CN113720754A - Instrument for stainless steel copper sulfate intergranular corrosion test and use method - Google Patents
Instrument for stainless steel copper sulfate intergranular corrosion test and use method Download PDFInfo
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- CN113720754A CN113720754A CN202110941245.4A CN202110941245A CN113720754A CN 113720754 A CN113720754 A CN 113720754A CN 202110941245 A CN202110941245 A CN 202110941245A CN 113720754 A CN113720754 A CN 113720754A
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Abstract
The invention discloses an instrument for stainless steel copper sulfate intergranular corrosion test and a using method thereof, wherein the instrument comprises: grinding the bottle; the bottom end of the condenser is matched with the bottle mouth of the ground bottle; the condenser comprises a condensation straight pipe and a condensation pipe arranged in the condensation straight pipe, and condensate is filled between the inner wall of the condensation straight pipe and the outer wall of the condensation pipe; the condensation pipe comprises a condensation ball pipe and a serpentine coil pipe, wherein the air inlet end of the condensation ball pipe is provided with an air inlet, the air inlet extends out of the bottom end of the condensation straight pipe and extends into the bottle mouth of the ground bottle, the air outlet end of the condensation ball pipe is communicated with the air inlet end of the serpentine coil pipe, the air outlet end of the serpentine coil pipe is provided with an air outlet pipe, the air outlet pipe is communicated with the air outlet at the top end of the condensation straight pipe, and the joint of the condensation straight pipe and the air outlet is sealed through a spherical seal head. The method can meet the standard requirement of the intergranular corrosion of the copper sulfate, carry out the intergranular corrosion test operation, and ensure the accuracy, the reliability and the effectiveness of the intergranular corrosion test.
Description
Technical Field
The invention relates to the technical field of intercrystalline corrosion tests, in particular to an instrument for a stainless steel copper sulfate intercrystalline corrosion test and a using method thereof.
Background
Austenitic stainless steels of the 18-8 type have high chemical stability in many media, but are susceptible to intergranular corrosion in certain corrosive media after heating in the range of 400-800 ℃ or slow cooling in this temperature range. Intergranular corrosion is characterized by etching along grain boundaries. The metal loses its mechanical properties, rendering the entire metal powder. In order to consider the intergranular corrosion resistance of a material in a particular environment, the material can be evaluated by an intergranular corrosion test.
The intergranular corrosion test is an accelerated metal corrosion test method for testing intergranular corrosion sensitivity of a metal material under a specific medium condition, and is characterized in that various test solutions capable of enabling the corrosion potential of the metal to be in a specific interval of a constant potential anodic polarization curve are adopted, and intergranular corrosion is accelerated and displayed by utilizing the obvious difference of corrosion current of crystal grains and grain boundaries of the metal in the potential interval. The method of testing for Intergranular corrosion of Stainless steel is standardized in many countries, and the details of the test are specified in ASTM A-262 Standard practice for Detecting and evaluating the reliability of inter-granular Corrosion in Austenitic Stainless Steels, GB/T21433 test for Intergranular corrosion Susceptibility of Stainless steel pressure vessels. The method specified by the standard summary is many, including a screening method and a testing method; the basic method of the test method is to soak (or cook) the intergranular corrosion sample in an acid solution with a specified concentration for a certain time, and then to perform the test. In addition, different methods are adopted for different types of stainless steel, such as a bending method adopted by a sulfuric acid-copper sulfate method, a nitric acid-hydrofluoric acid method adopted by a sulfuric acid-copper sulfate method, and a weighing method adopted by a 65% nitric acid corrosion test; the basic method is to soak (or boil) an intercrystalline corrosion sample in an acid solution with a specified concentration for a certain time, and then to test to verify the intercrystalline corrosion resistance of the stainless steel. During the test, a container with a reflux condenser of sufficient capacity and with sufficient cooling capacity needs to be prepared to prevent the concentration of the test solution and ensure the accuracy and effectiveness of the test.
