CN207181255U - A kind of 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium - Google Patents
A kind of 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium Download PDFInfo
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- CN207181255U CN207181255U CN201721088586.7U CN201721088586U CN207181255U CN 207181255 U CN207181255 U CN 207181255U CN 201721088586 U CN201721088586 U CN 201721088586U CN 207181255 U CN207181255 U CN 207181255U
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Abstract
The utility model discloses 90 ° of elbow metal erosion electrochemical testing devices in a kind of p-type Flow Corrosion medium, including：With 90 ° of elbows pipeline structure snd size identical glass pipe to be measured, glass pipe is horizontally disposed with, the glass pipe is made up of 90 degree of crooked pipeline sections, first straight line duct section and second straight line duct section, and first straight line duct section is vertical with second straight line duct section and the first straight line duct section connects with port of the second straight line duct section respectively with 90 degree of crooked pipeline sections both ends；Multiple glass manifolds are communicated with the glass pipe.90 ° of elbow metal erosion electrochemical testing devices in the utility model p-type Flow Corrosion medium, for carrying out real-time electrochemical corrosion measurement to the metal to be measured of pipeline elbow in flowing corrosive medium, break the limitation of the corrosion test of existing electrochemical monitoring device research straight length, thus more complete and accurate simulation and the running situation and corrosion behavior of whole water supply line can be studied.
Description
Technical field
The utility model belongs to electrochemical corrosion field of measuring technique, relates in particular to a kind of p-type Flow Corrosion medium
In 90 ° of elbow metal erosion electrochemical testing devices.
Background technology
China's feedwater piping and regeneration waterpipe are mainly metal material, every year because pipe network model can all produce huge energy
Source and economic loss, and Metal pipeline corrosion is one of major reason of pipe network model failure, and especially elbow corrosion damage
It is bad serious.A kind of means of the electrochemical measuring method as observation material corrosion resisting property, due to it is quick, can continuous monitoring etc. it is excellent
Put and be widely used in the experimental study of metal feedwater pipeline corrosion.But existing electrochemical monitoring device focuses mostly on straight in research
The corrosion test of pipeline section, the less corrosion behavior for considering bend part still can not be to elbow metal material in flowing corrosive medium
Material carries out electrochemical corrosion effectively in real time and measured, and can not obtain the corrosion data during its Dynamic Corrosion, while because of elbow
Locate the problems such as working electrode makes cumbersome and installation difficulty, limit electrochemical method and led in the metal erosion of water supply line elbow
The application in domain.
Utility model content
In view of the shortcomings of the prior art, the purpose of this utility model in a kind of p-type Flow Corrosion medium is provided 90 ° it is curved
Head metal erosion electrochemical testing device, 90 ° of elbow metal erosion electrochemical testing devices can be with the p-type Flow Corrosion medium
The circulatory system is accessed by the port at glass pipe both ends, the electrochemistry dynamic monitoring of corrosive medium is carried out, solves prior art
Pipeline elbow metal material in flowing corrosive medium can not be carried out existing for middle electrochemical corrosion measurement electric effectively in real time
The problem of chemical attack measures, so that the running situation and corrosion of more complete and accurate simulation and the whole water supply line of research are gone
To take into full account that Flow Field Distribution produces influence of the difference to corrosion on elbow different cross section.
The purpose of this utility model is achieved by following technical proposals.
90 ° of elbow metal erosion electrochemical testing devices in a kind of Flow Corrosion medium, including：With 90 ° of swan necks to be measured
Road structure snd size identical glass pipe, the glass pipe are horizontally disposed with, the glass pipe by 90 degree of crooked pipeline sections,
First straight line duct section and second straight line duct section composition, the first straight line duct section is vertical with second straight line duct section and should
First straight line duct section connects with port of the second straight line duct section respectively with 90 degree of crooked pipeline sections both ends；
3 spaced glass manifolds are respectively communicated with the opposite sides of the first straight line duct section, described
The opposite sides of second straight line duct section has been respectively communicated with 2 spaced glass manifolds, positioned at the first straight line pipeline
The glass manifold of section and second straight line duct section opposite sides is respectively symmetrically set；Connect in the side of 90 degree of crooked pipeline sections
3 spaced glass manifolds are connected with, the opposite side relative with the side is communicated with N number of glass manifold；
Wherein, the inside of the glass manifold on the glass pipe is used to insert 1 working electrode or 1 reference electricity
Pole, the working electrode include：Metal cylinder and the polytetrafluoroethylene floor being packed in outside the cylinder periphery；The metal
The material of cylinder is metal to be measured, and the metal cylinder is used to contact the corruption in glass pipe close to the end face of glass pipe
Medium is lost, each end face is generally aligned in the same plane with closing on the glass pipe inwall of the end face；In the first straight line pipeline
The platinum guaze of a tubular is set with as auxiliary electrode in section or port of the second straight line duct section away from 90 degree of crooked pipeline sections；
When 3 glass manifolds in 90 degree of crooked pipeline sections and N number of glass manifold are curved positioned at described 90 degree respectively
Where bent duct section during the upper side and lower side of plane, the glass manifold positioned at described 90 degree of crooked pipeline sections the upper side and lower side is symmetrical
Set, the N=3；
When 3 glass manifolds in 90 degree of crooked pipeline sections and N number of glass manifold are curved positioned at described 90 degree respectively
When the inner curved outer wall of bent duct section and outer curved outer wall, the N=1, outside 90 degree of inner curved surfaces of crooked pipeline section
The glass manifold quantity of wall is 1, and the glass manifold quantity positioned at 90 degree of outer curved outer walls of crooked pipeline section is 3, and from
Start to be followed successively by first positioned at 3 glass manifolds of 90 degree of outer curved outer walls of crooked pipeline section close to first straight line duct section
Pipe, the second branch pipe and the 3rd branch pipe, the glass manifold positioned at inner curved outer wall are relative with the position of second branch pipe.
