CN105784803B - A kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature - Google Patents
A kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature Download PDFInfo
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- CN105784803B CN105784803B CN201610128590.5A CN201610128590A CN105784803B CN 105784803 B CN105784803 B CN 105784803B CN 201610128590 A CN201610128590 A CN 201610128590A CN 105784803 B CN105784803 B CN 105784803B
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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 kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature, including upper fixture mechanism and lower clamp mechanism, upper fixture mechanism includes the first cutting ferrule and the first cutting ferrule base, the bottom of first cutting ferrule base is provided with snap ring, 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；Contact chip is additionally provided with 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 in extraction wire seat；It is provided with the lower inside surface of first cutting ferrule and rinses groove, the bottom of the first cutting ferrule is additionally provided with water stream channel.The outer surface that the fixture and detection means of the present invention can measure stainless steel tube sample exactly carries out critical pitting temperature, and can avoid the influence of crevice corrosion, solves this area long-term existence but all the time without the technical barrier solved, has initiative meaning.
Description
Technical field
The present invention relates to a kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature, belong to electro-chemical test
Technical field.
Background technology
Stainless steel is to refer to by weight, ferrous alloy of the chromium content more than 12%, due to chromium to the affinity of oxygen compared with
Greatly, it is passivating film that can in atmosphere be oxidized at normal temperatures and generate one layer of fine and close chromium oxide film, protection steel will not by after
Continuous oxidation lures erosion, therefore is referred to as stainless steel.Because stainless steel has excellent chemistry, mechanical property, in oil, chemical industry, machine
Obtained in the industrial departments such as tool, shipbuilding, nuclear power, military project, building, daily necessities extensively using as national economy important department
Basic material.
Stainless steel is classified according to the difference of tissue, ferritic stainless steel, austenitic stainless steel, martensite can be divided into
Steel, austenite ferrite two phase stainless steel, precipitation-hardening is not lured or not the type of steel five.Wherein, two-phase does not lure steel to refer at it
Solid solution structure is made up of ferrite and austenitic duplex, and wherein a Phase Proportion is about 45 ~ 55%（Amount is few mutually at least to account for 30%）
Stainless steel.The advantages of making two phase stainless steel have ferritic stainless steel and austenitic stainless steel concurrently due to the feature of two-phase structure,
With ferritic stainless steel ratio, its toughness is high, brittle transition temperature is low, intergranular corrosion resistance and good welding performance.Remain iron simultaneously
The advantages of ferritic steel thermal conductivity factor is high, the coefficient of expansion is small.Two phase stainless steel development starts from generation in centurial year, so far two phase stainless steel
Oneself is through having developed three generations.With world wide, shortage of resources, the market price of nickel occur high, promotes to develop low cost, saves
Ni-type two-phase does not lure steel such as DSS2001,2101,2304 etc., due to the addition of nitrogen and molybdenum, such significant reduction of stainless steel cost and
Corrosion resisting property is still outstanding.
However, because two phase stainless steel includes the allotrope body phase of two kinds of iron of ferrite and austenite, there is ferrite
The advantages of stainless steel and austenitic stainless steel, but also easily produce harmful secondary phase in process simultaneously, it is in stainless steel
Most complicated, most unmanageable steel grade.Especially after weld job is carried out, it is anti-corrosion to its that two-phase does not lure the seam organization of steel to develop
Property has decisive influence.Therefore study two phase stainless steel corrosion behavior under different operating modes and find the method for improving its corrosion resisting property
There is significant meaning to actual production and scientific research.
