CN109883942A - A kind of experimental method based on microscopical welding point microcell electro-chemical test - Google Patents
A kind of experimental method based on microscopical welding point microcell electro-chemical test Download PDFInfo
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- CN109883942A CN109883942A CN201910259536.8A CN201910259536A CN109883942A CN 109883942 A CN109883942 A CN 109883942A CN 201910259536 A CN201910259536 A CN 201910259536A CN 109883942 A CN109883942 A CN 109883942A
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Abstract
A kind of experimental method based on microscopical welding point microcell electro-chemical test, auxiliary electrode, reference electrode are connected using the object lens two sides of upright metallurgical microscope, lower section connects capillary, capillary lower contact working electrode (welding point), working electrode is placed on the glass panel of the objective table of upright metallurgical microscope, auxiliary electrode, reference electrode, working electrode are separately connected electrochemical workstation, and electrochemical workstation connects computer.When work, Nosepiece is rotated, is directed at welding point, brightness regulation knob is adjusted, so that the image brightness in eyepiece is moderate, limit handwheel is adjusted and focuses, so that working electrode surface energy blur-free imaging, mobile working electrode in eyepiece select a certain region of welding point to be measured.Nosepiece is rotated, so that capillary is directed at region to be measured, each connection is finished, test software is opened in computer, starts to test.The a certain region of Metal Material Welding connector is accurately positioned and is measured using this method, according to the demand of test area, the capillary of different tube diameters can be selected, realize the accurate measurement of welding point microcell electrochemical parameter.
Description
Technical field
The invention belongs to metal erosion Electrochemical Measurement Technology fields, and in particular to one kind is based on microscopical welding point
The experimental method of microcell electro-chemical test.
Background technique
Chemical action or the electrochemical action of material from environmental medium and rotten and the phenomenon that destroying, is known as corroding, corrosion is asked
Topic spread national economy and national defense construction each department, caused by harm it is startling.And compared with general corrosion, part is rotten
Although metallic material corrosion amount caused by erosion is less, its harmfulness is more serious, as spot corrosion can cause pipeline or container to be perforated
It scraps, stress corrosion then will lead to substantially reducing for component load-bearing ability.In addition, failure accidents caused by local corrosion often do not have
There are any sign, generally sudden destruction, it is difficult to predict, the control that local corrosion is destroyed is also more difficult.Therefore, in engineering
The accident as caused by local corrosion is more much more than general corrosion in practice.The survey showed that for all kinds of corrosion failure accidents,
General corrosion only accounts for about 20%, remaining about 80% for local corrosion destroy.In weld decay destruction, local corrosion phenomenon
Seem especially prominent.This is because the effect of Thermal Cycle, weld seam (WM), heat affected area (HAZ) and base material in welding point
(BM) ingredient and tissue there is certain difference, this species diversity can frequently result in welding point different zones corrosion resistance and
Mechanical property changes.And the corrosion proof difference of welding point different zones will lead to connector and use in corrosive environment
Shi Fasheng galvanic corrosion, this phenomenon make connector be easier to destroy.Based on the above reasons, researcher is to local corrosion
The research of mechanism, feature, influence factor and control technology give bigger concern.But use Conventional electrochemical test method
When the corrosion electrochemistry parameter measurement in each region of butt joint, need to take off each region of connector using the method for wire cutting, by
Size in Seam and heat effected zone is smaller, and the sample position of wire cutting is difficult accurately to guarantee.Meanwhile currently on the market about office
The Related product price of portion's corrosion rate test is higher, affects to Metal Material Welding connector microcell corrosion behavior and mechanism
Extensive research.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide one kind to be based on microscopical welding point
The experimental method of microcell electro-chemical test utilizes the microcell corrosion electrochemical action and mechanism of metal material under a kind of normal temperature and pressure
The experimental provision of research measures different metal material welding point microcell electrochemical parameter, accurately so as to clear gold
Belong to material welding point microcell corrosion behavior and mechanism, significantly reduce the cost of metal material microcell corrosion rate test,
It has broad application prospects in this research field.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of experimental method based on microscopical welding point microcell electro-chemical test, including upright metallurgical microscope,
