CN105784803A - Clamp used for measuring stainless steel pipe outer surface critical point corrosion temperature - Google Patents
Clamp used for measuring stainless steel pipe outer surface critical point corrosion temperature Download PDFInfo
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- CN105784803A CN105784803A CN201610128590.5A CN201610128590A CN105784803A CN 105784803 A CN105784803 A CN 105784803A CN 201610128590 A CN201610128590 A CN 201610128590A CN 105784803 A CN105784803 A CN 105784803A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/283—Means for supporting or introducing electrochemical probes
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Abstract
The invention discloses a clamp used for measuring stainless steel pipe outer surface critical point corrosion temperature.The clamp comprises an upper clamp mechanism and a lower clamp mechanism.The upper clamp mechanism comprises a first clamping sleeve and a first clamping sleeve base.The bottom of the first clamping sleeve base is provided with a clamping ring.The clamping ring is in threaded connection with the interior of the first clamping sleeve.When the clamping ring gradually penetrates into and is connected with the interior of the first clamping sleeve, the clamping ring is gradually shrunk inwards.A contact piece is arranged in the first clamping sleeve base.The top of the first clamping sleeve base is provided with a leading-out wire base.The contact piece is electrically connected with a leading-out wire in the leading-out wire base.A washing groove is formed in the inner side face of the lower portion of the first clamping sleeve.The lower portion of the first clamping sleeve is further provided with a water flow channel.The clamp and a detection device can accurately measure the stainless steel pipe sample outer surface critical point corrosion temperature, can avoid influences of gap corrosion, solve the technical problems which are not solved all the time in the field, and have the groundbreaking significance.
Description
Technical field
The present invention relates to a kind of fixture for measuring stainless steel tube outer surface critical pitting temperature, belong to Electrochemical Measurement Technology field.
Background technology
What rustless steel referred to is by weight; the chromium content ferrous alloy more than 12%, owing to chromium is relatively big to the affinity of oxygen, at normal temperatures can be oxidized in atmosphere and generate chromium oxide film one layer fine and close and passivating film; protection steel will not continue oxidation and lure erosion, are therefore referred to as rustless steel.Owing to rustless steel has the chemistry of excellence, mechanical property, obtaining extensive use in the industrial departments such as oil, chemical industry, machinery, shipbuilding, nuclear power, military project, building, the articles for daily use becomes the basic material of national economy important department.
Rustless steel is classified by the difference according to tissue, and ferritic stainless steel, austenitic stainless steel, martensite can be divided into not to lure steel, austenite ferrite two phase stainless steel, precipitation-hardening not to lure five kinds of types of steel.Wherein, two-phase does not lure steel to refer to be made up of ferrite and austenitic duplex in its solid solution structure, and wherein a Phase Proportion be about 45 ~ 55%(amount look younger at least account for 30%) rustless steel.Owing to the feature of two-phase structure makes two phase stainless steel have the advantage of ferritic stainless steel and austenitic stainless steel concurrently, and ferritic stainless steel ratio, its toughness is high, brittle transition temperature is low, intergranular corrosion resistance and good welding performance.Remain the advantage that ferritic steel heat conductivity is high, the coefficient of expansion is little simultaneously.Two phase stainless steel development starts from generation in centurial year, and two phase stainless steel is own through having developed three generations so far.Along with world wide occur shortage of resources, nickel the market price high, promote to develop low cost, nickel-saving type two-phase does not lure steel such as DSS2001,2101,2304 etc., due to the interpolation of nitrogen and molybdenum, this type of significant reduction of rustless steel cost and corrosion resisting property is still outstanding.
But, ferrite and the allotrope phase of two kinds of ferrum of austenite is comprised due to two phase stainless steel, the advantage with ferritic stainless steel and austenitic stainless steel, but in the course of processing, also easily produce harmful secondary phase simultaneously, it is the most complicated in rustless steel, the most unmanageable steel grade.Especially after carrying out weld job, two-phase does not lure the seam organization of steel to develop has decisive influence to its corrosion resistance.Therefore two phase stainless steel corrosion behavior and find the method improving its corrosion resisting property that actual production and scientific research are had significant meaning under the different operating mode of research.
