CN102937569A - Stress corrosion test apparatus - Google Patents
Stress corrosion test apparatus Download PDFInfo
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- CN102937569A CN102937569A CN2011104433751A CN201110443375A CN102937569A CN 102937569 A CN102937569 A CN 102937569A CN 2011104433751 A CN2011104433751 A CN 2011104433751A CN 201110443375 A CN201110443375 A CN 201110443375A CN 102937569 A CN102937569 A CN 102937569A
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Abstract
The invention discloses a stress corrosion test apparatus. The apparatus comprises a stress corrosion container (1), a spherical condenser (2), a tensile test specimen (3), a salt bridge 1 (4), a wide-mouth bottle (5), a salt bridge 2 (6), a reference electrode (7), a platinum electrode, a computer (8), an electrochemical workstation (9), a electric stove wire (10), a thermoelectric thermometer (11), a temperature controller (12), an alternating-current transformer (13), etc. The apparatus can provide tensile tests capable of being used for metals in a corrosive medium with controllable temperature and capable of being externally applied corrosion current. The temperature of the corrosion medium is controlled by the electric stove wire and a temperature-control system. The reference electrode, the platinum electrode and the tensile test specimen constitute a voltage circuit and a current circuit respectively to control the corrosion potential and current additionally applied on the test specimen or generated on a monitoring sample. A normal temperature reference electrode rather than a high temperature reference electrode can be used for the measurement of the potential by connecting the reference electrode, the wide-mouth bottle and the stress corrosion container with the salt bridges.
Description
Technical field
The present invention relates to a kind of stress corrosion testing device, belong to the improvement technology of tensile stress etching apparatus.
Background technology
In metal corrosion test, stress corrosion (cracking) test is an important content, the stress corrosion (cracking) test method has multiple, in " GB/T 15970.7-2000 metal and alloy corrosion stress corrosion (cracking) test ", " stress corrosion (cracking) test in the fluidizing chlorination magnesium solution of GB/T 17898-1999 stainless steel ", the stress corrosion (cracking) test method has been described, wherein have advantages of can the Fast Evaluation scc sensitivity for the slow strain rate test method, in these two national standard test methods, can heat corrosive medium, but can not add and detect current potential, electric current.
Commonly use three-electrode system in the electro-chemical test at present, comprise working electrode (sample), contrast electrode (mercurous chloride electrode, silver chloride electrode, copper sulfate eletrode etc. are commonly used in the laboratory), auxiliary electrode (platinum electrode, graphite electrode etc. are commonly used in the laboratory), medium in these contrast electrodes all is aqueous solution, be applicable to test the current potential under the normal temperature, and it is few to be applicable to measure the contrast electrode kind that is higher than 50 ℃ of occasions, need customized, expensive, fragile and serviceable life is short.
Summary of the invention
Because the corrosion resisting property to the performance of material especially metal material requires more and more higher, newly the metal material of development often can not be estimated out the quality of corrosion resisting property comparatively fast, more effectively with former test method, thereby can't instruct research and development and selection, need to make the test condition harshness just can draw anti-corrosion result.Slow-drawing stress corrosion test device originally only has stretching and heats; and there are not externally-applied potential, electric current and temperature regulating device; externally-applied potential or current analog be to strengthen the rate of metal corrosion be in the stress corrosion state; or simulate the metal that is in the stress corrosion state that adds cathodic protection, have practical significance.And temperature is very large on the corrosion speed impact, so will control medium temperature.
To be solved by this invention is the temperature that adds and measure current potential, electric current and control corrosive medium.
For solution adds and measures the sample potential problem, particularly measure the problem that is higher than 50 ℃ of medium current potentials, the present invention does not directly use conventional contrast electrode, without high temp. reference electrode, but adopts two salt Biodge devices yet.Salt bridge 1(4) be the glass tube of a hollow, right-hand member is made Luggin capillary, and left end is 90-degree bent left, and there is T-valve the centre.Salt bridge 2(6) is the glass tube that there is the diafiltration pottery lower end.Contrast electrode (7) inserts salt bridge 2(6) in.By salt bridge 1(4), wide-necked bottle (5), salt bridge 2(6) and contrast electrode (7), receive contrast electrode (7) and be added in current potential on the sample or the test samples current potential by the RE interface of electrochemical workstation (9).Make conventional contrast electrode (7) not with stress corrosion container (1) in the high corrosive medium of temperature directly contact, and can normally use, avoided in stress corrosion container (1), inserting the problem of conventional contrast electrode or high temp. reference electrode appearance.
