is no clear evaluation index for the corrosion resistance of many grounding materials, and there is no relevant standard to be based on, and there is a certain blindness and controversy for the use. It is necessary to provide a corrosion resistance evaluation method for the grounding material, so that experimental research is carried out on each evaluation index, guidance is provided for selection and use of the grounding material, and actual construction of the grounding system engineering of the transformer substation is enabled to have higher operability and normalization.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art and provides a method for grading evaluation of corrosion resistance of a grounding material; the invention makes up the defect that the current regulation has no unified evaluation method for the corrosion resistance of the grounding material, and can carry out grading evaluation work on the corrosion resistance of the grounding materials such as hot-dip galvanized steel, pure copper, copper-coated steel, zinc-coated steel, stainless steel-coated steel, conductive anticorrosive coating steel and the like, thereby providing guidance for the selection and the use of the grounding material.
The technical problem of the invention is mainly solved by the following technical scheme:
a method for graded evaluation of corrosion resistance of a grounding material comprises the following steps:
s1, constructing a corrosion resistance grading evaluation table: selecting a sample made of a certain material as a comparison sample, selecting typical grounding materials on the market, namely stainless steel, copper and carbon steel, as scoring reference samples, placing a large number of the scoring reference samples and the comparison sample in a corrosion box to enter a soil accelerated corrosion comparison experiment, carrying out experiment statistics on the relative corrosion rate alpha of each scoring reference sample, determining the numerical range of the relative corrosion rate alpha of 100 minutes, 80 minutes and 60 minutes according to the scoring reference basis of 100 minutes, 80 minutes and 60 minutes of stainless steel and the relative corrosion rate alpha of each scoring reference sample counted by the experiment, wherein the numerical range of the relative corrosion rate alpha of each adjacent grade differs by one order of magnitude, and determining the numerical range of the relative corrosion rate alpha of 40 minutes and 20 minutes by analogy according to the numerical range;
s2, measuring the relative corrosion rate alpha of the target sample: weighing and recording a target sample with a smooth surface and a comparison sample, placing the target sample and the comparison sample in a corrosion box in parallel, performing a soil accelerated corrosion comparison experiment, and measuring the relative corrosion rate alpha of the target sample after corrosion;
s3, scoring the target sample: and searching corresponding scores in the corrosion resistance grading evaluation table according to the relative corrosion rate alpha of the target sample, and recording the scores as the score value of the target sample.
More specifically, the relative corrosion rate α was tested using a Q235 carbon steel coupon as a control coupon.
More specifically, the evaluation table for the corrosion resistance rating is as follows:
more particularly, valuable grounding materials include hot-dip galvanized steel, pure copper, copper-clad steel, zinc-clad steel, stainless steel-clad steel, conductive corrosion-resistant coated steel.
More particularly, the soil accelerated corrosion comparative experiment: weighing and recording a target sample with a smooth surface and a Q235 carbon steel comparison sample, then parallelly placing the sample and the comparison sample in a corrosion box, controlling the soil thickness in each direction to be more than 50mm, controlling the temperature and the humidity of experimental soil to be 45 ℃ and 25%, standing for more than 15 days, taking out the sample, removing a surface corrosion product, weighing and recording.
More specifically, the relative corrosion rate calculation method: subtracting the weight of the soil after the accelerated corrosion comparison experiment from the initial weight of the target sample and the Q235 carbon steel comparison sample to obtain the weight loss W of the target sample and the weight loss W of the Q235 carbon steel comparison sample0Calculating the exposure area S of the target sample and the exposure area S of the comparative sample of Q235 carbon steel according to the sample size0The relative corrosion rate α of the target specimen was calculated as follows:
the invention has the following advantages: according to the corrosion resistance experiment result of a typical grounding material in the market, the corrosion resistance of stainless steel is the best, copper is the worst, carbon steel is the worst, the carbon steel is divided into 60 parts, the copper is divided into 80 parts, and the stainless steel is divided into 100 parts, so that the grading evaluation table of the corrosion resistance is constructed to ensure the grading differentiation. The method makes up the defect that the current regulation has no unified evaluation method for the corrosion resistance of the grounding material, and can carry out grading evaluation work on the corrosion resistance of the grounding materials such as hot-dip galvanized steel, pure copper, copper-coated steel, zinc-coated steel, stainless steel-coated steel, conductive anticorrosive coating steel and the like, thereby providing guidance for selection and use of the grounding material.