In the above-mentioned technical solutions, lead on the outer peripheral face of the polytetrafluoroethylene floor formed with screw thread, the working electrode
This is crossed to be threaded into corresponding glass manifold.
In the above-mentioned technical solutions, the length of the platinum guaze is 25~45mm.
In the above-mentioned technical solutions, the external diameter of the glass manifold is 15~30mm, and internal diameter is 9~26mm, length 30
~50mm.
In the above-mentioned technical solutions, the radius of the metal cylinder is 4~10mm.
In the above-mentioned technical solutions, a polytetrafluoroethylene (PTFE) screw socket is separately installed with the port of the glass pipe both sides
Joint.
In the above-mentioned technical solutions, it is respectively connected with metal joint on the working electrode, reference electrode and auxiliary electrode.
In the above-mentioned technical solutions, the reference electrode is saturated calomel reference electrode.
In the above-mentioned technical solutions, positioned at the first straight line duct section and the glass of second straight line duct section opposite sides
Branch pipe is respectively perpendicular to the first straight line duct section or second straight line duct section connected with the glass manifold.
In the above-mentioned technical solutions, as the N=3, positioned at plane upper side where 90 degree of crooked pipeline sections with
The glass manifold of side is vertical with plane where 90 degree of crooked pipeline sections.
In the above-mentioned technical solutions, as the N=1, positioned at 90 degree of crooked pipeline sections inner curved outer wall and
The glass manifold of outer curved outer wall is respectively positioned on 90 degree of crooked pipelines section institute in the plane.
A kind of simulation flowing corrosive medium is entered as steps described below to the measuring method of elbow pipeline electrochemical corrosion
OK：
Step 1,90 ° of elbow metal erosion electrochemical testing devices in above-mentioned Flow Corrosion medium are established, at every 2 mutually
Installment work electrode and reference electrode are distinguished in the glass manifold connected symmetrically and with the first straight line duct section, at every 2
Installment work electrode and reference electrode are distinguished in the glass manifold connected symmetrically and with the second straight line duct section；
As the N=3, at every 2 symmetrically and respectively positioned at described 90 degree of crooked pipeline sections the upper side and lower side
Installment work electrode and reference electrode are distinguished in glass manifold；As the N=1, in the second branch pipe and curved positioned at described 90 degree
1 working electrode is installed respectively in the glass manifold of the bent inner curved outer wall of duct section, distinguished in the first branch pipe and the 3rd branch pipe
Installment work electrode and reference electrode；
Step 2, the corrosive medium of liquid is continually fed into the glass pipe, by the working electrode, reference electrode
Electrochemical workstation is connected to by electrode cable plug respectively with the metal joint on auxiliary electrode, starts the electrochemistry work
Stand, after OCP is stable, starts to measure, obtain corrosion electric current density and ac impedance spectroscopy.
In the step 2, the stable standard of the OCP is floated for open-circuit voltage values is less than or equal to 0.001V.
Step 2 gained corrosion electric current density is calculated using three parameter fitting methods, obtains each working electrode
Close to instantaneous corrosion rate (mm/a) value of the end face of glass pipe in corrosive medium；
Step 2 gained ac impedance spectroscopy is fitted using equivalent circuit method, obtains each working electrode close to glass
The end face of pipeline electronic transfer process and impedance structure of formation in corrosion process.