On the other hand, corrosion refers to the chemistry of material from environmental medium, electrochemical action and the phenomenon destroyed.Current etching problem is own through each department throughout Chinese national economy and national defense construction, causes sizable direct and consequential damage.Corrosion is divided into self-contained process to corrode corrosion (machinery promotes that inefficacy and environment cause cracking) the two big classes of (homogeneous corrosion, local corrosion, melted fused salt corrosion and microbiologic(al) corrosion etc.) and extraneous factor effect.Wherein, local corrosion be with the metal collective of environmental exposure on be confined to the corrosion failure that some region occurs, the appearance of the shape such as Chang Yidian hole, crackle, groove.Local corrosion is to occur at random on surface, it is difficult to prediction, and is likely to cause pernicious inefficacy to cause the sudden harm being difficult to prevent.Engineer applied finding, the form of partial corrosion not luring steel surface common has spot corrosion, crevice corrosion, intercrystalline corrosion, galvanic corrosion and stress corrosion cracking etc. several.
May give due to stainless corrosion failure produce, life bring serious harm, do not lure the generation of steel corrosion, genesis mechanism hence it has been recognized that understand and how to predict and suppress the importance of its generation；Especially spot corrosion and this two class of crevice corrosion most important, the most complicated local corrosion behavior.By furtheing investigate their presentation rule and mechanism, understand the essence of local corrosion and find the measure of prevention local corrosion, to reduce the loss of national economy.Presentation rule is divided into again endogenous cause of ill and exopathogenic factor two class.Endogenous cause of ill refers to not lure the alloying component (element such as chromium, nickel, molybdenum, carbon, nitrogen) of steel and organizational structure (field trash, crystal boundary, crystallite dimension, secondary-precipitated phase), and exopathogenic factor is surrounding medium composition (such as halide ion) and variations in temperature.In order to characterize the impact for local corrosion of these factors, it is necessary to take electrochemical method quick, convenient, accurate.
At present, the method evaluating rustless steel pitting corrosion in the world mainly has two kinds: chemical immersion method and electrochemical method.Wherein, electrochemical method may refer to ASTMG150-99, comprises dynamic potential polarization curve and determines pitting potential and critical pitting temperature.Pitting potential is to obtain in specific alloy/medium system, and namely required potential minimum occurs in spot corrosion.Measurement Breakdown potential is relatively simple but has the defects such as low, the poor repeatability of precision, generally requires and same sample is repeated repetitive measurement.Consider the limitation that pitting potential is evaluated, occur in that the concept of critical pitting temperature, be widely used at present in the middle of the spot corrosion appraisement system containing molybdenum high-alloy stainless steel.Presently, there are several method utilizing electrochemical method to carry out stainless steel product critical pitting temperature test and utensil, a kind of reference device that such as annex X2 mentions in ASTMG150 " StandardTestMethodforElectrochemicalCriticalPittingTempe ratureTestingofStainlesssteels " " FlushedPortCell " (washing away port electrolyzer), this electrolyzer can measure the critical pitting temperature of planar sample when avoiding crevice corrosion to occur.
But, above-mentioned electrolyzer can only test plane sample.And have the stainless steel pipe product of quite a lot of kind at present, for these stainless steel pipe products, way does not detect the outer surface material critical pitting temperature of its tubing at present.Therefore, a kind of fixture being specifically designed to and measuring stainless steel tube outer surface critical pitting temperature is developed, the outer surface of stainless steel tube sample is carried out critical pitting temperature test when avoiding crevice corrosion to occur, it is clear that there is the great significance of initiative.