Therefore, the technical personnel in the field provide an instrument for stainless steel copper sulfate intergranular corrosion test and a using method thereof, so as to solve the problems in the background technology.
Disclosure of Invention
The instrument for the stainless steel copper sulfate intercrystalline corrosion test and the use method thereof are simple to operate, can meet the requirement of the copper sulfate intercrystalline corrosion standard, perform intercrystalline corrosion test operation, and ensure the accuracy, reliability and effectiveness of the intercrystalline corrosion test.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention relates to an instrument for stainless steel copper sulfate intergranular corrosion test, which comprises:
grinding the bottle;
the bottom end of the condenser is matched with the bottle mouth of the ground bottle;
the condenser comprises a condensation straight pipe and a condensation pipe arranged in the condensation straight pipe, and condensate is filled between the inner wall of the condensation straight pipe and the outer wall of the condensation pipe;
the condensation pipe comprises a condensation bulb pipe and a serpentine coil pipe, the air inlet end of the condensation bulb pipe is communicated with the air inlet, the air inlet is formed in the outer side of the bottom end of the condensation straight pipe and extends into a bottle opening of the ground bottle, the air outlet end of the condensation bulb pipe is communicated with the air inlet end of the serpentine coil pipe, the air outlet end of the serpentine coil pipe is provided with an air outlet pipe, the air outlet pipe is communicated with the air outlet at the top end of the condensation straight pipe, and the connection position of the condensation straight pipe and the air outlet is sealed through a spherical seal head.
Furthermore, the condensation bulb includes a plurality of spherical pipes, and is a plurality of the spherical pipe sets up along the length direction of condensation straight tube, and the transition of inside circular arc draws in between the adjacent spherical pipe.
Further, a water inlet pipe is arranged at the bottom end of the condensation straight pipe; the inlet tube has first horizontal tube portion and first pipe chute portion, the play water end and the condensation straight tube intercommunication of first horizontal tube portion, the end of intaking of first horizontal tube portion and the play water end intercommunication of first pipe chute portion, the end of intaking of first pipe chute portion has the water inlet, the end of intaking of first pipe chute portion is kept away from condensation straight tube setting, and the end of intaking of first pipe chute portion is located the top of play water end.
Further, the top of condensation straight tube is provided with the outlet pipe, the outlet pipe has second horizontal tube portion and second down tube portion, the end of intaking and the condensation straight tube intercommunication of second horizontal tube portion, the play water end of second horizontal tube portion and the end intercommunication of intaking of second down tube portion, the play water end of second down tube portion has the delivery port, the end of intaking of second down tube portion is kept away from the setting of condensation straight tube, and the play water end of second down tube portion is located the below of the end of intaking.
Furthermore, the condensation straight pipe, the condensation bulb pipe and the snake-shaped coil pipe are of an integrally formed structure.
Preferably, the number of the bulbs is 2-4, and the diameter of the bulbs is 30 mm.
Preferably, the minimum diameter of the inward circular arc transition convergence part between the adjacent spherical tubes is 15 mm.
Preferably, the coiled serpentine is 8-16 turns, the thread pitch is 20mm, and the diameter is 6 mm.
Preferably, the diameter of the condensation straight pipe is 50mm
The invention relates to a using method of an instrument for a stainless steel copper sulfate intercrystalline corrosion test, which specifically comprises the following steps:
1) dissolving quantitative analytically pure copper sulfate in quantitative distilled water or deionized water, adding quantitative analytically pure sulfuric acid, diluting with distilled water or deionized water to a specified volume, and preparing into sulfuric acid-copper sulfate solution;
2) before the test, the processed sample is degreased by using a proper solvent or a proper detergent and dried;
3) laying a layer of copper scraps or copper particles at the bottom of the ground bottle, and then placing a sample;
4) the test solution should be 20mm higher than the uppermost layer sample, and a new test solution should be used in each test;
5) a water inlet at the bottom of the condenser is communicated with a rubber water pipe, and a water outlet of the condenser is communicated with the rubber water pipe and is communicated with cooling water;
6) putting the ground bottle with the sample on a heating device, covering a condenser, heating the test solution in a ventilation device to keep the test solution in a slightly boiling state, and starting the test period to time when the solution reaches the boiling point.
