CN113981453A - Method and device for evaluating stray current corrosion risk of gas pipe network with cathodic protection - Google Patents
Method and device for evaluating stray current corrosion risk of gas pipe network with cathodic protection Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 267
- 238000005260 corrosion Methods 0.000 title claims abstract description 267
- 238000004210 cathodic protection Methods 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 91
- 230000010287 polarization Effects 0.000 claims abstract description 52
- 238000011156 evaluation Methods 0.000 claims description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 7
- 241000894006 Bacteria Species 0.000 claims description 6
- 238000012360 testing method Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 238000007689 inspection Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/04—Controlling or regulating desired parameters
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/10—Controlling or regulating parameters
- C23F2213/11—Controlling or regulating parameters for structures subject to stray currents
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/32—Pipes
Abstract
The invention provides a method and a device for evaluating stray current corrosion risk of a gas pipe network with cathodic protection, wherein the method comprises the following steps: acquiring basic parameters of pipeline corrosion, wherein the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density; if the corrosion rate is obtained, judging the corrosion risk according to the corrosion rate; if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection; or judging according to the dynamic direct current corrosion judgment index under cathodic protection; or judging according to the cathodic protection criterion; or judging according to soil corrosivity indexes; and outputting the judgment result.
Description
Technical Field
The invention relates to the field of detection and evaluation of stray current of an oil-gas pipeline, in particular to a method and a device for evaluating the stray current corrosion risk of a gas pipe network with cathodic protection.
Background
With the rapid development of transportation, energy and power industries, the condition that buried metal pipelines are laid in parallel or in a crossed manner with rail transit lines and high-voltage transmission lines is increasing, and the problem of stray current interference of the buried metal pipelines caused by the condition is increasingly severe. For ac interference, more and more corrosion cases at home and abroad show that even a pipeline with a good cathodic protection level (such as cathodic protection potential of-1.1 VCSE), there is a risk of corrosion leakage (ac corrosion) under ac interference. Therefore, the conventional cathodic protection criterion of "-0.85 VCSE" no longer applies under ac interference. For subway direct current interference, due to complexity and unpredictability of direct current stray current leakage paths in the rail transit system and continuous change of positions of trains on rails during operation, direct current stray currents generated by the rail transit system have dynamic fluctuation characteristics, and the direction and the magnitude of the currents change randomly. For buried metal pipelines, alternating inflow and outflow of direct current stray current exist in the same region, alternating cathode and anode polarization of the bare metal surface at the position of a coating defect is caused, and the alternating cathode and anode polarization is reflected on the measurement result of the pipe-to-ground potential and is represented as dynamic positive and negative fluctuation of the potential. How to test the severity of stray current interference suffered by the buried metal pipeline and how to judge the corrosion risk of the cathode protection buried metal pipeline under the stray current interference becomes a problem concerned by pipeline corrosion prevention workers.
At present, the evaluation of stray current corrosion risks of a cathode protection gas pipe network at home and abroad is still controversial, particularly alternating current corrosion under high cathode protection and dynamic direct current corrosion under cathode protection. For alternating current interference, the national standard GB/T50698-2011 only adopts alternating current density to evaluate the alternating current corrosion risk of the buried metal pipeline, and does not consider the influence of cathode protection on the alternating current corrosion. Criteria for the evaluation of AC corrosion using the ratio of AC/DC current density are also given in the standards CEN/TS 15280-2013 and ISO 18086-2015. However, as the understanding of the occurrence of ac corrosion in pipes having cathodic protection systems has increased, researchers have found that when the ac current density is higher than a certain limit value, ac corrosion cannot be suppressed regardless of how the cathodic protection current density is adjusted. For direct current interference, although the existing standards and evaluation methods such as GB50991-2014 buried steel pipeline direct current interference protection technical standard provide corresponding evaluation indexes for direct current interference identification and evaluation of pipelines, and for pipelines implementing cathode protection, provide indexes for evaluation as to whether pipeline polarization potential meets the cathode protection standard, for buried pipelines suffering from dynamic direct current stray current interference, pipeline polarization potential is generally obtained by instantaneous power failure of inspection pieces, according to field detection experience, the instantaneous power failure potential of inspection pieces also fluctuates, and a situation that the instantaneous power failure potential of inspection pieces is equal to the minimum protection potential may occur at some moments, how to evaluate interference strength of stray current at this moment, the number and degree of potentials that do not meet the standard requirements within a large range may be accepted, and there is no description in the standards. Meanwhile, in the national standard GB50991-2014, the severity of the direct current interference is only divided into acceptable and unacceptable levels, and when the severity of the direct current interference is not acceptable, the corrosion risk of the pipeline is not further divided. Therefore, it is necessary to establish a judgment standard and a judgment method for the stray current corrosion risk of the cathodic protection gas pipe network.