On the other hand, corrosion refers to the chemistry of material from environmental medium, electrochemical action and the phenomenon destroyed.Corrosion at present
The own each department through throughout Chinese national economy and national defense construction of problem, causes sizable direct and consequential damage.Corrosion
It is divided into self-contained process corrosion（Homogeneous corrosion, local corrosion, melting fused salt corrosion and microbiologic(al) corrosion etc.）Acted on extraneous factor
Corrosion（Machinery promotes failure and environment to cause to ftracture）Two major classes.Wherein, local corrosion is in the metal collection contacted with environment
The corrosion failure of some regions generation is confined on body, is often occurred with shapes such as hole, crackle, grooves.Local corrosion is in table
Face occurs at random, it is difficult to predicts, and pernicious failure may be triggered to cause to be difficult to the sudden harm prevented.Found in engineer applied
The form of partial corrosion for not luring steel surface common has spot corrosion, crevice corrosion, intercrystalline corrosion, galvanic corrosion and stress corrosion cracking etc.
It is several.
Because the corrosion failure of stainless steel may give production, life to bring serious harm, hence it has been recognized that
Understand the generation for not luring steel corrosion, genesis mechanism and the importance for how predicting and suppressing its generation；Especially spot corrosion and seam
Gap corrodes the local corrosion behavior that this two class is most important, most complicated.By furtheing investigate their presentation rule and generation machine
System, understand the essence of local corrosion and find the measure of prevention local corrosion, to reduce the loss of national economy.Presentation rule is again
It is divided into internal cause and the class of external cause two.Internal cause refers to the alloying component for not luring steel（The elements such as chromium, nickel, molybdenum, carbon, nitrogen）And institutional framework（Folder
Debris, crystal boundary, crystallite dimension, secondary-precipitated phase）, and external cause is surrounding medium composition（Such as halide ion）And temperature change.For
Characterize influence of these factors for local corrosion, it is necessary to take it is quick, conveniently, accurate electrochemical method.
At present, the method for evaluating stainless steel pitting corrosion in the world mainly has two kinds：Chemical immersion method and electrochemical method.
Wherein, electrochemical method may refer to ASTM G150-99, and pitting potential and critical spot corrosion are determined comprising dynamic potential polarization curve
Temperature.Pitting potential is obtained in specific alloy/medium system, i.e. required potential minimum occurs for spot corrosion.Measurement rupture
Current potential is relatively simple but has the defects of low precision, poor repeatability, generally requires that same sample is repeated repeatedly to measure.Examine
Consider the limitation of pitting potential evaluation, the concept of critical pitting temperature occur, be widely used in height containing molybdenum at present
Among the spot corrosion appraisement system of stainless steel alloy.Presently, there are it is several utilize electrochemical method carry out the critical spot corrosion of stainless steel product
The method and utensil of temperature test, such as in ASTM G150 " Standard Test Method for
It is attached in Electrochemical Critical Pitting Temperature Testing of Stainless steels "
A kind of reference device that record X2 is mentioned " Flushed Port Cell "（Wash away port electrolytic cell）, this electrolytic cell can keep away
Exempt from the critical pitting temperature of measurement plane sample in the case that crevice corrosion occurs.
However, above-mentioned electrolytic cell can only test plane sample.And the stainless steel pipe for having suitable multiple types at present produces
Product, for these stainless steel pipe products, method does not detect the outer surface material critical pitting temperature of its tubing at present.Cause
This, a kind of fixture dedicated for measurement stainless steel tube outer surface critical pitting temperature of exploitation, to avoid crevice corrosion
In the case of critical pitting temperature test is carried out to the outer surface of stainless steel tube sample, it is clear that there is initiative great significance.
The content of the invention
The goal of the invention of the present invention is to provide a kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature.
