CN117805009A - Quick test analysis method for corrosion resistance of circular tube - Google Patents
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Abstract
The invention relates to the field of material testing, in particular to a method for rapidly testing and analyzing corrosion resistance of a circular pipe, which comprises the following steps: s1, detecting circular tube sample data; s2, matching the type of the corrosive reagent; s3, detecting surface corrosion parameters; s4, analyzing the corrosion resistance of the surface; s5, detecting chemical corrosion parameters; s6, analyzing chemical corrosion resistance; s7, analyzing the surface parameters of the sample circular tube to obtain the surface corrosion resistance degree coefficient of the circular tube, analyzing the chemical corrosion resistance degree coefficient of the sample circular tube to obtain the chemical corrosion resistance degree coefficient of the circular tube, comparing the chemical corrosion resistance degree coefficient with preset corrosion resistance degree index thresholds of all levels to obtain the comprehensive corrosion resistance performance level of the circular tube, accurately evaluating the corrosion resistance of the circular tube, improving the quality control of the circular tube, optimizing the design and use, and ensuring the reliability and durability of the circular tube in a corrosion environment.
Description
Technical Field
The invention relates to the field of material testing, in particular to a method for rapidly testing and analyzing corrosion resistance of a circular tube pipeline.
Background
Circular pipe is a common form of pipe for transporting and distributing fluids, generally consisting of pipes of circular cross section, for transporting liquids, gases or other substances, and is widely used in the fields of industrial production, construction engineering, water supply transportation and distribution, etc., and generally has good hydrodynamic characteristics, easy to install and maintain, and therefore is a common choice in many engineering projects.
The corrosion resistance of round pipe pipes refers to the ability of the pipe material to resist corrosion when in contact with corrosive media, which is critical to many industrial applications because of the need for pipes to have good corrosion resistance when transporting and handling chemicals, wastewater, potable water, etc. to ensure safe and stable operation of the pipe system.
According to the technical scheme disclosed by China patent publication (patent No. 202310606038.2), corrosive vinegar liquid is injected into a pipeline to be detected, and the circulating pumps at two ends are utilized to drive the corrosive vinegar liquid to circularly flow along the inner wall of the pipeline, so that the corrosion process of the inner wall of the pipeline to be detected in a vinegar transportation state is simulated, and meanwhile, the corrosion effect of the corrosive vinegar liquid under different corrosion intensities on the inner wall of the pipeline to be detected is simulated by adjusting the concentration of the corrosive vinegar liquid, more comprehensive test data are provided, the durability of the pipeline is evaluated, the reliability and the safety of the pipeline are improved, and the defects still exist, namely: 1. the scheme aims at the fact that vinegar liquid is used as the only corrosion medium, the scheme cannot be suitable for the condition that other chemical substances exist, meanwhile, materials and surface treatment of pipelines are one of important factors influencing corrosion, pipelines of different materials can have different performances in a corrosion environment, the scheme does not consider the influence of material selection and surface treatment on corrosion, and if the materials and the surface treatment of the pipelines are inconsistent with the actual application, a corrosion simulation result of the scheme can deviate from the actual condition to some extent.
2. The corrosion condition variables related by the scheme are limited to corrosive liquids with different concentrations, however, in practical application, time factors in the corrosion process are very important, and the scheme does not relate to simulation of each corrosion duration, so that the corrosion degree of a pipeline and the influence of the corrosion degree on the service life of the pipeline under long-term operation cannot be accurately simulated and estimated, and all factors of the real environment cannot be completely represented.
Disclosure of Invention
In order to overcome the defects in the background technology, the embodiment of the invention provides a method for rapidly testing and analyzing the corrosion resistance of a circular pipe pipeline, which can effectively solve the problems related to the background technology.
The aim of the invention can be achieved by the following technical scheme: a quick test analysis method for corrosion resistance of a circular pipe comprises the following steps: s1, detecting circular tube sample data: sampling the circular tube to be detected, and detecting the material type of the circular tube.
S2, matching the type of the corrosive reagent: and matching corresponding corrosion reagents for the circular tube samples according to the material types of the circular tube pipelines.
S3, detecting surface corrosion parameters: and detecting the surface corrosion parameters of the circular tube sample at each time point under each concentration of corrosion reagent, wherein the surface corrosion parameters comprise a surface chromaticity value, corrosion quality and corrosion trace area.
S4, surface corrosion resistance analysis: according to the analysis of the surface corrosion parameters of the circular tube sample under each concentration of the corrosion reagent at each time point, the comprehensive corrosion rate and the corrosion degree of the circular tube sample under each concentration of the corrosion reagent are obtained, and further the surface corrosion resistance degree coefficient of the circular tube under each concentration of the corrosion reagent is obtained through analysis。
S5, detecting chemical corrosion parameters: and detecting chemical corrosion parameters of the circular tube sample under each concentration of corrosion reagent, wherein the chemical corrosion parameters comprise corrosion current density in each set potential range and content of each element component in corrosion products.