Disclosure of Invention
The invention aims to provide a method and a device for evaluating the stray current corrosion risk of a gas pipe network with a cathode protection, which overcome the problems or at least partially solve the problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
one aspect of the invention provides a method for evaluating stray current corrosion risk of a gas pipe network with cathodic protection, which comprises the following steps: acquiring basic parameters of pipeline corrosion, wherein the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density; if the corrosion rate is obtained, judging the corrosion risk according to the corrosion rate to obtain a judgment result; if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain the judgment result; or judging according to the cathode protection criterion to obtain the judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein the alternating current corrosion evaluation index under cathodic protection comprises: the alternating current density and cathodic protection polarization potential; the dynamic direct current corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to a minimum protection potential and an average of polarization potentials, wherein the minimum protection potential is obtained by: determining the minimum protection potential for achieving cathodic protection of the pipeline according to the resistivity of the soil; and outputting the judgment result.
Wherein, theJudging the corrosion risk according to the corrosion rate, and obtaining a judgment result comprises the following steps: when corrosion rate VcorrWhen the thickness is less than or equal to 0.025mm/a, the corrosion risk is low; when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is moderate; when corrosion rate VcorrAnd when the thickness is more than or equal to 0.1mm/a, the corrosion risk is high.
Wherein, the judging according to the alternating current corrosion judging index under the cathodic protection comprises the following steps: at an alternating current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, the corrosion risk is moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>at-0.95V, the risk of corrosion is high; the judging according to the dynamic direct current corrosion judging index under the cathodic protection to obtain the judging result comprises the following steps: at an alternating current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThe corrosion risk is moderate; when alpha is more than or equal to 20 percent or beta is more than or equal to EcpThe risk of corrosion is high; the judging according to the cathodic protection criterion and the obtaining of the judging result comprises the following steps: when the AC and DC interference risk is low and the cathodic protection standard is met, the corrosion risk is low; the judgment is carried out according to the soil corrosivity index, and the judgment result obtained comprises the following steps: when the alternating current and direct current interference risk is low and the cathodic protection standard is not met, judging according to soil corrosivity indexes to obtain a judgment result; wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
Wherein determining that the pipeline reaches the minimum protection potential for cathodic protection according to soil resistivity comprises: in general soil or water environments, Ecp＝-0.85VCSE(ii) a At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE(ii) a At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE(ii) a At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE(ii) a At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method; anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
The invention provides a device for evaluating the stray current corrosion risk of a gas pipe network with cathodic protection, which comprises: the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring basic parameters of pipeline corrosion, and the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density; the judging module is used for judging the corrosion risk according to the corrosion rate if the corrosion rate is obtained, and obtaining a judging result; if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain the judgment result; or judging according to the cathode protection criterion to obtain the judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein the alternating current corrosion evaluation index under cathodic protection comprises: the alternating current density and cathodic protection polarization potential; the dynamic direct current corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to a minimum protection potential and an average of polarization potentials, wherein the minimum protection potential is obtained by: determining the minimum protection potential for achieving cathodic protection of the pipeline according to the resistivity of the soil; and the output module is used for outputting the judgment result.
The evaluation module evaluates the corrosion risk according to the corrosion rate in the following mode to obtain an evaluation result: the evaluation module is specifically used for judging whether the rotten object is rottenErosion rate VcorrWhen the corrosion rate is less than or equal to 0.025mm/a, the corrosion risk is judged to be low; when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is judged to be a medium level; when corrosion rate VcorrAnd when the corrosion rate is more than or equal to 0.1mm/a, the corrosion risk is judged to be high. .