To achieve the above object of the invention, the technical solution adopted by the present invention is：One kind is used to measure stainless steel tube outer surface
The fixture of critical pitting temperature, including upper fixture mechanism and lower clamp mechanism,
The upper fixture mechanism includes the first cutting ferrule and the first cutting ferrule base, and the bottom of the first cutting ferrule base is provided with card
Ring, snap ring are threadedly connected in the first cutting ferrule, and when snap ring is progressively deeply connected in the first cutting ferrule, snap ring is progressively inwardly received
Contracting；
Contact chip is additionally provided with the first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat, contact
Piece electrically connects with the extraction wire in extraction wire seat；
It is provided with the lower inside surface of first cutting ferrule and rinses groove, the bottom of the first cutting ferrule is additionally provided with water stream channel,
One end of the water stream channel connects with the flushing groove, and the other end is located at the lateral surface of the first cutting ferrule；In the flushing groove
Provided with sealing ring；
Annular connectivity slot, the top of annular connectivity slot and the flushing are additionally provided with the bottom inside face of first cutting ferrule
Groove connects, and its bottom is concordant with the bottom of first cutting ferrule；
The lower clamp mechanism includes the second cutting ferrule and the second cutting ferrule base, and the top of the second cutting ferrule base is provided with card
Ring, snap ring are threadedly connected in the second cutting ferrule, and when snap ring is progressively deeply connected in the second cutting ferrule, snap ring is progressively inwardly received
Contracting；
It is provided with the upper inner face of second cutting ferrule and rinses groove, the top of the second cutting ferrule is additionally provided with water stream channel,
One end of the water stream channel connects with the flushing groove, and the other end is located at the lateral surface of the second cutting ferrule；In the flushing groove
Provided with sealing ring；Be additionally provided with annular connectivity slot in the inside top face of second cutting ferrule, the bottom of annular connectivity slot with it is described
Groove connection is rinsed, its top is concordant with the top of second cutting ferrule.
Above, the upper fixture mechanism is mainly used to clamp stainless steel tube, specifically, stainless steel tube first is inserted into snap ring
It is interior, then put cutting ferrule and rotate so that snap ring is progressively to contract, you can clamp stainless steel tube.The lower clamp mechanism
Principle is also such.
Contact chip is additionally provided with the first cutting ferrule base, contact chip is electrically connected for contacting and realizing with stainless steel tube
Connect, be connected eventually through extraction wire with working electrode.
The flushing groove is for flowing distilled water, to rinse stainless steel tube outer surface, prevents its contact position from stitching
Gap is corroded, and the distilled water is pumped into by water stream channel.
The fixture of the present invention belongs to a part of critical pitting temperature test utensil, is mainly used to clamp stainless steel
Pipe, it coordinates with existing mechanism, can form critical pitting temperature test utensil.
In above-mentioned technical proposal, the upper fixture mechanism and lower clamp mechanism setting symmetrical above and below.
In above-mentioned technical proposal, the flushing groove of first cutting ferrule and the flushing groove of the second cutting ferrule are annular ditch
Groove.
In above-mentioned technical proposal, the volume of the flushing groove for rinsing groove and the second cutting ferrule of first cutting ferrule is more than etc.
In 10 cubic millimeters.
Preferably, in first cutting ferrule, the sealing ring is positioned at the top for rinsing groove.
Preferably, in second cutting ferrule, the sealing ring is positioned at the bottom for rinsing groove.
A kind of detection means for being used to measure stainless steel tube outer surface critical pitting temperature, bag is claimed in the present invention simultaneously
Above-mentioned fixture and three-electrode system are included,
The three-electrode system includes working electrode, reference electrode and to electrode, it is described to electrode in a ring, and around setting
In the periphery of the stainless steel tube clamped by the fixture.
Annular has following benefit to electrode：Due to test sample（Working electrode）It is cylinder, and tests solution and deposit in itself
In resistance, electrode can be made using annular（Sample surfaces）Working electrode and to the distance between electrode approximately equal, therefore
Working electrode and potential difference between electrode is more uniformly spread, reduce measurement error.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：
1st, the present invention develops a kind of new fixture for being used to measure stainless steel tube outer surface critical pitting temperature, special to use
To measure stainless steel pipe curved surface print, it is demonstrated experimentally that the fixture and detection means of the present invention can measure stainless steel exactly
The outer surface critical pitting temperature of pipe sample, and the influence of crevice corrosion can be avoided, solve this area long-term existence but beginning
Eventually without the technical barrier solved, there is initiative great significance；
2nd, structure of the invention is simple, easily operated, suitable for popularization and application.
Brief description of the drawings
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 fixture 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 after the assembling of upper fixture mechanism and stainless steel tube in the embodiment of the present invention one.
