CN103091242A - System for automatic test on cathode disbonding resistance of anticorrosive coating of steel pipe - Google Patents
System for automatic test on cathode disbonding resistance of anticorrosive coating of steel pipe Download PDFInfo
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Abstract
The invention discloses a system for an automatic test on cathode disbonding resistance of an anticorrosive coating of a steel pipe. The invention relates to the technical field of general corrosion protection and pipe systems. The system comprises a special-purpose voltage data collection card, a current data collection card, a PCI bus, a host computer, a variable resistance box, voltage/current data acquisition probes, a direct-current power supply, a baking oven, test tanks, an electrolyte and electrodes. The electrolyte is poured into the test tanks in a temperature controllable system by being controlled by a valve. The platinum electrode, the calomel electrode and the current data acquisition probe are inserted into the electrolyte. A test piece is arranged on the bottom of the test tank. The platinum electrode passes through a variable resistance and then is connected to the anode of the direct-current power supply. The cathode of the direct-current power supply is connected to the test piece. The special-purpose voltage data collection card and the current data collection card are connected to the host computer of an analysis control system by the PCI bus. The voltage data acquisition probe is connected to the end of the calomel electrode. The system provided by the invention has functions of control, acquisition and storage and can efficiently, accurately and objectively produce test data.
Description
Technical field
The present invention is a kind of steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system.The general corrosion protection and the piping system technical field that relate to metal material.
Background technology
Along with the continuous lifting of national economy, domestic every profession and trade is also growing with each passing day to the demand of oil, rock gas.Country has not only carried out large-scale input to the exploration of domestic oil, natural gas source, and actively cooperates with external surrounding countries, buys a large amount of crude oil and rock gas and satisfies domestic demand.Under such environment, also entered a new developing period, the domestic pipe-line construction task of having completed nearly 100,000 kms during 11th Five-Year as its construction of pipeline of conveying crude oil, rock gas Main Means.So development makes people more pay close attention to the anticorrosive quality of pipeline fast.In recent years, generally adopt advanced three-decker tygon (3PE) coating technology in most of pipework of China, obtained good effect.The 3PE coating has overcome the deficiency of single epoxy coating and polyethylene anticorrosive coating, has good combination property.But in recent years in-service pipeline is excavated when detecting, finds many pipe body corrosion phenomenons that lost efficacy and cause due to anticorrosive coat, some pipelines have just reached 3-4mm in the corrosion depth of 3-4 interior tube body, and annual is corroded and reached 1mm.So corrosion has not only affected quality and the serviceable life of pipeline fast, and has stayed huge potential safety hazard to normal operation.So the effect of anti-corrosion material in the pipeline corrosion protection engineering is particularly important.In the anti-corrosion material Performance Detection that carry out in the laboratory, the cathodic disbonding performance is one of important performance of pipeline corrosion protection layer material, and its quality is directly connected to the combined effect of coating and cathodic protection.
At present, the cathodic disbonding technical standard of domestic use mainly contains two kinds, the basic skills of a kind of SY/T of being 0413 " buried steel pipeline polyethylene anticorrosive coating technical standard " appendix B regulation is carried out, and the basic skills of a kind of SY/T of being 0315-2005 " steel pipe clinkery epoxy powder external coating technical standard " appendix C regulation is carried out.Test is carried out in thermostatic drying chamber, and auxiliary electrode is 213 type platinum electrodes, and contrast electrode is saturated calomel electrode (seeing Fig. 1).Investigate different factors to the impact of 3PE coated cathode stripping performance by changing several Mains.Need continuous regulating resistor to come warranty test voltage in test process, and after finishing, test period needs to prize artificially the stripping coating until till anticorrosive coat shows obvious anti-sled stripping property, like this, not only reduced testing efficiency, also make test data not accurate enough, can not reflect objectively the antikathode stripping performance of coating.In order to make the cathodic disbonding test figure more accurate, test operation is more convenient, should develop a kind of cathodic disbonding test data collection system that is specifically applied to pipeline coatings.
Summary of the invention
The objective of the invention is to invent a kind of major functions such as control, collection, storage that have, can reflect more efficiently, accurately, objectively the steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system of test data.
Because cathodic disbonding and electric current, temperature variation have certain relation, therefore can set up by experiment the relation between electric current, temperature variation and cathodic disbonding variation, by monitoring current, temperature variation, can obtain cathodic disbonding numerical value.The present invention is based on automatic data collection and analytical technology, to carrying out Real-Time Monitoring by electrolytic solution and test specimen cathodic disbonding experiment.Arrange by control system being carried out the sampling period, data collecting card is acquisition test temperature, electric current, the isoparametric numerical value of voltage incessantly, by analyzing the variation of these parameters, draw the numerical value of cathodic disbonding intensity, thereby estimate the coating antiseptic quality more simply objectively.
