CN112251756A - System and method for evaluating dynamic direct-current corrosion risk of buried metal pipeline - Google Patents
System and method for evaluating dynamic direct-current corrosion risk of buried metal pipeline Download PDFInfo
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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
- 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
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
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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 buried metal pipeline dynamic direct current corrosion risk evaluation system and a buried metal pipeline dynamic direct current corrosion risk evaluation method.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of detection and evaluation of stray current of oil and gas pipelines, and particularly relates to a system and a method for evaluating dynamic direct-current corrosion risk of a buried metal pipeline.
[ background of the invention ]
With the rapid development of the transportation and energy industry, the situations that the buried metal pipeline and the rail transportation line are laid in parallel or in a crossed manner are more and more, and the problem of dynamic direct current stray current interference of the buried metal pipeline caused by the situations is more and more severe. Due to the complexity and unpredictability of a direct current stray current leakage path in the rail transit system and the continuous change of the position of a train on a rail during operation, the direct current stray current generated by the rail transit system has dynamic fluctuation characteristics, and the direction and the magnitude of the current 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 the dynamic direct current stray current interference suffered by the buried metal pipeline and how to judge the corrosion risk of the buried metal pipeline under the dynamic direct current stray current interference becomes a problem concerned by pipeline corrosion prevention workers.
At present, no judgment standard and method specially aiming at the corrosion risk of the buried metal pipeline under the condition of the dynamic direct current stray current interference of the rail transit exist in the prior art. Although the existing standard and evaluation method such as GB50991-2014 buried steel pipeline direct current interference protection technical standard provides a corresponding evaluation index for identifying and evaluating the direct current interference of the pipeline, and provides a method for judging the interference intensity of the pipeline without cathode protection by adopting an offset value of the pipe-to-ground potential relative to the natural potential, the potential offset evaluation index is suitable for the interference situation of steady-state direct current stray current, and for the situation of dynamic direct current interference, because the pipe-to-ground potential always changes in positive and negative fluctuation, the pipe-to-ground potential at which moment or how to process the ground potential on the pipe is selected for evaluation, and the standard does not describe; for the pipeline implementing the cathodic protection, although an index is provided for judging whether the polarization potential of the pipeline meets the cathodic protection standard, for the buried pipeline suffering from the interference of the dynamic direct current stray current, the polarization potential of the pipeline is generally obtained by utilizing the instantaneous power failure of the inspection plate, according to the field detection experience, the instantaneous power failure potential of the inspection plate also fluctuates, the situation that the instantaneous power failure potential of the inspection plate is equal to the minimum protection potential occurs at part of moments, at the moment, how to judge the interference intensity of the stray current is realized, the number and degree of potentials which do not meet the standard requirements in a large range can be accepted, and the standard is not described. 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.
Accordingly, there is a need to develop a system and method for evaluating the risk of dynamic dc corrosion of buried metal pipelines that addresses the deficiencies of the prior art to address or mitigate one or more of the problems set forth above.
[ summary of the invention ]
In view of the above, the invention provides a system and a method for evaluating the corrosion risk of a buried metal pipeline under the condition of track traffic dynamic direct current stray current interference, which are particularly applied to evaluating the corrosion risk of the buried metal pipeline under the condition of track traffic dynamic direct current stray current interference, comprehensively consider whether the pipeline implements cathodic protection, and consider the difference that the pipeline reaches the minimum protection potential standard of cathodic protection in different environment media, and also consider the dynamic fluctuation of the pipe-to-ground potential under the condition of track traffic stray current interference.
On one hand, the invention provides a dynamic direct current evaluation method for corrosion risks of buried metal pipelines, which comprises the following steps:
s1: acquiring basic parameters of pipeline corrosion;
s2: determining whether the corrosion rate parameter is contained or not according to the parameters obtained in the S1, if so, performing S3, and if not, performing S4;
s3: judging the corrosion risk according to the corrosion rate of the pipeline;
s4: determining whether cathodic protection is applied according to the parameters obtained in S1, if not, performing S5, and if so, performing S6;
s5: carrying out corrosion risk judgment according to the dynamic direct current corrosion judgment index under the condition of no cathode protection;
s6: and determining the minimum protection potential criterion of the pipeline reaching the cathodic protection according to the soil environment, and judging the corrosion risk according to the dynamic direct current corrosion judgment index under the cathodic protection condition.
