CN113945508A - Device for testing corrosion influence of power grid on buried pipe network - Google Patents
Device for testing corrosion influence of power grid on buried pipe network Download PDFInfo
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Abstract
The invention discloses a device for testing the corrosion influence of a power grid on a buried pipe network, which comprises at least three soil boxes, wherein test soil is filled in each soil box, the pH value of the test soil in each soil box is different, a pipeline simulation test piece and a graphite electrode are also embedded in each soil box, the pipeline simulation test piece and the graphite electrode in the at least three soil boxes are connected in series with an alternating current power supply to form a test loop, and an ammeter is connected in series in the test loop and used for measuring alternating current flowing on the pipeline simulation test piece; after the corrosion test of the pipeline simulation test piece is completed by the test device, taking out the corroded pipeline simulation test piece and removing a surface corrosion product; and then weighing the pipeline simulation test piece, and calculating to obtain the corrosion rate of the pipeline simulation test piece. The invention can simulate the corrosion condition of the buried oil and gas pipeline under the alternating current interference after the anticorrosive coating is damaged in different soil environments when the power grid normally operates.
Description
Technical Field
The invention relates to the technical field of power transmission engineering, in particular to a device for testing the corrosion influence of a power transmission network on a buried pipe network.
Background
When the power grid normally transmits power, the alternating electromagnetic field can generate induced voltage on an adjacent oil and gas pipeline. If the alternating current transmission line is too close to the oil gas pipeline or the parallel coupling relationship is too strong, the voltage to earth of the pipeline is high, the normal work of construction, maintenance or measurement personnel can be influenced, and the pipeline can be corroded in serious cases.
Therefore, experimental research on the corrosion influence of the power grid on the buried pipe network needs to be carried out, and the method has a great reference value for operation maintenance and corrosion prevention of the buried oil and gas pipe network.
Disclosure of Invention
The invention aims to provide a test device for the corrosion influence of a power grid on a pipe network, which is convenient for carrying out a corrosion influence test of the power grid on a buried pipe network and simulating the corrosion condition of the buried oil and gas pipeline under alternating current interference after an anticorrosive coating is damaged under different soil environments when the power grid normally operates.
In order to solve the technical problems, the invention adopts the following technical scheme: the device comprises at least three soil boxes, wherein test soil is filled in each soil box, the pH value of the test soil in each soil box is different, a pipeline simulation test piece and a graphite electrode are also embedded in each soil box, the pipeline simulation test piece and the graphite electrode in the at least three soil boxes are connected in series with an alternating current power supply to form a test loop, and an ammeter is connected in series in the test loop and used for measuring alternating current flowing on the pipeline simulation test piece; after the corrosion test of the pipeline simulation test piece is completed by the test device, taking out the corroded pipeline simulation test piece and removing a surface corrosion product; then weighing the pipeline simulation test piece to obtain W1, and calculating to obtain the corrosion rate of the pipeline simulation test piece as shown in the following formula:
wherein v is the corrosion rate, g/(m)2·h)；W0Mass g before corrosion of the test piece; w1Mass after removal of corrosion products, g; s is the metal surface area of the pipe simulation test piece m2(ii) a t is corrosion time h; by introducing the density (g/cm) of the steel2) The corrosion weight loss rate v of the pipeline simulation test piece is converted into average corrosion depth d, mm/a, and the corrosion rate of the pipeline simulation test piece in the experiment is expressed according to the average corrosion depth d, mm/a.
Preferably, the actual soil is selected and ground by a stick, sieved by a sieve, the sieved soil is dried in a drying oven at 105 ℃ to constant weight, a soil sample is weighed, water is added to adjust the water content of the soil to 20%, and the pH value of the soil is adjusted to a preset value by adding deionized water, acetic acid and sodium hydroxide reagents.
Preferably, three soil boxes are selected, and the pH of the soil in the three soil boxes is 4.5, 7, 8.5, which simulates acid soil, neutral soil and alkaline soil, respectively.