The judgment module judges according to the alternating current corrosion judgment index under the cathodic protection in the following mode to obtain a judgment result: the evaluation module is particularly used for evaluating the alternating current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, corrosion risk was judged to be moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>-0.95V, the corrosion risk is judged to be high; the evaluation module carries out evaluation according to the dynamic direct current corrosion evaluation index under cathodic protection in the following mode to obtain the evaluation result: the evaluation module is particularly used for evaluating the alternating current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is judged to be low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThen, the corrosion risk was judged to be moderate; when alpha is more than or equal to 20 percent or beta is more than or equal to EcpIn time, the corrosion risk is judged to be high; the judging module judges according to the cathodic protection criterion in the following way to obtain the judging result: the evaluation module is specifically used for evaluating low corrosion risk when the alternating current and direct current interference risk is low and the cathodic protection standard is met; the evaluation module carries out evaluation according to soil corrosivity indexes in the following mode to obtain the evaluation result: the evaluation module is specifically used for evaluating according to soil corrosivity indexes when the alternating current and direct current interference risk is low and the cathodic protection standard is not met, so as to obtain an evaluation result; wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
Wherein determining that the pipeline reaches the minimum protection potential for cathodic protection according to soil resistivity comprises: in general soil or water environments, Ecp＝-0.85VCSE(ii) a At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE(ii) a At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE(ii) a At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE(ii) a At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method; anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
Therefore, the method and the device for evaluating the stray current corrosion risk of the gas pipe network with the cathodic protection confirm the evaluation index based on the corrosion rate and provide the evaluation index of the stray current corrosion risk of the gas pipe network with the cathodic protection. The influence of alternating current/direct current interference is comprehensively considered in corrosion risk evaluation, the difference that the pipeline reaches the minimum protection potential standard of cathodic protection in different environment media is considered, meanwhile, the corrosion risk judgment is carried out by using the time proportion of polarization potential deviation from different reference potentials and the average value of the polarization potential according to the dynamic fluctuation of the pipeline ground potential under the condition of stray current interference of rail transit, the stray current corrosion risk judgment of the buried pipeline with cathodic protection comprehensively and systematically has important significance, and engineering technicians can conveniently and accurately evaluate the stray current corrosion risk of the buried pipeline.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are 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 to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for evaluating a stray current corrosion risk of a gas pipe network with cathodic protection according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for evaluating the stray current corrosion risk of a gas pipe network with cathodic protection according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The core of the invention is that: the method for evaluating the stray current corrosion risk of the gas pipe network with the cathodic protection comprehensively considers the influence of alternating current/direct current interference, considers the difference that the pipeline reaches the minimum protection potential standard of the cathodic protection in different environment media, and simultaneously considers the dynamic fluctuation of the pipe-to-ground potential.
Fig. 1 shows a flowchart of a method for evaluating a stray current corrosion risk of a gas pipe network with cathodic protection according to an embodiment of the present invention, and referring to fig. 1, the method for evaluating a stray current corrosion risk of a gas pipe network with cathodic protection according to an embodiment of the present invention includes:
and S1, acquiring basic pipeline corrosion parameters, wherein the basic pipeline corrosion parameters comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density.
Specifically, the method collects a large amount of data of a field corrosion inspection piece burying test and a laboratory simulation test, so as to obtain basic parameters of pipeline corrosion, including corrosion rate, soil corrosivity, cathodic protection, continuously monitored test piece polarization potential, alternating current density parameters and the like.
And S21, if the corrosion rate is obtained, judging the corrosion risk according to the corrosion rate to obtain a judgment result.
As an embodiment of the inventionIn an alternative embodiment, the corrosion risk is judged according to the corrosion rate, and the obtaining of the judgment result comprises: when corrosion rate VcorrWhen the thickness is less than or equal to 0.025mm/a, the corrosion risk is low; when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is moderate; when corrosion rate VcorrAnd when the thickness is more than or equal to 0.1mm/a, the corrosion risk is high.
Specifically, the present invention first determines the corrosion rate VcorrIn order to evaluate the high, medium and low three-level evaluation indexes of the corrosion risk of the pipeline, the evaluation indexes are shown in table 1.
