CN106442306A - Device and method capable of realizing electrochemical corrosion test under different dissolved oxygen content conditions - Google Patents
Device and method capable of realizing electrochemical corrosion test under different dissolved oxygen content conditions Download PDFInfo
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- CN106442306A CN106442306A CN201610907417.5A CN201610907417A CN106442306A CN 106442306 A CN106442306 A CN 106442306A CN 201610907417 A CN201610907417 A CN 201610907417A CN 106442306 A CN106442306 A CN 106442306A
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a device and a method capable of realizing electrochemical corrosion test under different dissolved oxygen content conditions. The device comprises an electrochemical workstation, a beaker, a nitrogen cylinder, an oxygen cylinder, an oxygen glass rotor flow meter, a nitrogen glass rotor flow meter, a gas outlet plate, a dissolved oxygen measuring instrument and a digital signal controller. The oxygen cylinder and the nitrogen cylinder provide oxygen and nitrogen for a test solution, so that the purpose of increasing or reducing the content of dissolved oxygen is achieved. The dissolved oxygen measuring instrument is used for measuring the content of the dissolved oxygen in the test solution in the beaker in real time and transmitting a monitoring signal to the digital signal controller; the signal controller is used for adjusting the glass rotor flow meter through the rotation of the valve controller and further controlling the flow rate of the oxygen and the nitrogen into the test solution. The gas outlet plate is used for uniformizing the effluent oxygen and nitrogen. According to the device and the method provided by the invention, the content of the dissolved oxygen in the test solution is enabled to be accurately, stably and automatically controlled, and a precondition is provided for the use of an electrochemical method to measure the effect of the dissolved oxygen on metal corrosion.
Description
Technical field
The present invention relates to a kind of corrosion tester, more particularly, to a kind of electricity enabling under the conditions of different dissolved oxygen content
Chemical attack test device and method.
Background technology
At present, the known corrosion tester being related to dissolved oxygen content is made up of nitrogen cylinder and beaker.By nitrogen cylinder
It is only capable of removing intrinsic dissolved oxygen in testing liquid, the therefore dissolved oxygen content in solution is limited by solution initial dissolution oxygen content
System, measurement range is limited.And only passing through the outlet valve adjusting gas flow on nitrogen cylinder, outlet pressure is difficult to control to, and leads
Cause to be likely to occur larger bubble in testing liquid, when serious, lead to solution to be splashed to outside beaker.Nitrogen flows out from single pipeline, gas
Bubble rises to beaker surface process from bottom of the beaker, and the nitrogen amount being absorbed by solution is limited, causes to waste.Cannot in process of the test
Dissolved oxygen content in Control experiment solution, on stability number, affects the accuracy of result of the test in real time.
Content of the invention
In order to overcome electrochemical corrosion method of testing under the conditions of existing different dissolved oxygen content and that device exists is molten
The deficiency that solution oxygen content scope is little, gas flow is difficult to control to the aspect such as unstable with bubble, the present invention provides one kind to enable
The electrochemical corrosion test device of different dissolved oxygen content condition, this device can not only widen controlled dissolved oxygen content scope, and
And gas flow can be automatically adjusted, and so that bubble is flowed out in outlet fine uniform, reliable and stable electrochemical test ring is provided
Border.
Another object of the present invention is to providing a kind of electrochemical corrosion test enabling different dissolved oxygen content condition
Method.
The technical solution adopted for the present invention to solve the technical problems is：
Including electrochemical workstation, beaker, nitrogen cylinder, oxygen cylinder, oxygen glass rotameter, nitrogen glass rotors flow
Meter, gas vent disk, dissolved oxygen sensing instrument and digital signal controller, oxygen cylinder, oxygen glass rotameter, gas vent
Disk is sequentially communicated；Nitrogen cylinder, nitrogen glass rotameter, gas vent disk are sequentially communicated；Testing liquid, gas is contained in beaker
Body outlet disk is placed in beaker bottom, and beaker mouth passes through beaker cover seal；Electrochemical workstation and working electrode, reference electrode and auxiliary
Electrode is helped to be connected, working electrode, reference electrode and auxiliary electrode stretch in testing liquid in beaker；The one of dissolved oxygen sensing instrument
End connects probe, and probe extend into inside testing liquid, and the other end of dissolved oxygen sensing instrument connects digital signal controller, numeral
Signal controller is connected with valve positioner, and valve positioner controls oxygen glass rotameter and nitrogen glass rotors flow
The flow of meter.
Described gas vent disk profile is discoid, and gas vent disk diameter is less than beaker internal diameter, and gas vent disk divides
Two mutually isolated sheaf spaces up and down, upper strata is connected with oxygen intake, and has multiple outlets being smaller in size than entrance；Lower floor and nitrogen
Gas entrance connects, and is excluded nitrogen in outlet disk upper surface by some tiny vertical tubes.
