CN204255822U - A kind of nickel-base alloy pitting resistance evaluating apparatus - Google Patents
A kind of nickel-base alloy pitting resistance evaluating apparatus Download PDFInfo
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- CN204255822U CN204255822U CN201420517516.9U CN201420517516U CN204255822U CN 204255822 U CN204255822 U CN 204255822U CN 201420517516 U CN201420517516 U CN 201420517516U CN 204255822 U CN204255822 U CN 204255822U
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Abstract
The utility model discloses a kind of nickel-base alloy pitting resistance evaluating apparatus, comprise electrochemical workstation (1), electrolytic tank (2), temperature monitoring system (5), contrast electrode (6), data terminal (7) and recirculated water (4) composition, it is characterized in that: electrochemical workstation (1) is communicated with electrolytic tank (2) with contrast electrode (6), temperature monitoring system (5) is communicated with data terminal (7) with electrolytic tank (2), circulating water pipe (4) is communicated with electrolytic tank (2), this device measures nickel-base alloy pitting resistance, convenient and swift, accurately.
Description
Technical field
The utility model belongs to metal erosion assessment technique field, more particularly relates to a kind of evaluating apparatus of nickel-base alloy pitting resistance.
Background technology
Spot corrosion is the hidden and destructive great form of partial corrosion of a kind of outward appearance, is one of major reason causing easy passive metal or the impaired inefficacy of alloy.Nickel-base alloy is a kind of high corrosion resistant aluminium alloy mainly containing the element compositions such as nickel, copper, chromium, molybdenum, under the environment of strong oxidizing property or reductibility, all there is stronger corrosion resistance, be widely used for manufacturing parts and set of equipments under the various anti-corrosion environment such as oil, chemical industry, electric power, nuclear industry.Nickel-base alloy is on active service usually under relatively rugged environment, and the therefore corrosion stability of nickel-base alloy under severe rugged environment, especially pitting resistance causes the very big concern of people.Although spot corrosion loss metal quality little, but the geometric shape due to spot corrosion makes it form the structure of large negative electrode/primary anode, the anodic solution speed causing erosion empty is quite large, the generating process of spot corrosion simultaneously has the advantages that automatically accelerate, thus cause e-quipment and pipe generation corrosion failure, cause device security problem, therefore, any nickel-base alloy of mensuration accurately pitting resistance is the key of proper use of nickel-base alloy.
The conventional easy passive metal of evaluation or the method for alloy pitting resistance are electrochemical method is that GB/T17899-1999 " stainless steel pitting potential measuring method " adopts potentiodynamic technique to measure the method for stainless steel pitting potential; ASTM G150-2010 " the galvanochemistry standard test method of stainless steel critical pitting temperature " adopts constant potential critical pitting temperature method to measure pitting resistance of stainless steel.Patent CN101762449A discloses a kind of Pulse Width Control and evaluates the electrochemical method of stainless steel spot corrosion generation and development; CN101294888A discloses a kind of method utilizing galvanochemistry metastable state current fluctuation effect to determine preferred generating phase section of biphase stainless steel corrosive pitting.Above-mentioned evaluation method is mainly for the pitting resistance evaluation of stainless steel material, as austenitic stainless steel, ferritic stainless steel, two phase stainless steel etc. have good applicability and repeatability, but due to the difference of material capability, adopt said method to test nickel-bass alloy material, can not meet the demands.And adopt absolute critical pitting temperatures to instruct the application of nickel-base alloy in actual pitting environments too conservative, therefore need to develop the evaluating apparatus of the nickel-base alloy pitting resistance being more suitable for actual pitting environments.
Utility model content
The purpose of this utility model is to provide a kind of nickel-base alloy pitting resistance evaluating apparatus, instructs the application of nickel-base alloy in pitting environments.
A kind of nickel-base alloy pitting resistance evaluating apparatus, comprise electrochemical workstation 1, electrolytic tank 2, temperature monitoring system 5, contrast electrode 6, data terminal 7 and circulating water pipe 4 to form, it is characterized in that: electrochemical workstation 1 is communicated with electrolytic tank 2 with contrast electrode 6, temperature monitoring system 5 is communicated with data terminal 7 with electrolytic tank 2, and circulating water pipe 4 is communicated with electrolytic tank 2.
Described circulating water pipe 4 is communicated with electrolytic tank 2 interlayer.