Summary of the invention
The goal of the invention of the present invention is to provide a kind of fixture for measuring stainless steel tube outer surface critical pitting temperature.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of fixture for measuring stainless steel tube outer surface critical pitting temperature, including upper clamp mechanism and lower clamp mechanism,
Described upper clamp mechanism includes the first cutting ferrule and the first cutting ferrule base, and the bottom of described first cutting ferrule base is provided with snap ring, and snap ring is threadedly connected in the first cutting ferrule, and when snap ring is progressively deeply connected in the first cutting ferrule, snap ring is progressively to contract；
Being additionally provided with contact chip in described first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat, and contact chip electrically connects with the extraction wire drawn in wire seat；
Being provided with flushing groove in the lower inside surface of described first cutting ferrule, the bottom of the first cutting ferrule is additionally provided with water stream channel, and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the first cutting ferrule；It is provided with sealing ring in described flushing groove；
Being additionally provided with annular connectivity slot in the bottom inside face of described first cutting ferrule, the top of annular connectivity slot connects with described flushing groove, concordant with the bottom of described first cutting ferrule bottom it；
Described lower clamp mechanism includes the second cutting ferrule and the second cutting ferrule base, and the top of described second cutting ferrule base is provided with snap ring, and snap ring is threadedly connected in the second cutting ferrule, and when snap ring is progressively deeply connected in the second cutting ferrule, snap ring is progressively to contract；
Being provided with flushing groove in the upper inner face of described second cutting ferrule, the top of the second cutting ferrule is additionally provided with water stream channel, and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the second cutting ferrule；It is provided with sealing ring in described flushing groove；Being additionally provided with annular connectivity slot in the inside top face of described second cutting ferrule, the bottom of annular connectivity slot connects with described flushing groove, and its top is concordant with the top of described second cutting ferrule.
Above, described upper clamp mechanism is mainly used to clamp stainless steel tube, concrete, first inserts in snap ring by stainless steel tube, then puts cutting ferrule and rotates so that snap ring, progressively to contract, can clamp stainless steel tube.The principle of described lower clamp mechanism is also such.
Being additionally provided with contact chip in described first cutting ferrule base, contact chip is used to contact and realize electrical connection with stainless steel tube, is connected with working electrode eventually through drawing wire.
Described flushing groove is used to flowing distilled water, to rinse stainless steel tube outer surface, it is prevented that crevice corrosion occurs in its contact position, and described distilled water is pumped into by water stream channel.
The fixture of the present invention belongs to an ingredient of critical pitting temperature Testing apparatus, is mainly used to clamp stainless steel tube, and it coordinates with existing mechanism, it is possible to composition critical pitting temperature Testing apparatus.
In technique scheme, the setting symmetrical above and below of described upper clamp mechanism and lower clamp mechanism.
In technique scheme, the flushing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is ring-shaped groove.
In technique scheme, the volume rinsing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is be more than or equal to 10 cubic millimeters.
Preferably, in described first cutting ferrule, described sealing ring is positioned at the top rinsing groove.
Preferably, in described second cutting ferrule, described sealing ring is positioned at the bottom rinsing groove.
The present invention is claimed a kind of detecting device for measuring stainless steel tube outer surface critical pitting temperature simultaneously, including above-mentioned fixture and three-electrode system,
Described three-electrode system includes working electrode, reference electrode and to electrode, described to electrode ringwise, and around the periphery of the stainless steel tube being located at by described holder.
Electrode is had following benefit by annular: owing to test sample (working electrode) is cylindrical, and there is resistance in test solution itself, use annular electrode can make (sample surfaces) working electrode and to the distance approximately equal between electrode, therefore working electrode and potential difference between electrode is more uniformly spread, reduces measurement error.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that
1, the present invention develops a kind of new fixture for measuring stainless steel tube outer surface critical pitting temperature, it is specifically used to measurement stainless steel pipe curved surface print, experiment proves, the fixture of the present invention and detecting device can record the outer surface of stainless steel tube sample exactly and carry out critical pitting temperature, and the impact of crevice corrosion can be avoided, the technical barrier solving this area long-term existence but be not solved by all the time, has the great significance of initiative；
2, the simple in construction of the present invention, it is easy to operation, is suitable to popularization and application.
Accompanying drawing explanation
Fig. 1 is the assembling schematic diagram of fixture and stainless steel tube in the embodiment of the present invention one.
Fig. 2 is the sectional view of upper clamp mechanism in the embodiment of the present invention one.
Fig. 3 is the sectional view of lower clamp mechanism in the embodiment of the present invention one.
Fig. 4 is the sectional view in the embodiment of the present invention one after the assembling of upper clamp mechanism and stainless steel tube.
Fig. 5 is the structural representation of the embodiment of the present invention two.