Compared to prior art, 90 ° of elbow metal erosion electro-chemical test dresses in Flow Corrosion medium of the present utility model
That puts has the beneficial effect that：
1st, 90 ° of elbow metal erosion electrochemical testing devices in the utility model Flow Corrosion medium, for flowing
The metal to be measured of pipeline elbow carries out real-time electrochemical corrosion measurement in corrosive medium, breaks existing electrochemical monitoring device
Study the limitation of the corrosion test of straight length, thus more complete and accurate simulation and the operation of whole water supply line can be studied
Situation and corrosion behavior；
2nd, the utility model device has Flow Corrosion medium by utilizing to study work made of metal to be measured when in use
Make three electrode measurement systems of electrode, electrochemistry can be carried out to studying corrosion process of the metal to be measured in Flow Corrosion medium
Measurement；
3rd, the material of the metal cylinder of working electrode can need to change according to research, suitable for carrying out various metals material
Corrosion monitoring；
4th, the utility model secures the relative position between working electrode, reference electrode and auxiliary electrode, be easy into
The repeated corrosion monitoring experiment of row；
5th, the utility model has taken into full account that Flow Field Distribution produces influence of the difference to corrosion on elbow different cross section, with
And it is responsible for caliber by water flowing and electrode glass branch diameter is installed and limited, it is impossible to four glass is arranged circumferentially on glass pipe
Glass branch pipe, therefore two class devices can be designed to according to the technical solution of the utility model：Positioned at the upside of 90 degree of crooked pipeline sections and
Downside (following L-types) and the inner curved outer wall and outer curved outer wall (following p-types) positioned at 90 degree of crooked pipeline sections, so as to
In all directions, elbow (inner side, outside, top, bottom) is treated more in complete and accurate simulation and research Flow Corrosion medium
Survey corrosion of metal behavior.
6th, the utility model device connecting multi-channel electrochemical workstation can be realized while to all Electrode point positions reality
Testing amount, reduces fluid flow conditions that is, the dual uncertainty of corrosive environment and electro-chemical test means, ensure that reality
Test that background value is consistent and the reliability of result.
Brief description of the drawings
Fig. 1 is that 90 ° elbow metal erosion electrochemical testing device (p-type) bows in Flow Corrosion medium of the present utility model
View；
Fig. 2 is that 90 ° elbow metal erosion electrochemical testing device (L-type) bows in Flow Corrosion medium of the present utility model
View；
Fig. 3 is 90 ° of elbow metal erosion electrochemical testing devices (p-type) in Flow Corrosion medium of the present utility model in corruption
Each working electrode corrosion rate changes over time figure when erosion velocity of medium is 1m/s；
Fig. 4 is 90 ° of elbow metal erosion electrochemical testing devices (p-type) in Flow Corrosion medium of the present utility model in corruption
Lose the AC impedance spectroscopy of each working electrode when velocity of medium is 1m/s；
Fig. 5 is 90 ° of elbow metal erosion electrochemical testing devices (L-type) in Flow Corrosion medium of the present utility model in corruption
The corrosion rate of each working electrode changes over time figure when erosion velocity of medium is 1m/s；
Fig. 6 is 90 ° of elbow metal erosion electrochemical testing devices (L-type) in Flow Corrosion medium of the present utility model in corruption
Lose the AC impedance spectroscopy of each working electrode when velocity of medium is 1m/s.
Wherein, 1 is glass pipe, and 2 be polytetrafluoroethylene (PTFE) screw joint, and 3 be platinum guaze, and 4 be glass manifold, 4-1 first
Branch pipe, 4-2 are the second branch pipe, and 4-3 is the 3rd branch pipe, and 4-4 is the 4th branch pipe, and 4-5 is the 5th branch pipe, and 4-6 is the 6th branch pipe, S1
For first straight line duct section, S2 is second straight line duct section.
Embodiment
In the technical solution of the utility model, electrochemical workstation connecting multi-channel expander.The utility model with it is more
Passage electrochemical workstation is combined, and can monitor the electrochemical parameter of multiple working electrodes on-line simultaneously.Real-time corrosion monitoring uses
Three electrode measurement systems, its operation principle are that working electrode is the metal material to be studied, and auxiliary electrode is in order to electric with work
Pole forms current loop, because the electrode potential of reference electrode is constant under certain condition, as long as therefore measuring working electrode and reference
Potential difference between electrode, you can know the electrode potential of working electrode.Between another aspect working electrode and auxiliary electrode
Electric current can be determined, and corresponding electrochemical profiles can be obtained with reference to the measurement result of electric current.Pass through ac impedance spectroscopy, electrokinetic potential
The measurement means such as scanning, OCP, the corrosion data in corrosion process under static or current system can be accurately obtained, so as to mould
Intend, study the corrosion behavior of elbow (inner side, outside, top, bottom) metal material in Flow Corrosion medium.
In specific embodiment of the present utility model, exemplified by the elbow to study ductile cast iron material pipeline is corroded,
Corrosive medium is running water, and reference electrode is saturated calomel reference electrode, and metal to be measured is commercially available QT500-10 spheroidal graphite cast-iron.
The technical solution of the utility model is further illustrated with reference to specific embodiment.
