CN206470167U - A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate - Google Patents
A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate Download PDFInfo
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- CN206470167U CN206470167U CN201720087185.3U CN201720087185U CN206470167U CN 206470167 U CN206470167 U CN 206470167U CN 201720087185 U CN201720087185 U CN 201720087185U CN 206470167 U CN206470167 U CN 206470167U
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- cathodic protection
- flow rate
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- permeability test
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Abstract
The utility model discloses a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate, the present apparatus is made up of electrochemical experimental device, flow velocity analogue means and flow velocity measuring device, makes simple, cost is low, simple to operate；The utility model can simulate the electrochemistry experiment under 0~6m/s flow velocitys; and scour process is just for working electrode; reference electrode will not be made unstable, the utility model can be used for carrying out different angles, the measure of the Cathodic Protection and hydrogenation electric current different in flow rate for washing away lower typical ocean steel.
Description
Technical field
The utility model is related to Electrochemical Simulation experimental provision, and especially a kind of simulation lower cathodic protection hydrogen different in flow rate oozes
The device tested thoroughly.
Background technology
In recent years, the loss caused due to marine corrosion is increasing, and cathodic protection is the important means of corrosion protection,
Research on cathodic protection potential and hydrogen embrittlement relation has been achieved for certain progress, but studies and all simply focus on negative electrode
How is consequence caused by overprotection, and in depth analysis cathodic protection potential does not penetrate into the process of material internal to hydrogen
Influence.In addition, research before is essentially all to carry out under typical ambient conditions, is seldom related to other rings
Influence of the border factor to cathodic protection potential and hydrogen embrittlement relation.Therefore, research of the utility model based on cathodic protection, main mesh
Be realize cathodic protection potential to hydrogen permeation behavior influence detection, and by hydrogen permeation behavior feature speculate occur hydrogen embrittlement wind
Dangerous size.
Utility model content
The utility model overcomes the complicated defect of the design of revolving low flow velocity simulated defect and pipe stream, realizes different
The flow velocity simulation of size, to carry out Cathodic Protection, while cathodic protection is realized, also achieves the survey of hydrogenation electric current
It is fixed.
The utility model is achieved through the following technical solutions：
A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate, is made up of, flow velocity electrochemical experimental device
Analogue means and flow velocity measuring device, wherein：
The electrochemical experimental device includes cathode pool, anode pool, sample fixed mount, tapping pipe, potentiostat and electrification
Work station is learned, cathode pool is connected with anode pool, cathode pool and anode pool join domain, which are provided with sample fixed mount, to be used to put
Sample is put, cathode pool lower end, which is provided with tapping pipe, is passed through hopper, drain valve, the potentiostat are provided with tapping pipe
Sample, the first reference electrode and the first auxiliary electrode are connected, first reference electrode and the first auxiliary electrode stretch into cathode pool
In interior electrolyte, electrochemical workstation connection sample (sample is the working electrode of three-electrode system in cathode pool,
The working electrode of three-electrode system in anode pool), the second reference electrode and the second auxiliary electrode；
In the above-mentioned technical solutions, the first described reference electrode is saturated calomel electrode, and the first auxiliary electrode is Pt electricity
Pole；
In the above-mentioned technical solutions, the second described reference electrode is saturated calomel electrode, and second auxiliary electrode is
Pt electrodes；
In the above-mentioned technical solutions, described cathode pool side is provided with spillway hole.
