CN105463475A - Corrosion resistance method of bimetal corrugated expansion joint - Google Patents
Corrosion resistance method of bimetal corrugated expansion joint Download PDFInfo
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- CN105463475A CN105463475A CN201510930221.3A CN201510930221A CN105463475A CN 105463475 A CN105463475 A CN 105463475A CN 201510930221 A CN201510930221 A CN 201510930221A CN 105463475 A CN105463475 A CN 105463475A
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- expansion joint
- bellow
- type expansion
- bimetal
- corrosion
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/52—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Joints Allowing Movement (AREA)
Abstract
The invention provides a corrosion resistance method of a bimetal corrugated expansion joint, and belongs to the technical field of expansion joints. The method includes the steps that a bimetal corrugated expansion joint of a double-layer structure including an inner layer and an outer layer is made from two or more metal materials; then, stretching forming is conducted on the bimetal corrugated expansion joint, solution treatment is conducted on the stretched bimetal corrugated expansion joint, and a cyanogen-containing compound and a nitrogen-containing compound are added when solution treatment is conducted so that cyanogen and nitrogen can permeate a base body of the corrugated expansion joint; and meanwhile, the wall thickness of the corrugated expansion joint is increased, and the corrosion-resistant bimetal corrugated expansion joint is obtained. The bimetal corrugated expansion joint which is of the double-layer structure including the inner layer and the outer layer is obtained through treatment in the manner, no corrosion happens when the bimetal corrugated expansion joint is placed in a solution with the chlorine salt content being 16% to be soaked for five years, and the corrosion resistance reliability of the bimetal corrugated expansion joint is fully shown.
Description
Technical field
The invention belongs to the technical field of telescopic joint, relate to the field of bellow-type expansion joint, be specifically related to a kind of corrosion-resistant method of bimetal bellow-type expansion joint, corrosion resistant bimetal bellow-type expansion joint can be obtained by process of the present invention, there is high corrosion resistance, extend the work-ing life of bellow-type expansion joint.
Background technology
The transmission of various medium all needs by Cemented filling, and these pipelines are the overwhelming majority be made up of metallic substance, and the corrosion of metallic substance occurs in the moment.Preventing the corrosion of metallic substance from making it durable in use, be the target pursued in people's moment, but result is unsatisfactory all the time.
The environment (soil, air) that exists of metallic conduit all contains water and steam etc., and they contain certain ionogen.Especially the metallic conduit in the pipeline buried underground, particularly seawater, the ionogen of surrounding enviroment is more, and therefore, metallic conduit nearly all exists galvanic corrosion.In addition, when metallic conduit uses as grounded transmitting wire, the pipeline be in electrolyte solution can be made to produce electrolysis and to react and corrode tube wall.Except this factor, static charge is ubiquitous, the corrosion of positive and negative electrostatic electrolytic action aggravation pipeline in the electrolyte, this corrosion is not peeling off layer by layer from outward appearance to inner essence, but corrode at the interstitial void of its free energy instability, what naked eyes can be observed is pin hole in blocks, and countless pin holes penetrates tube wall and makes it to leak.
In order to make, pipeline is firm, reliable, the life-span is long, and countless scientific and technical personnel have done unremitting effort.Usual way is: use monocrystalline pure iron, reduces intergranular corrosion; Separately have and choose material austenitic stainless steel at key position, in the hope of anticorrosion.All this kind all fails to solve root problem.For austenitic stainless steel series (304,316L, 254,825), their in the course of processing (smelting, rolling, thermal treatment) can not eliminate ferric remains ferritic (quantity is about 6%), these ferric remains ferritics are present in the edge of crystal boundary, in unsteady state, have also been changed austenitic lattice parameter, can there is electrolysis and oxidation corrosion in this tissue on one's own initiative.
While change material, optimize the coating protection of tube wall.And coating protection can only solve the anticorrosion of pipe network surface, there is limitation by the impact of medium temperature in the fluid channel of inner cavity of pipe, and the corrosion of inner cavity of pipe is difficult to take precautions against.