Add and measure the problem of specimen current for solution, the present invention is in the upper perforate of stress corrosion container (1) and insert platinum electrode, is connected on the ce interface of electrochemical workstation (9), with control or detection electric current.
For solving the problem to the corrosive medium temperature control, the present invention inserts thermocouple thermometer (11) in the upper perforate of stress corrosion container (1), and thermocouple thermometer (11) links to each other with temperature controller (12).With the heating of the electric furnace heating wire (10) in the control Ω shape heating ring whether to set required test temperature with temperature controller (12), and regulate the intensity that electric furnace heating wire (10) heats with AC transformer (13).Simultaneously, the steam that produces with ball condenser (2) condensation heating corrosive medium is avoided producing the corrosive medium concentration phenomena because of heating.
The invention has the beneficial effects as follows: can enough common normal temperature contrast electrodes in the higher temperature corrosive medium of (being higher than 50 ℃) to stress corrosion sample externally-applied potential and test samples current potential, available platinum electrode counter stress corrosion sample impressed current and test samples electric current can be controlled easily the temperature of corrosive medium and regulate the speed that heats.
Description of drawings
Below by embodiment also by reference to the accompanying drawings, the present invention is described in further detail:
Fig. 1 is test unit sectional view of the present invention;
Fig. 2 is the layout suitable for reading of stress corrosion container (1) among the test unit figure of the present invention;
Fig. 3 is the interior Ω shape of stress corrosion container (1) heating ring figure (A-A sectional view among Fig. 1) among the test unit figure of the present invention;
Fig. 4 is electric current and current potential loading and detecting instrument schematic diagram among the present invention;
Fig. 5 is heating and temperature control schematic diagram among the present invention.
Embodiment
Shown in Fig. 1 stress corrosion testing device sectional view, this stress corrosion testing device comprises stress corrosion container (1), ball condenser (2), tensile sample (3), salt bridge 1(4), wide-necked bottle (5), salt bridge 2(6), contrast electrode (7), platinum electrode, computing machine (8), electrochemical workstation (9), electric furnace heating wire (10), thermocouple thermometer (11), temperature controller (12), AC transformer (13) etc.
Stress corrosion container (1) is made with pyroceram, 6 holes are arranged, hole 1 and hole 2 are used for passing sample, the hole 3 shape condenser (2) of receiving, hole 4～6 meets platinum electrode, salt bridge 1(4), thermocouple thermometer (11), rubber stopper seal is all used in hole 1～2, hole 4～6, prevent steam from revealing and the concentration of change corrosive medium, when sample was elongated, sample kept relative static with the rubber plug in hole 2, and sample slides in the rubber plug in hole 1.Ω shape heating ring is arranged in the stress corrosion container (1), penetrate electric furnace heating wire, be used for heating to corrosive medium.
Ball condenser (2) passes into chilled water at the trial, is used for cooling owing to the water vapor that the heating corrosive medium produces, and the concentration of corrosive medium can not changed in process of the test.
Tensile sample (3) is determined size for the standard tensile batten or according to actual conditions, and two termination slow strain rate tension equipment clamp head are drawn wire power connection chem workstation (9) simultaneously.
Salt bridge 1(4) Luggin capillary inserts in the stress corrosion container (1), the most advanced and sophisticated sample that points to, distance is 2mm approximately, to reduce tensile sample (3) to the solution voltage drop between the Luggin capillary tip, left end left 90-degree bent makes opening and salt bridge 2(6) relative, reduce the solution voltage drop, improve test accuracy.The middle T-valve of use makes things convenient for corrosive medium is sucked salt bridge 1(4) and without bubble, make salt bridge 1(4) in be full of corrosive medium, the corrosive medium of packing in the wide-necked bottle (5).Salt bridge 2(6) there is the diafiltration pottery lower end, at salt bridge 2(6) in add with contrast electrode in identical solution, insertion contrast electrode suitable for reading (7), make contrast electrode (7) and salt bridge 2(6) between the solution without bubble, salt bridge 2(6) with the O-ring seal sealing, make salt bridge 2(6 by negative pressure and between the contrast electrode (7)) in solution can not leak in the wide-necked bottle (5).Contrast electrode (7) is connect electrochemical workstation (9) with control or detects current potential.
Insert platinum electrode in stress corrosion container (1), platinum electrode links to each other with electrochemical workstation (9), with control or detection electric current.