The above-described aspects and any possible implementation further provide an implementation, wherein the basic parameters of pipeline corrosion in S1 include direct corrosion parameters including, but not limited to, corrosion rate, and indirect corrosion parameters including soil resistivity, natural corrosion potential of the pipeline without interference, continuously monitored pipeline energization potential, coupon polarization potential, and cathodic protection information.
The above-described aspect and any possible implementation manner further provide an implementation manner, where the method for obtaining the corrosion rate parameter includes: monitoring pipeline corrosion through a corrosion inspection sheet or a corrosion rate probe, wherein the monitoring time is at least 1 month;
the method for acquiring parameters of the undisturbed natural corrosion potential of the pipeline, the continuously monitored pipeline electrifying potential and the test piece polarization potential comprises the following steps: and after the monitoring duration is preset, continuously monitoring the pipeline at a specific sampling frequency to obtain dynamic potential data, wherein the preset monitoring duration is at least 24 hours, and the specific sampling frequency is 1-10 s/time.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, and the method for judging the corrosion risk according to the corrosion rate of the pipeline in S3 specifically includes:
when V iscorrWhen the thickness is less than or equal to 0.025mm/a, the judgment result is as follows: the corrosion risk is low;
when it is 0.025<VcorrWhen the thickness is less than or equal to 0.1mm/a, the judgment result is as follows: corrosion risk is moderate;
when V iscorr>When the grain size is 0.1mm/a, the judgment result is as follows: the corrosion risk is high;
wherein VcorrIs the corrosion rate of the pipe.
The above-mentioned aspects and any possible implementation manner further provide an implementation manner, and the method for evaluating corrosion risk according to the dynamic dc corrosion evaluation index under the condition without cathode protection in S5 specifically includes:
wherein E isoffFor polarization potential of the pipe, EcorrIs the natural corrosion potential t when the pipelines in the same environment are not interfered20For presetting the polarization potential E of the pipeline within the monitoring timeoffRelative natural corrosion potential EcorrThe forward deviation is 20mV, and T is the preset monitoring time;
when χ is less than or equal to 5%, the judgment result is as follows: the corrosion risk is low;
when the χ is less than or equal to 15 percent, the judgment result is as follows: corrosion risk is moderate;
when χ is larger than 15%, the judgment result is as follows: the risk of corrosion is high.
In the above aspect and any possible implementation manner, there is further provided an implementation manner, in the S6, the minimum protection potential E for achieving cathodic protection of the pipeline is determined according to the soil resistivitycpThe method comprises the following steps:
in oxygen-free soil or water environments, Ecp＝-0.85VCSE；
Under the temperature condition Tem<40℃，100Ω·m<Resistivity of soil rho<1000. omega. m, in oxygen-containing soils or water environments, Ecp＝＝-0.75VCSE；
Under the temperature condition Tem<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE；
Under the temperature condition Tem>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE；
Under the temperature condition of 40 DEG C<Tem<Soil or water environment at 60 ℃, EcpDetermined by linear interpolation between a potential value at 40 ℃ and a potential value at 60 ℃;
in anoxic soils or water environments containing the risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
The above aspects, and any possible implementations, further provide an implementation,determination of E by the Linear interpolation methodcpThe method comprises the following specific steps: by setting the potential value at 40 ℃ to-0.65VCSE、-0.75VCSE、-0.85VCSEor-0.95VCSESetting potential value at 60 deg.C to-0.95VCSEPerforming linear interpolation to determine Ecp。
The above aspect and any possible implementation manner further provide an implementation manner, and the specific method for performing corrosion risk assessment according to the dynamic dc corrosion assessment indicator under the cathodic protection condition in S6 is as follows:
wherein E isoffFor polarization potential of the pipe, EcpThe minimum protection potential for cathodic protection is reached for the pipeline in the same environment,
for presetting the polarization potential E of the pipeline within the monitoring timeoffPositive to the minimum protective potential EcpTime of (t)50For presetting the polarization potential E of the pipeline within the monitoring timeoffRelative minimum protection potential EcpTime of forward shift of 50 mV; t is t100For polarizing the potential E of the pipeoffRelative minimum protection potential EcpThe forward deviation is 100mV, and T is the preset monitoring time;
when alpha is less than or equal to 5 percent, beta is less than or equal to 2 percent and gamma is less than or equal to 1 percent, the judgment result is as follows: the corrosion risk is low;
when 5% < alpha ≦ 20%, 2% < beta ≦ 15%, and 1% < gamma ≦ 5%, the evaluation results are: corrosion risk is moderate;
when α > 20%, β > 15%, or γ > 5%, the evaluation results are: the risk of corrosion is high.