Embodiment 1 (90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium)
As shown in figure 1, including：With 90 ° of elbows pipeline structure snd size identical glass pipe (glass pipe internal diameter to be measured
For 50mm), glass pipe be made up of 90 degree of crooked pipeline sections, first straight line duct section S1 and second straight line duct section S2 (S1 and
Glass pipe between S2 is 90 degree of crooked pipeline sections), glass pipe is horizontally disposed with, 90 degree of crooked pipeline sections, first straight line pipe
Road section and second straight line duct section are located at same level.First straight line duct section it is vertical with second straight line duct section and this first
The port of rectilinear duct section and second straight line duct section respectively with 90 degree of crooked pipeline section both ends connects, in glass pipe both sides
A polytetrafluoroethylene (PTFE) screw joint is separately installed with port, for accessing the circulatory system.90 degree of crooked pipeline sections are along its curve
The radial symmetric of section, line of symmetry to the length of end of the first straight line duct section away from the line of symmetry of 90 degree of crooked pipeline sections are
200mm, the length to end of the second straight line duct section away from the line of symmetry are 150mm.
First straight line duct section in the horizontal direction on opposite sides be respectively communicated with 3 interval 50mm set glass
Branch pipe, second straight line duct section in the horizontal direction on opposite sides be respectively communicated with 2 interval 50mm set glass branch
Pipe, the glass manifold positioned at first straight line duct section and second straight line duct section opposite sides are respectively symmetrically set；And positioned at the
The glass manifold of one rectilinear duct section and second straight line duct section opposite sides is respectively perpendicular to connected with the glass manifold
One rectilinear duct section or second straight line duct section.3 intervals are communicated with the outer curved outer wall side of 90 degree of crooked pipeline sections
The glass manifold of setting, the opposite side relative with the side (i.e. inner curved outer wall) are communicated with 1 glass manifold：6th branch pipe 4-
6.3 glass manifolds positioned at 90 degree of outer curved outer walls of crooked pipeline section since close to first straight line duct section are followed successively by the
One branch pipe 4-1, the second branch pipe 4-2 and the 3rd branch pipe 4-3, the 6th branch pipe 4-6 are relative with the position of the second branch pipe.
The external diameter of all glass manifolds is 24mm, internal diameter 20mm, wall thickness 2mm, length 40mm；In the glass tube
The inside of glass manifold on road is used to inserting 1 working electrode or 1 reference electrode that (glass manifold caliber value to be with technique
License and to hold as small as possible under conditions of working electrode be principle), working electrode includes：Metal cylinder and it is packed in this
Polytetrafluoroethylene floor outside cylinder periphery；The material of metal cylinder is metal to be measured (commercially available QT500-10 spheroidal graphites casting
Iron), radius 4mm.Corresponding glass is threaded into by this formed with screw thread, working electrode on the outer peripheral face of polytetrafluoroethylene floor
(formed with screw thread in glass manifold) is closely connected in glass branch pipe and with glass manifold inwall, prevents glass pipe internal corrosion medium
Ooze out.
Metal cylinder is (exposed) for contacting the corrosive medium in glass pipe close to the end face of glass pipe, per one end
Face is generally aligned in the same plane with closing on the glass pipe inwall of the end face；In first straight line duct section away from 90 degree of crooked pipeline sections
The platinum guaze of a tubular is set with port as auxiliary electrode, the length of platinum guaze is 30mm；
Metal joint is respectively connected with working electrode, reference electrode and auxiliary electrode.
Simulation flowing corrosive medium is carried out as steps described below to the measuring method of elbow pipeline electrochemical corrosion：
Step 1,90 ° of elbow metal erosion electrochemical testing devices in above-mentioned Flow Corrosion medium are established, in glass pipe
Exit sets the flowmeter outlet of corrosive medium (port of first straight line pipeline be), at every 2 symmetrically and with first
Installment work electrode and reference electrode respectively in the glass manifold of rectilinear duct section connection, at every 2 symmetrically and with second
Distinguish installment work electrode and reference electrode in the glass manifold of rectilinear duct section connection,
1 working electrode is installed respectively in the second branch pipe and the 6th branch pipe, in the first branch pipe installment work electrode,
Three branch pipes install reference electrode；The working electrode in working electrode and the second branch pipe in 6th branch pipe is shared in the 3rd branch pipe
Reference electrode.2 symmetrical glass manifolds on first straight line duct section adjacent to 90 degree of crooked pipeline sections are respectively the 4th
Pipe 4-4 (working electrode) and the 5th branch pipe 4-5 (reference electrode).The work in working electrode and the 4th branch pipe in first branch pipe
Electrode shares the reference electrode in the 5th branch pipe.