S6, chemical corrosion resistance analysis: obtaining the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosive agent according to the chemical corrosion parameter analysis of the round tube sample under each concentration of corrosive agent。
S7, analysis of comprehensive corrosion resistance: and analyzing the surface corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagent to obtain a comprehensive corrosion resistance degree index of the round tube, and comparing the comprehensive corrosion resistance degree index with preset corrosion resistance degree index thresholds of all levels to obtain the comprehensive corrosion resistance performance grade of the round tube.
Preferably, the specific analysis method of the type of the matching corrosive agent is as follows: the first step, the material type of the circular tube pipeline to be detected is obtained through a magnetic detection instrument, the circular tube pipeline is sampled according to the set volume, and the circular tube pipeline is recorded as each circular tube sample.
And reading the material types of the circular pipes corresponding to the corrosion reagents from the management database, matching the material types of the circular pipes with the material types of the circular pipes corresponding to the corrosion reagents, obtaining corrosion reagents corresponding to the material types of the circular pipes, marking the corrosion reagents as circular pipe sample corrosion reagents, respectively preparing corrosion reagents with different concentrations for the circular pipe samples according to set concentration differences, and placing the circular pipe samples in the corrosion reagents with the concentrations after the circular pipe samples are in one-to-one correspondence with the corrosion reagents with the concentrations, and marking the corrosion reagents as circular pipe samples with the concentrations.
Preferably, the specific analysis process of the surface corrosion parameter detection is as follows: the first step, a plurality of time points are taken from the test duration of the circular tube sample according to the set duration, the circular tube sample at each time point under each concentration of corrosive reagent is respectively subjected to image acquisition, the circular tube sample image at each time point under each concentration of corrosive reagent is marked, the chromaticity of each pixel point in the circular tube sample image at each time point under each concentration of corrosive reagent is respectively detected, and the circular tube sample image at each time point under each concentration of corrosive reagent is marked asWhereinRepresent the firstThe number of each concentration of the etching agent,，represent the firstThe number of the point in time is the number,，represent the firstThe number of the individual pixels is determined,substituting it into formulaObtaining the surface chromaticity value of the circular tube sample at each time point under each concentration of corrosive agent。
The second step, weigh the initial round tube sample, record as the round tube sample massAnd weighing round tube samples at each time point under each concentration of corrosive agent after the beginning of the test, and recording asBy the formulaObtaining the corrosion quality of the circular tube sample at each time point under each concentration of corrosion reagent。
Reading the round tube sample image of each time point under each concentration of corrosive reagent, converting the round tube sample image into a gray level image, detecting the gray level value of each pixel point, comparing the gray level value of each pixel point in the round tube sample image of each time point under each concentration of corrosive reagent with a set gray level threshold value, marking the pixel point which is larger than or equal to the set gray level threshold value as the round tube sample image corrosive pixel point of each time point under each concentration of corrosive reagent, and counting each time point under each concentration of corrosive reagentThe area of each corrosion pixel point is calculated and recorded as the corrosion trace area of the circular tube sample at each time point under each concentration of corrosion reagent。
Preferably, the specific analysis process of the comprehensive corrosion rate of the circular tube sample under each concentration of the corrosion reagent is as follows: firstly, reading the surface chromaticity value of a circular tube sample at each time point under each concentration of corrosive reagentSimultaneously extracting the time length between time points, and recording asSubstituting it into formulaObtaining the change rate of the chromaticity value of the surface of the circular tube sample under each concentration of corrosive agent，The number of time points is indicated,represent the firstFirst concentration of corrosive agentSurface colorimetric values for the tube samples at various time points.
Step two, the corrosion quality of the circular tube sample at each time point under each concentration of corrosion reagent is readRound tube sample under each concentration of corrosive agent at each timeCorrosion trace area of the interstitial sitesAccording to the method for analyzing the change rate of the chromaticity value of the surface of the circular tube sample under each concentration of corrosive agent, the change rate of the corrosion quality of the circular tube sample under each concentration of corrosive agent and the change rate of the corrosion trace area of the circular tube sample under each concentration of corrosive agent are obtained by the same analysis, and are recorded asAnd。
third, analyzing the comprehensive corrosion rate of the circular tube sample under each concentration of corrosive reagentThe formula is as follows:whereinWeight factors respectively representing the set change rate of the surface chromaticity value, the change rate of the corrosion quality and the change rate of the corrosion trace area, and。
preferably, the specific analysis process of the surface corrosion resistance analysis is as follows: the first step, the surface chromaticity value of the round tube sample at each time point under each concentration of corrosive agent is respectively readCorrosion quality of round tube sampleCorrosion trace area of round tube sampleBy the formulaObtaining the corrosion degree of the circular tube sample under each concentration of corrosive reagentWhereinDecibels represent the set reference values of the surface chromaticity value, corrosion quality and corrosion trace area of the circular tube sample,respectively represent the weight factors of the surface chromaticity value, the corrosion quality and the corrosion trace area of the circular tube sample, and，indicating the number of time points.