The above-mentioned aspects and any possible implementation manner further provide a dynamic direct current evaluation system for corrosion risk of buried metal pipelines, which includes:
the data acquisition module is used for periodically acquiring basic parameters of pipeline corrosion;
the corrosion rate evaluation module is used for evaluating the corrosion risk when the basic pipeline corrosion parameters comprise corrosion rate parameters;
the cathodic protection evaluation module is used for evaluating corrosion risks when the corrosion basic parameters of the pipeline do not contain corrosion rate parameters and cathodic protection is applied to the pipeline;
and the non-cathode protection judging module is used for judging the corrosion risk when the corrosion basic parameters of the pipeline do not contain the corrosion rate parameters and the pipeline is not applied with cathode protection.
The above-mentioned aspects and any possible implementation manner further provide a dynamic direct current evaluation system for corrosion risk of a buried metal pipeline, which includes: the dynamic evaluation program of the corrosion risk of the buried metal pipeline is executed by the processor to realize the steps of any dynamic direct current evaluation method of the corrosion risk of the buried metal pipeline.
The above-mentioned aspects and any possible implementation manner further provide a computer readable storage medium, on which a dynamic evaluation program of corrosion risk of a buried metal pipeline is stored, and when being executed by a processor, the dynamic evaluation program of corrosion risk of a buried metal pipeline realizes the steps of any one of the dynamic direct current evaluation methods of corrosion risk of a buried metal pipeline.
Compared with the prior art, the invention can obtain the following technical effects:
1): the method confirms a corrosion rate-based evaluation index, provides a corrosion risk evaluation index of the buried pipeline under the condition of dynamic direct-current stray current interference of rail transit, periodically obtains basic corrosion parameters outside the buried metal pipeline, and respectively evaluates the corrosion rate data according to whether the parameters include corrosion rate data and whether cathode protection is applied; dynamically judging the corrosion risk in different periods;
2) whether the pipeline is subjected to cathodic protection or not and the difference that the pipeline reaches the minimum protection potential of cathodic protection in different environment media are considered in corrosion risk evaluation, and meanwhile, the time proportion of polarization potential offset to different reference potentials is provided for corrosion risk judgment aiming at the dynamic fluctuation of the pipeline potential under the condition of stray current interference of rail transit, so that the method has important significance for comprehensively and systematically judging the dynamic direct current stray current corrosion risk of the buried pipeline, and engineering technicians can conveniently and accurately evaluate the dynamic direct current stray current corrosion risk of the buried pipeline.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the 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 embodiments will be briefly described 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 these drawings without creative efforts.
Fig. 1 is a flowchart of a dynamic dc evaluation method according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a dynamic direct current evaluation method, a dynamic direct current evaluation system and a readable storage medium for corrosion risks of buried metal pipelines, wherein the risk evaluation method specifically comprises the following steps:
step 1): obtaining basic parameters of pipeline corrosion, wherein the basic parameters of the pipeline corrosion comprise corrosion rate, soil resistivity, undisturbed natural corrosion potential of the pipeline, and continuously monitored pipeline electrifying potential and test piece polarization potential.
Step 2): if the corrosion rate data is obtained, judging the corrosion risk according to the pipe corrosion rate, and judging the corrosion risk according to the pipeline corrosion basic parameter corrosion rate;
step 3): if the corrosion rate data is not obtained, judging according to whether the cathodic protection and the polarization potential monitoring data are applied to the pipeline;
step 4): if the pipeline is not applied with cathode protection, corrosion risk judgment is carried out according to the dynamic direct current corrosion judgment index under the condition of no cathode protection;
step 5): and if cathodic protection is applied, determining that the pipeline reaches the minimum protection potential criterion of cathodic protection according to the soil environment, and judging the corrosion risk according to the dynamic direct current corrosion judgment index under the cathodic protection condition.