The present invention is based on automatic data collection and analytical technology, carry out Real-Time Monitoring to detecting by electrolytic solution and test specimen cathodic disbonding.Arrange by control system being carried out the sampling period, data collecting card is acquisition test temperature, electric current, the isoparametric numerical value of voltage incessantly, by analyzing the variation of these parameters, can draw the numerical value of cathodic disbonding intensity, estimate more objectively the coating antiseptic quality simultaneously.
Cathodic disbonding Auto-Test System of the present invention is overall to be consisted of as shown in Figure 1, comprises specialized voltages data collecting card, current data capture card, pci bus, host computer, variable resistance box, voltage/current data collecting probe, direct supply, controllable temperature system, test trough, electrolytic solution and electrode; Be placed in to be controlled by valve in a plurality of test trough of controllable temperature system and inject electrolytic solution, insert platinum electrode, mercurous chloride electrode and current acquisition end in electrolytic solution, test specimen is placed under test trough; Platinum electrode is connected with the positive pole of direct supply after by variable resistor, and negative pole and the test specimen of current source join; Specialized voltages data collecting card, current data capture card are connected with analysis and Control system-host computer by pci bus, and the voltage acquisition probe is through being connected with the mercurous chloride electrode end, and the current acquisition probe stretches into and carries out Real-time Collection in electrolytic solution.
Variable resistor automatically adjusts by control module, maintains-1.5V to guarantee the test specimen both end voltage.Insert an other electrode in electrolytic solution and be used for electrolytic solution current data in the Real-time Collection test process, and the real-time storage data are convenient to estimate after test finishes.
Wherein:
Electrolytic solution in test trough is controlled temperature by baking oven;
Be connected prefabricated plastic cylinder and test specimen are concentric with fluid sealant, and to add concentration in test trough be 3% NaCl electrolytic solution, liquid level sensor is positioned over test trough 4/5 place, and during lower than this position, system can add distilled water to keep liquid level automatically when liquid level;
Current data capture card and voltage data capture card have a plurality of data acquisition channels, can test simultaneously many groups test specimen simultaneously;
Database and data processing software that host computer exploitation is special-purpose carry out objective, science, effectively evaluating to test data.
Fig. 2 is observing and controlling and the acquisition system circuit diagram of this test macro, and this test macro adopts NI voltage acquisition card PCI6221 and current acquisition card PCI6239.PCI6221 is 16, sampling rate 250kS/s, the high speed voltage data collecting card with 10 passages.PCI6221 is 16, sampling rate 250kS/s, the High-speed Electric flow data capture card with 8 passages.The a-road-through road of current acquisition end and platinum electrode access PCI6221, the voltage during to test keeps gathering at any time.During due to test, the resistivity of solution changes, and makes both end voltage not stablize, so according to the magnitude of voltage of PCI6221 collection, variohm is regulated in real time, stabilizes to-1.5V to guarantee test voltage.Insert the a-road-through road that mercurous chloride electrode and current acquisition termination enter PCI6239 in the electrolytic solution of test trough, electric current in electrolytic solution is carried out Real-time Collection, be stored into disk system after being processed by computing machine by the PCI port.
Cathodic disbonding Auto-Test System of the present invention, have the major functions such as control, collection, storage, analysis, the functions such as the support of upper computer software fulfillment database, data analysis and slave computer control, the cathodic disbonding automatic data acquisition system (ADAS) can reflect experimental data more efficiently, accurately, objectively, and whether effectively evaluation test coating antikathode stripping performance means are provided.
The invention provides a kind of automatic data acquisition system (ADAS) for pipeline coatings cathodic disbonding test.This acquisition system has solved laboratory for a long time and has carried out the problems such as the data that the cathodic disbonding test brings by human factor are inaccurate, efficient is lower, and the test specimen after can finishing the test specimen in test and test carry out more effectively, estimate objectively.The cathodic disbonding test that has solved domestic pipeline anticorrosion coating testing agency is mainly manually-operated, reduces tester's labour intensity, increases work efficiency.Automatic technology is applied to realize automatic real time on-line monitoring, and cost be lower in the cathodic disbonding test.This test macro has automatically, continuously, characteristics timely, the state in the time of can accurately and timely grasping the cathodic disbonding test, data accuracy, repdocutbility are high, for test result provides science more, objective and accurate foundation.
So advantage of the present invention is:
1) the cathodic disbonding test that has solved domestic pipeline anticorrosion coating testing agency is mainly manually-operated, reduces testing crew labour intensity, increases work efficiency;
2) automatic technology is applied to realize automatic real time on-line monitoring, and cost is lower in the cathodic disbonding test;
3) this test macro have automatically, continuously, characteristics timely, the state in the time of can accurately and timely grasping the cathodic disbonding test, data accuracy, repdocutbility are high, for test result provides science more, objective and accurate foundation.