The described gas vent face of trying to get to the heart of a matter is provided with sucker, and sucker suction is in beaker bottom.
Described beaker cover is drilled with multiple holes, and beaker cover passes through silica gel sealing hole edge.
Described digital signal controller is the microcomputer with programmable functions.
The method of testing of the present invention comprises the steps：
Dissolved oxygen content numerical value needed for setting test in digital signal controller, opens the valve on oxygen cylinder and nitrogen cylinder；
In process of the test, dissolved oxygen sensing instrument reads the dissolved oxygen content in current test solution, is transferred to numeral letter in electrical signal form
Number controller, if the dissolved oxygen content of measurement is less than preset value, is turned by control valve controller increase oxygen glass
Oxygen flow in subflow gauge, simultaneously closes off nitrogen valve, makes dissolved oxygen in testing liquid rise to test desired concn；If
The dissolved oxygen content of measurement is higher than preset value, then increased in nitrogen glass rotameter by control valve controller
Nitrogen flow, simultaneously closes off oxygen valve, makes dissolved oxygen in testing liquid drop to test desired concn.
Advantages of the present invention effect is as follows：
1st, oxygen flow pipe and nitrogen flow pipe are introduced in beaker, by controlling the relative discharge of oxygen and nitrogen, can be real
Existing change in larger concentration range for the dissolved oxygen content, carries on the research of material corrosion impact for carrying out dissolved oxygen content change
For condition.
2nd, introducing dissolved oxygen sensing instrument probe in beaker, the dissolved oxygen content in energy real-time monitoring testing liquid, and according to
The reading of measuring instrument, by digital signal controller and valve positioner feedback regulation nitrogen and oxygen flow.
3rd, beaker cover is drilled with multiple holes, for connecting three electrodes, gas inlet line and dissolved oxygen sensing instrument wire, and
Internal solution can be made to completely cut off air by silica gel sealing.
4th, nitrogen cylinder, oxygen cylinder are connected with gas vent disk respectively after glass rotameter, by Valve controlling
Device controls glass rotameter valve, enables the stability contorting of gas outflow pressure, flow.
5th, gas vent disk has two entrances, multiple outlets, can divide entrance pipe uniform flow equally, so that gas is being burnt
Cup bottom different parts uniform and delicate ground flows out, and dissolves in testing liquid, reduces the interference to test system.
Brief description
Fig. 1 is the total schematic diagram of the present invention.
Fig. 2 is the top view of beaker cover in the present invention.
Fig. 3 is the operation principle schematic diagram of gas vent disk in the present invention.
Wherein down arrow represents gas access, represents gas vent to upward arrow, and filled arrows represent oxygen, hollow arrow
Head represents nitrogen.
In figure device is configured to：1st, electrochemical workstation；2nd, auxiliary electrode interface；3rd, working electrode interface；4th, reference electricity
Pole interface；5th, dissolved oxygen sensing instrument；6th, pop one's head in；7th, auxiliary electrode；8th, reference electrode；9th, working electrode；10th, gas vent disk；
11st, beaker；12nd, beaker cover；13rd, nitrogen glass rotameter；14th, oxygen glass rotameter；15th, flowmeter support；
16th, nitrogen inlet tube；17th, oxygen inlet tube；18th, nitrogen outlet pipe；19th, oxygen outlet pipe；20th, nitrogen cylinder；21st, oxygen cylinder；
22nd, digital signal controller；23rd, valve positioner；24th, working electrode jack；25th, auxiliary electrode jack；26th, reference electrode is inserted
Hole；27th, dissolved oxygen sensing instrument probe jack；28th, oxygen inlet tube jack；29th, nitrogen inlet tube jack；30th, sucker.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to patent of the present invention.
Embodiment
As shown in figure 1, including electrochemical workstation 1, beaker 11, nitrogen cylinder 20, oxygen cylinder 21, oxygen glass rotors flow
Meter 14, nitrogen glass rotameter 13, gas vent disk 10, dissolved oxygen sensing instrument 5 and digital signal controller 22, oxygen cylinder
21st, oxygen outlet pipe 19, oxygen glass rotameter 14, oxygen inlet tube 17, gas vent disk 10 are sequentially communicated；Nitrogen cylinder
20th, nitrogen outlet pipe 18, nitrogen glass rotameter 13, nitrogen inlet tube 16, gas vent disk 10 are sequentially communicated, oxygen glass
Glass spinner flowmeter 14, nitrogen glass rotameter 13 are fixed on flowmeter support；Testing liquid, gas is contained in beaker 11
Body outlet disk 10 is placed in beaker 11 bottom, and beaker mouth is sealed by beaker cover 12；Electrochemical workstation 1 passes through working electrode respectively
Interface 3, reference electrode interface 4, auxiliary electrode interface 2 are connected with working electrode 9, reference electrode 8 and platinized platinum auxiliary electrode 7,
Working electrode, reference electrode and auxiliary electrode stretch in testing liquid in beaker；One end of dissolved oxygen sensing instrument 5 connects probe 6,
Probe 6 extend into inside testing liquid, and the other end of dissolved oxygen sensing instrument 5 connects digital signal controller 22, data signal control
Device 22 processed is connected with valve positioner 23, and valve positioner controls oxygen glass rotameter and nitrogen glass rotameter
Flow.