Wherein: 1, upper clamp mechanism；2, lower clamp mechanism；3, the first cutting ferrule；4, the first cutting ferrule base；5, snap ring；6, contact chip；7, wire seat is drawn；8, wire is drawn；9, groove is rinsed；10, water stream channel；11, sealing ring；12, annular connectivity slot；13, the second cutting ferrule；14, the second cutting ferrule base；15, stainless steel tube；16, pore；17, filter paper；18, working electrode；19, reference electrode；20, to electrode.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment one
Shown in accompanying drawing 1 ~ 4, a kind of fixture for measuring stainless steel tube outer surface critical pitting temperature, including upper clamp mechanism 1 and lower clamp mechanism 2,
Described upper clamp mechanism includes the first cutting ferrule 3 and the first cutting ferrule base 4, and the bottom of described first cutting ferrule base is provided with snap ring 5, and snap ring is threadedly connected in the first cutting ferrule, and when snap ring is progressively deeply connected in the first cutting ferrule, snap ring is progressively to contract；
Being additionally provided with contact chip 6 in described first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat 7, and contact chip electrically connects with the extraction wire 8 drawn in wire seat；Draw in wire seat and be additionally provided with pore 16；
The temperature of test device is likely in a big way to change (2 ~ 120 DEG C), it is desirable to have pore and air connect with pressure change (when particularly screwing between cutting ferrule) inside and outside balancing fixture；Therefore pore it is provided with；
Being provided with flushing groove 9 in the lower inside surface of described first cutting ferrule, the bottom of the first cutting ferrule is additionally provided with water stream channel 10, and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the first cutting ferrule；It is provided with sealing ring 11 in described flushing groove；
Being additionally provided with annular connectivity slot 12 in the bottom inside face of described first cutting ferrule, the top of annular connectivity slot connects with described flushing groove, concordant with the bottom of described first cutting ferrule bottom it；
Described lower clamp mechanism includes the second cutting ferrule 13 and the second cutting ferrule base 14, and the top of described second cutting ferrule base is provided with snap ring, and snap ring is threadedly connected in the second cutting ferrule, and when snap ring is progressively deeply connected in the second cutting ferrule, snap ring is progressively to contract；
Being provided with flushing groove in the upper inner face of described second cutting ferrule, the top of the second cutting ferrule is additionally provided with water stream channel, and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the second cutting ferrule；It is provided with sealing ring in described flushing groove；Being additionally provided with annular connectivity slot in the inside top face of described second cutting ferrule, the bottom of annular connectivity slot connects with described flushing groove, and its top is concordant with the top of described second cutting ferrule.
Described upper clamp mechanism is mainly used to clamp stainless steel tube 15, concrete, first inserts in snap ring by stainless steel tube, then puts cutting ferrule and rotate so that snap ring, progressively to contract, can clamp stainless steel tube.The principle of described lower clamp mechanism is also such.
Being additionally provided with contact chip 6 in described first cutting ferrule base, contact chip is used to contact and realize electrical connection with stainless steel tube, is connected with working electrode eventually through drawing wire 8.
Described flushing groove is used to flowing distilled water, to rinse stainless steel tube outer surface, it is prevented that crevice corrosion occurs in its contact position, and described distilled water is pumped into by water stream channel 10, is additionally provided with filter paper 17 between stainless steel tube and sealing ring.Shown in Figure 4.
The setting symmetrical above and below of described upper clamp mechanism and lower clamp mechanism.
The flushing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is ring-shaped groove.
The volume rinsing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is 20 cubic millimeters, and its degree of depth is about 2.2mm, and length is about 5.5mm.
In described first cutting ferrule, described sealing ring is positioned at the top rinsing groove.In described second cutting ferrule, described sealing ring is positioned at the bottom rinsing groove.
Embodiment two
Shown in Figure 5, a kind of detecting device for measuring stainless steel tube outer surface critical pitting temperature, including the fixture described in embodiment one and three-electrode system,
Described three-electrode system includes working electrode 18, reference electrode 19 and to electrode 20, described to electrode ringwise, and around the periphery of the stainless steel tube being located at by described holder.