Described electrolytic tank 2 is provided with snorkel 9, and is communicated with snorkel 9.
Described electrolytic tank 2 is provided with auxiliary electrode 8, contrast electrode salt bridge 10, condenser 11 and thermocouple sheath 12.
Described a kind of nickel-base alloy pitting resistance evaluating apparatus, also comprise thermocouple sheath 12, thermocouple sheath 12 is communicated with temperature monitoring system 5 by thermopair.
A kind of nickel-base alloy pitting resistance evaluating apparatus is also provided with water filling device 3, and water filling device 3 is communicated with electrolytic tank 2.
Described water filling device 3 is communicated with electrolytic tank 2 bottom inlet.
Utilize a kind of nickel-base alloy pitting resistance of the utility model evaluating apparatus, nickel-base alloy is made one side area and be greater than 2 ~ 15cm
2square or round sheet sample, polish, use acetone and washes of absolute alcohol, put into the NaCl solution electrolytic tank containing 50ppm ~ saturation concentration after drying up, electrolyte solution is stabilized in 5 ~ 95 DEG C, and the volume of solution is not less than 200ml/cm with the ratio of sample working area
2simultaneously in electrolytic tank with 2 ~ 10ml/h, optimum is 4 ~ 6ml/h, injection distilled water and 0.2 ~ 1.0L/min often rise electrolyte solution, optimum is that 0.3 ~ 0.7L/min often rises electrolyte solution and passes into nitrogen, regulating electrolytic tank solution temperature measures the temperature variant turning point of Eb100, Eb100 very absolute critical pitting temperatures.
Eb100 is corresponding current density 100 μ A/cm in polarization curve
2current potential in positive potential maximal value.Compared with prior art, adopt the evaluating apparatus of a kind of nickel-base alloy pitting resistance of the present invention to measure nickel-base alloy pitting resistance, convenient and swift, data are reliable, absolute critical pitting temperatures and relative critical pitting temperatures, effectively can instruct the application of nickel-base alloy in actual production.
Utilize spot corrosion test complete equipment involved in the present invention, the polarization curve that under recording particular etch media environment, each temperature is corresponding, and get Eb100 value curve plotting corresponding to each temperature, temperature corresponding during Eb100 value mutation is absolute critical pitting temperatures, and the temperature value being greater than absolute critical pitting temperatures is the critical pitting temperature relative to its corresponding current potential.Adopt this device and matching method to carry out nickel-base alloy pitting resistance test experiments convenient and swift, obtained experimental data is true and reliable.Absolute critical pitting temperatures and relative critical pitting temperatures data, in conjunction with the real working condition in actual production, effectively can instruct the application of nickel-base alloy in actual production.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of nickel-base alloy pitting resistance of the utility model evaluating apparatus structural drawing.
Accompanying drawing 2 is a kind of nickel-base alloy pitting resistance of the utility model evaluating apparatus electrolyser construction figure.
Wherein: 1. electrochemical workstation, 2. electrolytic tank, 3. water filling device follows, 4. circulating water pipe, 5. temperature monitoring system, 6. contrast electrode, 7. data terminal, 8. auxiliary electrode, 9. snorkel, 10. contrast electrode salt bridge, 11. condensers, 12. thermocouple sheaths, 21 test pieces, 22. filter paper circles, 23. rubber rings, 24. resin washer, 25. waterflood paths, 26. metallic gaskets, 27. working electrode extension bars, 28. glass cavitys, 29. auxiliary electrodes, 30. snorkels, 31. salt bridges, 32. condenser interfaces, 33. thermocouple sheaths, 34. rubber washers, 35. upper cover plates; 36. corrosive mediums, 37. lower covers, 38. auxiliary connection board, 39. screw rods and nut.
Embodiment
Utilize embodiment that a kind of nickel-base alloy pitting resistance of the present invention evaluation method is described below, but do not limit scope of invention.