Wherein electrochemical workstation 1 is connected with working electrode 9, reference electrode 8 and platinized platinum auxiliary electrode 7, for measuring
Under given voltage or current signal, the electrochemical response parameter of working electrode, thus judge the corrosion behavior rule of sample.Nitrogen
Gas cylinder 20 and oxygen cylinder 21 provide stable gas source for testing liquid, by the Valve control gas supply pressure on gas cylinder
On a relatively small maintenance level.Oxygen glass rotameter 14, nitrogen glass rotameter 13 1 aspect are used
To measure oxygen and nitrogen flow, the regulating valve on the other hand passed through thereon is controlled by valve positioner transmission, real-time regulation gas
Body flow.Probe extend into inside testing liquid dissolved oxygen sensing instrument 5, measures dissolved oxygen in real time by the sensor on probe
Content.Measurement signal analyzed by dissolved oxygen sensing instrument, change after dissolved oxygen content is shown on panel, simultaneously by result of calculation
It is transferred to digital signal controller 22 in electrical signal form.Digital signal controller is the miniature calculating with programmable functions
Machine it is allowed to user pre-enters setting value, and by numeric ratio incoming to setting value and dissolved oxygen controller relatively, then to valve control
Device processed sends instruction, and control valve opens and closes and aperture.For avoiding valve in process of the test to be frequently turned on and off, in numeral letter
It is also provided with the safe level deviation of dissolved oxygen in number controller, relatively steady to ensure that the dissolved oxygen content in solution maintains
Fixed numerically.Gas vent disk 11 is plastic products, and operation principle is as shown in Figure 3.Profile is discoid, and diameter is slightly less than burning
Cup internal diameter, point two mutually isolated up and down sheaf spaces, upper strata is connected with oxygen intake, and has the less outlet of multiple sizes；Under
Layer is connected with nitrogen inlet, is excluded nitrogen in outlet disk upper surface by some tiny vertical tubes.During test, disk passes through following
In beaker bottom, nitrogen or oxygen uniform and delicate ground flow out sucker suction from upper surface, accelerate gas in testing liquid
Course of dissolution.
The process of the test of the present invention is as follows：
As shown in figure 1, being respectively communicated with oxygen cylinder 21 → oxygen glass rotameter 14 → gas vent disk 10 and nitrogen cylinder
20 → nitrogen, 10 two pipelines of glass rotameter 13 → gas vent disk, make nitrogen inlet tube 16, oxygen in connection procedure
Gas inlet tube 17, by the nitrogen inlet tube jack 29 in beaker cover 12, oxygen inlet tube jack 28, checks that path air-tightness is
No good.Electrochemical measurement working electrode 9, reference electrode 8 and platinized platinum auxiliary electrode 7 are passed through working electrode jack on beaker cover
24th, reference electrode reference electrode plug 26, auxiliary electrode jack 25, and adjust three electrode relative positions, then by dissolved oxygen sensing instrument probe
6 pass through beaker cover 12 dissolved oxygen sensing instrument probe jack 27, with the edge of silica gel sealing beaker cover hole.Examination is poured in beaker 11
Test solution, all parts through beaker cover 12 are together put in solution, so that gas vent disk 10 is fallen in beaker bottom, dissolving
Oxygen measuring device probe 6, working electrode 9, reference electrode 8 and platinized platinum auxiliary electrode 7, in the middle part of beaker, cover beaker cover.In numeral
Dissolved oxygen content numerical value needed for setting test in signal controller, opens the valve on oxygen cylinder and nitrogen cylinder.In process of the test
Dissolved oxygen sensing instrument reads the dissolved oxygen content in current test solution, is transferred to digital signal controller in electrical signal form,
If the dissolved oxygen content of measurement is less than preset value, the oxygen in glass rotameter is increased by control valve controller
Throughput, simultaneously closes off nitrogen valve, makes dissolved oxygen in testing liquid rise to test desired concn；If the dissolved oxygen of measurement contains
Amount is higher than preset value, then increase the nitrogen flow in glass rotameter by control valve controller, simultaneously close off
Oxygen valve, makes dissolved oxygen in testing liquid drop to test desired concn.