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FIG. 1 is a schematic diagram of a soil accelerated corrosion comparative experiment.
FIG. 2 is a flow chart of the present invention.
In the figure: 1-experimental soil, 2-test sample.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Referring to fig. 1 and 2, a method for graded evaluation of corrosion resistance of a grounding material comprises the following steps:
s1, constructing a corrosion resistance grading evaluation table: selecting a Q235 carbon steel sample as a comparison sample, selecting typical grounding materials in the market, namely stainless steel, copper and carbon steel as grading reference samples, placing a large number of the grading reference samples and the comparison samples in a corrosion box for a soil accelerated corrosion comparison experiment, weighing and recording the grading reference samples with smooth surfaces and the Q235 carbon steel comparison samples, placing the grading reference samples and the Q235 carbon steel comparison samples in the corrosion box in parallel, controlling the thickness of soil in each direction to be more than 50mm, controlling the temperature and the humidity of the experimental soil 1 to be 45 ℃ and 25%, standing for more than 15 days, taking out a sample 2, removing a surface corrosion product, weighing and recording.
The relative corrosion rate calculation method comprises the following steps: subtracting the initial weight of the grading reference sample and the Q235 carbon steel comparison sample from the weight of the soil after the accelerated corrosion comparison experiment to obtain the weightlessness W of the grading reference sample and the weightlessness W of the Q235 carbon steel comparison sample0Calculating the exposure area S of the target sample and the exposure area S of the comparative sample of Q235 carbon steel according to the sample size0The phase of the target sample was calculated as followsFor the corrosion rate α:
carrying out experimental statistics on the relative corrosion rate alpha of each grade reference sample, determining the numerical range of the relative corrosion rate alpha of each grade 100, 80 and 60 according to the relative corrosion rate alpha of each grade reference sample counted by the experiment on the basis of the grade reference basis of 100 grades of stainless steel, 80 grades of copper and 60 grades of carbon steel, wherein the numerical range of the relative corrosion rate alpha of each adjacent grade differs by one order of magnitude, and determining the numerical range of the relative corrosion rate alpha of 40 grades and 20 grades by analogy on the basis of the numerical range; the constructed corrosion resistance grading evaluation table is as follows:
s2, measuring the relative corrosion rate alpha of the target sample: weighing and recording a target sample with a smooth surface and a comparison sample, placing the target sample and the comparison sample in a corrosion box in parallel for a soil accelerated corrosion comparison experiment, weighing and recording the target sample with the smooth surface and the comparison sample of Q235 carbon steel, placing the target sample and the comparison sample of Q235 carbon steel in the corrosion box in parallel, controlling the temperature and the humidity of experimental soil to be 45 ℃ and 25 percent, standing for more than 15 days, taking out the samples, removing surface corrosion products, weighing and recording. And (3) measuring the relative corrosion rate alpha of the target sample after corrosion, wherein the relative corrosion rate calculation method comprises the following steps: subtracting the weight of the soil after the accelerated corrosion comparison experiment from the initial weight of the target sample and the Q235 carbon steel comparison sample to obtain the weight loss W of the target sample and the weight loss W of the Q235 carbon steel comparison sample0Calculating the exposure area S of the target sample and the exposure area S of the comparative sample of Q235 carbon steel according to the sample size0The relative corrosion rate α of the target specimen was calculated as follows:
s3, scoring the target sample: and searching corresponding scores in the corrosion resistance grading evaluation table according to the relative corrosion rate alpha of the target sample, and recording the scores as the score value of the target sample.
Example (b): and (4) evaluating the corrosion resistance of the pure copper grounding material in a grading manner.
1. Soil accelerated corrosion comparison experiment: weighing and recording a pure copper sample with a smooth surface and a Q235 carbon steel comparison sample, then parallelly placing the sample and the comparison sample in a corrosion box, controlling the soil thickness in each direction to be more than 50mm, controlling the temperature and the humidity of experimental soil to be 45 ℃ and 25%, standing for 30 days, taking out the sample, removing a surface corrosion product, weighing and recording.