In order to study 90 ° of elbow metal erosion electrochemical testing devices (p-type) in Flow Corrosion medium of the present utility model
Instantaneous corrosion rate (mm/a) value and each working electrode of the working electrode in corrosive medium close to the end of glass pipe
Face electronic transfer process and impedance structure of formation in corrosion process.Working electrode in the present embodiment and reference electrode are entered
Line label, counted since the entrance (port of second straight line pipeline is the entrance of corrosive medium) of corrosive medium, it is curved positioned at 90 °
Electrode in the glass manifold of head pipeline configuration outside curve outer wall is followed successively by P1, P2, PF, P3, P4, P5, P6 and P7；From corrosion
The entrance of medium starts to count, the electrode in the glass manifold of 90 ° of elbow pipeline configuration inner curve outer walls be followed successively by PA,
PB, P8, PC, PD and PE.Wherein, P1~P8 is working electrode, and PA~PF is reference electrode.Working electrode P3, P8 share reference
Electrode PF, working electrode P4, P5 share reference electrode PC.When measuring the potential difference between working electrode and reference electrode, position
It is in the reference electrode corresponding to the working electrode on first straight line duct section and second straight line duct section：With the working electrode position
Put symmetrical reference electrode.
Step 2, the corrosive medium of liquid is continually fed into glass pipe, and (port of second straight line pipeline is corrosive medium
Entrance, the port of first straight line pipeline is the outlet of corrosive medium), by working electrode, reference electrode and auxiliary electrode
Metal joint is connected to electrochemical workstation by electrode cable plug respectively, treats flow (the work electricity of exit corrosive medium
Pole surface velocity) it is stable after (fluctuation range is in actual flow velocity ± 0.1m/s), start electrochemical workstation, treat that OCP is steady
After fixed (the stable standard of OCP is floated for open-circuit voltage values is less than or equal to 0.001V), start to measure, obtain corrosion current
Density and ac impedance spectroscopy；
In specific embodiment of the present utility model, the supporting test software of electrochemical workstation is CorrTest, tool
Bulk measurement method is：Input the density of material 7.8g/cm of metal to be measured3, materials chemistry equivalent 28, working electrode area 0.5cm2、
Reference electrode type is 25 DEG C of saturated calomel electrode and corrosive medium temperature, and it is steady-state polarization dynamic potential scanning to select measuring method
With AC impedance-frequency scanning, scanning current potential -0.05V~0.05V is set respectively in the measuring method (relative to open circuit
Current potential), sweep speed 0.1mV/s, alternating-current magnitude 10mV, frequency test scope 100KHz to 0.01Hz.
Step 2 gained corrosion electric current density is calculated using three parameter fitting methods, it is close to obtain each working electrode
Instantaneous corrosion rate (mm/a) value of the end face of glass pipe in corrosive medium；
Analysis is fitted to step 2 gained ac impedance spectroscopy using equivalent circuit method, it is close to obtain each working electrode
The end face of glass pipe electronic transfer process and impedance structure of formation in corrosion process.
Fig. 3 is 90 ° of elbow metal erosion electrochemical testing devices (p-type) in Flow Corrosion medium of the present utility model in corruption
Each working electrode corrosion rate changes over time figure when erosion velocity of medium is 1m/s.Analysis, which can obtain, such as draws a conclusion：Each work
Electrode erosion rate is overall as experimental period is on a declining curve；There is larger difference between each working electrode corrosion rate：It is curved
Working electrode P3 has minimal erosion speed on the outside of head section, and P1, P2 and P4 corrosion rate ratio P3 of second straight line duct section are bigger,
P6, P7 and P8 are that first straight line duct section has larger corrosion rate, and higher than second straight line duct section, and work is electric on the inside of elbow section
Pole P5 has maximum corrosion rate.
Fig. 4 is 90 ° of elbow metal erosion electrochemical testing devices (p-type) in Flow Corrosion medium of the present utility model in corruption
Lose the AC impedance spectroscopy of each working electrode when velocity of medium is 1m/s.Analysis is understood：For p-type pipe fitting, each work electricity
The result of pole is in two capacitive reactance arcs, illustrates also have a state variable to influence current density in addition to current potential E；Each working electrode
Impedance spectra is disperseed, had levels, low frequency range capacitive reactance arc it is obvious it is outer be flow velocity is minimum on pipe fitting research point position P3, then point
It is not P4, P1 and P2, P6, P7, P8, innermost side is the maximum research point position P5 of flow velocity；In addition, high frequency region capacitive reactance arc radius
It is bigger, illustrate that impedance value is very important caused by electric double layer.
It can be obtained after selecting suitable Equivalent Circuit Fitting：Electrode surface impedance structure is except intrinsic electric double layer capacitance
Outside, the capacitive film layer covered outside it also be present；Spheroidal graphite cast-iron surface corrosion impedance is essentially from electric double layer and electron transmission mistake
Journey, each point position internal layer impedance value are above outer layer impedance value, illustrate that internal impedance film turns into the main obstruction of corrosion process；In elbow
At the P5 of inner side, ectonexine impedance value is smaller, but occurs high impedance value at elbow outside P 3, P4, deducibility inner side of elbow is not
More abundant Impedance Membrane is easily formed, and on the outside of elbow and straight length outside is then on the contrary.