Step two, reading the comprehensive corrosion rate of the circular tube sample under each concentration of corrosion reagentSubstituting it into formulaObtaining the surface corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagentWhereinRespectively representing the set reference values of the comprehensive corrosion rate and the corrosion degree,weight factors respectively representing the comprehensive corrosion rate and corrosion degree of the circular tube sample,representing natural constants.
Preferably, the specific analysis process of the chemical corrosion parameter detection is as follows: the first step, after the set test time is over, dividing the potential range according to the set potential, applying voltage to the round tube sample under each concentration of corrosive agent in each set potential range, measuring the corresponding response current value of the round tube sample under each concentration of corrosive agent in each set potential range, and recording asWhereinRepresent the firstThe number of the potential range is set,simultaneously reading the cross-sectional area of the round tube sampleBy the formulaObtaining corrosion current density of circular tube sample in each set potential range under each concentration of corrosion reagent。
The second step, quantitatively collecting corrosion products of the circular tube samples under the corrosive agents of all concentrations, putting the corrosion products into an energy spectrometer, recording the corrosion products as corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, generating X-rays by exciting the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, collecting X-ray energy spectrum data, recording the X-ray energy spectrum data as energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, simultaneously extracting standard energy spectrum data from a management database, comparing the standard energy spectrum data with the energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations to obtain element components and element component contents in the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, and testing the corrosion test of all concentrationsThe content of each element component in the corrosion product sample of the circular tube sample under the agent is recorded asWhereinRepresent the firstThe number of the individual element components is set,。
preferably, the specific analysis method for analyzing the chemical corrosion resistance comprises the following steps: reading corrosion current density in each set potential range of circular tube sample under each concentration of corrosion reagentAnd the content of each element component in the corrosion product of the circular tube sample under each concentration of the corrosion reagentAnalyzing the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagentThe formula is as follows:whereinIndicate the set firstAt a concentration ofA reference value of the response current value of the circular tube sample in the potential range,indicate the set firstCorrosion product of round tube sample at various concentrationsReference values for the content of the individual elemental constituents,respectively representing the set response current value of the circular tube sample and the weight factors of the element content of the corrosion product of the circular tube sample.
Preferably, the specific analysis method for analyzing the comprehensive corrosion resistance comprises the following steps: the first step, the corrosion resistance degree coefficient of the surface of the round tube under each concentration of corrosion reagent is respectively readCoefficient of chemical resistance to corrosionSubstituting it into formulaObtaining the comprehensive corrosion resistance degree index of the round tubeWhereinIndicating the amount of the corrosive agent in concentration,the weight factors respectively represent the corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the surface.
And secondly, comparing the comprehensive corrosion resistance index of the circular tube with preset corrosion resistance index thresholds of all levels, screening to obtain the comprehensive corrosion resistance level of the circular tube, and feeding back.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects: 1. according to the invention, the material type of the circular pipe is detected, and the circular pipe sample is matched with the corresponding corrosion reagent according to the material type of the circular pipe, so that the corrosion condition under the actual use condition can be better simulated, and a more targeted corrosion performance evaluation result is provided.
2. According to the method, the comprehensive corrosion rate and corrosion degree of the circular tube sample under each concentration of the corrosion reagent are obtained according to the analysis of the surface parameters of the circular tube sample under each concentration of the corrosion reagent at each time point, so that the corrosion resistance degree coefficient of the circular tube under each concentration of the corrosion reagent is obtained through analysis, the corrosion condition of the circular tube under different time lengths can be more comprehensively known and evaluated, and the judgment of the corrosion degree and the corrosion rate and the influence of the corrosion duration on the service life of the pipeline are facilitated.
3. According to the invention, the chemical corrosion resistance degree coefficient of the circular tube under each concentration is obtained by analyzing the chemical corrosion resistance parameters of the circular tube sample under each concentration, the corrosion resistance of the circular tube can be quantized, and based on the chemical corrosion resistance degree coefficient of the circular tube under different reagent concentrations, proper materials and design corrosion prevention measures can be selected according to actual engineering requirements and environmental conditions, so that the reliability and safety of engineering are improved.
4. According to the method, the comprehensive corrosion resistance degree index of the circular tube is obtained by analyzing the surface corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the circular tube under each concentration of corrosion reagent, and is compared with the preset corrosion resistance degree index threshold value of each level, so that the comprehensive corrosion resistance performance grade of the circular tube is obtained, the corrosion resistance performance of the circular tube under different concentrations of the corrosion reagent can be more comprehensively measured, and a more accurate performance evaluation result is provided.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a method for rapidly testing and analyzing corrosion resistance of a circular pipe, which comprises the following steps: s1, detecting circular tube sample data: sampling the circular tube to be detected, and detecting the material type of the circular tube.