In the technical scheme, the instrument for the stainless steel copper sulfate intergranular corrosion test and the use method thereof have the following beneficial effects: flowing water flows in through the water inlet pipe and passes through a space between the inner wall of the condensation straight pipe and the outer wall of the condensation pipe, steam entering the inner space of the condensation bulb pipe and the serpentine coil pipe is condensed, and condensed water is collected downwards along the inner wall of the condensation bulb pipe and flows into a solution, so that the reduction of the solution page is avoided, and the concentration of the solution is ensured; the method can meet the requirement of the standard of intergranular corrosion of the copper sulfate, carry out intergranular corrosion test operation, and ensure the accuracy, reliability and effectiveness of the intergranular corrosion test.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of an internal structure of a condenser in an instrument for testing intergranular corrosion of stainless steel copper sulfate according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a ground bottle in an apparatus for testing intergranular corrosion of stainless steel copper sulfate according to an embodiment of the present invention.
Description of reference numerals:
1. grinding the bottle; 2. a condenser;
11. a bottle mouth;
21. condensing the straight pipe; 22. a condenser tube; 23. an air outlet; 24. a spherical end enclosure 25 and a water inlet pipe; 26. a water outlet pipe;
221. a condensing bulb; 222. a serpentine coil; 223. an air inlet; 224. an air outlet pipe;
2211. a bulb tube;
251. a first horizontal tube portion; 252. a first inclined tube portion; 253. a water inlet;
261. a second horizontal tube portion; 262. a second inclined tube portion; 263. and (7) a water outlet.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1;
the instrument for the stainless steel copper sulfate intercrystalline corrosion test and the use method thereof provided by the embodiment of the invention comprise:
grinding the bottle 1;
the bottom end of the condenser 2 is matched with the bottle mouth 11 of the ground bottle 1;
the condenser 2 comprises a condensation straight pipe 21 and a condensation pipe 22 arranged in the condensation straight pipe 21, and condensate is filled between the inner wall of the condensation straight pipe 21 and the outer wall of the condensation pipe 22;
the condenser pipe 22 comprises a condenser bulb 221 and a serpentine coil 222, the air inlet end of the condenser bulb 221 is communicated with the air inlet 223, the air inlet 223 is arranged on the outer side of the bottom end of the condenser straight pipe 21 and extends into the bottle opening 11 of the ground bottle 1, the air outlet end of the condenser bulb 221 is communicated with the air inlet end of the serpentine coil 222, the air outlet end of the serpentine coil 222 is provided with an air outlet pipe 224, the air outlet pipe 224 is communicated with the air outlet 23 on the top end of the condenser straight pipe 21, the joint of the condenser straight pipe 21 and the air outlet 23 is sealed through a spherical seal head 24, and the air outlet 23 ensures that air can be discharged into the atmosphere from the ground bottle 1.
Concretely, when heating ground bottle 1, its inside solution can evaporate, the gas of evaporation gets into condenser bulb 221 and serpentine 222, the outer condensate of condenser bulb and serpentine 222 condenses gas, and via condenser bulb 221 and serpentine 222 inner wall slip in ground bottle 1, avoid the solution concentration change in ground bottle 1, can satisfy the intergranular corrosion standard requirement of copper sulfate, carry out intergranular corrosion test operation, guarantee intergranular corrosion test's accuracy, reliability and validity.