A kind of nickel-base alloy pitting resistance evaluating apparatus, comprise electrochemical workstation 1, electrolytic tank 2, temperature monitoring system 5, contrast electrode 6, data terminal 7 and circulating water pipe 4 form, it is characterized in that: electrochemical workstation 1 is communicated with electrolytic tank 2 with contrast electrode 6, temperature monitoring system 5 is communicated with data terminal 7 with electrolytic tank 2, circulating water pipe 4 is communicated with electrolytic tank 2 interlayer, electrolytic tank 2 is provided with snorkel 9, and be communicated with snorkel 9, electrolytic tank 2 is provided with auxiliary electrode 8, contrast electrode salt bridge 10, condenser 11 and thermocouple sheath 12, thermowell 12 is communicated with temperature monitoring system 5 by thermopair, a kind of nickel-base alloy pitting resistance evaluating apparatus is also provided with water filling device 3, water filling device 3 is communicated with electrolytic tank 2 bottom inlet.
Nickel-base alloy is made one side area and be greater than 2cm
2square coupons, polish, use acetone and washes of absolute alcohol, the NaCl solution electrolytic tank containing 10000ppm concentration is put in the test piece after drying up, and the volume of solution is 250ml/cm with the ratio of sample working area
2, simultaneously in electrolytic tank with 5ml/h, inject distilled water and 0.1L/min passes into nitrogen, regulating electrolytic tank solution temperature measures the temperature variant turning point of Eb100, Eb100, and to be absolute critical pitting temperatures be 53 DEG C.
Claims (6)
1. a nickel-base alloy pitting resistance evaluating apparatus, comprise electrochemical workstation (1), electrolytic tank (2), temperature monitoring system (5), contrast electrode (6), data terminal (7) and circulating water pipe (4) composition, it is characterized in that: electrochemical workstation (1) is communicated with electrolytic tank (2) with contrast electrode (6), temperature monitoring system (5) is communicated with data terminal (7) with electrolytic tank (2), and circulating water pipe (4) is communicated with electrolytic tank (2) interlayer.
2. according to a kind of nickel-base alloy pitting resistance evaluating apparatus according to claim 1, it is characterized in that: described electrolytic tank (2) is provided with snorkel (9), and is communicated with snorkel (9).
3. according to a kind of nickel-base alloy pitting resistance evaluating apparatus according to claim 1, it is characterized in that: described electrolytic tank (2) is provided with auxiliary electrode (8), contrast electrode salt bridge (10), condenser (11) and thermocouple sheath (12).
4., according to a kind of nickel-base alloy pitting resistance evaluating apparatus according to claim 1, it is characterized in that: also comprise thermocouple sheath (12), thermocouple sheath (12) is communicated with temperature monitoring system (5) by thermopair.
5. according to a kind of nickel-base alloy pitting resistance evaluating apparatus according to claim 1, it is characterized in that: a kind of nickel-base alloy pitting resistance evaluating apparatus is also provided with water filling device (3), and water filling device (3) is communicated with electrolytic tank (2).
6. according to a kind of nickel-base alloy pitting resistance evaluating apparatus according to claim 5, it is characterized in that: described water filling device (3) is communicated with electrolytic tank (2) bottom inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517516.9U CN204255822U (en) | 2014-09-03 | 2014-09-03 | A kind of nickel-base alloy pitting resistance evaluating apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420517516.9U CN204255822U (en) | 2014-09-03 | 2014-09-03 | A kind of nickel-base alloy pitting resistance evaluating apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784803A (en) * | 2016-03-07 | 2016-07-20 | 杨雁泽 | Clamp used for measuring stainless steel pipe outer surface critical point corrosion temperature |
| CN110261296A (en) * | 2019-07-08 | 2019-09-20 | 北华航天工业学院 | A kind of spot corrosion simulation test device and method |
| CN110274808A (en) * | 2019-07-05 | 2019-09-24 | 北华航天工业学院 | A kind of detection method of stainless steel point borrosion hole inside corrosion product concentration |
| 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 |
-
2014
- 2014-09-03 CN CN201420517516.9U patent/CN204255822U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784803A (en) * | 2016-03-07 | 2016-07-20 | 杨雁泽 | Clamp used for measuring stainless steel pipe outer surface critical point corrosion temperature |
| CN105784803B (en) * | 2016-03-07 | 2018-04-03 | 杨雁泽 | A kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature |
| CN110274808A (en) * | 2019-07-05 | 2019-09-24 | 北华航天工业学院 | A kind of detection method of stainless steel point borrosion hole inside corrosion product concentration |
| CN110261296A (en) * | 2019-07-08 | 2019-09-20 | 北华航天工业学院 | A kind of spot corrosion simulation test device and method |
| 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 |
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