The basic parameters of the corrosion of the medium pipeline comprise a direct corrosion parameter and an indirect corrosion parameter, wherein the direct corrosion parameter comprises but is not limited to a corrosion rate, and the indirect corrosion parameter comprises soil resistivity, an undisturbed natural corrosion potential of the pipeline, a continuously monitored pipeline electrifying potential, a test piece polarization potential and cathodic protection information.
The method for acquiring the corrosion rate parameters comprises the following steps: monitoring pipeline corrosion through a corrosion inspection sheet or a corrosion rate probe, wherein the monitoring time is at least 1 month;
the method for acquiring parameters of the undisturbed natural corrosion potential of the pipeline, the continuously monitored pipeline electrifying potential and the test piece polarization potential comprises the following steps: and after the monitoring duration is preset, continuously monitoring the pipeline at a specific sampling frequency to obtain dynamic potential data, wherein the preset monitoring duration is at least 24 hours, and the specific sampling frequency is 1-10 s/time.
The invention relates to a method for evaluating corrosion risks of a dynamic direct-current stray current of rail transit, wherein the specific method for evaluating the corrosion risks according to the corrosion rate of a pipeline comprises the following steps:
according to NACE0169, when corrosion rate VcorrWhen the thickness is less than or equal to 0.025mm/a, the corrosion risk is low;
according to a large amount of data of field excavation and corrosion inspection sheets, the data is determined to be 0.025<VcorrWhen the corrosion risk is less than or equal to 0.1mm/a, the corrosion risk is in a medium level;
according to a large amount of data of field excavation and corrosion inspection sheets, the V is determinedcorr>At 0.1mm/a, the risk of corrosion is high.
The invention relates to a method for evaluating corrosion risk of a dynamic direct-current stray current of rail transit, wherein the specific method for evaluating the corrosion risk according to a dynamic direct-current corrosion evaluation index under a non-cathodic protection condition comprises the following steps: according to a large amount of data of field excavation and corrosion inspection sheets, determining EoffFor polarization potential of the pipe, EcorrIs the natural corrosion potential when the pipeline is not interfered in the same environment, and chi is the polarization potential E of the pipelineoffRelative natural corrosion potential EcorrThe time proportion of 20mV of positive deviation is adopted, and when χ is less than or equal to 5%, the corrosion risk is low; when the content is 5 percent<χ<At 15%, the corrosion risk is moderate; when χ is more than or equal to 15%, the corrosion risk is high.
According to the method for evaluating the corrosion risk of the dynamic direct current stray current of the rail transit, if cathodic protection is applied to a pipeline, the corrosion risk is determined according to the resistivity of soilThe pipeline reaches the minimum protection potential E of cathodic protectioncpThe method comprises the following specific steps: obtaining E according to GB/T21448 index valuecpThe method further comprises the following steps: in general soil or water environments, Ecp＝-0.85VCSE(ii) a At a temperature Tem<40℃，100Ω·m<Resistivity of soil rho<1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.75VCSE(ii) a At a temperature Tem<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE(ii) a At a temperature Tem>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE(ii) a At 40 DEG C<Temperature Tem<Soil or water environment at 60 ℃, EcpPotential value at 40 deg.C (-0.65V)CSE，-0.75VCSE，-0.85VCSEor-0.95VCSE) And a potential value of (-0.95V) at 60 DEG CCSE) Is determined by linear interpolation; anoxic soil or water environments with risk of corrosion by sulfate-reducing bacteria (SRB), Ecp＝-0.95VCSE。
According to the method for evaluating the corrosion risk of the dynamic direct current stray current of the rail transit, if the cathodic protection is applied to the pipeline, the specific method for evaluating the corrosion risk according to the dynamic direct current corrosion evaluation index under the cathodic protection condition comprises the following steps:
according to a large amount of data of field excavation and corrosion inspection sheets, determining 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 polarization potential E of the pipeoffRelative minimum protection potential EcpTime proportion of positive deviation of 50mV, gamma is pipe polarization potential EoffRelative minimum protection potential EcpThe forward deviation is 100mV, when alpha is less than or equal to 5 percent, beta is less than or equal to 2 percent and gamma is less than or equal to 1 percent, the corrosion risk is low; when the content is 5 percent<Alpha is less than or equal to 20 percent and 2 percent<Beta is less than or equal to 15 percent and 1 percent<When gamma is less than or equal to 5 percent, the corrosion risk is in a medium level; when alpha is>20% or beta>15% or gamma>At 5%, the risk of corrosion is high.