Fig. 5 is the structural representation of the embodiment of the present invention two.
Wherein：1st, upper fixture mechanism；2nd, lower clamp mechanism；3rd, the first cutting ferrule；4th, the first cutting ferrule base；5th, snap ring；6th, connect
Contact；7th, extraction wire seat；8th, extraction wire；9th, groove is rinsed；10th, water stream channel；11st, sealing ring；12nd, annular connectivity slot；
13rd, the second cutting ferrule；14th, the second cutting ferrule base；15th, stainless steel tube；16th, stomata；17th, filter paper；18th, working electrode；19th, reference electricity
Pole；20th, to electrode.
Embodiment
The present invention is further described with reference to embodiment.
Embodiment one
Referring to shown in accompanying drawing 1 ~ 4, a kind of fixture for being used to measure stainless steel tube outer surface critical pitting temperature, including upper folder
Have mechanism 1 and lower clamp mechanism 2,
The upper fixture mechanism includes the first cutting ferrule 3 and the first cutting ferrule base 4, and the bottom of the first cutting ferrule base is provided with
Snap ring 5, snap ring are threadedly connected in the first cutting ferrule, and when snap ring is progressively deeply connected in the first cutting ferrule, snap ring is progressively inside
Shrink；
Contact chip 6 is additionally provided with the first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat 7, connect
Contact electrically connects with the extraction wire 8 in extraction wire seat；Stomata 16 is additionally provided with extraction wire seat；
The temperature of test device may be in interior change in a big way（2~120℃）, it is necessary to there is stomata to be connected with air with flat
Pressure change inside and outside weighing apparatus fixture（When particularly being screwed between cutting ferrule）；Therefore it is provided with stomata；
It is provided with the lower inside surface of first cutting ferrule and rinses groove 9, the bottom of the first cutting ferrule is additionally provided with water stream channel
10, one end of the water stream channel connects with the flushing groove, and the other end is located at the lateral surface of the first cutting ferrule；The flushing groove
It is interior to be provided with sealing ring 11；
Annular connectivity slot 12, the top of annular connectivity slot and the punching are additionally provided with the bottom inside face of first cutting ferrule
Groove connection is washed, its bottom is concordant with the bottom of first cutting ferrule；
The lower clamp mechanism includes the second cutting ferrule 13 and the second cutting ferrule base 14, is set at the top of the second cutting ferrule base
There is 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 inside
Shrink；
It is provided with the upper inner face of second cutting ferrule and rinses groove, the top of the second cutting ferrule is additionally provided with water stream channel,
One end of the water stream channel connects with the flushing groove, and the other end is located at the lateral surface of the second cutting ferrule；In the flushing groove
Provided with sealing ring；Be additionally provided with annular connectivity slot in the inside top face of second cutting ferrule, the bottom of annular connectivity slot with it is described
Groove connection is rinsed, its top is concordant with the top of second cutting ferrule.
The upper fixture mechanism is mainly used to clamp stainless steel tube 15, specifically, first inserting stainless steel tube in snap ring, so
Cutting ferrule and rotated in rear enclosure so that snap ring is progressively to contract, you can clamp stainless steel tube.The principle of the lower clamp mechanism
It is such.
Contact chip 6 is additionally provided with the first cutting ferrule base, contact chip is electrically connected for contacting and realizing with stainless steel tube
Connect, be connected eventually through extraction wire 8 with working electrode.
The flushing groove is for flowing distilled water, to rinse stainless steel tube outer surface, prevents its contact position from stitching
Gap is corroded, and the distilled water is pumped into by water stream channel 10, and filter paper 17 is additionally provided between stainless steel tube and sealing ring.Referring to Fig. 4
It is shown.
The upper fixture mechanism and lower clamp mechanism setting symmetrical above and below.
The flushing groove of first cutting ferrule and the flushing groove of the second cutting ferrule are ring-shaped groove.
The volume of the flushing groove of first cutting ferrule and the flushing groove of the second cutting ferrule is 20 cubic millimeters, its depth
About 2.2mm, length about 5.5mm.