The flow velocity analogue means includes hopper, water pump, suction hose, outlet pipe, angle regulator and nozzle；It is described
The water outlet port of suction hose is connected with water pump, and the water inlet port of suction hose is arranged in hopper；The water inlet end of the outlet pipe
Mouth is connected with water pump, is provided with the water outlet port of outlet pipe on angle regulator, angle regulator and is connected with nozzle, institute
Water outlet pipe end is stated to be arranged under the liquid level of electrolyte of cathode pool together with angle regulator and nozzle；
So, water pump is absorbed water by suction hose, and the current for having certain initial flow rate are obtained in effluent pipe mouth, the flow velocity
Current pass through angle regulator and nozzle, obtain final flow rate in nozzle exit, i.e., the stream of simulation is formed about in sample
Speed, (can be filled by adjusting the power (power of pump is bigger, and initial flow rate is bigger) or the angle of nozzle of pump by angular adjustment
Put the injection water for realizing different angles), it is formed about simulating flow velocity in sample；
In the above-mentioned technical solutions, the hopper is cuboid, and the diameter of the suction hose and outlet pipe is significantly less than
The length of tank is high, i.e., the diameter of described suction hose and outlet pipe is compared with the length height of tank, small one to two orders of magnitude, example
Such as select 400x70x50mm sealing flume, (diameter slightly larger than nozzle is by a diameter of 2.5mm of suction hose and outlet pipe
Can), so, compared with whole tank, the diameter of suction hose and outlet pipe is smaller, is merely capable of in water inlet port and water outlet
Near ports produce current, and this current is smaller and will not cause the change of current in whole tank.
The flow velocity measuring device is made up of pressure gauge with Pitot tube, the measurement head of the Pitot tube be arranged at nozzle with
Between sample, the afterbody cross mouthful of the Pitot tube is connected by sebific duct with pressure gauge, and the current of nozzle delivery port flow through Pitot
The measurement head of pipe, produces a pressure, is reacted on pressure gauge, and calculating Pitot tube by pressure gauge measures the dynamic of head
Pressure, utilizes the flow velocity near following formula determination samples；
In formula：V-water flow velocity (m/s)；
K-Pitot tube cofficients；
The dynamic pressure (Pa) for P-measured by Pitot tube；
ρ-fluid (water) density (kg/m3)；
In the above-mentioned technical solutions, the pressure is calculated as U-tube manometer, the afterbody cross mouthful and pressure gauge of the Pitot tube
It is connected by the first sebific duct and the second sebific duct.
A kind of application for the device for simulating lower cathodic protection hydrogen permeability test different in flow rate, is carried out according to the following steps：
Sample is seal-installed on sample fixed mount, anolyte is poured into anode pool, liquid level was not had sample,
Apply constant potential to ionize out by the diffusible hydrogen H of sample internal residual, in the case where keeping anode constant potential, to cathode pool
Middle addition cathode pool electrolyte, is made liquid level not have whole sample, the pressure of current at delivery nozzle is measured using flow velocity measuring device,
And then flow velocity is converted into, connect and start timing after potentiostat, record anode current changes with time, until anode current reaches
To stable state.
In the above-mentioned technical solutions, the thickness of described sample is 0.1-0.3mm.
In the above-mentioned technical solutions, Nickel Plating Treatment is passed through in the side of described sample towards anode pool, and the mode of nickel plating is adopted
With plating.
Compared with prior art, the beneficial effects of the utility model are：
The utility model makes simple, and cost is low, simple to operate；The utility model can be simulated under 0~6m/s flow velocitys
Electrochemistry experiment, and scour process is just for working electrode, reference electrode will not be made unstable.The utility model can be used for carrying out
The measure of different angles, the Cathodic Protection and hydrogenation electric current different in flow rate for washing away lower typical ocean steel.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is flow velocity measuring device partial schematic diagram.
Fig. 3 is hydrogen infiltration of the X65 pipe line steels respectively under static and dynamic condition during application -0.900V cathodic protection potentials
Curve.
Fig. 4 is hydrogen infiltration of the X65 pipe line steels respectively under static and dynamic condition during application -1.00V cathodic protection potentials
Curve.
Fig. 5 is hydrogen infiltration of the X65 pipe line steels respectively under static and dynamic condition during application -1.20V cathodic protection potentials
Curve.