The object lens two sides of upright metallurgical microscope connect auxiliary electrode, reference electrode, and lower section connects capillary, capillary lower contact work
Make electrode, working electrode is placed on the glass panel of the objective table of upright metallurgical microscope, auxiliary electrode, reference electrode, work
Electrode is separately connected electrochemical workstation, and electrochemical workstation connects computer, the experimental method of electro-chemical test include with
Lower step:
1) before testing, diameter capillary appropriate is selected according to Metal Material Welding connector different zones size；
2) agar gel prepared is injected into capillary bottom of the tube, slowly cools to solidification to agar gel, then will corrosion
Liquid (being prepared according to test request) is injected into capillary, and observation corrosion drop is in capillary bottom of the tube vertical hanging without falling
It falls；
3) capillary for being loaded into agar gel and corrosive liquid is fitted into the transparent vessel with auxiliary electrode and reference electrode,
Capillary and container junction are sealed with sealant, then container is installed on object lens mounting hole；
4) when testing, Nosepiece is rotated, registration coupon adjusts brightness regulation knob, so that the image brightness in eyepiece
It is moderate, it adjusts limit handwheel and focuses, so that working electrode surface energy blur-free imaging in eyepiece, mobile working electrode, choosing
Fixed region to be measured；
5) Nosepiece is rotated, so that capillary is directed at region to be measured, by auxiliary electrode, reference electrode and working electrode
It is connect with electrochemical workstation, and work station is connect with computer；
6) test software is opened in computer, starts to test.It can realize that sample is opened according to the function of electrochemical workstation
The test of road current potential and polarization curve.The upright metallurgical microscope is for being identified and being positioned to metal material microcell, together
When for three-electrode system provide installation site.
The auxiliary electrode, reference electrode and working electrode constitute three-electrode system, for metal material microcell into
The measurement of row electrochemical parameter.
The electrochemical workstation is used to acquire the electrochemical signals of auxiliary electrode, reference electrode and working electrode.
The computer is used to record the data of the external electrochemical workstation acquisition, analyzes processing and defeated
Out.
The agar gel is that 3% agar is added in saturation KCl solution.
The beneficial effects of the present invention are:
By metallographic microscope in conjunction with three-electrode system, test zone is accurately positioned and is measured.In addition, according to survey
The demand of area is tried, the capillary of different tube diameters can be selected, electrochemical measurement is carried out to material domain.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the open circuit potential figure in each region of welding point；
Fig. 3 is the polarization curve in each region of welding point.
Specific embodiment
The present invention is further discussed below below in conjunction with attached drawing.
As shown in Figure 1, a kind of experimental method based on microscopical welding point microcell electro-chemical test, including just set gold
Phase microscope, 17 two sides of object lens of upright metallurgical microscope connect auxiliary electrode 16, reference electrode 18, and lower section connects capillary
19,19 lower contact working electrode 20 of capillary, working electrode 20 is placed in the glass panel of the objective table 9 of upright metallurgical microscope
On 10, auxiliary electrode 16, reference electrode 18, working electrode 20 are separately connected electrochemical workstation 15, and electrochemical workstation 15 connects
Connect computer 14, the experimental method of electro-chemical test the following steps are included:
Before testing, diameter capillary appropriate is selected according to Metal Material Welding connector different zones size.It will
The agar gel prepared is injected into capillary bottom of the tube, slowly cools to solidification to agar gel, then corrosive liquid is injected into capillary
Capillary, without falling, is packed into band auxiliary electrode and reference electricity in capillary bottom of the tube vertical hanging by Guan Zhong, observation corrosion drop
In the transparent vessel of pole, capillary and container junction are sealed with sealant, then container is installed on object lens mounting hole.
When test, Nosepiece 8 is rotated, registration coupon adjusts brightness regulation knob 1, so that the image brightness in eyepiece 7
It is moderate, it adjusts limit handwheel 4 and focuses, so that 20 surface of working electrode energy blur-free imaging, mobile working electrode in eyepiece 7
20, select region to be measured.Nosepiece 8 is rotated, so that capillary 19 is directed at region to be measured, by auxiliary electrode 16, reference electricity
Pole 18 and working electrode 20 are connect with electrochemical workstation 15, and work station 15 is connect with computer 14.It is opened in computer 14
Test software starts to test.