In recent years, China's iron and steel output surges, but iron ore resource is not enough, relies on import resources in a large number, and the ore that pool comes is all deposited to bank by sea-freight.Due to seawater Long Term Contact, ore chloride ion content is increased, and the chloride ion content in smelting process in blast furnace gas substantially exceeds domestic ore deposit.The coal gas of chloride ion-containing, under the effect of temperature and humidity, promotes electrolytic reaction, makes the weak link generation electrochemical reaction of pipeline.Performance is apparent that the Bellows expansion joint of thin-walled, and be countless pin holes under visual inspection, these pin holes are linked to be sheet and penetrate tube wall, and coal gas produces and leaks sky.
Summary of the invention
The present invention solves prior art fundamentally to solve the technical problem that bellow-type expansion joint is not corrosion-resistant, the life-span is short, provides a kind of corrosion-resistant method of bimetal bellow-type expansion joint, achieves the feature that Bellows expansion joint is firm, reliable, the life-span is long.
The present invention is the technical scheme realizing the employing of its object:
A corrosion-resistant method for bimetal bellow-type expansion joint, present method is made into the bimetal bellow-type expansion joint with internal layer and outer double-layer structure by adopting two or more metallic substance; Then bimetal bellow-type expansion joint is carried out drawing and forming, and the bimetal bellow-type expansion joint after stretching is carried out solution treatment, carrying out adding containing cyanogen compound and nitrogenous compound in solution treatment, making cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint; Increase the wall thickness of bellow-type expansion joint simultaneously, obtain corrosion resistant bimetal bellow-type expansion joint.
Described bimetal bellow-type expansion joint is made by following technique:
A, preparation pure iron plate and stainless steel plate are for subsequent use;
B, according to the girth of bellow-type expansion joint internal layer body cross section to be formed and the length of internal layer body, the pure iron plate got ready in steps A to be processed, obtain inner plating for subsequent use; According to the outer girth of body cross section of bellow-type expansion joint to be formed and the length of outer body, the stainless steel plate got ready in steps A is processed, obtain lamina rara externa for subsequent use;
C, the inner plating obtained in step B and lamina rara externa are welded into cylinder respectively, obtain internal layer body and outer body, then internal layer body and outer body are set in together, the cylinder be integrally fixed, pressing machine extrudes ripple, obtains bimetal bellow-type expansion joint.
The solution treatment of present method carries out in salt bath furnace, heat in the saline solution of the bellow-type expansion joint immersion salt bath furnace after drawing and forming, be added with containing cyanogen compound and nitrogenous compound in saline solution, bath salt temperature is 550-570 DEG C, cyanogen element and nitrogen element is made to penetrate in the matrix of bellow-type expansion joint, then 0.8-1.2h is incubated, air cooling of coming out of the stove.In solution treatment, cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint, and forming thickness is the infiltration layer of 0.005-0.1mm.
The solution treatment of present method carries out in salt bath furnace, heat in the saline solution of the bellow-type expansion joint immersion salt bath furnace after drawing and forming, be added with containing cyanogen compound and nitrogenous compound in saline solution, bath salt temperature is 560 DEG C, cyanogen element and nitrogen element is made to penetrate in the matrix of bellow-type expansion joint, then 1h is incubated, air cooling of coming out of the stove.
The invention has the beneficial effects as follows:
By the bellow-type expansion joint of mode process of the present invention, what obtain is inside and outside double-deck bimetal bellow-type expansion joint, bimetal bellow-type expansion joint of the present invention is placed in the solution containing villaumite 16%, soak 5 years, there is not any corrosion, fully present the Corrosion Resistant Reliability of bimetal bellow-type expansion joint.And the solution that existing common bellow-type expansion joint and existing double-deck bellow-type expansion joint are placed in containing villaumite 16% soaks, just by serious corrosion within the extremely short time, and can not use, faster than the time that is corroded of the present invention more than 5 times of its time be corroded.