TABLE 1 Corrosion Rate based three-level index for pipeline corrosion Risk assessment
| External corrosion risk classification | Is low in | In | Height of |
| Corrosion rate Vcorr(mm/a) | ≤0.025 | 0.025～0.1 | ≥0.1 |
In the specific implementation, in the rail transit dynamic direct current stray current corrosion risk evaluation process, if the corrosion rate of the pipeline can be obtained through a corrosion weightlessness inspection sheet, an ER corrosion probe, an online detection device or other proven effective detection methods, the pipeline corrosion risk evaluation can be performed according to the corrosion rate test result.
S22, if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the cathode protection criterion to obtain a judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein, the alternating current corrosion evaluation indexes under cathodic protection comprise: alternating current density and cathodic protection polarization potential; the dynamic DC corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to the minimum protection potential and an average of the polarization potentials, wherein the minimum protection potential is obtained by: and determining the minimum protection potential for the pipeline to reach cathodic protection according to the resistivity of the soil.
Specifically, if no corrosion rate data is obtained, the evaluation is divided into the following three cases: 1. the alternating current density is more than or equal to 30A/m2Judging according to the alternating current corrosion judgment index under the cathodic protection; 2. the alternating current density is less than 30A/m2Judging according to the dynamic direct current corrosion judgment index under the cathodic protection if the electrified potential of the tube ground has obvious fluctuation; 3. in the absence of the above two conditions, the judgment was made according to the cathodic protection criteria and the soil corrosivity.
As an optional implementation manner of the embodiment of the invention, the judgment is carried out according to the alternating current corrosion judgment index under cathodic protection, and the obtained judgment result comprises the following steps: at an alternating current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, the corrosion risk is moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>at-0.95V, the risk of corrosion is high; judging according to the dynamic direct current corrosion judgment index under cathodic protection, and obtaining a judgment result, wherein the judgment result comprises the following steps: at an alternating current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThe corrosion risk is moderate; when alpha is more than or equal to 20 percentOr beta.gtoreq.EcpThe risk of corrosion is high; judging according to the cathodic protection criterion, and obtaining a judgment result, wherein the judgment result comprises the following steps: when the AC and DC interference risk is low and the cathodic protection standard is met, the corrosion risk is low; judging according to the soil corrosivity index, and obtaining a judgment result, wherein the judgment result comprises the following steps: when the alternating current and direct current interference risk is low and the cathodic protection standard is not met, judging according to soil corrosivity indexes to obtain a judgment result; wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
In specific implementation, when the corrosion rate data cannot be directly obtained, the corrosion rate V is obtained based on fields and laboratories under different interference conditionscorrAnd (3) analyzing the correlation with the interference parameters, establishing a corrosion rate evaluation model, comprehensively considering the field feasibility, and determining the AC and DC stray current corrosion risk evaluation indexes under the condition of applied cathodic protection, as shown in tables 2 and 3.
TABLE 2 evaluation index of AC stray current interference corrosion risk of buried steel pipeline with cathodic protection
TABLE 3 evaluation index of corrosion risk caused by interference of buried steel pipeline with cathodic protection
Wherein the minimum protection potential criterion in Table 3 is in accordance with the minimum cathodic protection potential E specified in section 4.4.2 of GB/T21448 Specification for cathodic protection of buried Steel pipelinescp(no IR drop) was determined.
As an alternative to the embodiment of the present invention, for carbon steel materials:
determining the minimum protection potential for the pipeline to reach cathodic protection according to the resistivity of the soil comprises:
in general soil or water environments, Ecp＝-0.85VCSE；
At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE；
At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE；
At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE；
At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method;
anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
And S3, outputting the judgment result.
Specifically, after the judgment result is obtained, the judgment result is output, and for example, the judgment result can be output to a display terminal so as to be conveniently viewed by a scientific research staff.
Specific examples of some judgments are provided below:
(1) when a certain pipeline is interfered by dynamic direct current stray current, the corrosion rate V of the pipeline steel is obtained through the burying test of a corrosion weightlessness inspection piececorrReaching 0.15mm/a and high corrosion risk of the pipeline.