The condensation bulb 221 includes a plurality of bulbs 2211, the bulbs 2211 are arranged along the length direction of the condensation straight tube 21, and adjacent bulbs 2211 are converged in an inward arc transition manner. The number of the spherical tubes 2211 is 2-4, and the diameter of the spherical tube 2211 is 30 mm. The minimum diameter of the transition converging part of the inward circular arc between the adjacent condensing spherical pipes 2211 is 15 mm. The serpentine coil 222 is 8-16 turns, the pitch is 20mm, and the diameter is 6 mm. The diameter of the condensation straight pipe 21 is 50 mm. The inward arc transition furling structure between the spherical pipe 2211 and the adjacent spherical pipe 2211 and the size structure of the serpentine coil can increase the cooling area and improve the condensation effect of gas.
The bottom end of the condensation straight pipe 21 is provided with a water inlet pipe 25; the water inlet pipe 25 is provided with a first horizontal pipe part 251 and a first inclined pipe part 252, the water outlet end of the first horizontal pipe part 251 is communicated with the condensation straight pipe 21, the water inlet end of the first horizontal pipe part 251 is communicated with the water outlet end of the first inclined pipe part 252, the water inlet end of the first inclined pipe part 252 is provided with a water inlet 253, the water inlet end of the first inclined pipe part 252 is far away from the condensation straight pipe 21, and the water inlet end of the first inclined pipe part 252 is positioned above the water outlet end.
The top of condensation straight tube 21 is provided with outlet pipe 26, outlet pipe 26 has second horizontal tube portion 261 and second pipe chute 262, the end of intaking of second horizontal tube portion 261 communicates with condensation straight tube 21, and the play water end of second horizontal tube portion 261 and the end intercommunication of intaking of second pipe chute 262, and the play water end of second pipe chute 262 has delivery port 263, the end of intaking of second pipe chute 262 keeps away from condensation straight tube 21 setting, and the play water end of second pipe chute 262 is located the below of intaking the end. The water outlet 263 and the water inlet 253 are arranged to facilitate connection with a rubber water pipe. The design of downward sloping outlet pipe 26 is convenient for insert the rubber water pipe, effectively avoids inserting the straight tube because of the rubber water pipe level, atress for a long time at the kneck to at the easy problem of damaging of corrosive medium. The condenser 2 is cooled by flowing water, the boiling liquid is condensed, and condensed water is dripped into the solution along the inner wall of the condensing bulb 221 so as to ensure the concentration of the solution.
The condensation straight pipe 21, the condensation bulb 221 and the serpentine coil 222 are of an integrally formed structure. The integral sealing effect is ensured. The condensation straight tube 21, the condensation bulb 221, the serpentine coil 222 and the ground bottle 1 are made of heat-resistant hard glass for rapid cooling and rapid heating resistance and chemical analysis, the wall thickness is required to be uniform, the condensation 2 and the bottle mouth 11 of the ground bottle 1 are required to be close and matched, the grinding treatment is required to be completely sealed, and the condenser 2 and the bottle mouth 11 of the ground bottle 1 can be matched with each other.
The glass of the ground bottle 1 body is 1.5-2mm, the mark scale is at least one mark per 200ml, and the ground taper is 1: 20.
The invention relates to a using method of an instrument for a stainless steel copper sulfate intercrystalline corrosion test, which specifically comprises the following steps:
1) dissolving quantitative analytically pure copper sulfate in quantitative distilled water or deionized water, adding quantitative analytically pure sulfuric acid, diluting with distilled water or deionized water to a specified volume, and preparing into sulfuric acid-copper sulfate solution; when the concentrated sulfuric acid is mixed with water, the mixing must be carried out in heat-resistant containers such as beakers and conical flasks, and the concentrated sulfuric acid is slowly added into the water, so that the water cannot be poured into the sulfuric acid, otherwise, explosion and burn accidents are caused;
2) before the test, the processed sample is degreased by using a proper solvent or a proper detergent and dried; the solvent or detergent is non-chloride, such as soap water and acetone;
3) laying a layer of copper scraps or copper particles at the bottom of the ground bottle 1, wherein the purity of the copper scraps or copper particles is not less than 99.5%, and then placing a sample; under the condition that each sample is in contact with copper scraps, a plurality of layers of samples of the same steel grade are allowed to be placed in the same ground bottle 1, but the samples are not in contact with each other;
4) the test solution should be 20mm higher than the uppermost layer sample, and a new test solution should be used in each test;
5) a water inlet 253 at the bottom of the condenser 2 is communicated with a rubber water pipe, and a water outlet 263 of the condenser 2 is communicated with the rubber water pipe and is communicated with cooling water;
6) putting the ground bottle 1 with the sample on a heating device, covering a condenser 2, heating the test solution in a ventilation device to keep the test solution in a slightly boiling state, and starting the test period to time when the solution reaches the boiling point.