Compared with the prior art, the method for evaluating the corrosion risk of the dynamic direct current stray current of the track traffic is different in that an evaluation index based on the corrosion rate is confirmed and a corrosion risk evaluation index of the buried pipeline under the condition of the dynamic direct current stray current interference of the track traffic is provided. Whether the cathodic protection is implemented on the pipeline or not is considered in corrosion risk evaluation, the pipeline reaches the difference of the minimum protection potential of the cathodic protection in different environment media, meanwhile, the corrosion risk evaluation is carried out according to the time proportion of polarization potential deviation from different reference potentials aiming at the dynamic fluctuation of the pipeline potential under the condition of stray current interference of rail transit, the dynamic direct current stray current corrosion risk evaluation of the buried pipeline comprehensively and systematically has important significance, and engineering technicians can conveniently and reasonably and accurately evaluate the dynamic direct current stray current corrosion risk of the buried pipeline.
Example 1:
to achieve the object of the present invention, a large amount of data of in-situ corrosion test piece burying test and laboratory simulation experiment are collected, and first, the corrosion rate V is determinedcorrIn 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
In the process of evaluating the corrosion risk of the dynamic direct current stray current of the rail transit, if the corrosion rate of the pipeline can be tested and obtained through a corrosion weightlessness inspection sheet, an ER corrosion probe, an online detection device or other proven effective detection methods, the corrosion risk of the pipeline can be evaluated according to the test result of the corrosion rate.
Based on corrosion rates V obtained in the field and in the laboratory under different interference conditions when corrosion rate data cannot be obtained directlycorrAnalyzing the correlation with the interference parameter, establishing a corrosion rate evaluation model, comprehensively considering the field feasibility, and determining the dynamic direct-current corrosion risk evaluation under the condition of not applying cathodic protectionThe indexes and the evaluation indexes of the dynamic DC corrosion risk under the cathodic protection condition are shown in tables 2-3 respectively.
TABLE 2 evaluation index of corrosion risk of buried steel pipeline without cathodic protection under dynamic DC stray current interference of rail transit
TABLE 3 evaluation index of corrosion risk of buried steel pipeline with cathodic protection under dynamic DC stray current interference of rail transit
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) for carbon steel materials:
1) general soil or water environment, Ecp＝-0.85VCSE；
2)40℃<T<Soil or water environment at 60 ℃, EcpPotential value at 40 deg.C (-0.65V)CSE，-0.75VCSE，-0.85VCSEor-0.95VCSE) And a potential value of (-0.95V) at 60 DEG CCSE) Is determined by linear interpolation.
3)T>Soil or water environment at 60 ℃, Ecp＝-0.95VCSE。
4)T<40℃，100Ω·m<ρ<1000. omega. m, oxygen-containing soil or water environment, Ecp＝-0.75VCSE。
5)T<40℃，ρ>1000. omega. m, oxygen-containing soil or water environment, Ecp＝-0.65VCSE。
6) Anoxic soil or water environment with risk of corrosion by Sulfate Reducing Bacteria (SRB), Ecp ═ 0.95VCSE。
Example (b):
(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) The city gas pipeline is interfered by dynamic DC stray current, no cathodic protection is applied, and natural corrosion potential E iscorris-0.73VCSEPolarization potential of pipeline EoffRelative natural corrosion potential EcorrThe time of forward deviation of 20mV is 648s, the total test time is 5675s, the time proportion chi of forward deviation of 20mV of the polarization potential of the pipeline relative to the natural corrosion potential is 11%, the corrosion rate is 0.069mm/y, and the corrosion risk of the pipeline is a medium level.