Wherein, 1 is hopper, and 2 be suction hose, and 3 be water pump, and 4 be outlet pipe, and 5 be angle regulator, and 6 be cathode pool,
7 be spillway hole, and 8 be tapping pipe, and 9 be drain valve, and 10 be nozzle, and 11 be sample fixed mount, and 12 be potentiostat, and 13 be electrochemistry
Work station, 14 be anode pool, and 15 be flow velocity measuring device, and 15-1 is Pitot tube, and 15-2 is the first sebific duct, and 15-3 is pressure gauge,
15-4 is the second sebific duct.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate, is made up of, flow velocity electrochemical experimental device
Analogue means and flow velocity measuring device, wherein：
The electrochemical experimental device include cathode pool, anode pool, sample fixed mount, tapping pipe, potentiostat (ZF-3,
Shanghai Electronic Science and Technology Co., Ltd. of pros) and electrochemical workstation (PARSTAT2273 electrochemical test systems, U.S. Pu Linsi
Company), cathode pool is connected with anode pool, and sample fixed mount is provided with for placing in cathode pool and anode pool join domain
Sample, is provided with tapping pipe in cathode pool lower end and is passed through hopper, and drain valve is provided with tapping pipe, and the potentiostat connects
Sample, saturated calomel electrode and Pt electrodes are connect, saturated calomel electrode and Pt electrodes are stretched into the electrolyte in cathode pool, the electricity
(sample is the working electrode of three-electrode system in cathode pool to chem workstation connection sample, is also three electrode system in anode pool
The working electrode of system), Hg/HgO and Pt electrodes；
Described cathode pool side is provided with spillway hole, for preventing the too fast electrolysis hydrorrhea caused in cathode pool of flow velocity
Go out.
The flow velocity analogue means includes hopper, water pump, suction hose, outlet pipe, angle regulator and nozzle；It is described
The water outlet port of suction hose is connected with water pump, and the water inlet port of suction hose is arranged in hopper；The water inlet end of the outlet pipe
Mouth is connected with water pump, is provided with the water outlet port of outlet pipe on angle regulator, angle regulator and is connected with nozzle, institute
Water outlet pipe end is stated to be arranged under the liquid level of electrolyte of cathode pool together with angle regulator and nozzle；
So, water pump is absorbed water by suction hose, and the current for having certain initial flow rate are obtained in effluent pipe mouth, the flow velocity
Current pass through angle regulator and nozzle, obtain final flow rate in nozzle exit, i.e., the stream of simulation is formed about in sample
Speed, (can be filled by adjusting the power (power of pump is bigger, and initial flow rate is bigger) or the angle of nozzle of pump by angular adjustment
Put the injection water for realizing different angles), it is formed about simulating flow velocity in sample；
In the above-mentioned technical solutions, the hopper is cuboid, selects 400x70x50mm sealing flume, suction hose
With a diameter of 2.5mm of outlet pipe, the diameter of suction hose and outlet pipe is smaller, is merely capable of attached in water inlet port and water outlet port
Near to produce current, this current is smaller and will not cause the change of current in whole tank.
The flow velocity measuring device is made up of pressure gauge with Pitot tube, the measurement head of the Pitot tube be arranged at nozzle with
Between sample, the afterbody cross mouthful of the Pitot tube is connected by the first sebific duct and the second sebific duct with pressure gauge, nozzle delivery port
Current flow through the measurement head of Pitot tube, produce a pressure, be reacted on pressure gauge, Pitot tube is calculated by pressure gauge
The dynamic pressure on head is measured, the flow velocity near following formula determination samples is utilized；
In formula：V-water flow velocity (m/s)；
K-Pitot tube cofficients；
The dynamic pressure (Pa) for P-measured by Pitot tube；
ρ-fluid (water) density (kg/m3)；
In the above-mentioned technical solutions, the pressure is calculated as U-tube manometer.