7) The test was completed according to the standard requirements and the intergranular corrosion resistance of the test specimens was evaluated.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (10)
1. An instrument for stainless steel copper sulfate intergranular corrosion tests is characterized by comprising:
a ground bottle (1);
the bottom end of the condenser (2) is matched with the bottle mouth (11) of the ground bottle (1);
the condenser (2) comprises a condensation straight pipe (21) and a condensation pipe (22) arranged in the condensation straight pipe (21), and condensate is filled between the inner wall of the condensation straight pipe (21) and the outer wall of the condensation pipe (22);
the condensation pipe (22) comprises a condensation bulb pipe (221) and a serpentine coil pipe (222), the air inlet end of the condensation bulb pipe (221) is communicated with the air inlet (223), the air inlet (223) is formed in the outer side of the bottom end of the condensation straight pipe (21) and extends into the bottle mouth (11) of the ground bottle (1), the air outlet end of the condensation bulb pipe (221) is communicated with the air inlet end of the serpentine coil pipe (222), the air outlet end of the serpentine coil pipe (222) is provided with an air outlet pipe (224), the air outlet pipe (224) is communicated with the air outlet (23) at the top end of the condensation straight pipe (21), and the joint of the condensation straight pipe (21) and the air outlet (23) is sealed through a spherical seal head (24).
2. The stainless steel copper sulfate intergranular corrosion testing instrument according to claim 1, wherein the condensation bulb (221) comprises a plurality of spherical tubes (2211), the plurality of spherical tubes (2211) are arranged along the length direction of the condensation straight tube (21), and adjacent spherical tubes (2211) are converged in a transition mode towards an inner circular arc.
3. The stainless steel copper sulfate intergranular corrosion testing instrument according to claim 1, wherein a water inlet pipe (25) is provided at the bottom end of the condensation straight pipe (21); the water inlet pipe (25) is provided with a first horizontal pipe portion (251) and a first inclined pipe portion (252), the water outlet end of the first horizontal pipe portion (251) is communicated with the condensation straight pipe (21), the water inlet end of the first horizontal pipe portion (251) is communicated with the water outlet end of the first inclined pipe portion (252), the water inlet end of the first inclined pipe portion (252) is provided with a water inlet (253), the water inlet end of the first inclined pipe portion (252) is far away from the condensation straight pipe (21), and the water inlet end of the first inclined pipe portion (252) is located above the water outlet end.
4. The stainless steel copper sulfate intergranular corrosion test instrument as recited in claim 3, wherein the top end of the condensation straight pipe (21) is provided with an outlet pipe (26), the outlet pipe (26) is provided with a second horizontal pipe portion (261) and a second inclined pipe portion (262), the water inlet end of the second horizontal pipe portion (261) is communicated with the condensation straight pipe (21), the water outlet end of the second horizontal pipe portion (261) is communicated with the water inlet end of the second inclined pipe portion (262), the water outlet end of the second inclined pipe portion (262) is provided with a water outlet (263), the water inlet end of the second inclined pipe portion (262) is arranged away from the condensation straight pipe (21), and the water outlet end of the second inclined pipe portion (262) is positioned below the water inlet end.
5. The stainless steel copper sulfate intergranular corrosion testing instrument according to claim 4, wherein the condensation straight tube (21), the condensation bulb tube (221) and the serpentine coil (222) are of an integrally formed structure.