The present invention is passed through nitrogen and is entered the dissolved oxygen content in the pilot flow control solution of testing liquid with oxygen.Can root
Require according to corrosion test, set dissolved oxygen content in advance in digital signal controller.By dissolved oxygen sensing instrument, data signal control
In device processed and valve positioner joint feedback control beaker, dissolved oxygen content is equal to and presets numerical value.Gas vent disk can make
Nitrogen is flowed out with oxygen uniform and delicate ground.
Above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to the embodiment of the present invention and is retouched
The technical scheme stated.It will be understood by those within the art that, still the present invention can be modified or equivalent,
To reach identical technique effect.As long as meeting and using needs, all within the scope of the present invention.
Claims (6)
1. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content is it is characterised in that include electrochemistry
Work station, beaker, nitrogen cylinder, oxygen cylinder, oxygen glass rotameter, nitrogen glass rotameter, gas vent disk, molten
Solution oxygen measuring device and digital signal controller, oxygen cylinder, oxygen glass rotameter, gas vent disk are sequentially communicated；Nitrogen
Bottle, nitrogen glass rotameter, gas vent disk are sequentially communicated；Testing liquid is contained, gas vent disk is placed in burning in beaker
Cup bottom, beaker mouth passes through beaker cover seal；Electrochemical workstation is connected with working electrode, reference electrode and auxiliary electrode,
Working electrode, reference electrode and auxiliary electrode stretch in testing liquid in beaker；One end of dissolved oxygen sensing instrument connects probe, visits
Head extend into inside testing liquid, and the other end of dissolved oxygen sensing instrument connects digital signal controller, digital signal controller with
Valve positioner is connected, and valve positioner controls the flow of oxygen glass rotameter and nitrogen glass rotameter.
2. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content according to claim 1,
It is characterized in that described gas vent disk profile is discoid, gas vent disk diameter is less than beaker internal diameter, gas vent disk
Divide two mutually isolated up and down sheaf spaces, upper strata is connected with oxygen intake, and has multiple outlets being smaller in size than entrance；Lower floor with
Nitrogen inlet connects, and is excluded nitrogen in outlet disk upper surface by some tiny vertical tubes.
3. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content according to claim 1,
It is characterized in that the described gas vent face of trying to get to the heart of a matter is provided with sucker, sucker suction is in beaker bottom.
4. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content according to claim 1,
It is characterized in that described beaker cover is drilled with multiple holes, beaker cover passes through silica gel sealing hole edge.
5. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content according to claim 1,
It is characterized in that described digital signal controller is the microcomputer with programmable functions.
6. a kind of electrochemical corrosion test device enabling under the conditions of different dissolved oxygen content according to claim 1
Method of testing is it is characterised in that comprise the steps：
Dissolved oxygen content numerical value needed for setting test in digital signal controller, opens the valve on oxygen cylinder and nitrogen cylinder；
In process of the test, dissolved oxygen sensing instrument reads the dissolved oxygen content in current test solution, is transferred to numeral letter in electrical signal form
Number controller, if the dissolved oxygen content of measurement is less than preset value, is turned by control valve controller increase oxygen glass
Oxygen flow in subflow gauge, simultaneously closes off nitrogen valve, makes dissolved oxygen in testing liquid rise to test desired concn；If
The dissolved oxygen content of measurement is higher than preset value, then increased in nitrogen glass rotameter by control valve controller
Nitrogen flow, simultaneously closes off oxygen valve, makes dissolved oxygen in testing liquid drop to test desired concn.
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| CN106841019A (en) * | 2017-03-14 | 2017-06-13 | 西安热工研究院有限公司 | A kind of full-automatic oxygen-enriched corrosion testing apparatus and method |
| CN107138108A (en) * | 2017-06-21 | 2017-09-08 | 合肥学院 | Device and method for preparing ferrous hydroxide precipitate |
| CN108896474A (en) * | 2018-08-01 | 2018-11-27 | 中国石油天然气集团有限公司 | A kind of corrosion evaluating device and method of high temperature real-time monitoring dissolved oxygen concentration |
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| CN108896474A (en) * | 2018-08-01 | 2018-11-27 | 中国石油天然气集团有限公司 | A kind of corrosion evaluating device and method of high temperature real-time monitoring dissolved oxygen concentration |
| CN108896474B (en) * | 2018-08-01 | 2023-07-25 | 中国石油天然气集团有限公司 | Corrosion evaluation device and method for monitoring concentration of dissolved oxygen at high temperature in real time |
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