Embodiment 2 (L-type)
As shown in Fig. 2 including：With 90 ° of elbows pipeline structure snd size identical glass pipe (glass pipe internal diameter to be measured
For 50mm), glass pipe is made up of 90 degree of crooked pipeline sections, first straight line duct section and second straight line duct section, glass pipe
Horizontally disposed, 90 degree of crooked pipeline sections, first straight line duct section and second straight line duct section are located at same level.First straight line
Duct section is vertical with second straight line duct section and the first straight line duct section and second straight line duct section respectively with 90 degree of swan-necks
The port connection at road section both ends, is separately installed with a polytetrafluoroethylene (PTFE) screw joint on the port of glass pipe both sides.90 degree
Radial symmetric of the crooked pipeline section along its curved section, the line of symmetry of 90 degree of crooked pipeline sections are right away from this to first straight line duct section
The length of the end of line is referred to as 200mm, and the length to end of the second straight line duct section away from the line of symmetry is 150mm.
3 spaced glass manifolds are respectively communicated with the opposite sides of first straight line duct section, in second straight line
The opposite sides of duct section has been respectively communicated with 2 spaced glass manifolds, in the opposite sides point of 90 degree of crooked pipeline sections
3 spaced glass manifolds are not communicated with, wherein, opposite sides is the opposite sides on vertically, i.e., 90 degree are curved
The upper side and lower side of plane where bent duct section.Positioned at first straight line duct section, 90 degree of crooked pipeline sections and second straight line pipeline
The glass manifold of section opposite sides is respectively symmetrically set；Positioned at first straight line duct section and second straight line duct section opposite sides
Glass manifold is respectively perpendicular to the first straight line duct section connected with the glass manifold or second straight line duct section.It is curved positioned at 90 degree
The glass manifold of plane upper side and downside where bent duct section is vertical with plane where 90 degree of crooked pipeline sections.
The external diameter of glass manifold is 24mm, internal diameter 20mm, wall thickness 2mm, length 40mm；On the glass pipe
The inside of glass manifold be used to inserting 1 working electrode or 1 reference electrode (glass manifold caliber value with technique license and
It is principle that can hold as small as possible under conditions of working electrode), working electrode includes：Metal cylinder and it is packed in the cylinder
Polytetrafluoroethylene floor outside periphery；The material of metal cylinder is metal to be measured (commercially available QT500-10 spheroidal graphite cast-iron), radius
For 4mm.It is threaded on the outer peripheral face of polytetrafluoroethylene floor formed with screw thread, working electrode by this in corresponding glass manifold
And (formed with screw thread in glass manifold) is closely connected with glass manifold inwall, prevent glass pipe internal corrosion medium from oozing out.
Metal cylinder is (exposed) for contacting the corrosive medium in glass pipe close to the end face of glass pipe, per one end
Face is generally aligned in the same plane with closing on the glass pipe inwall of the end face；In first straight line duct section away from 90 degree of crooked pipeline sections
The platinum guaze of a tubular is set with port as auxiliary electrode, the length of platinum guaze is 30mm；
Metal joint is respectively connected with working electrode, reference electrode and auxiliary electrode.
Simulation flowing corrosive medium is carried out as steps described below to the measuring method of elbow pipeline electrochemical corrosion：
Step 1,90 ° of elbow metal erosion electrochemical testing devices in above-mentioned Flow Corrosion medium are established, in glass pipe
Exit sets the flowmeter outlet of corrosive medium (port of first straight line pipeline be), at every 2 symmetrically and with first
Installment work electrode and reference electrode respectively in the glass manifold of rectilinear duct section connection, at every 2 symmetrically and with second
Installment work electrode and reference electrode are distinguished in the glass manifold of rectilinear duct section connection, every 2 symmetrical and difference positions
Installment work electrode and reference electrode are distinguished in the glass manifold of 90 degree of crooked pipeline section the upper side and lower side；
In order to study 90 ° of elbow metal erosion electrochemical testing devices (L-type) in Flow Corrosion medium of the present utility model
Instantaneous corrosion rate (mm/a) value and each working electrode of the working electrode in corrosive medium close to the end of glass pipe
Face electronic transfer process and impedance structure of formation in corrosion process.Working electrode in the present embodiment and reference electrode are entered
Line label, counted since the entrance of corrosive medium (entrance that the port of second straight line pipeline is corrosive medium), it is curved positioned at 90 °
The electrode in glass manifold on the upside of head pipeline configuration is followed successively by L1, L2, L3, L4, L5, L6, L7 and L8；From entering for corrosive medium
Mouthful start to count, the electrode in the glass manifold of 90 ° of elbow pipeline structure undersides be followed successively by LA, LB, LC, LD, LE, LF,
LG and LH.Wherein, L1~L8 is working electrode, and LA~LH is reference electrode (not shown).In measurement working electrode and ginseng
During than potential difference between electrode, the work on first straight line duct section, 90 degree of crooked pipeline sections and second straight line duct section
Making the reference electrode corresponding to electrode is：The symmetrical reference electrode with the working electrode position.