S2, matching the type of the corrosive reagent: and matching corresponding corrosion reagents for the circular tube samples according to the material types of the circular tube pipelines.
The specific analysis method of the type of the matched corrosive agent comprises the following steps: the first step, the material type of the circular tube pipeline to be detected is obtained through a magnetic detection instrument, the circular tube pipeline is sampled according to the set volume, and the circular tube pipeline is recorded as each circular tube sample.
Reading the material types of the circular pipes corresponding to the corrosion reagents from a management database, matching the material types of the circular pipes with the material types of the circular pipes corresponding to the corrosion reagents to obtain corrosion reagents corresponding to the material types of the circular pipes, marking the corrosion reagents as circular pipe sample corrosion reagents, respectively preparing corrosion reagents with different concentrations for the circular pipe samples according to set concentration differences, and putting the circular pipe samples in the corrosion reagents with the concentrations after the circular pipe samples are in one-to-one correspondence with the corrosion reagents with the concentrations, marking the corrosion reagents as circular pipe samples with the concentrations; by matching the material type of the pipeline with the corresponding corrosive agent, the selected corrosive agent is ensured to be suitable for the pipeline material, thereby being beneficial to more accurately simulating the corrosion condition in the practical application and improving the credibility of the simulation result.
S3, detecting surface corrosion parameters: and detecting the surface corrosion parameters of the circular tube sample at each time point under each concentration of corrosion reagent, wherein the surface corrosion parameters comprise a surface chromaticity value, corrosion quality and corrosion trace area.
The specific analysis process of the surface corrosion parameter detection is as follows: first, pressTaking a plurality of time points from the test time length of the circular tube sample according to the set time length, respectively obtaining images of the circular tube sample at each time point under each concentration of corrosive reagent, marking the images as circular tube sample images at each time point under each concentration of corrosive reagent, respectively detecting the chromaticity of each pixel point in the circular tube sample images at each time point under each concentration of corrosive reagent, marking the images asWhereinRepresent the firstThe number of each concentration of the etching agent,，represent the firstThe number of the point in time is the number,，represent the firstThe number of the individual pixels is determined,substituting it into formulaObtaining the surface chromaticity value of the circular tube sample at each time point under each concentration of corrosive agentThe method comprises the steps of carrying out a first treatment on the surface of the By detecting the chromaticity of each pixel point in the image, the color change of each position in the image can be quantitatively measuredAnd the corrosion condition of the surface of the circular tube at each time point is obtained, so that the corrosion condition is estimated more accurately and objectively.
The second step, weigh the initial round tube sample, record as the round tube sample massAnd weighing round tube samples at each time point under each concentration of corrosive agent after the beginning of the test, and recording asBy the formulaObtaining the corrosion quality of the circular tube sample at each time point under each concentration of corrosion reagentThe method comprises the steps of carrying out a first treatment on the surface of the By analyzing the corrosion quality of the circular tube samples at each interval time point under each concentration of the corrosion reagent, the corrosion resistance of the pipeline under different corrosion reagents and time points can be evaluated, the corrosion rate and the corrosion degree of the pipeline can be known, and the formulation of corrosion protection and maintenance measures can be further guided.
Reading the circular tube sample image of each time point under each concentration corrosive reagent, converting the circular tube sample image into a gray level image, detecting the gray level value of each pixel point, comparing the gray level value of each pixel point in the circular tube sample image of each time point under each concentration corrosive reagent with a set gray level threshold value, marking the pixel point which is larger than or equal to the set gray level threshold value as the circular tube sample image corrosive pixel point of each time point under each concentration corrosive reagent, counting each corrosive pixel point of the circular tube sample image of each time point under each concentration corrosive reagent, marking the area enclosed by the corrosive pixel point as the circular tube sample image corrosive trace area of each time point under each concentration corrosive reagent, calculating the area of the circular tube sample and marking the area as the corrosive trace area of the circular tube sample under each concentration corrosive reagent at each time pointThe method comprises the steps of carrying out a first treatment on the surface of the By edge extraction technique, each etching agent with each concentration can be extractedThe corrosion trace in the circular tube sample image at the interval time point is separated from the image, so that the corrosion part can be positioned and identified more accurately, the subsequent analysis and calculation are facilitated, the corrosion trace area of the circular tube sample at each interval time point under each concentration of corrosion reagent can be obtained by calculating the area of the edge profile, and the severity of the corrosion condition can be measured quantitatively.