Preferably, the size of the pipeline simulation test piece is 20mm multiplied by 3mm, the surface of the test piece is polished to a mirror surface by sand paper, absolute ethyl alcohol is used for cleaning and removing oil, tap water is used for washing or scrubbing to remove insoluble dirt, the test piece is placed into the absolute ethyl alcohol for soaking and dehydrating for 5min after being dried by blowing, cold air is used for drying after being taken out, a 200mm lead is welded on the back surface of the test piece, the welding lead surface and four side surfaces are sealed by epoxy resin AB glue, and W0 is weighed after being cured to be accurate to 0.1 mg.
Preferably, the output voltage of the AC power supply is adjusted in the test to obtain current densities of 0, 10, 20, 30, 50, 100, 150A/m respectively2The corrosion period is 240 h.
Preferably, the process of treating the corroded pipeline simulation test piece comprises the following steps: firstly, mechanically cleaning the sample by using a soft brush in running water to remove loose or loose corrosion products attached to the sample; and then soaking the test piece in a pickling solution for 10min, fully washing the test piece by using tap water to remove residual corrosion products on the surface of the test piece, washing the test piece by using distilled water, then thoroughly washing the test piece in ethanol, drying the test piece by using a blower or drying the test piece in an oven, and cooling the test piece in a dryer to room temperature.
According to the technical scheme, the exposed test piece made of the same material as the pipe is connected through the lead, so that the defects of the pipeline anticorrosive coating are simulated, and the test piece is buried in soil environments with different pH values. The induced voltage generated on the pipeline is simulated by using an alternating current power supply, the current flowing through the test piece is measured by an ammeter, and the corrosion rate of the test piece is calculated by a weight loss method. Therefore, the corrosion condition of the buried oil and gas pipeline under the alternating current interference after the anticorrosive coating is damaged in different soil environments can be simulated when the power grid normally operates.
The following detailed description and the accompanying drawings are included to provide a further understanding of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic diagram of a test circuit structure according to the present invention.
FIG. 2 is a graph showing the corrosion rate of a test piece in relation to current density.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
The corrosion influence experiment of the power grid on the buried pipe network adopts a corrosion test piece weight loss method, and the principle is that a bare test piece with the same material as a pipe material is connected through a lead so as to simulate the defect of a pipeline anticorrosive coating and be buried in soil environments with different pH values. The induced voltage generated on the pipeline is simulated by using an alternating current power supply, the current flowing through the test piece is measured by an ammeter, and the corrosion rate of the test piece is calculated by a weight loss method. Therefore, the corrosion condition of the buried oil and gas pipeline under alternating current interference after the anticorrosive coating is damaged in different soil environments when the power grid normally operates is determined.
As shown in figure 1, the corrosion influence test device of the power grid on the buried pipe network comprises at least three soil boxes, test soil is filled in each soil box, the pH value of the test soil in each soil box is different, a pipeline simulation test piece and a graphite electrode are further buried in each soil box, the pipeline simulation test piece and the graphite electrode in at least three soil boxes are connected in series with an alternating current power supply to form a test loop, and an ammeter is connected in series in the test loop and used for measuring alternating current flowing on the pipeline simulation test piece.
Experimental methods
(1) Tabletting
The size of the metal test piece for corrosion test is 20mm multiplied by 3mm, and the metal test piece is X70 grade pipeline steel. Polishing the surface of the test piece with sand paper to a mirror surface, cleaning with absolute ethyl alcohol to remove oil, washing with tap water or brushing to remove insoluble dirt, drying with dry water, soaking in absolute ethyl alcohol to dehydrate for about 5min, taking out, drying with cold air, wrapping with clean white paper, and drying for later use. After the test piece is dried, a wire with the thickness of 200mm is welded on the back surface of the test piece by using an electric iron, the surface and four side surfaces of the welded wire are sealed by using epoxy resin AB glue, and after the welding wire is solidified, W0 is weighed to the accuracy of 0.1 mg.
(2) Soil medium preparation
And (5) establishing a cuboid soil box. Actual soil is filled in the box, the soil in the soil box is ground by a wooden stick and sieved by a sieve (the mesh number of the sieve can be selected as required), and the soil quality is ensured. And (3) drying the screened soil sample in a drying oven at 105 ℃ for 8 hours until the weight is constant. Weighing a certain mass of soil sample, and adding a proper amount of water to adjust the water content of the soil to be 20%. The pH value of the soil is adjusted to a preset value by adding deionized water, acetic acid and sodium hydroxide reagents.