The present invention realizes the corrosion resistance nature of bimetal bellow-type expansion joint by the combination of three aspects:
One is adopt two or more metal to cause inside and outside double-deck bimetal bellow-type expansion joint, the different electric conductivity of inside and outside metal is different, and the difference of internal layer and outer electric conductivity, the difference of potential difference slow down pipeline as electrocorrosion during wire;
Two is the wall thickness by increasing bellow-type expansion joint, increases the wave mode of telescopic joint, changes the life-span with wall thickness;
Three is carry out being permeated with cyanogen element and nitrogen element in solution treatment at bimetal bellow-type expansion joint, this non-metallic element is formed in metallic surface and keeps film, prevent the corrosion of chloride medium, Main Function after nitrogen, chlorine compound infiltration matrix: 1, solution strengthening and age hardening; 2, ferric remains ferritic is impelled to change austenite into; 3, change the collective organization of austenitic stainless steel, make it fine and close solid, improve intensity; 4, the titanium in nitrogen, cyanogen and steel or niobium form the master alloy of alloy compound, tie up, change residual ferritic orientation and structure, make it strengthening stable.
Embodiment
The present invention solves prior art fundamentally to solve the technical problem that bellow-type expansion joint is not corrosion-resistant, the life-span is short, provide a kind of corrosion-resistant method of bimetal bellow-type expansion joint, achieve the feature that Bellows expansion joint is firm, reliable, the life-span is long, the present invention is described further in conjunction with specific embodiments for lower area.
In principle: this telescopic joint is in the process made, after reel, die mould, stretching process, structure is changed, the structural order of molecule need be rebuild, carry out low temperature solid solution, recrystallize, the employing salt bath furnace of novelty of the present invention carries out heat treated, the liquation matrix of salt bath furnace is urea, adds 8-12mg/m
3prussiate, these compounds are very active in this bath salt temperature, and the double layer of metal metallographic of distortion is unstable, and by means of reset opportunity, cyanogen element and nitrogen element penetrate into the intergranular of proton nuclei, form new crystalline network and metallic substance, thus realize its erosion resistance.The cyanogen element of penetrating into metallic matrix and nitrogen element, be dissolved in metallic matrix, from macroscopically, thickness does not increase, but there is considerable change from microcosmic, the matrix of this polynary synthesis newly, make micro-density increase of matrix, intensity increase, anti-oxidant, anticorrosive, extend the life cycle of telescopic joint.
Embodiment 1
One, bimetal bellow-type expansion joint is prepared:
A, preparation pure iron plate and stainless steel plate are for subsequent use;
B, according to the girth of bellow-type expansion joint internal layer body cross section to be formed and the length of internal layer body, the pure iron plate got ready in steps A to be processed, obtain inner plating for subsequent use; According to the outer girth of body cross section of bellow-type expansion joint to be formed and the length of outer body, the stainless steel plate got ready in steps A is processed, obtain lamina rara externa for subsequent use;
C, the inner plating obtained in step B and lamina rara externa are welded into cylinder respectively, obtain internal layer body and outer body, then internal layer body and outer body are set in together, the cylinder be integrally fixed, pressing machine extrudes ripple, then carries out stretch processing, obtain bimetal bellow-type expansion joint.
Two, solution treatment:
Bimetal bellow-type expansion joint after stretching is carried out solution treatment, is carrying out adding containing cyanogen compound and nitrogenous compound in solution treatment, making cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint; Increase the wall thickness of bellow-type expansion joint, obtain corrosion resistant bimetal bellow-type expansion joint, concrete operations are as follows simultaneously:
The solution treatment of present method carries out in salt bath furnace, heat in the saline solution of the bellow-type expansion joint immersion salt bath furnace after drawing and forming, be added with containing cyanogen compound and urea in saline solution, bath salt temperature is 550-570 DEG C, cyanogen element and nitrogen element is made to penetrate in the matrix of bellow-type expansion joint, then 0.8-1.2h is incubated, air cooling of coming out of the stove.In solution treatment, cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint, and forming thickness is the infiltration layer of 0.005-0.1mm.Described nitrogenous compound is urea, is that cyanogen ammonification sodium, cyanogen ammonification potassium, sodium cyanide, potassium cyanide etc. are containing cyanogen compound containing cyanogen compound.