S4, surface corrosion resistance analysis: according to the analysis of the surface corrosion parameters of the circular tube sample under each concentration of the corrosion reagent at each time point, the comprehensive corrosion rate and the corrosion degree of the circular tube sample under each concentration of the corrosion reagent are obtained, and further the surface corrosion resistance degree coefficient of the circular tube under each concentration of the corrosion reagent is obtained through analysis。
The specific analysis process of the comprehensive corrosion rate of the circular tube sample under each concentration of the corrosion reagent comprises the following steps: firstly, reading the surface chromaticity value of a circular tube sample at each time point under each concentration of corrosive reagentSimultaneously extracting the time length between time points, and recording asSubstituting it into formulaObtaining the change rate of the chromaticity value of the surface of the circular tube sample under each concentration of corrosive agent，The number of time points is indicated,represent the firstFirst concentration of corrosive agentSurface chromaticity values of the circular tube samples at each time point; the method can be used for comprehensively knowing the corrosion development condition by calculating the change rate of the chromaticity value and comparing and analyzing samples under the corrosive reagents with different concentrations, is favorable for confirming the corrosion rate, evaluating the corrosion resistance of the pipeline under the corrosive reagents with different concentrations and formulating corresponding protection and maintenance measures.
Step two, the corrosion quality of the circular tube sample at each time point under each concentration of corrosion reagent is readCorrosion trace area of round tube sample at each time point under each concentration of corrosive agentAccording to the method for analyzing the change rate of the chromaticity value of the surface of the circular tube sample under each concentration of corrosive agent, the change rate of the corrosion quality of the circular tube sample under each concentration of corrosive agent and the change rate of the corrosion trace area of the circular tube sample under each concentration of corrosive agent are obtained by the same analysis, and are recorded asAndthe method comprises the steps of carrying out a first treatment on the surface of the The development condition of the pipeline corrosion can be more comprehensively known by calculating the corrosion quality and the change rate of the corrosion trace area, the corrosion rate and the corrosion severity can be confirmed, corresponding protection and maintenance measures are formulated based on the data, and the safe and reliable operation of the pipeline is ensured.
Third, analyzing the comprehensive corrosion rate of the circular tube sample under each concentration of corrosive reagentThe formula is as follows:whereinWeight factors respectively representing the set change rate of the surface chromaticity value, the change rate of the corrosion quality and the change rate of the corrosion trace area, andthe method comprises the steps of carrying out a first treatment on the surface of the By comprehensively considering the information of the change rate of the surface colorimetric value, the change rate of the corrosion quality and the change rate of the area of the corrosion trace, the corrosion development condition can be estimated more comprehensively and objectively.
The specific analysis process of the surface corrosion resistance analysis is as follows: the first step, the surface chromaticity value of the round tube sample at each time point under each concentration of corrosive agent is respectively readCorrosion quality of round tube sampleCorrosion trace area of round tube sampleBy the formulaObtaining the corrosion degree of the circular tube sample under each concentration of corrosive reagentWhereinDecibels represent the set reference values of the surface chromaticity value, corrosion quality and corrosion trace area of the circular tube sample,respectively represent the weight factors of the surface chromaticity value, the corrosion quality and the corrosion trace area of the circular tube sample, and，representing the number of time points; by comprehensively considering a plurality of indexes such as the surface chromaticity value, the corrosion quality, the corrosion trace area and the like, a more comprehensive and objective corrosion degree evaluation result can be obtained, the overall condition of the corroded pipeline can be reflected more accurately, and the corresponding corrosion protection and maintenance strategies can be formulated.
Step two, reading the comprehensive corrosion rate of the circular tube sample under each concentration of corrosion reagentSubstituting it into formulaObtaining the surface corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagentWhereinRespectively representing the set reference values of the comprehensive corrosion rate and the corrosion degree,weight factors respectively representing the comprehensive corrosion rate and corrosion degree of the circular tube sample,representing natural constants.
S5, detecting chemical corrosion parameters: and detecting chemical corrosion parameters of the circular tube sample under each concentration of corrosion reagent, wherein the chemical corrosion parameters comprise corrosion current density in each set potential range and content of each element component in corrosion products.
The specific analysis process of the chemical corrosion parameter detection is as follows: the first step, after the set test time is over, dividing the potential range according to the set potential, applying voltage to the round tube sample under each concentration of corrosive agent in each set potential range, measuring the corresponding response current value of the round tube sample under each concentration of corrosive agent in each set potential range, and recording asWhereinRepresent the firstThe number of the potential range is set,simultaneously reading the cross-sectional area of the round tube sampleBy the formulaObtaining corrosion current density of circular tube sample in each set potential range under each concentration of corrosion reagentThe method comprises the steps of carrying out a first treatment on the surface of the The corrosion current density is an index for describing the corrosion current in a unit area, so that the corrosion degree and the corrosion rate can be known, the corrosion behavior of the round tube under different concentrations of corrosion reagents can be known more intuitively and accurately by the electrochemical corrosion evaluation method, and the corrosion condition can be analyzed quantitatively.