Step 2, the corrosive medium of liquid is continually fed into glass pipe, and (port of second straight line pipeline is corrosive medium
Entrance, the port of first straight line pipeline is the outlet of corrosive medium), by working electrode, reference electrode and auxiliary electrode
Metal joint is connected to electrochemical workstation by electrode cable plug respectively, treats flow (the work electricity of exit corrosive medium
Pole surface velocity) it is stable after (fluctuation range is in actual flow velocity ± 0.1m/s), start electrochemical workstation, treat that OCP is steady
After fixed (the stable standard of OCP is floated for open-circuit voltage values is less than or equal to 0.001V), start to measure, obtain corrosion current
Density and ac impedance spectroscopy；
In specific embodiment of the present utility model, the supporting test software of electrochemical workstation is CorrTest, tool
Bulk measurement method is：Input the density of material 7.8g/cm of metal to be measured3, materials chemistry equivalent 28, working electrode area 0.5cm2、
Reference electrode type is 25 DEG C of saturated calomel electrode and corrosive medium temperature, and it is steady-state polarization dynamic potential scanning to select measuring method
With AC impedance-frequency scanning, scanning current potential -0.05V~0.05V is set respectively in the measuring method (relative to open circuit
Current potential), sweep speed 0.1mV/s, alternating-current magnitude 10mV, frequency test scope 100KHz to 0.01Hz.
Step 2 gained corrosion electric current density is calculated using three parameter fitting methods, it is close to obtain each working electrode
Instantaneous corrosion rate (mm/a) value of the end face of glass pipe in corrosive medium；
Analysis is fitted to step 2 gained ac impedance spectroscopy using equivalent circuit method, it is close to obtain each working electrode
The end face of glass pipe electronic transfer process or dynamic information of surface course of reaction in corrosion process.
Fig. 5 is 90 ° of elbow metal erosion electrochemical testing devices (L-type) in Flow Corrosion medium of the present utility model in corruption
The corrosion rate of each working electrode changes over time figure when erosion velocity of medium is 1m/s.Analysis, which can obtain, such as draws a conclusion：Each point position
Corrosion rate is overall as experimental period is on a declining curve；It is variant between the electrode erosion rate of each point position, but be not very big, divide
Cloth compares concentration；Research point position L5 is that elbow has minimal erosion speed, and L4 corrosion rate and L5 is very close to L6, L7, L8 are
First straight line duct section (corrosive medium outlet section) corrosion rate is larger, and L1, L2, L3 are second straight line duct section (corrosive medium
Entrance) take second place.
Fig. 6 is 90 ° of elbow metal erosion electrochemical testing devices (L-type) in Flow Corrosion medium of the present utility model in corruption
Lose the AC impedance spectroscopy of each working electrode when velocity of medium is 1m/s.Analysis is understood：For L-type pipe fitting, each work electricity
The impedance spectra of pole is in two capacitive reactance arcs, and high frequency region capacitive reactance arc radius is larger；The impedance spectra of each working electrode is mutual
Between relatively, low frequency range capacitive reactance arc it is obvious in the outer part be the minimum research point position L5 of the upper speed of L-type feedwater pipe fitting, secondly
It is L4, L1, L2, L3, innermost side is L6, L7, L8.
It can be obtained after selecting suitable Equivalent Circuit Fitting：Electrode surface impedance structure is except intrinsic electric double layer capacitance
Outside, the capacitive film layer covered outside it also be present；Spheroidal graphite cast-iron surface corrosion impedance is essentially from electric double layer and electron transmission mistake
Journey, each point position internal layer impedance value are above outer layer impedance value, illustrate that internal impedance film turns into the main obstruction of corrosion process；In elbow
Easily there is high impedance value at tube top (bottom) L5, ectonexine impedance value is bigger, and impedance value is relatively low at remaining point position, can
Infer that elbow tube top (bottom) easily forms more abundant Impedance Membrane, and straight length position tube top (bottom) is then on the contrary.
Thus prove, the utility model can carry out real to the metal material at channel bend each point position in flowing corrosive medium
When electrochemical corrosion measure, analyze its corrosion rate and surface impedance structure, so as in all directions, complete and accurate simulation and grind
Study carefully the corrosion behavior of elbow metal material in Flow Corrosion medium.The utility model on the one hand can be in flowing corrosive medium
Metal material at channel bend carries out real-time electrochemical corrosion measurement, breaks existing electrochemical monitoring device research straight length
Corrosion test limitation, the working electrode material in another aspect device can need to change according to research, more suitable for carrying out
The corrosion monitoring of kind metal material, the adaptability of device is enhanced, and apparatus structure is simple, convenient experimental operation, can connect more
The realization of passage electrochemical workstation is implemented to measure to all Electrode point positions simultaneously, ensure that Experimental Background value is consistent and ties
The reliability of fruit, so as in all directions, more complete and accurate simulation and research Flow Corrosion medium in elbow metal material
Corrosion behavior.