(3) Platform construction
In the experiment process, alternating current is provided by a voltage regulator, the output is connected with a graphite electrode, three kinds of soil with different pH values are used as a group for carrying out experiments, an ammeter is connected in series in a loop, the alternating current flowing on a test piece is tested, and the test loop is shown in figure 1.
In the experiment, pH 4.5, pH 7 and pH 8.5 are selected to respectively simulate acid soil, neutral soil and alkaline soil, output voltage is adjusted, and current densities of 0, 10, 20, 30, 50, 100 and 150A/m are sequentially obtained2The ac interference of (2). The etching period is 240 h. In the experiment period, the current of the experiment loop is monitored regularly, the pH value of the experiment soil is tested, and if the experiment soil has a large deviation sign from a preset value, the experiment soil is adjusted immediately.
(4) Post-experimental treatment
And after the corrosion test is finished, taking out the metal test piece, and observing and recording the macroscopic morphology of the test piece before cleaning. According to the relevant provisions of "removal of corrosion products from corrosion samples of metals and alloys", a gentle mechanical cleaning is carried out in running water with a soft brush to remove the loosely adhered or loosened corrosion products. Thereafter, the test piece was immersed in the pickling solution for 10 min. And then fully washing with tap water to remove residual corrosion products on the surface of the test sample, washing with distilled water, then thoroughly washing in ethanol, drying by using a blower or drying in an oven, and cooling the test piece in a dryer to room temperature.
And weighing the corrosion test piece to obtain W1, and calculating to obtain the corrosion rate. As shown in the following formula:
wherein v is the corrosion rate, g/(m)2·h)；W0Mass g before corrosion of the test piece; w1Mass after removal of corrosion products, g; s is the sample metal surface area, m2(ii) a t is the etching time, h. By introducing the density (g/cm) of the steel2) The corrosion weight loss rate v of the test piece is converted into an average corrosion depth d, mm/a, and the corrosion rate of the test piece in the experiment is expressed by the average corrosion depth d, mm/a.
Finally, the experimental results are analyzed.
(1) Morphology of corrosion
And recording the corrosion morphology of the test piece after 10 days of corrosion in different soil environments and under the alternating current density and the surface morphology of the test piece after acid pickling. Comparing the corrosion shapes of the self-corrosion test piece and the alternating current corrosion test piece, and analyzing the change condition of the corrosion product on the surface of the test piece and the damage degree of the surface of the test piece under different alternating current interference strengths.
As the intensity of the AC interference is increased, the corrosion products on the surface of the test piece are increased gradually, and when the AC interference is weaker, the corrosion product layer is thin and the surface of the test piece is not completely corroded. When the AC interference degree is stronger, the corrosion product layer is thick and the surface of the test piece is completely corroded, which indicates that the AC corrosion is increased along with the increase of the AC interference strength. Comparing the corrosion morphology of the natural corrosion test piece with that of the alternating current corrosion test piece to obtain: the corrosion products on the ac corrosion coupon were much more numerous than those on the native corrosion coupon, indicating that ac interference significantly accelerated corrosion. Comparing the corrosion conditions of test pieces in different acid and alkali soils to obtain: the corrosion of the test piece in the acidic and neutral soil is serious, the corrosion of the test piece in the alkaline soil is inhibited to a certain extent, and the corrosion condition is light. Compared with alternating current interference, the influence of the soil pH value on the corrosion of the test piece is small.
After acid washing, the test piece surface of the natural corrosion group is flat, and the test piece surface in neutral and alkaline soil is slightly corroded and basically not damaged except for obvious corrosion traces on the test piece surface under the acid soil condition. After the alternating current interference is applied, the surface of the sample is obviously damaged, and along with the enhancement of the alternating current interference degree, the damage degree of the surface is increased, and the corrosion is more serious. Comparing the surface damage of the samples at each ac current density gives: and when the alternating current interference is small, the corrosion of the sample is relatively uniform. When the ac interference increases, local corrosion tends to start, and pitting corrosion occurs on the surface of the sample. Indicating that the ac interference has the effect of promoting localized corrosion.