The second step, quantitatively collecting corrosion products of the circular tube samples under the corrosive agents of all concentrations, putting the corrosion products into an energy spectrometer, recording the corrosion products as corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, generating X-rays by exciting the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, collecting X-ray energy spectrum data, recording the X-ray energy spectrum data as energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, simultaneously extracting standard energy spectrum data from a management database, comparing the standard energy spectrum data with the energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations to obtain element components and element component contents in the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, recording the element component contents in the corrosion product samples of the circular tube samples of all concentrations asWhereinRepresent the firstThe number of the individual element components is set,the method comprises the steps of carrying out a first treatment on the surface of the The energy spectrum analysis method of the corrosion product sample can provide a nondestructive and quantitative analysis means for evaluating the components and the content of the corrosion product, is beneficial to understanding the corrosion behavior of the material in the corrosion process, and assists in formulating corresponding corrosion control and protection strategies.
S6, chemical corrosion resistance analysis: obtaining the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosive agent according to the chemical corrosion parameter analysis of the round tube sample under each concentration of corrosive agent。
The specific analysis method for analyzing the chemical corrosion resistance comprises the following steps: reading corrosion current density in each set potential range of circular tube sample under each concentration of corrosion reagentAnd the content of each element component in the corrosion product of the circular tube sample under each concentration of the corrosion reagentAnalyzing the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagentThe formula is as follows:whereinIndicate the set firstAt a concentration ofA reference value of the response current value of the circular tube sample in the potential range,indicate the set firstCorrosion product of round tube sample at various concentrationsReference values for the content of the individual elemental constituents,respectively representing the set response current value of the circular tube sample and the weight factors of the element content of the corrosion product of the circular tube sample; the chemical corrosion resistance analysis method can provide quantitative evaluation results, is used for comparing the corrosion resistance of the circular tube samples under different concentrations, assists in formulating proper corrosion protection measures, and can quantitatively compare the corrosion resistance of the circular tube samples under different concentrations by calculating chemical corrosion resistance degree coefficients, wherein the coefficients comprehensively consider the comparison of response current values of the circular tube samples under set concentrations and reference values and the comparison of element content of corrosion products and the reference values, and can provide more objective evaluation results.
S7, analysis of comprehensive corrosion resistance: and analyzing the surface corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagent to obtain a comprehensive corrosion resistance degree index of the round tube, and comparing the comprehensive corrosion resistance degree index with preset corrosion resistance degree index thresholds of all levels to obtain the comprehensive corrosion resistance performance grade of the round tube.
The specific analysis method for analyzing the comprehensive corrosion resistance comprises the following steps: the first step, the corrosion resistance degree coefficient of the surface of the round tube under each concentration of corrosion reagent is respectively readCoefficient of chemical resistance to corrosionSubstituting it into formulaObtaining the comprehensive corrosion resistance degree index of the round tubeWhereinIndicating the amount of the corrosive agent in concentration,the weight factors respectively represent the corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the surface.
Secondly, comparing the comprehensive corrosion resistance index of the circular tube with preset corrosion resistance index thresholds of all levels, screening to obtain the comprehensive corrosion resistance level of the circular tube, and feeding back; the comprehensive corrosion resistance of the round pipe is graded by comparing the comprehensive corrosion resistance index of the round pipe with preset corrosion resistance index thresholds of all levels, and the corrosion resistance of a plurality of different levels can be graded by setting different thresholds, so that the corrosion resistance of the round pipe under different corrosion reagent concentrations can be evaluated.
It should be noted that the comprehensive corrosion resistance level of the round tube comprises a first-stage corrosion resistance, a second-stage corrosion resistance, a third-stage corrosion resistance and a fourth-stage corrosion resistance, and the first-stage corrosion resistance is greater than the second-stage corrosion resistance and greater than the third-stage corrosion resistance and greater than the fourth-stage corrosion resistance, and meanwhile the fourth-stage corrosion resistance is not qualified, the third-stage corrosion resistance is qualified, the second-stage corrosion resistance is good, and the first-stage corrosion resistance is excellent.
According to the invention, the surface corrosion resistance degree coefficient of the circular tube is obtained by analyzing the surface parameters of the circular tube sample, the chemical corrosion resistance degree coefficient of the circular tube is obtained by analyzing the corrosion resistance parameters of the circular tube sample, the comprehensive corrosion resistance degree index of the circular tube is obtained, and the comprehensive corrosion resistance degree index is compared with preset corrosion resistance degree index thresholds of all levels to obtain the comprehensive corrosion resistance performance grade of the circular tube, so that the corrosion resistance of the circular tube can be accurately evaluated, the quality control of the circular tube is improved, and the design and use are optimized, thereby ensuring the reliability and durability of the circular tube in a corrosion environment.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention, which is also intended to be covered by the present invention.