(2) A certain pipeline is interfered by dynamic direct current stray current, the cathode protection system operates well, the environmental medium is red loam, the resistivity rho of the soil is 92.8 omega.m, and the minimum protection potential Ecptake-0.85VCSEPolarization potential of pipeline EoffIs more than-0.85VCSEThe time of (1) is 130s, the total test time is 4626s, the time proportion alpha of the pipeline polarization potential to the protection potential criterion is 3%, and the average value beta of the pipeline polarization potential is-0.98VCSEThe corrosion rate is 0.015mm/a, and the corrosion risk of the pipeline is low.
(3) When a certain pipeline is interfered by dynamic direct current stray current, the cathode protection system operates well, the environment medium is sandy soil, the resistivity rho of the soil is 1306 omega m, and the minimum protection potential Ecptake-0.65VCSEPolarization potential of pipeline EoffIs more than-0.65VCSEThe time of (1) is 19s, the total test time is 2597s, the time proportion alpha of the pipeline polarization potential to the protective potential criterion is 0.7%, and the average value beta of the pipeline polarization potential is-0.78VCSEThe corrosion rate is 0.007mm/a, and the corrosion risk of the pipeline is low.
Therefore, the method for evaluating the stray current corrosion risk of the gas pipe network with the cathodic protection confirms an evaluation index based on the corrosion rate, and provides the evaluation index of the stray current corrosion risk of the gas pipe network with the cathodic protection. The influence of alternating current/direct current interference is comprehensively considered in corrosion risk evaluation, the difference that the pipeline reaches the minimum protection potential standard of cathodic protection in different environment media is considered, meanwhile, the corrosion risk judgment is carried out by using the time proportion of polarization potential deviation from different reference potentials and the average value of the polarization potential according to the dynamic fluctuation of the pipeline ground potential under the condition of stray current interference of rail transit, the stray current corrosion risk judgment of the buried pipeline with cathodic protection comprehensively and systematically has important significance, and engineering technicians can conveniently and accurately evaluate the stray current corrosion risk of the buried pipeline.
Fig. 2 shows a schematic structural diagram of the device for evaluating the stray current corrosion risk of the gas pipe network with cathodic protection according to the embodiment of the present invention, where the device for evaluating the stray current corrosion risk of the gas pipe network with cathodic protection applies the above method, and only the structure of the device for evaluating the stray current corrosion risk of the gas pipe network with cathodic protection is briefly described below, and other things are not the case, please refer to the related description in the method for evaluating the stray current corrosion risk of the gas pipe network with cathodic protection, refer to fig. 2, and the device for evaluating the stray current corrosion risk of the gas pipe network with cathodic protection according to the embodiment of the present invention includes:
the system comprises an acquisition module, a data processing module and a data processing module, wherein the acquisition module is used for acquiring basic parameters of pipeline corrosion, and the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density;
the judging module is used for judging the corrosion risk according to the corrosion rate if the corrosion rate is obtained, and obtaining a judging result; if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the cathode protection criterion to obtain a judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein, the alternating current corrosion evaluation indexes under cathodic protection comprise: alternating current density and cathodic protection polarization potential; the dynamic DC corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to the minimum protection potential and an average of the polarization potentials, wherein the minimum protection potential is obtained by: determining the minimum protection potential for achieving cathodic protection of the pipeline according to the resistivity of the soil;
and the output module is used for outputting the judgment result.
As an optional implementation manner of the embodiment of the present invention, the evaluation module evaluates the corrosion risk according to the corrosion rate in the following manner to obtain an evaluation result: an evaluation module, in particular for the corrosion rate VcorrWhen the corrosion rate is less than or equal to 0.025mm/a, the corrosion risk is judged to be low; when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is judged to be a medium level; when corrosion rate VcorrAnd when the corrosion rate is more than or equal to 0.1mm/a, the corrosion risk is judged to be high.