(2) Effect of AC interference on Corrosion Rate
The corrosion weight loss of the test piece under different AC current densities is shown in Table 1. The strip corrosion rates at different ac current densities are shown in figure 2. The AC interference can significantly accelerate the corrosion of the test piece. 30A/m2Under the condition of alternating current density, the corrosion weight loss of the test piece is increased by 5-10 times. The corrosion weight loss of the coupon continues to increase with increasing ac interference intensity. Of three different pH soil media, the test piece has the most serious weight loss in acid soil and the least corrosion weight loss in alkaline soil.
When 0 < iac＜30A/m2In the process, the corrosion rate of the test piece is rapidly increased along with the increase of the alternating current density, and an obvious acceleration process appears. When 30 < iac＜100A/m2The corrosion rate of the test piece increases more gradually. The corrosion rate of the test piece under the AC interference does not increase linearly.
Table 1: corrosion weightlessness and corrosion rate meter for test piece under different AC current densities
(3) Pipeline corrosion assessment based on corrosion depth
With the increase of the corrosion depth, the material strength of the pipeline is continuously reduced, and when the depth of the corrosion pit is developed to the maximum allowable corrosion depth in the state, the pipeline is easy to have perforation failure accidents.
Perforation failure model: z ═ g (t, d) ═ α t-d
d＝vT
In the formula: alpha is corrosion coefficient, t is pipe wall thickness, mm; d is the depth of the corrosion defect, mm; v is the average corrosion rate, mm/a; t is the running time, a.
The value of alpha is usually 80% to 100%, and it is specified in B31G that the defect depth cannot exceed 80% of the wall thickness. When the limit condition Z <0, a pipe puncture failure occurs. Considering the buried pipeline according to 15 years, the corrosion depth of the pipeline is obtained according to the corrosion rate of the pipeline and the design life of the pipeline. The corrosion condition of the pipeline is evaluated according to the evaluation standard of Table 2 for X70 grade pipeline steel (phi 1016mm multiplied by 14.6mm) widely applied in West-east gas transmission engineering.
Table 2: evaluation of degree of corrosion of pipe
The results were summarized to obtain the evaluation results of the corrosion status of the pipeline under the conditions of different strengths of ac interference, as shown in table 3.
Table 3: AC interference corrosion estimating meter for pipeline
As can be seen from table 3, the ac interference significantly accelerates the corrosion of the pipe, increasing the risk of pipe perforation. When i isac>30A/m2The effect of ac interference on corrosion of the pipe cannot be neglected. In contrast, the corrosion rate of the test piece in acid soil is faster, and the test piece is more attractive.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (6)
1. The device is characterized by comprising at least three soil boxes, wherein test soil is filled in each soil box, the pH value of the test soil in each soil box is different, a pipeline simulation test piece and a graphite electrode are also embedded in each soil box, the pipeline simulation test piece and the graphite electrode in the at least three soil boxes are connected in series with an alternating current power supply to form a test loop, and an ammeter is connected in series in the test loop and used for measuring alternating current flowing on the pipeline simulation test piece;
after the corrosion test of the pipeline simulation test piece is completed by the test device, taking out the corroded pipeline simulation test piece and removing a surface corrosion product; then weighing the pipeline simulation test piece to obtain W1, and calculating to obtain the corrosion rate of the pipeline simulation test piece as shown in the following formula:
wherein v is the corrosion rate, g/(m)2·h)；W0Mass g before corrosion of the test piece; w1Mass after removal of corrosion products, g; s is the metal surface area of the pipe simulation test piece m2(ii) a t is corrosion time h; and (3) converting the corrosion weight loss rate v of the pipeline simulation test piece into an average corrosion depth d, mm/a by introducing the density of the steel, and expressing the corrosion rate of the pipeline simulation test piece in the experiment.
2. The device for testing the corrosion influence of the power grid on the buried pipe network according to claim 1, characterized in that: selecting actual soil, grinding the actual soil by using a stick, sieving the actual soil by using a sieve, drying the sieved soil in a drying oven at 105 ℃ to constant weight, weighing a soil sample, adding water to adjust the water content of the soil to be 20%, and adding deionized water, acetic acid and a sodium hydroxide reagent to adjust the pH value of the soil to a preset value.