2. Calculating the relative corrosion rate: subtracting the weight of the soil after the accelerated corrosion comparison experiment from the initial weight of the pure copper sample and the Q235 carbon steel comparison sample to obtain the weight loss W of the target sample which is 0.0279g and the weight loss W of the Q235 carbon steel comparison sample0The exposed area S of the target specimen was calculated to be 15.7cm from the specimen size (0.4062 g)2Exposed area S of comparative sample with Q235 carbon steel0＝15.6cm2The relative corrosion rate α of the target specimen was calculated as 0.06825:
3. grading and evaluating the corrosion resistance: the relative corrosion rate of the pure copper grounding material is 0.06825, and the corrosion resistance of the pure copper grounding material is 80 points according to the table.
The invention only provides a pure copper grounding material evaluation case, and the valuable grounding materials comprise hot-dip galvanized steel, pure copper, copper-coated steel, zinc-coated steel, stainless steel-coated steel, conductive anticorrosive coating steel and the like. The relative corrosion rate alpha can also be selected from comparison samples made of other materials, and the alpha value range in the corresponding corrosion resistance grading evaluation table is properly adjusted.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. The method for graded evaluation of the corrosion resistance of the grounding material is characterized by comprising the following steps of:
s1, constructing a corrosion resistance grading evaluation table: selecting a sample made of a certain material as a comparison sample, selecting typical grounding materials on the market, namely stainless steel, copper and carbon steel, as scoring reference samples, placing a large number of scoring reference samples and the comparison sample in a corrosion box to perform a soil accelerated corrosion comparison experiment, performing the experiment statistics on the relative corrosion rate alpha of each scoring reference sample, determining the numerical range of the relative corrosion rate alpha of 100 minutes, 80 minutes and 60 minutes according to the relative corrosion rate alpha of each scoring reference sample counted by the experiment according to the scoring reference basis of 100 minutes, 80 minutes and 60 minutes of stainless steel, and determining the numerical range of the relative corrosion rate alpha of each adjacent grade by one order of magnitude, and determining the numerical range of the relative corrosion rate alpha of 40 minutes and 20 minutes by analogy according to the numerical range;
s2, measuring the relative corrosion rate alpha of the target sample: weighing and recording a target sample with a smooth surface and a comparison sample, placing the target sample and the comparison sample in a corrosion box in parallel to perform a soil accelerated corrosion comparison experiment, and measuring the relative corrosion rate alpha of the target sample after corrosion;
s3, scoring the target sample: and searching corresponding scores in the corrosion resistance grading evaluation table according to the relative corrosion rate alpha of the target sample, and recording the scores as the score value of the target sample.
2. The method for graded evaluation of corrosion resistance of grounding material according to claim 1, wherein the relative corrosion rate α is measured with a Q235 carbon steel sample as a comparison sample.
3. The method for graded evaluation of corrosion resistance of grounding material according to claim 1, wherein the graded evaluation table of corrosion resistance is as follows:
4. the method for graded evaluation of corrosion resistance of grounding material according to claim 1, wherein the grounding material comprises hot-dip galvanized steel, pure copper, copper-clad steel, zinc-clad steel, stainless steel-clad steel, conductive anti-corrosion coating steel.
5. The method for graded evaluation of corrosion resistance of grounding material according to claim 1, wherein the soil accelerated corrosion comparison experiment process is as follows: weighing and recording a target sample with a smooth surface and a Q235 carbon steel comparison sample, then parallelly placing the sample and the comparison sample in a corrosion box, controlling the soil thickness in each direction to be more than 50mm, controlling the temperature and the humidity of experimental soil to be 45 ℃ and 25%, standing for more than 15 days, taking out the sample, removing a surface corrosion product, weighing and recording.
6. The method for graded evaluation of corrosion resistance of grounding material according to claim 5, wherein the relative corrosion rate calculation method comprises: subtracting the weight of the soil after the accelerated corrosion comparison experiment from the initial weight of the target sample and the Q235 carbon steel comparison sample to obtain the weight loss W of the target sample and the weight loss W of the Q235 carbon steel comparison sample0Calculating the exposure area S of the target sample and the exposure area S of the comparative sample of Q235 carbon steel according to the sample size0The relative corrosion rate α of the target specimen was calculated as follows:
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| CN113740140A (en) * | 2021-07-30 | 2021-12-03 | 淮浙电力有限责任公司凤台发电分公司 | Method for acquiring failure risk level of ferrite steel welded joint for thermal power plant |
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