Claims (7)
1. the fixture being used for measuring stainless steel tube outer surface critical pitting temperature, it is characterised in that: include clamp mechanism (1) and lower clamp mechanism (2),
Described upper clamp mechanism includes the first cutting ferrule (3) and the first cutting ferrule base (4), the bottom of described first cutting ferrule base is provided with snap ring (5), snap ring is threadedly connected in the first cutting ferrule, when snap ring is progressively deeply connected in the first cutting ferrule, snap ring is progressively to contract；
Being additionally provided with contact chip (6) in described first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat (7), and contact chip electrically connects with the extraction wire (8) drawn in wire seat；
Being provided with flushing groove (9) in the lower inside surface of described first cutting ferrule, the bottom of the first cutting ferrule is additionally provided with water stream channel (10), and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the first cutting ferrule；Sealing ring (11) it is provided with in described flushing groove；
Being additionally provided with annular connectivity slot (12) in the bottom inside face of described first cutting ferrule, the top of annular connectivity slot connects with described flushing groove, concordant with the bottom of described first cutting ferrule bottom it；
Described lower clamp mechanism includes the second cutting ferrule (13) and the second cutting ferrule base (14), the top of described second cutting ferrule base is provided with snap ring, snap ring is threadedly connected in the second cutting ferrule, and when snap ring is progressively deeply connected in the second cutting ferrule, snap ring is progressively to contract；
Being provided with flushing groove in the upper inner face of described second cutting ferrule, the top of the second cutting ferrule is additionally provided with water stream channel, and one end of this water stream channel connects with described flushing groove, and the other end is positioned at the lateral surface of the second cutting ferrule；It is provided with sealing ring in described flushing groove；Being additionally provided with annular connectivity slot in the inside top face of described second cutting ferrule, the bottom of annular connectivity slot connects with described flushing groove, and its top is concordant with the top of described second cutting ferrule.
2. the fixture for measuring stainless steel tube outer surface critical pitting temperature according to claim 1, it is characterised in that: the setting symmetrical above and below of described upper clamp mechanism and lower clamp mechanism.
3. the fixture for measuring stainless steel tube outer surface critical pitting temperature according to claim 1, it is characterised in that: the flushing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is ring-shaped groove.
4. the fixture for measuring stainless steel tube outer surface critical pitting temperature according to claim 3, it is characterised in that: the volume rinsing groove rinsing groove and the second cutting ferrule of described first cutting ferrule is be more than or equal to 10 cubic millimeters.
5. the fixture for measuring stainless steel tube outer surface critical pitting temperature according to claim 1, it is characterised in that: in described first cutting ferrule, described sealing ring is positioned at the top rinsing groove.
6. the fixture for measuring stainless steel tube outer surface critical pitting temperature according to claim 1, it is characterised in that: in described second cutting ferrule, described sealing ring is positioned at the bottom rinsing groove.
7. the detecting device being used for measuring stainless steel tube outer surface critical pitting temperature, it is characterised in that: include the fixture described in claim 1 and three-electrode system,
Described three-electrode system includes working electrode, reference electrode and to electrode, described to electrode ringwise, and around the periphery of the stainless steel tube being located at by described holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610128590.5A CN105784803B (en) | 2016-03-07 | 2016-03-07 | A kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610128590.5A CN105784803B (en) | 2016-03-07 | 2016-03-07 | A kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature |
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| Publication Number | Publication Date |
|---|---|
| CN105784803A true CN105784803A (en) | 2016-07-20 |
| CN105784803B CN105784803B (en) | 2018-04-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110186967A (en) * | 2019-05-17 | 2019-08-30 | 超威电源有限公司 | Three electrode inspectors |
| CN110286081A (en) * | 2018-03-19 | 2019-09-27 | 宝山钢铁股份有限公司 | A kind of pure water infiltration type immersion corrosion laboratory holder and experimental provision |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110286081A (en) * | 2018-03-19 | 2019-09-27 | 宝山钢铁股份有限公司 | A kind of pure water infiltration type immersion corrosion laboratory holder and experimental provision |
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| CN110186967B (en) * | 2019-05-17 | 2021-06-18 | 超威电源集团有限公司 | Three-electrode detection device |
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| Publication number | Publication date |
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| CN105784803B (en) | 2018-04-03 |
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