As an optional implementation manner of the embodiment of the present invention, the evaluation module performs evaluation according to the ac corrosion evaluation index under cathodic protection in the following manner to obtain an evaluation result: evaluation module, in particular for determining the AC current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, corrosion risk was judged to be moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>-0.95V, the corrosion risk is judged to be high; the evaluation module carries out evaluation according to the dynamic direct current corrosion evaluation index under the cathodic protection in the following way to obtain an evaluation result: evaluation module, in particular for determining the AC current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is judged to be low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThen, the corrosion risk was judged to be moderate; when alpha is more than or equal to 20 percent or beta is more than or equal to EcpIn time, the corrosion risk is judged to be high; the evaluation module carries out evaluation according to the cathodic protection criterion in the following way to obtain an evaluation result: the judging module is specifically used for judging that the corrosion risk is low when the alternating current interference risk and the direct current interference risk are low and the cathodic protection standard is met; the evaluation module carries out evaluation according to the soil corrosivity index in the following mode to obtain an evaluation result: the evaluation module is specifically used for evaluating according to soil corrosivity indexes to obtain an evaluation result when the alternating current and direct current interference risk is low and the cathodic protection standard is not met; wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
As an alternative to the embodiments of the present invention, determining the minimum protection potential for the pipeline to reach cathodic protection according to the soil resistivity comprises: in general soil or water environments, Ecp＝-0.85VCSE(ii) a At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE(ii) a At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE(ii) a At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE(ii) a At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method; anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
Therefore, the device for evaluating the stray current corrosion risk of the gas pipe network with the cathodic protection confirms an evaluation index based on the corrosion rate, and provides the evaluation index of the stray current corrosion risk of the gas pipe network with the cathodic protection. The influence of alternating current/direct current interference is comprehensively considered in corrosion risk evaluation, the difference that the pipeline reaches the minimum protection potential standard of cathodic protection in different environment media is considered, meanwhile, the corrosion risk judgment is carried out by using the time proportion of polarization potential deviation from different reference potentials and the average value of the polarization potential according to the dynamic fluctuation of the pipeline ground potential under the condition of stray current interference of rail transit, the stray current corrosion risk judgment of the buried pipeline with cathodic protection comprehensively and systematically has important significance, and engineering technicians can conveniently and accurately evaluate the stray current corrosion risk of the buried pipeline.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A method for evaluating stray current corrosion risk of a gas pipe network with cathodic protection is characterized by comprising the following steps:
acquiring basic parameters of pipeline corrosion, wherein the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density;
if the corrosion rate is obtained, judging the corrosion risk according to the corrosion rate to obtain a judgment result;
if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain the judgment result; or judging according to the cathode protection criterion to obtain the judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein the alternating current corrosion evaluation index under cathodic protection comprises: the alternating current density and cathodic protection polarization potential; the dynamic direct current corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to a minimum protection potential and an average of polarization potentials, wherein the minimum protection potential is obtained by: determining the minimum protection potential for achieving cathodic protection of the pipeline according to the resistivity of the soil;
and outputting the judgment result.
2. The method of claim 1, wherein the assessing corrosion risk based on the corrosion rate comprises:
when corrosion rate VcorrWhen the thickness is less than or equal to 0.025mm/a, the corrosion risk is low;
when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is moderate;
when corrosion rate VcorrAnd when the thickness is more than or equal to 0.1mm/a, the corrosion risk is high.