(3) 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-0.85VCSEFor 130s, polarization potential E of the pipeoffIs more than-0.8VCSEFor 6s, polarization potential E of the pipelineoffIs more than-0.75VCSEThe time of (1) is 0s, the total test time is 4626s, the time proportion alpha of the polarization potential of the pipeline being in the protection potential standard is 3%, the time proportion beta of the polarization potential of the pipeline being in the protection potential standard plus 50mV is 0.1%, the time proportion gamma of the polarization potential of the pipeline being in the protection potential standard plus 100mV is 0%, the corrosion rate is 0.015mm/a, and the corrosion risk of the pipeline is low.
(4) 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-0.65VCSEFor 19s, polarization potential E of the pipeoffIs more than-0.6VCSEFor 1s, polarization potential E of the pipeoffIs more than-0.55VCSEThe time of (1) is 0s, the total test time is 2597s, the time proportion alpha of the polarization potential of the pipeline being in the protection potential standard is 0.7%, and the time proportion beta of the polarization potential of the pipeline being in the protection potential standard plus 50mVThe corrosion rate is 0.007mm/a, the corrosion risk of the pipeline is low, and the corrosion rate is 0.04%, the time proportion gamma of the polarization potential of the pipeline being in the protection potential standard plus 100mV is 0%.
The system and the method for evaluating the dynamic direct-current corrosion risk of the buried metal pipeline provided by the embodiment of the application are introduced in detail. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A method for evaluating the dynamic direct current corrosion risk of a buried metal pipeline is characterized by comprising the following steps:
s1: acquiring basic parameters of pipeline corrosion;
s2: determining whether the corrosion rate parameter is contained or not according to the parameters obtained in the S1, if so, performing S3, and if not, performing S4;
s3: judging the corrosion risk according to the corrosion rate of the pipeline;
s4: determining whether cathodic protection is applied according to the parameters obtained in S1, if not, performing S5, and if so, performing S6;
s5: carrying out corrosion risk judgment according to the dynamic direct current corrosion judgment index under the condition of no cathode protection;
s6: and determining the minimum protection potential criterion of the pipeline reaching the cathodic protection according to the soil environment, and judging the corrosion risk according to the dynamic direct current corrosion judgment index under the cathodic protection condition.
2. The dynamic direct current evaluation method according to claim 1, wherein the basic parameters of pipeline corrosion in S1 include direct corrosion parameters including but not limited to corrosion rate and indirect corrosion parameters including soil resistivity, natural corrosion potential of the pipeline without interference, continuously monitored pipeline energization potential, specimen polarization potential and cathodic protection information.
3. The dynamic direct current evaluation method according to claim 2, wherein the corrosion rate parameter obtaining method comprises: monitoring pipeline corrosion through a corrosion inspection sheet or a corrosion rate probe, wherein the monitoring time is at least 1 month;
the method for acquiring parameters of the undisturbed natural corrosion potential of the pipeline, the continuously monitored pipeline electrifying potential and the test piece polarization potential comprises the following steps: and after the monitoring duration is preset, continuously monitoring the pipeline at a specific sampling frequency to obtain dynamic potential data, wherein the preset monitoring duration is at least 24 hours, and the specific sampling frequency is 1-10 s/time.
4. The dynamic direct current evaluation method according to claim 1, wherein the method for evaluating the corrosion risk according to the corrosion rate of the pipeline in S3 specifically comprises:
when V iscorrWhen the thickness is less than or equal to 0.025mm/a, the judgment result is as follows: the corrosion risk is low;
when it is 0.025<VcorWhen the thickness is less than or equal to 0.1mm/a, the judgment result is as follows: corrosion risk is moderate;
when V iscorr>When the grain size is 0.1mm/a, the judgment result is as follows: the corrosion risk is high;
wherein VcorrIs the corrosion rate of the pipe.