On the basis of principles above analysis and related experiment, gained welding point is welded in simulation oil to A106B steel TIG
Field exports the electrochemical parameter of test splice different zones in liquid, as a result as shown in Figures 2 and 3.According to Fig. 3's as a result, utilizing
Origin software is fitted the data of polarization curve, and fitting formula is that can obtain the corrosion electric current density of sample shown in formula 1
icorr, anode Tafel slope baWith cathode Tafel slope bc, further according to Faraday's law (formula 2), it is each welding point can be calculated
The corrosion rate in region.
Note: in above formula, i is current density, that is, flows through metal electrode (working electrode) and between electrode (auxiliary electrode)
Current density, it be equal to anodic current density and cathode-current density difference；icorrIt is corrosion electric current density；Δ E=E-Ecorr
(E is the polarization potential being applied on metal electrode, EcorrFor open circuit potential), baFor anode Tafel slope, bcIt is luxuriant and rich with fragrance for cathode tower
That slope.
Note: in above formula, υcorrIt is corrosion rate (g/m2H), M is the gram-automic weight (g) of metal, and n is the valence of metal, F
For Faraday constant, icorrFor corrosion electric current density (μ A/cm2)。
Base side is equipped with brightness regulation knob 1, switch 2 below the upright metallurgical microscope, and base platform is equipped with
Optical collector 13 connects field stop 12 on optical collector 13；Upright metallurgical microscope support post side is equipped with limit handwheel 4, just
Face is equipped with objective table 9, and glass panel 10 is placed on objective table 9, and 9 lower section feed mechanism of objective table is equipped with condenser lifting knob
3, lower section connects condenser 11, and top is equipped with eyepiece 7；7 side of eyepiece is equipped with Amici prism push rod 5, observation/camera function is cut
Push rod 6 is changed, lower section is equipped with Nosepiece 8, connects object lens 17 below Nosepiece 8.
The upright metallurgical microscope is mentioned for metal material microcell to be identified and positioned for three-electrode system
For installation site.
The auxiliary electrode, reference electrode and working electrode constitute three-electrode system, for metal material microcell into
The measurement of row electrochemical parameter.
The electrochemical workstation is used to acquire the electrochemical signals of auxiliary electrode, reference electrode and working electrode.
The computer is used to record the data of the external electrochemical workstation acquisition, analyzes processing and defeated
Out.
Claims (5)
1. a kind of experimental method based on microscopical welding point microcell electro-chemical test, including upright metallurgical microscope, just
Object lens (17) two sides connection auxiliary electrode (16), reference electrode (18) of metallographic microscope are set, lower section connects capillary (19), hair
Tubule (19) lower contact working electrode (20), working electrode (20) are placed in the glass of the objective table (9) of upright metallurgical microscope
On panel (10), auxiliary electrode (16), reference electrode (18), working electrode (20) are separately connected electrochemical workstation (15), electricity
Chem workstation (15) connects computer (14), which is characterized in that the experimental method of its electro-chemical test the following steps are included:
1) before testing, diameter capillary appropriate is selected according to Metal Material Welding connector different zones size；
2) agar gel prepared is injected into capillary bottom of the tube, slowly cools to solidification to agar gel, then by corrosive liquid (root
Prepared according to test request) it is injected into capillary, observation corrosion drop is in capillary bottom of the tube vertical hanging without falling；
3) capillary for being loaded into agar gel and corrosive liquid is fitted into the transparent vessel with auxiliary electrode and reference electrode, and use is close
Capillary and container junction are sealed for sealing, then container is installed on object lens mounting hole；
4) when testing, Nosepiece is rotated, registration coupon adjusts brightness regulation knob, so that the image brightness in eyepiece is moderate,
It adjusts limit handwheel to focus, so that working electrode surface energy blur-free imaging, mobile working electrode in eyepiece are selected to be measured
Region；
5) Nosepiece is rotated, so that capillary is directed at region to be measured, by auxiliary electrode, reference electrode and working electrode and electricity
Chem workstation connection, and work station is connect with computer；
6) test software is opened in computer, starts electro-chemical test.