Exemplary description is done to the utility model above, it should explanation, do not departing from core of the present utility model
In the case of the heart, any simple deformation, modification or other skilled in the art can not spend creative work etc.
The scope of protection of the utility model is each fallen within replacing.
Claims (8)
- A kind of 1. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium, it is characterised in that including：With 90 ° of elbows pipeline structure snd size identical glass pipe (1) to be measured, the glass pipe (1) is horizontally disposed, the glass tube Road (1) is made up of 90 degree of crooked pipeline sections, first straight line duct section (S1) and second straight line duct section (S2), the first straight line Duct section (S1) is vertical with second straight line duct section (S2) and the first straight line duct section (S1) and second straight line duct section (S2) The port with 90 degree of crooked pipeline sections both ends connects respectively；3 spaced glass manifolds (4) are respectively communicated with the opposite sides of the first straight line duct section (S1), in institute The opposite sides for stating second straight line duct section (S2) has been respectively communicated with 2 spaced glass manifolds (4), positioned at described first The glass manifold (4) of rectilinear duct section (S1) and second straight line duct section (S2) opposite sides is respectively symmetrically set；Described 90 The side of degree crooked pipeline section is communicated with 3 spaced glass manifolds (4), and the opposite side relative with the side is communicated with N number of Glass manifold (4)；Wherein, the inside of the glass manifold (4) on the glass pipe (1) is used to insert 1 working electrode or 1 reference electricity Pole, the working electrode include：Metal cylinder and the polytetrafluoroethylene floor being packed in outside the cylinder periphery；The metal The material of cylinder is metal to be measured, and the metal cylinder is used to contact glass pipe (1) close to the end face of glass pipe (1) Interior corrosive medium, each end face are generally aligned in the same plane with closing on glass pipe (1) inwall of the end face；Described first Rectilinear duct section (S1) or second straight line duct section (S2) are set with the platinum of a tubular in the port away from 90 degree of crooked pipeline sections Net (3) is used as auxiliary electrode；3 glass manifolds (4) and N number of glass manifold (4) in 90 degree of crooked pipeline sections are curved positioned at described 90 degree respectively The inner curved outer wall and outer curved outer wall of bent duct section, the N=1, positioned at 90 degree of inner curved outer walls of crooked pipeline section Glass manifold (4) quantity be 1, positioned at 90 degree outer curved outer walls of crooked pipeline section glass manifold (4) quantity be 3, And positioned at 3 glass manifolds (4) of 90 degree of outer curved outer walls of crooked pipeline section since close to first straight line duct section (S1) The first branch pipe (4-1), the second branch pipe (4-2) and the 3rd branch pipe (4-3) are followed successively by, positioned at the glass manifold of inner curved outer wall (4) it is relative with the position of second branch pipe (4-2).
- 2. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 1, its It is characterised by, positioned at the inner curved outer wall of 90 degree of crooked pipeline sections and glass manifold (4) equal position of outer curved outer wall In 90 degree of crooked pipelines section institute in the plane.
- 3. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 2, its It is characterised by, positioned at the first straight line duct section (S1) and the glass manifold (4) of second straight line duct section (S2) opposite sides It is respectively perpendicular to the first straight line duct section (S1) or the second straight line duct section (S2) connected with the glass manifold (4).
- 4. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 3, its It is characterised by, is threaded into accordingly by this formed with screw thread, the working electrode on the outer peripheral face of the polytetrafluoroethylene floor Glass manifold (4) in.
- 5. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 4, its It is characterised by, the length of the platinum guaze (3) is 25~45mm；The external diameter of the glass manifold (4) is 15~30mm, internal diameter 9 ~26mm, length are 30~50mm.
- 6. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 5, its It is characterised by, the radius of the metal cylinder is 4~10mm.
- 7. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 6, its It is characterised by, a polytetrafluoroethylene (PTFE) screw joint (2) is separately installed with the port of the glass pipe (1) both sides.
- 8. 90 ° of elbow metal erosion electrochemical testing devices in p-type Flow Corrosion medium according to claim 7, its It is characterised by, metal joint is respectively connected with the working electrode, reference electrode and auxiliary electrode, and the reference electrode is full And calomel reference electrode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449730A (en) * | 2017-08-28 | 2017-12-08 | 天津大学 | 90 ° of elbow metal erosion electrochemical testing devices in a kind of Flow Corrosion medium |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
-
2017
- 2017-08-28 CN CN201721088586.7U patent/CN207181255U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449730A (en) * | 2017-08-28 | 2017-12-08 | 天津大学 | 90 ° of elbow metal erosion electrochemical testing devices in a kind of Flow Corrosion medium |
| CN107449730B (en) * | 2017-08-28 | 2023-08-25 | 天津大学 | Electrochemical testing device for corrosion of 90-degree elbow metal in flowing corrosive medium |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
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