6. The apparatus as claimed in claim 2, wherein the number of said spherical tubes (2211) is 2-4, and the diameter of said spherical tube (2211) is 30 mm.
7. The apparatus as claimed in claim 6, wherein the minimum diameter of the inward circular transition convergence between adjacent spherical tubes (2211) is 15 mm.
8. The stainless steel copper sulfate intergranular corrosion testing instrument of claim 5, wherein the serpentine coil (222) has 8-16 turns, a pitch of 20mm, and a diameter of 6 mm.
9. The apparatus as claimed in claim, wherein the diameter of the straight condensing pipe (21) is 50 mm.
10. The stainless steel copper sulfate intergranular corrosion testing instrument according to any one of claims 1 to 9, wherein the use method of the instrument specifically comprises the following steps:
1) dissolving quantitative analytically pure copper sulfate in quantitative distilled water or deionized water, adding quantitative analytically pure sulfuric acid, diluting with distilled water or deionized water to a specified volume, and preparing into sulfuric acid-copper sulfate solution;
2) before the test, the processed sample is degreased by using a proper solvent or a proper detergent and dried;
3) laying a layer of copper scraps or copper particles at the bottom of the ground bottle (1), and then placing a sample;
4) the test solution should be 20mm higher than the uppermost layer sample, and a new test solution should be used in each test;
5) a water inlet (253) at the bottom of the condenser (2) is communicated with a rubber water pipe, and a water outlet (263) of the condenser (2) is communicated with the rubber water pipe and is communicated with cooling water;
6) putting the ground bottle (1) with the sample on a heating device, covering a condenser (2), heating the test solution in a ventilation device to keep the test solution in a slightly boiling state, and starting the test period to time when the solution reaches the boiling point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110941245.4A CN113720754A (en) | 2021-08-17 | 2021-08-17 | Instrument for stainless steel copper sulfate intergranular corrosion test and use method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110941245.4A CN113720754A (en) | 2021-08-17 | 2021-08-17 | Instrument for stainless steel copper sulfate intergranular corrosion test and use method |
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| CN207379896U (en) * | 2017-11-21 | 2018-05-18 | 重庆市食品药品检验检测研究院 | A kind of resistance to boiling hydrochloric acid etching gravimetric method experimental rig of glass |
| CN209513549U (en) * | 2018-09-20 | 2019-10-18 | 兰州兰石检测技术有限公司 | Huey test ground triangular flask |
| CN210512705U (en) * | 2019-07-12 | 2020-05-12 | 深圳精益油脂技术有限公司 | Ball snake type condenser pipe |
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2021
- 2021-08-17 CN CN202110941245.4A patent/CN113720754A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008128783A (en) * | 2006-11-20 | 2008-06-05 | Kurita Water Ind Ltd | Boiler condensation system corrosion monitoring device |
| CN102128780A (en) * | 2010-01-14 | 2011-07-20 | 江苏省不锈钢制品质量监督检验中心 | Stainless steel intercrystalline corrosion automatic tester |
| CN106153430A (en) * | 2015-04-09 | 2016-11-23 | 中国科学院生态环境研究中心 | A kind of reverse-flow type deposit Organic substance rapid contractor |
| CN206671044U (en) * | 2017-04-14 | 2017-11-24 | 吉林省优尼普瑞科技有限公司 | A kind of determinator for crude fats special-shaped condenser |
| CN107340034A (en) * | 2017-08-02 | 2017-11-10 | 上海电气核电设备有限公司 | A kind of Huey test anti-rupture device |
| CN207379896U (en) * | 2017-11-21 | 2018-05-18 | 重庆市食品药品检验检测研究院 | A kind of resistance to boiling hydrochloric acid etching gravimetric method experimental rig of glass |
| CN209513549U (en) * | 2018-09-20 | 2019-10-18 | 兰州兰石检测技术有限公司 | Huey test ground triangular flask |
| CN210512705U (en) * | 2019-07-12 | 2020-05-12 | 深圳精益油脂技术有限公司 | Ball snake type condenser pipe |
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