In first cutting ferrule, the sealing ring is positioned at the top for rinsing groove.In second cutting ferrule, the sealing ring
Positioned at the bottom for rinsing groove.
Embodiment two
It is shown in Figure 5, a kind of detection means for being used to measure stainless steel tube outer surface critical pitting temperature, including implement
Fixture and three-electrode system described in example one,
The three-electrode system includes working electrode 18, reference electrode 19 and to electrode 20, it is described to electrode in a ring, and
Around located at the periphery of the stainless steel tube clamped by the fixture.
Claims (7)
- A kind of 1. fixture for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that：Including upper fixture mechanism (1) and lower clamp mechanism (2),The upper fixture mechanism includes the first cutting ferrule (3) and the first cutting ferrule base (4), the bottom of the first cutting ferrule base are provided with Snap ring (5), snap ring are threadedly connected in the first cutting ferrule, when snap ring is progressively deeply connected in the first cutting ferrule, snap ring progressively to Contract；Contact chip (6) is additionally provided with the first cutting ferrule base, the top of the first cutting ferrule base is provided with extraction wire seat (7), connect Contact electrically connects with the extraction wire (8) in extraction wire seat；It is provided with the lower inside surface of first cutting ferrule and rinses groove (9), the bottom of the first cutting ferrule is additionally provided with water stream channel (10), one end of the water stream channel connects with the flushing groove, and the other end is located at the lateral surface of the first cutting ferrule；The flushing duct Sealing ring (11) is provided with groove；Annular connectivity slot (12), the top of annular connectivity slot and the flushing are additionally provided with the bottom inside face of first cutting ferrule Groove connects, and its bottom is concordant with the bottom of first cutting ferrule；The lower clamp mechanism includes the second cutting ferrule (13) and the second cutting ferrule base (14), is set at the top of the second cutting ferrule base There is 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 inside Shrink；It is provided with the upper inner face of second cutting ferrule and rinses groove, the top of the second cutting ferrule is additionally provided with water stream channel, the water One end of circulation road connects with the flushing groove, and the other end is located at the lateral surface of the second cutting ferrule；It is provided with the flushing groove Sealing ring；Annular connectivity slot, the bottom of annular connectivity slot and the flushing are additionally provided with the inside top face of second cutting ferrule Groove connects, and its top is concordant with the top of second cutting ferrule.
- 2. the fixture according to claim 1 for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that： The upper fixture mechanism and lower clamp mechanism setting symmetrical above and below.
- 3. the fixture according to claim 1 for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that： The flushing groove of first cutting ferrule and the flushing groove of the second cutting ferrule are ring-shaped groove.
- 4. the fixture according to claim 3 for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that： The volume of the flushing groove for rinsing groove and the second cutting ferrule of first cutting ferrule is more than or equal to 10 cubic millimeters.
- 5. the fixture according to claim 1 for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that： In first cutting ferrule, the sealing ring is positioned at the top for rinsing groove.
- 6. the fixture according to claim 1 for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that： In second cutting ferrule, the sealing ring is positioned at the bottom for rinsing groove.
- A kind of 7. detection means for being used to measure stainless steel tube outer surface critical pitting temperature, it is characterised in that：Will including right The fixture and three-electrode system described in 1 are sought,The three-electrode system includes working electrode, reference electrode and to electrode, it is described to electrode in a ring, and around be located at by The periphery of the stainless steel tube of the fixture clamping.
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 CN105784803A (en) | 2016-07-20 |
| CN105784803B true CN105784803B (en) | 2018-04-03 |
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| CN201610128590.5A Active 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286081B (en) * | 2018-03-19 | 2021-09-17 | 宝山钢铁股份有限公司 | Pure water immersion type immersion corrosion experiment clamp and experiment device |
| 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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| JPH02220769A (en) * | 1989-02-20 | 1990-09-03 | Furukawa Alum Co Ltd | Production of aluminum extruded flat tube for heat exchanger |
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| Publication number | Publication date |
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| CN105784803A (en) | 2016-07-20 |
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