2. a kind of experimental method based on microscopical welding point microcell electro-chemical test according to claim 1,
It is characterized in that, the upright metallurgical microscope is three-electrode system for metal material microcell to be identified and positioned
Installation site is provided.
3. a kind of experimental method based on microscopical welding point microcell electro-chemical test according to claim 1,
Be characterized in that, the auxiliary electrode, reference electrode and working electrode constitute three-electrode system, for metal material microcell into
The measurement of row electrochemical parameter.
4. a kind of experimental method based on microscopical welding point microcell electro-chemical test according to claim 1,
It is characterized in that, the electrochemical workstation is used to acquire the electrochemical signals of auxiliary electrode, reference electrode and working electrode.
5. a kind of experimental method based on microscopical welding point microcell electro-chemical test according to claim 1,
Be characterized in that, the computer is used to record the data of the external electrochemical workstation acquisition, analyze processing and
Output.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514720A (en) * | 2019-07-15 | 2019-11-29 | 江苏大学 | Device and measurement method based on microcapillary cell research fretting corrosion performance |
| CN110987783A (en) * | 2019-11-22 | 2020-04-10 | 北京科技大学 | Method and device for fine evaluation of local corrosion/pitting corrosion of metal and alloy |
| CN111638177A (en) * | 2020-06-12 | 2020-09-08 | 东风汽车集团有限公司 | Filamentous microelectrode and correction method and application thereof to electrochemical corrosion rate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424583A (en) * | 2015-11-06 | 2016-03-23 | 南京钢铁股份有限公司 | Method for evaluating corrosion resistance of welded joint based on potential testing technology |
| CN107831108A (en) * | 2017-11-24 | 2018-03-23 | 北京科技大学 | A kind of electrochemical test method and device based on automatic film covering Yu micro- liquid pool |
| CN108645783A (en) * | 2018-08-20 | 2018-10-12 | 南京钢铁股份有限公司 | A kind of microcell electrochemical testing device and its test method |
| CN208420649U (en) * | 2018-08-06 | 2019-01-22 | 西安石油大学 | A kind of microcell electro-chemical test experimental provision |
-
2019
- 2019-04-02 CN CN201910259536.8A patent/CN109883942A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424583A (en) * | 2015-11-06 | 2016-03-23 | 南京钢铁股份有限公司 | Method for evaluating corrosion resistance of welded joint based on potential testing technology |
| CN107831108A (en) * | 2017-11-24 | 2018-03-23 | 北京科技大学 | A kind of electrochemical test method and device based on automatic film covering Yu micro- liquid pool |
| CN208420649U (en) * | 2018-08-06 | 2019-01-22 | 西安石油大学 | A kind of microcell electro-chemical test experimental provision |
| CN108645783A (en) * | 2018-08-20 | 2018-10-12 | 南京钢铁股份有限公司 | A kind of microcell electrochemical testing device and its test method |
Non-Patent Citations (1)
| Title |
|---|
| 陈鹤鸣 等: "《核反应堆材料腐蚀及其防护》", 30 November 1984 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514720A (en) * | 2019-07-15 | 2019-11-29 | 江苏大学 | Device and measurement method based on microcapillary cell research fretting corrosion performance |
| CN110514720B (en) * | 2019-07-15 | 2022-02-15 | 江苏大学 | Device and measuring method for researching frictional corrosion performance based on microcapillary cells |
| CN110987783A (en) * | 2019-11-22 | 2020-04-10 | 北京科技大学 | Method and device for fine evaluation of local corrosion/pitting corrosion of metal and alloy |
| CN111638177A (en) * | 2020-06-12 | 2020-09-08 | 东风汽车集团有限公司 | Filamentous microelectrode and correction method and application thereof to electrochemical corrosion rate |
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Application publication date: 20190614 |