5. The dynamic direct current evaluation method according to claim 3, wherein the method for evaluating corrosion risk according to the dynamic direct current corrosion evaluation index under the condition of no cathode protection in S5 specifically comprises:
wherein E isoffFor polarization potential of the pipe, EcorrIs the natural corrosion potential t when the pipelines in the same environment are not interfered20For presetting the polarization potential E of the pipeline within the monitoring timeoffRelative natural corrosion potential EcorrThe forward deviation is 20mV, and T is the preset monitoring time;
when χ is less than or equal to 5%, the judgment result is as follows: the corrosion risk is low;
when the χ is less than or equal to 15 percent, the judgment result is as follows: corrosion risk is moderate;
when χ is larger than 15%, the judgment result is as follows: the risk of corrosion is high.
6. The dynamic direct current evaluation method according to claim 5, wherein the minimum protection potential E for achieving cathodic protection of the pipeline is determined according to the resistivity of the soil in S6cpThe method comprises the following steps:
in oxygen-free soil or water environments, Ecp＝-0.85VCSE；
Under the temperature condition Tem<40℃，100Ω·m<Resistivity of soil rho<1000. omega. m, in oxygen-containing soils or water environments, Ecp＝＝-0.75VCSE；
Under the temperature condition Tem<Resistivity of soil rho at 40 DEG C>1000. omega. m, oxygen-containing soil or water environment, Ecp＝＝-0.65VCSE；
Under the temperature condition Tem>Soil or water environment at 60 ℃, Ecp＝＝-0.95VCSE；
Under the temperature condition of 40 DEG C<Tem<Soil or water environment at 60 ℃, EcpDetermined by linear interpolation between a potential value at 40 ℃ and a potential value at 60 ℃;
in anoxic soils or water environments containing the risk of corrosion by sulfate-reducing bacteria, Ecp＝-0.95VCSE。
7. The dynamic DC evaluation method according to claim 6, wherein the linear interpolation method determines EcpThe method comprises the following specific steps: by setting the potential value at 40 ℃ to-0.65VCSE、-0.75VCSE、-0.85VCSEor-0.95VCSESetting potential value at 60 deg.C to-0.95VCSEPerforming linear interpolation to determine Ecp。
8. The dynamic direct current evaluation method according to claim 7, wherein the specific method for evaluating the corrosion risk according to the dynamic direct current corrosion evaluation index under cathodic protection in S6 is as follows:
wherein E isoffFor polarization potential of the pipe, EcpThe minimum protection potential for cathodic protection is reached for the pipeline in the same environment,
for presetting the polarization potential E of the pipeline within the monitoring timeoffPositive to the minimum protective potential EcpTime of (t)50For presetting the polarization potential E of the pipeline within the monitoring timeoffRelative minimum protection potential EcpTime of forward shift of 50 mV; t is t100For polarizing the potential E of the pipeoffRelative minimum protection potential EcpThe forward deviation is 100mV, and T is the preset monitoring time;
when alpha is less than or equal to 5 percent, beta is less than or equal to 2 percent and gamma is less than or equal to 1 percent, the judgment result is as follows: the corrosion risk is low;
when 5% < alpha ≦ 20%, 2% < beta ≦ 15%, and 1% < gamma ≦ 5%, the evaluation results are: corrosion risk is moderate;
when α > 20%, β > 15%, or γ > 5%, the evaluation results are: the risk of corrosion is high.
9. A dynamic dc evaluation system of corrosion risk of buried metal pipelines, comprising the dynamic dc evaluation method of any one of claims 1 to 8, wherein the dynamic dc evaluation system comprises:
the data acquisition module is used for periodically acquiring basic parameters of pipeline corrosion;
the corrosion rate evaluation module is used for evaluating the corrosion risk when the basic pipeline corrosion parameters comprise corrosion rate parameters;
the cathodic protection evaluation module is used for evaluating corrosion risks when the corrosion basic parameters of the pipeline do not contain corrosion rate parameters and cathodic protection is applied to the pipeline;
and the non-cathode protection judging module is used for judging the corrosion risk when the corrosion basic parameters of the pipeline do not contain the corrosion rate parameters and the pipeline is not applied with cathode protection.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a dynamic program for evaluating the corrosion risk of a buried metal pipeline, which when executed by a processor implements the steps of the method for dynamically evaluating the corrosion risk of a buried metal pipeline according to any one of claims 1 to 8.
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