Claims (8)
1. A quick test analysis method for corrosion resistance of a circular pipe is characterized by comprising the following steps:
s1, detecting circular tube sample data: sampling a circular pipe to be detected, and detecting the material type of the circular pipe;
s2, matching the type of the corrosive reagent: matching corresponding corrosion reagents for the circular tube samples according to the material types of the circular tube pipelines;
s3, detecting surface corrosion parameters: detecting surface corrosion parameters of the circular tube sample under each concentration of corrosion reagent at each time point, wherein the surface corrosion parameters comprise a surface chromaticity value, corrosion quality and corrosion trace area;
s4, surface corrosion resistance analysis: according to the analysis of the surface corrosion parameters of the circular tube sample under each concentration of the corrosion reagent at each time point, the comprehensive corrosion rate and the corrosion degree of the circular tube sample under each concentration of the corrosion reagent are obtained, and further the surface corrosion resistance degree coefficient of the circular tube under each concentration of the corrosion reagent is obtained through analysis；
S5, detecting chemical corrosion parameters: detecting chemical corrosion parameters of the circular tube sample under each concentration of corrosion reagent, wherein the chemical corrosion parameters comprise corrosion current density in each set potential range and content of each element component in corrosion products;
s6, chemical corrosion resistance analysis: obtaining the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosive agent according to the chemical corrosion parameter analysis of the round tube sample under each concentration of corrosive agent；
S7, analysis of comprehensive corrosion resistance: and analyzing the surface corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagent to obtain a comprehensive corrosion resistance degree index of the round tube, and comparing the comprehensive corrosion resistance degree index with preset corrosion resistance degree index thresholds of all levels to obtain the comprehensive corrosion resistance performance grade of the round tube.
2. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 1, which is characterized in that: the specific analysis method of the type of the matched corrosive agent comprises the following steps:
firstly, acquiring the material type of a circular tube pipeline to be detected through a magnetic detection instrument, sampling the circular tube pipeline according to a set volume, and recording the sample as each circular tube sample;
and reading the material types of the circular pipes corresponding to the corrosion reagents from the management database, matching the material types of the circular pipes with the material types of the circular pipes corresponding to the corrosion reagents, obtaining corrosion reagents corresponding to the material types of the circular pipes, marking the corrosion reagents as circular pipe sample corrosion reagents, respectively preparing corrosion reagents with different concentrations for the circular pipe samples according to set concentration differences, and placing the circular pipe samples in the corrosion reagents with the concentrations after the circular pipe samples are in one-to-one correspondence with the corrosion reagents with the concentrations, and marking the corrosion reagents as circular pipe samples with the concentrations.
3. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 1, which is characterized in that: the specific analysis process of the surface corrosion parameter detection is as follows:
the first step, a plurality of time points are taken from the test duration of the circular tube sample according to the set duration, the circular tube sample at each time point under each concentration of corrosive reagent is respectively subjected to image acquisition, the circular tube sample image at each time point under each concentration of corrosive reagent is marked, the chromaticity of each pixel point in the circular tube sample image at each time point under each concentration of corrosive reagent is respectively detected, and the circular tube sample image at each time point under each concentration of corrosive reagent is marked asWherein->Indicate->Number of corrosive agents of individual concentrations, +.>，/>Indicate->Number of time points,/->，/>Indicate->Number of individual pixels>Substituting it into formulaObtaining the round tube sample under each concentration of corrosive agentSurface colorimetric values for the respective time points +.>；
The second step, weigh the initial round tube sample, record as the round tube sample massAnd weighing round tube samples at each time point under each concentration of corrosive agent after the start of the test, and marking as +.>By the formula->Obtaining the corrosion quality of the round tube sample at each time point under each concentration of the corrosion reagent>；
Reading the circular tube sample image of each time point under each concentration corrosive reagent, converting the circular tube sample image into a gray level image, detecting the gray level value of each pixel point, comparing the gray level value of each pixel point in the circular tube sample image of each time point under each concentration corrosive reagent with a set gray level threshold value, marking the pixel point which is larger than or equal to the set gray level threshold value as the circular tube sample image corrosive pixel point of each time point under each concentration corrosive reagent, counting each corrosive pixel point of the circular tube sample image of each time point under each concentration corrosive reagent, marking the area enclosed by the corrosive pixel point as the circular tube sample image corrosive trace area of each time point under each concentration corrosive reagent, calculating the area of the circular tube sample and marking the area as the corrosive trace area of the circular tube sample under each concentration corrosive reagent at each time point。
4. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 3, wherein the method comprises the following steps: the specific analysis process of the comprehensive corrosion rate of the circular tube sample under each concentration of the corrosion reagent comprises the following steps:
firstly, reading the surface chromaticity value of a circular tube sample at each time point under each concentration of corrosive reagentSimultaneously extracting the time length between the time points, which is recorded as +.>Substituting it into the formula +.>Obtaining the change rate of the color value of the surface of the circular tube sample under each concentration of corrosive agent>，/>Indicates the number of time points, +.>Indicate->Concentration of corrosive agent->Surface chromaticity values of the circular tube samples at each time point;