In stress corrosion container (1), insert thermocouple thermometer (11), temperature controller (12) is set the temperature that needs, the break-make of control electric furnace heating wire (10) heating is with the intensity of AC transformer (13) control electric furnace heating wire (10) heating, to reach the purpose of temperature control.
Before carrying out stress corrosion (cracking) test, according to the each several part that connects shown in Figure 1, the sample two ends are fixed on the slow strain rate test machine, set the test temperature that needs by temperature controller, contrast electrode, platinum electrode, tensile sample are connected on the electrochemical workstation, begin heating, when reaching required test temperature, begin to add current potential, electric current, carry out again stress corrosion (cracking) test.If need not to add and measure current potential or electric current, can not add salt bridge, contrast electrode, platinum electrode, wide-necked bottle, if need not heating and temperature control, can not add electric furnace heating wire, thermocouple thermometer, temperature controller, AC transformer, corresponding stopple is lived convenient different testing requirements with rubber plug.
Claims (9)
1. a stress corrosion testing device comprises stress corrosion container (1), ball condenser (2), tensile sample (3), salt bridge 1(4), wide-necked bottle (5), salt bridge 2(6), contrast electrode (7), platinum electrode, computing machine (8), electrochemical workstation (9), electric furnace heating wire (10), thermocouple thermometer (11), temperature controller (12), AC transformer (13).
2. stress corrosion device according to claim 1, it is characterized in that: stress corrosion container (1) is made with pyroceram; 6 holes are arranged on the stress corrosion container (1), and hole 1 and hole 2 is used for passing tensile sample (3), the hole 3 shape condenser (2) of receiving, and hole 4～6 connects platinum electrode, salt bridge 1, thermocouple thermometer, and Ω shape heating ring is arranged in the stress corrosion container (1).
3. stress corrosion device according to claim 1, it is characterized in that: be hollow salt bridge 1(4), the right side is Luggin capillary, there is a T-valve at the middle part; Salt bridge 2(6) is the glass tube that there is the diafiltration pottery lower end.
4. described stress corrosion device according to claim 1～3, it is characterized in that: contrast electrode (7) is by salt bridge 2(6), wide-necked bottle (5), salt bridge 1(4) form voltage circuit with tensile sample (3), be added to polarizing voltage on the sample with the corrosion potential that produces on the monitoring sample or control.
5. described stress corrosion device according to claim 1～3 is characterized in that: platinum electrode and tensile sample (3) form current return, are added to the corrosion current that produces on electric current on the sample or the monitoring sample with control.
6. described stress corrosion device according to claim 1～3, it is characterized in that: by contrast electrode (7), salt bridge 2(6), wide-necked bottle (5), salt bridge 1(4), the connection of stress corrosion container (1), make to apply and control or monitor potential value and can need not to use high temp. reference electrode with the normal temperature contrast electrode.
7. described stress corrosion device is characterized in that: use electric furnace heating wire (10) and AC transformer (13) to heat the interior corrosive medium of stress corrosion container (1), and control the speed of heating according to claim 1～3.
8. described stress corrosion device is characterized in that: control the break-make of electric furnace heating wire (10) heating by thermocouple thermometer (11), temperature controller (12), thereby make the temperature stabilization of corrosive medium in the temperature of setting according to claim 1～3.