Experimental drug and reagent used in the present embodiment see the table below：
The experimental drug of table 1 and reagent
Laboratory apparatus and equipment used in the present embodiment see the table below：
The laboratory apparatus of table 2 and equipment
Below by way of to exemplified by the cathodic protection of X65 pipe line steels and the research of hydrogen permeation behavior under flowing sea conditions to
The use of upper device is illustrated：
1. the preparation processing of sample
Sample carries out the analysis of hydrogen permeation behavior using X65 steel (chemical composition see the table below), and sample is cut into
40x40mm, thickness is 1mm square sheets, is polished each surface using 100# coarse sandpaper, then successively with 100#,
320#, 600#, 800#, 1000#, 1200#, 1500# abrasive paper for metallograph polishing 40x1mm two surfaces, show sample smooth
It is smooth without iron mold, Nickel Plating Treatment is carried out to wherein one side afterwards；
The chemical composition (mass fraction) of the X65 pipe line steels of table 3
The concrete technology flow process and parameter of nickel plating are as follows：
A. oil removing, by the alkaline degreasing liquid prepared (NaOH (10-15g/L), Na2CO3(30-40g/L)、Na3PO4(25-
35g/L), lauryl sodium sulfate (0.4-0.6g/L), solvent is water) 70 ° are heated to thermostat water bath, sample is placed on and removed
In fluid, it is incubated after 15min and takes out at such a temperature, successively with 70 ° of hot water injection 3min, cold distilled water rinses 2min, uses
It is stand-by after cold wind drying；
B. activate, the sample after oil removing is put into the oxide skin that specimen surface is removed in 5%-10% HCl/water solution, stopped
Stay and taken out after 2min, use distilled water flushing surface, cold wind drying is stand-by；
C. nickel plating, the sample after oil removing and activation is connected with wire with constant voltage dc source, and platinum electrode is used as auxiliary electricity
Pole is connected with the positive pole of power supply, and sample is connected as working electrode with the negative pole of power supply, and then sample is suspended in nickel-plating liquid,
Current density during plating is 1A/dm2, the time is 2min, obtains the uniform nickel layer that one layer of naked eyes can be observed substantially.Nickel-plating liquid
Formula be：Nickel sulfate 260g/L, nickel chloride 45g/L, boric acid 30g/L, lauryl sodium sulfate 0.5g/L, solvent is water；
In Ni-Speed, have hydrogen and enter sample, therefore sample is also placed on to 300 ° of vacuum drying after nickel plating
In case (Tianjin sky Technology Co., Ltd.), two hours of heating carry out dehydrogenation.
2. anode pool dehydrogenation
0.2mol/L NaOH solution is poured into anode pool, then applying 200mV constant potential (vs.Hg/HgO) will try
The diffusible hydrogen H of sample internal residual ionizes out, as anode current I<During 1 μ A, it is believed that reach stabilization；
3. test
In the case where keeping anode constant potential, 3.5%NaCl solution is added into cathode pool, solution was not had whole examination
Sample, the pressure of current at delivery nozzle is measured using flow velocity measuring device, and then is converted into flow velocity, is connected and is started meter after potentiostat
When (t=0), record anode current changes with time, until anode current reaches stable state, stops experiment.
Under static and 2m/s flow velocity, the influence of different cathodic protection potential to hydrogen permeation behavior is respectively such as Fig. 3, figure
Shown in the Hydrogen permeation curve obtained by application -0.90V, -1.00V, -1.20V protection potentials shown in 4 and Fig. 5.
In addition to the hydrogen permeation behavior under measurement is different in flow rate, above-mentioned experimental provision can also pass through angle regulator (example
Such as rotary shaft) and nozzle change the angle of the current of directive sample, to complete the simulation of different angle current, this is used to reach
Experimental provision studies the purpose of hydrogen permeation behavior of the sample under different angle water impacts.
The utility model is described in detail above, but the content is only preferred embodiment of the present utility model,
It is not to be regarded as being used to limit practical range of the present utility model.All equivalent changes made according to present utility model application scope with
Improve etc., all should still it belong within patent covering scope of the present utility model.