step two, the corrosion quality of the circular tube sample at each time point under each concentration of corrosion reagent is readCorrosion trace area of round tube sample at each time point under each concentration of corrosive agent +.>According to analysis of each concentration corrosion testThe method for measuring the change rate of the chromaticity value of the surface of the circular tube sample under the agent is used for obtaining the change rate of the corrosion quality of the circular tube sample under each concentration of corrosion reagent and the change rate of the corrosion trace area of the circular tube sample under each concentration of corrosion reagent by the same analysis, which are marked as +.>And->；
Third, analyzing the comprehensive corrosion rate of the circular tube sample under each concentration of corrosive reagentThe formula is as follows:wherein->Weight factors respectively representing the set change rate of the surface chromaticity value, the change rate of the corrosion quality and the change rate of the corrosion trace area, and。
5. the method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 4, which is characterized in that: the specific analysis process of the surface corrosion resistance analysis is as follows:
the first step, the surface chromaticity value of the round tube sample at each time point under each concentration of corrosive agent is respectively readCorrosion quality of round tube sample>Corrosion trace area of round tube sample->By the formulaObtaining the corrosion degree of the round tube sample under each concentration of corrosive reagent>Wherein->Decibels represent the reference values of the surface chromaticity value, the corrosion quality and the corrosion trace area of the set round tube sample, +.>Weight factors respectively representing the surface chromaticity value, corrosion quality and corrosion trace area of the circular tube sample, and +.>，/>Representing the number of time points;
step two, reading the comprehensive corrosion rate of the circular tube sample under each concentration of corrosion reagentSubstituting it into formulaObtaining the surface corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagentWherein->Reference values respectively representing the set integrated corrosion rate, corrosion degree, +.>Weight factors respectively representing comprehensive corrosion rate and corrosion degree of circular tube sample>Representing natural constants.
6. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 1, which is characterized in that: the specific analysis process of the chemical corrosion parameter detection is as follows:
the first step, after the set test time is over, dividing the potential range according to the set potential, applying voltage to the round tube sample under each concentration of corrosive agent in each set potential range, measuring the corresponding response current value of the round tube sample under each concentration of corrosive agent in each set potential range, and recording asWherein->Indicate->The number of the potential range is set,simultaneously reading the cross-sectional area of the round tube sample>By the formula->Obtaining corrosion current density in each set potential range of the round tube sample under each concentration of corrosion reagent>；
The second step, quantitatively collecting corrosion products of the circular tube samples under the corrosive agents of all concentrations, putting the corrosion products into an energy spectrometer, recording the corrosion products as corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, generating X-rays by exciting the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, collecting X-ray energy spectrum data, recording the X-ray energy spectrum data as energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, simultaneously extracting standard energy spectrum data from a management database, comparing the standard energy spectrum data with the energy spectrum data of the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations to obtain element components and element component contents in the corrosion product samples of the circular tube samples under the corrosive agents of all concentrations, recording the element component contents in the corrosion product samples of the circular tube samples of all concentrations asWherein->Indicate->Numbering of individual element components->。
7. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 6, which is characterized in that: the specific analysis method for analyzing the chemical corrosion resistance comprises the following steps:
reading corrosion current density in each set potential range of circular tube sample under each concentration of corrosion reagentAnd the content of each element component in the corrosion product of the round tube sample under each concentration of the corrosion reagent +.>Analyzing the chemical corrosion resistance degree coefficient of the round tube under each concentration of corrosion reagent>The formula is as follows: />Wherein->Indicate the set->Concentration of->Reference value of response current value of circular tube sample in individual potential range, +.>Indicate the set firstCircular tube sample corrosion product +.>Reference value of the content of the individual element components +.>Respectively representing the set response current value of the circular tube sample and the weight factors of the element content of the corrosion product of the circular tube sample.
8. The method for rapidly testing and analyzing the corrosion resistance of the circular pipe according to claim 1, which is characterized in that: the specific analysis method for analyzing the comprehensive corrosion resistance comprises the following steps:
the first step, the corrosion resistance degree coefficient of the surface of the round tube under each concentration of corrosion reagent is respectively readCoefficient of chemical resistance to corrosion->Substituting it into the formula +.>Obtaining the comprehensive corrosion resistance degree index of the round tubeWherein->Indicating the amount of corrosive agent in concentration, +.>Weight factors respectively representing the corrosion resistance degree coefficient and the chemical corrosion resistance degree coefficient of the surface;
and secondly, comparing the comprehensive corrosion resistance index of the circular tube with preset corrosion resistance index thresholds of all levels, screening to obtain the comprehensive corrosion resistance level of the circular tube, and feeding back.
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| CN109799254A (en) * | 2019-01-18 | 2019-05-24 | 中国石油天然气集团公司 | A kind of band water transport battalion tunnel pipelines connect steel member service life prediction technique |
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