9. described stress corrosion device is characterized in that: use ball condenser (2) condensation owing to adding thermogenetic steam, avoid producing the corrosive medium concentration phenomena because of heating according to claim 1～3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104433751A CN102937569A (en) | 2011-12-27 | 2011-12-27 | Stress corrosion test apparatus |
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| CN2011104433751A CN102937569A (en) | 2011-12-27 | 2011-12-27 | Stress corrosion test apparatus |
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| CN102937569A true CN102937569A (en) | 2013-02-20 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411878A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | Method for stray current corrosion test of buried steel pipeline under tensile stress action |
| CN104056892A (en) * | 2013-03-18 | 2014-09-24 | 天津大学 | Stretching machining method for improving corrosion resistance of metal products |
| CN104251798A (en) * | 2013-06-26 | 2014-12-31 | 宝山钢铁股份有限公司 | High-strength bolt delayed fracture test method and apparatus thereof |
| CN105136651A (en) * | 2015-08-18 | 2015-12-09 | 无锡乐华自动化科技有限公司 | Metal sheet-based wet-heat resistant property automatic detecting method |
| CN106153530A (en) * | 2015-03-23 | 2016-11-23 | 上海宝钢工业技术服务有限公司 | Tin plate decay resistance detecting system and method |
| CN107727792A (en) * | 2017-11-01 | 2018-02-23 | 青岛顺昕电子科技有限公司 | A kind of permanganate index analyzer and permanganate index analysis method |
| CN108166001A (en) * | 2018-01-18 | 2018-06-15 | 中国船舶重工集团公司第七二五研究所 | Material cathode protection tester and method under a kind of slow tensional state |
| CN111366527A (en) * | 2020-04-01 | 2020-07-03 | 大连理工大学 | Multichannel corrosion monitoring system suitable for researching stress corrosion of metal material |
| CN113237827A (en) * | 2021-06-25 | 2021-08-10 | 清华大学 | Electrochemical test system for molten salt corrosion experiment |
| CN113933366A (en) * | 2021-08-26 | 2022-01-14 | 上海空间电源研究所 | Electrochemical testing device for bipolar plate of fuel cell |
| CN113945509A (en) * | 2021-11-01 | 2022-01-18 | 西安稀有金属材料研究院有限公司 | Device and method for performing electrochemical test in high-temperature liquid-phase corrosion environment |
| CN114264567A (en) * | 2022-01-05 | 2022-04-01 | 中国人民解放军陆军装甲兵学院 | Test safety monitoring system |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104056892A (en) * | 2013-03-18 | 2014-09-24 | 天津大学 | Stretching machining method for improving corrosion resistance of metal products |
| CN104056892B (en) * | 2013-03-18 | 2016-08-24 | 天津大学 | A kind of stretch process method improving metallic article corrosion resistance |
| CN104251798A (en) * | 2013-06-26 | 2014-12-31 | 宝山钢铁股份有限公司 | High-strength bolt delayed fracture test method and apparatus thereof |
| CN103411878A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | Method for stray current corrosion test of buried steel pipeline under tensile stress action |
| CN103411878B (en) * | 2013-07-13 | 2015-07-01 | 北京工业大学 | Method for stray current corrosion test of buried steel pipeline under tensile stress action |
| CN106153530A (en) * | 2015-03-23 | 2016-11-23 | 上海宝钢工业技术服务有限公司 | Tin plate decay resistance detecting system and method |
| CN105136651A (en) * | 2015-08-18 | 2015-12-09 | 无锡乐华自动化科技有限公司 | Metal sheet-based wet-heat resistant property automatic detecting method |
| CN105136651B (en) * | 2015-08-18 | 2017-12-01 | 重庆硕奥科技有限公司 | A kind of wet-hot aging performance automatic testing method based on sheet metal |
| CN107727792A (en) * | 2017-11-01 | 2018-02-23 | 青岛顺昕电子科技有限公司 | A kind of permanganate index analyzer and permanganate index analysis method |
| CN108166001A (en) * | 2018-01-18 | 2018-06-15 | 中国船舶重工集团公司第七二五研究所 | Material cathode protection tester and method under a kind of slow tensional state |
| CN108166001B (en) * | 2018-01-18 | 2020-02-18 | 中国船舶重工集团公司第七二五研究所 | Material cathode protection testing device and method in slow stretching state |
| CN111366527A (en) * | 2020-04-01 | 2020-07-03 | 大连理工大学 | Multichannel corrosion monitoring system suitable for researching stress corrosion of metal material |
| CN111366527B (en) * | 2020-04-01 | 2021-10-08 | 大连理工大学 | Multichannel corrosion monitoring system suitable for researching stress corrosion of metal material |
| CN113237827A (en) * | 2021-06-25 | 2021-08-10 | 清华大学 | Electrochemical test system for molten salt corrosion experiment |
| CN113933366A (en) * | 2021-08-26 | 2022-01-14 | 上海空间电源研究所 | Electrochemical testing device for bipolar plate of fuel cell |
| CN113945509A (en) * | 2021-11-01 | 2022-01-18 | 西安稀有金属材料研究院有限公司 | Device and method for performing electrochemical test in high-temperature liquid-phase corrosion environment |
| CN114264567A (en) * | 2022-01-05 | 2022-04-01 | 中国人民解放军陆军装甲兵学院 | Test safety monitoring system |
| CN114264567B (en) * | 2022-01-05 | 2024-03-08 | 中国人民解放军陆军装甲兵学院 | Test safety monitoring system |
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Application publication date: 20130220 |