Claims (6)
1. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate, it is characterised in that：By electrochemical experimental device
Composition, flow velocity analogue means and flow velocity measuring device, wherein：
The electrochemical experimental device includes cathode pool, anode pool, sample fixed mount, tapping pipe, potentiostat and electrochemistry work
Stand, cathode pool is connected with anode pool, cathode pool and anode pool join domain be provided with sample fixed mount be used for place examination
Sample, is provided with tapping pipe in cathode pool lower end and is passed through hopper, and drain valve, the potentiostat connection are provided with tapping pipe
Sample, the first reference electrode and the first auxiliary electrode, first reference electrode and the first auxiliary electrode are stretched into cathode pool
In electrolyte, the electrochemical workstation connection sample, the second reference electrode and the second auxiliary electrode；
The flow velocity analogue means includes hopper, water pump, suction hose, outlet pipe, angle regulator and nozzle；The water suction
The water outlet port of pipe is connected with water pump, and the water inlet port of suction hose is arranged in hopper；The water inlet port of the outlet pipe with
Water pump be connected, be provided with the water outlet port of outlet pipe on angle regulator, angle regulator and be connected with nozzle, it is described go out
Water pipe end is arranged under the liquid level of electrolyte of cathode pool together with angle regulator and nozzle；
The flow velocity measuring device is made up of pressure gauge with Pitot tube, and the measurement head of the Pitot tube is arranged at nozzle and sample
Between, the afterbody cross mouthful of the Pitot tube is connected by sebific duct with pressure gauge.
2. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate according to claim 1, its feature exists
In：The first described reference electrode is saturated calomel electrode, and the first auxiliary electrode is Pt electrodes.
3. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate according to claim 1, its feature exists
In：The second described reference electrode is Hg/HgO, and second auxiliary electrode is Pt electrodes.
4. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate according to claim 1, its feature exists
In：Described cathode pool side is provided with spillway hole.
5. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate according to claim 1, its feature exists
In：The hopper is cuboid, and the diameter of the suction hose and outlet pipe is significantly less than the length height of hopper.
6. a kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate according to claim 1, its feature exists
In：The pressure is calculated as U-tube manometer, and the afterbody cross mouthful of the Pitot tube passes through the first sebific duct and the second sebific duct with pressure gauge
It is connected.
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| CN201720087185.3U CN206470167U (en) | 2017-01-23 | 2017-01-23 | A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate |
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| CN201720087185.3U CN206470167U (en) | 2017-01-23 | 2017-01-23 | A kind of device for simulating lower cathodic protection hydrogen permeability test different in flow rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796739A (en) * | 2017-10-17 | 2018-03-13 | 中石化炼化工程（集团）股份有限公司 | The devices and methods therefor that metallic hydrogen penetrating quality is tested under wet gas environments |
| CN112114169A (en) * | 2020-08-26 | 2020-12-22 | 哈尔滨工业大学 | Double-electrolytic-cell device for micro-area electrochemical test and using method thereof |
| CN112539996A (en) * | 2019-09-23 | 2021-03-23 | 天津大学 | Method for determining cathodic protection negative critical potential interval |
-
2017
- 2017-01-23 CN CN201720087185.3U patent/CN206470167U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796739A (en) * | 2017-10-17 | 2018-03-13 | 中石化炼化工程（集团）股份有限公司 | The devices and methods therefor that metallic hydrogen penetrating quality is tested under wet gas environments |
| CN107796739B (en) * | 2017-10-17 | 2020-06-12 | 中石化炼化工程（集团）股份有限公司 | Device and method for testing metal hydrogen permeability in moisture environment |
| CN112539996A (en) * | 2019-09-23 | 2021-03-23 | 天津大学 | Method for determining cathodic protection negative critical potential interval |
| CN112114169A (en) * | 2020-08-26 | 2020-12-22 | 哈尔滨工业大学 | Double-electrolytic-cell device for micro-area electrochemical test and using method thereof |
| CN112114169B (en) * | 2020-08-26 | 2021-08-10 | 哈尔滨工业大学 | Double-electrolytic-cell device for micro-area electrochemical test and using method thereof |
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Granted publication date: 20170905 Termination date: 20200123 |