Description of drawings
The automatic collecting test system principle diagram of the anti-cathodic disbonding performance data of Fig. 1 steel pipeline anti-corrision layer
Fig. 2 test macro electrical schematic diagram
Embodiment
Embodiment. also the present invention is further illustrated with this example, the specific embodiment of the present invention to be described.This example is an experimental prototype, and it consists of as shown in Figure 1, comprises specialized voltages, current data capture card, pci bus, host computer (common PC), variable resistance box, voltage/current data collecting probe, direct supply.Specialized voltages, current data capture card are connected with host computer by pci bus, and the voltage/current data collecting probe is connected with auxiliary electrode and inserts solution by variable resistance box, and the test specimen that is placed in baking oven is connected with the negative pole of direct supply.
Variable resistor automatically adjusts by control module, maintains-1.5V to guarantee the test specimen both end voltage.Insert an other probe in electrolytic solution and be used for electrolytic solution current data in the Real-time Collection test process, and the real-time storage data are convenient to estimate after test finishes.
This test macro (seeing Fig. 2) adopts NI voltage acquisition card PCI6221 and current acquisition card PCI6239.PCI6221 is 16, sampling rate 250kS/s, the high speed voltage data collecting card with 10 passages.PCI6221 is 16, sampling rate 250kS/s, the High-speed Electric flow data capture card with 8 passages.By being connected with the electrode at experimental tank two ends after variohm, the adjustment rheostat makes the electrode both end voltage remain on-1.5V by the voltage of voltage source output.13 pin of PCI6221 meet the current acquisition end PF10/P1.0 of test trough P1,15 pin meet the current acquisition end PF13/P1.3 of test trough P2,17 pin meet the current acquisition end PF16/P1.6 of test trough P3,32 pin meet the current acquisition end PF11/P1.1 of test trough P4, and 33 pin meet the current acquisition end PF12/P1.2 of test trough P5; The DGND14 of PCI6221, DGND16, DGND18 connect the platinum electrode of P1-P5; 32 pin of PCI6239 meet the mercurous chloride electrode PF11/P0.1 (input) of test trough P1,33 pin meet the mercurous chloride electrode PF12/P0.2 (input) of test trough P2,34 pin meet the mercurous chloride electrode PF14/P0.4 (input) of test trough P3,13 pin meet the mercurous chloride electrode PF10/P0.0 (input) of test trough P4, and 15 pin meet the mercurous chloride electrode PF13/P0.03 (input) of test trough P5.By the voltage of voltage source output by being connected with the electrode at test trough two ends after variohm, be that voltage source output meets the PF10/P1.0 that meets again P1 after variohm R1, meet the PF13/P1.3 that meets again P2 after variohm R2, meet the PF14/P0.4 (input) that meets again P3 after variohm R3, meet the PF11/P1.1 that meets again P4 after variohm R4, meet the PF12/P1.2 that meets again P5 after variohm R5, adjust rheostat and make the electrode both end voltage remain on-1.5V.The a-road-through road of electrode two ends access PCI6221, the voltage during to test keeps gathering at any time.During due to test, the resistivity of solution changes, and makes both end voltage not stablize, so according to the magnitude of voltage of PCI6221 collection, variohm is regulated in real time, stabilizes to-1.5V to guarantee test voltage.Insert the a-road-through road of PCI6239 in the electrolytic solution of test trough, electric current in electrolytic solution is carried out Real-time Collection, be stored into disk system after being processed by computing machine by the PCI port.
Wherein current acquisition card and voltage acquisition card have 24 data acquisition channels, can test simultaneously 24 groups of test specimens simultaneously;
Database and data processing software that host computer exploitation is special-purpose carry out objective, science, effectively evaluating to test data.
Wherein current acquisition card and voltage acquisition card have 24 data acquisition channels, can test simultaneously 24 groups of test specimens simultaneously;
Database and data processing software that host computer exploitation is special-purpose carry out objective, science, effectively evaluating to test data.
Wherein:
The voltage acquisition card is chosen the NI PCI6221 of company, and its characteristics are as follows:
2 tunnel 16 simulation outputs (833kS/s);
24 railway digital I/O lines; 32 digit counters;
Can trace to the source to the calibration certificate of NIST, and more than 70 signal condition option;
Related (Correlated) DIO (8 clock lines, 1MHz;
The NI-MCal collimation technique has improved measuring accuracy;
Separately there is the high speed M high precision M series serial and 4 resolutions of 5 sampling speed available;
NI-DAQmx drive software and NI LabVIEW SignalExpress LE interactive data logging software;
Annex: terminal box-bolt terminal SCB-68-776844-01; Cable-shielding SHC68-68-EPM Cable (2m)-192061-02;
The current acquisition card is chosen the NI PCI6239 of company, and its characteristics are as follows:
Unremitting group of isolation of 60VDC can be born the Isosorbide-5-Nitrae 00Vrms/1 of 5s, and the 950VDC passage is isolated between bus;
2 tunnel simulation outputs (0mA is to 20mA), 16 bit resolutions, sampling rate 500kS/s;
6 railway digital inputs and the output of 4 railway digitals, the 24V source voltage;
2 counter/timers, 32 bit resolutions, 80MHz; Numeral triggers;
The NI-MCal collimation technique has improved measuring accuracy;
NI-DAQmx drive software and NI LabVIEW SignalExpress interactive data logging software;
Annex: terminal box-bolt terminal CB-37F-HVD-779491-01; Cable-shielding SH37F-37M Cable (1m)-778621-01.