3. The device for testing the corrosion influence of the power grid on the buried pipe network according to claim 2, characterized in that: three soil boxes were selected and the pH of the soil in the three soil boxes was 4.5, 7, 8.5, simulating acid soil, neutral soil and alkaline soil, respectively.
4. The device for testing the corrosion influence of the power grid on the buried pipe network according to claim 1, characterized in that: the size of the pipeline simulation test piece is 20mm multiplied by 3mm, the surface of the test piece is polished to a mirror surface by sand paper, absolute ethyl alcohol is used for cleaning and removing oil, then tap water is used for washing or scrubbing to remove insoluble dirt, the test piece is placed into the absolute ethyl alcohol after being dried by blowing, the test piece is soaked and dehydrated for 5min, the test piece is taken out and dried by cold air, a 200mm lead is welded on the back surface of the test piece, the welded lead surface and four side surfaces are sealed by epoxy resin AB glue, and W0 is weighed after being cured to be accurate to 0.1 mg.
5. The device for testing the corrosion influence of the power grid on the buried pipe network according to claim 1, characterized in that: in the test, the output voltage of the alternating current power supply is adjusted to obtain the current densities of 0, 10, 20, 30, 50, 100 and 150A/m respectively2The corrosion period is 240 h.
6. The device for testing the corrosion influence of the power grid on the buried pipe network according to claim 1, characterized in that: the process of treating the corroded pipeline simulation test piece comprises the following steps: firstly, mechanically cleaning the sample by using a soft brush in running water to remove loose or loose corrosion products attached to the sample; and then soaking the test piece in a pickling solution for 10min, fully washing the test piece by using tap water to remove residual corrosion products on the surface of the test piece, washing the test piece by using distilled water, then thoroughly washing the test piece in ethanol, drying the test piece by using a blower or drying the test piece in an oven, and cooling the test piece in a dryer to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111142065.6A CN113945508A (en) | 2021-09-28 | 2021-09-28 | Device for testing corrosion influence of power grid on buried pipe network |
| CN202111212813.3A CN114018798A (en) | 2021-09-28 | 2021-09-28 | Corrosion test device of power grid for buried oil and gas pipeline under alternating current interference |
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| CN202111142065.6A CN113945508A (en) | 2021-09-28 | 2021-09-28 | Device for testing corrosion influence of power grid on buried pipe network |
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| CN202111142065.6A Pending CN113945508A (en) | 2021-09-28 | 2021-09-28 | Device for testing corrosion influence of power grid on buried pipe network |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076438A (en) * | 2013-01-09 | 2013-05-01 | 浙江省电力公司电力科学研究院 | Laboratory simulation method for studying soil corrosion property |
| CN204649596U (en) * | 2015-04-29 | 2015-09-16 | 中国电力科学研究院 | The test unit of DC corrosion in a kind of simulated soil |
| CN111721619A (en) * | 2020-08-07 | 2020-09-29 | 中国海洋石油集团有限公司 | Corrosion evaluation method for corrosion-resistant alloy overlaying layer of underwater oil and gas facility |
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2021
- 2021-09-28 CN CN202111212813.3A patent/CN114018798A/en active Pending
- 2021-09-28 CN CN202111142065.6A patent/CN113945508A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076438A (en) * | 2013-01-09 | 2013-05-01 | 浙江省电力公司电力科学研究院 | Laboratory simulation method for studying soil corrosion property |
| CN204649596U (en) * | 2015-04-29 | 2015-09-16 | 中国电力科学研究院 | The test unit of DC corrosion in a kind of simulated soil |
| CN111721619A (en) * | 2020-08-07 | 2020-09-29 | 中国海洋石油集团有限公司 | Corrosion evaluation method for corrosion-resistant alloy overlaying layer of underwater oil and gas facility |
Non-Patent Citations (1)
| Title |
|---|
| 李源 等: "埋地钢质管道交流干扰腐蚀影响因素实验分析", 全面腐蚀控制 * |
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