3. The method of claim 1,
the judging according to the alternating current corrosion judging index under the cathodic protection, and the obtaining of the judging result comprises the following steps:
at an alternating current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, the corrosion risk is moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>at-0.95V, the risk of corrosion is high;
the judging according to the dynamic direct current corrosion judging index under the cathodic protection to obtain the judging result comprises the following steps:
at an alternating current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThe corrosion risk is moderate; when alpha is more than or equal to 20 percent or beta is more than or equal to EcpThe risk of corrosion is high;
the judging according to the cathodic protection criterion and the obtaining of the judging result comprises the following steps:
when the AC and DC interference risk is low and the cathodic protection standard is met, the corrosion risk is low;
the judgment is carried out according to the soil corrosivity index, and the judgment result obtained comprises the following steps:
when the alternating current and direct current interference risk is low and the cathodic protection standard is not met, judging according to soil corrosivity indexes to obtain a judgment result;
wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
4. The method of claim 3, wherein said determining that the pipe has reached said minimum protection potential for cathodic protection as a function of soil resistivity comprises:
in general soil or water environments, Ecp＝-0.85VCSE；
At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE；
At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE；
At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE；
At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method;
anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
5. The utility model provides a have cathodic protection gas pipe network stray current corrosion risk to judge device which characterized in that includes:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring basic parameters of pipeline corrosion, and the basic parameters of the pipeline corrosion comprise corrosion rate, soil corrosivity, cathodic protection, polarization potential and alternating current density;
the judging module is used for judging the corrosion risk according to the corrosion rate if the corrosion rate is obtained, and obtaining a judging result; if the corrosion rate is not obtained, judging according to the alternating current corrosion judgment index under the cathodic protection to obtain a judgment result; or judging according to the dynamic direct current corrosion judgment index under the cathodic protection to obtain the judgment result; or judging according to the cathode protection criterion to obtain the judgment result; or judging according to soil corrosivity indexes to obtain a judgment result; wherein the alternating current corrosion evaluation index under cathodic protection comprises: the alternating current density and cathodic protection polarization potential; the dynamic direct current corrosion evaluation indexes under cathodic protection comprise: a time proportion positive to a minimum protection potential and an average of polarization potentials, wherein the minimum protection potential is obtained by: determining the minimum protection potential for achieving cathodic protection of the pipeline according to the resistivity of the soil;
and the output module is used for outputting the judgment result.
6. The apparatus of claim 5, wherein the evaluation module evaluates the corrosion risk according to the corrosion rate to obtain an evaluation result by:
the evaluation module is used for judging the corrosion rate VcorrWhen the corrosion rate is less than or equal to 0.025mm/a, the corrosion risk is judged to be low; when it is 0.025<Corrosion rate Vcorr<At 0.1mm/a, the corrosion risk is judged to be a medium level; when corrosion rate VcorrAnd when the corrosion rate is more than or equal to 0.1mm/a, the corrosion risk is judged to be high.
7. The apparatus of claim 5,
the judging module judges according to the alternating current corrosion judging index under the cathodic protection in the following mode to obtain the judging result: the evaluation module is particularly used for evaluating the alternating current density iac≥30A/m2In this case, 30A/m2＜iac＜100A/m2and-1.20V<Eoff<at-0.95V, corrosion risk was judged to be moderate; when i isac≥100A/m2Or 30<iacr<100, and Eoff<-1.20V or Eoff>-0.95V, the corrosion risk is judged to be high;
the evaluation module carries out evaluation according to the dynamic direct current corrosion evaluation index under cathodic protection in the following mode to obtain the evaluation result: the evaluation module is particularly used for evaluating the alternating current density iac＜30A/m2In the following case: when alpha is less than or equal to 5 percent and beta is less than or equal to EcpThe corrosion risk is judged to be low; when the content is 5 percent<α<20 percent and beta is less than or equal to EcpThen, the corrosion risk was judged to be moderate; when alpha is more than or equal to 20 percent or beta is more than or equal to EcpIn time, the corrosion risk is judged to be high;
the judging module judges according to the cathodic protection criterion in the following way to obtain the judging result: the evaluation module is specifically used for evaluating low corrosion risk when the alternating current and direct current interference risk is low and the cathodic protection standard is met;
the evaluation module carries out evaluation according to soil corrosivity indexes in the following mode to obtain the evaluation result: the evaluation module is specifically used for evaluating according to soil corrosivity indexes when the alternating current and direct current interference risk is low and the cathodic protection standard is not met, so as to obtain an evaluation result;
wherein: eoffFor polarization potential of the pipe, EcpThe minimum protection potential criterion for achieving cathodic protection of the pipeline in the same environment is that alpha is the polarization potential E of the pipelineoffPositive to the minimum protective potential EcpBeta is the average value of the polarization potential of the pipeline.
8. The apparatus of claim 7, wherein said determining that the pipe has reached said minimum protection potential for cathodic protection as a function of soil resistivity comprises:
in general soil or water environments, Ecp＝-0.85VCSE；
At a temperature T<40℃，100<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE；
At a temperature T<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE；
At T>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE；
At 40 DEG C<T<Soil or water environment at 60 ℃, EcpThe electric potential value at 40 ℃ and the electric potential value at 60 ℃ are determined by a linear interpolation method;
anoxic soil or water environment with risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
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