This example can accurately and timely be grasped the cathodic disbonding state in when test through test, and data accuracy, repdocutbility are high, realized automatic real time on-line monitoring, and cost are lower.
Claims (4)
1. a steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system, is characterized in that it comprises specialized voltages data collecting card, current data capture card, pci bus, host computer, variable resistance box, voltage/current data collecting probe, direct supply, baking oven, test trough, electrolytic solution and electrode; Be placed in to be controlled by valve in a plurality of test trough of controllable temperature system and inject electrolytic solution, insert platinum electrode, mercurous chloride electrode and current acquisition end in electrolytic solution, test specimen is placed under test trough; Platinum electrode is connected with the positive pole of direct supply after by variable resistor, and negative pole and the test specimen of current source join; Specialized voltages data collecting card, current data capture card are connected with analysis and Control system-host computer by pci bus, and the voltage acquisition probe is connected with the mercurous chloride electrode end;
Variable resistor automatically adjusts by control module, and the test specimen both end voltage is maintained-1.5V; Insert an other probe in electrolytic solution and be used for electrolytic solution current data in the Real-time Collection test process, and the real-time storage data are convenient to estimate after test finishes.
2. steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system according to claim 1, it is characterized in that being connected prefabricated plastic cylinder and test specimen are concentric with fluid sealant, and to add concentration in test trough be 3% NaCl electrolytic solution, and liquid level sensor is positioned over test trough 4/5 place.
3. steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system according to claim 1, is characterized in that described current data capture card and voltage data capture card have a plurality of data acquisition channels.
4. steel pipeline anticorrosive coating cathodic disbonding resistance automatic testing system according to claim 1, is characterized in that this test macro adopts NI voltage acquisition card PCI6221 and current acquisition card PCI6239; PCI6221 is 16, sampling rate 250kS/s, the high speed voltage data collecting card with 10 passages; PCI6221 is 16, sampling rate 250kS/s, the High-speed Electric flow data capture card with 8 passages; The a-road-through road of current acquisition end and platinum electrode access PCI6221 keeps gathering at any time and guaranteeing that test voltage stabilizes to-1.5V to voltage; Insert the a-road-through road that mercurous chloride electrode and current acquisition termination enter PCI6239 in the electrolytic solution of test trough, electric current in electrolytic solution is carried out Real-time Collection, be stored into disk system after being processed by computing machine by the PCI port.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2533344C1 (en) * | 2013-07-09 | 2014-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенский государственный университет" (ФГБОУ ВПО "Пензенский государственный университет") | Installation for electrochemical survey of metal corrosion |
| CN108931474A (en) * | 2017-05-26 | 2018-12-04 | 中国石油天然气集团公司 | A kind of Prediction Method of Coating Film Life |
| CN110857873A (en) * | 2018-08-23 | 2020-03-03 | 中国石油天然气股份有限公司 | Natural gas flow detects uses anticorrosive device and natural gas flow detecting system |
| CN113340802A (en) * | 2020-03-02 | 2021-09-03 | 广州特种承压设备检测研究院 | Integrated cathode stripping test device |
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| RU2533344C1 (en) * | 2013-07-09 | 2014-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенский государственный университет" (ФГБОУ ВПО "Пензенский государственный университет") | Installation for electrochemical survey of metal corrosion |
| CN108931474A (en) * | 2017-05-26 | 2018-12-04 | 中国石油天然气集团公司 | A kind of Prediction Method of Coating Film Life |
| CN108931474B (en) * | 2017-05-26 | 2021-03-09 | 中国石油天然气集团公司 | Coating life prediction method |
| CN110857873A (en) * | 2018-08-23 | 2020-03-03 | 中国石油天然气股份有限公司 | Natural gas flow detects uses anticorrosive device and natural gas flow detecting system |
| CN113340802A (en) * | 2020-03-02 | 2021-09-03 | 广州特种承压设备检测研究院 | Integrated cathode stripping test device |
| CN113340802B (en) * | 2020-03-02 | 2022-12-27 | 广州特种承压设备检测研究院 | Integrated cathode stripping test device |
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Effective date of registration: 20211109 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
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