The bimetal bellow-type expansion joint of the inventive method process is with contrast 1 (common bellow-type expansion joint) and contrast 2 (bilayer structure bellow-type expansion joints, and the infiltration of internal layer inner surface of tube body has the carbonitrided case that one deck 0.03-0.06mm is thick) carry out performance parameter comparison, from Young's modulus, bimetal bellow-type expansion joint of the present invention is less than 100GPa, the Young's modulus of contrast 1 is that 190GPa is even more than 190GPa, the Young's modulus of documents 2 is about 120GPa, Young's modulus in the present invention is significantly less than contrast 1 and contrast 2, namely when produced deflection is identical, the power applied existing bellow-type expansion joint is less than to the power that bellow-type expansion joint in the present invention applies, reduce difficulty of processing, from hardness, bimetal bellow-type expansion joint of the present invention reaches 68-72HRC, and even higher than 72HRC, the hardness of contrast 1 is only at about 187HB, and the hardness of contrast 2 only reaches 60-65HRC, from erosion resistance, to contrast the erosion resistance of 1 for 1, contrast 2 is 6 relative to the erosion resistance of contrast 1, and the present invention is 8-9 relative to the erosion resistance of contrast 1, from wear resistance, for contrast 1 wear resistance for 1, contrast 2 is 4 relative to the wear resistance of contrast 1, and the present invention is 6-7 relative to the wear resistance of contrast 1, from yield strength, bimetal bellow-type expansion joint yield strength of the present invention reaches 318-324MPa, and even on it, contrast 1 reaches about 205MPa, and contrast 2 reaches about 290MPa, visible hardness of the present invention, erosion resistance, wear resistance, yield strength are all much larger than contrast 1 and contrast 2, it can thus be appreciated that bimetal bellow-type expansion joint of the present invention has excellent erosion resistance, wear resistance, and its also to have fatigue resistance large, toughness and ductility high.
Claims (4)
1. a corrosion-resistant method for bimetal bellow-type expansion joint, is characterized in that, present method is made into the bimetal bellow-type expansion joint with internal layer and outer double-layer structure by adopting two or more metallic substance; Then bimetal bellow-type expansion joint is carried out drawing and forming, and the bimetal bellow-type expansion joint after stretching is carried out solution treatment, carrying out adding containing cyanogen compound and nitrogenous compound in solution treatment, making cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint; Increase the wall thickness of bellow-type expansion joint simultaneously, obtain corrosion resistant bimetal bellow-type expansion joint.
2. the corrosion-resistant method of a kind of bimetal bellow-type expansion joint according to claim 1, is characterized in that, described bimetal bellow-type expansion joint is made by following technique:
A, preparation pure iron plate and stainless steel plate are for subsequent use;
B, according to the girth of bellow-type expansion joint internal layer body cross section to be formed and the length of internal layer body, the pure iron plate got ready in steps A to be processed, obtain inner plating for subsequent use; According to the outer girth of body cross section of bellow-type expansion joint to be formed and the length of outer body, the stainless steel plate got ready in steps A is processed, obtain lamina rara externa for subsequent use;
C, the inner plating obtained in step B and lamina rara externa are welded into cylinder respectively, obtain internal layer body and outer body, then internal layer body and outer body are set in together, the cylinder be integrally fixed, pressing machine extrudes ripple, obtains bimetal bellow-type expansion joint.
3. the corrosion-resistant method of a kind of bimetal bellow-type expansion joint according to claim 1, it is characterized in that, the solution treatment of present method carries out in salt bath furnace, heat in the saline solution of the bellow-type expansion joint immersion salt bath furnace after drawing and forming, be added with containing cyanogen compound and nitrogenous compound in saline solution, bath salt temperature is 550-570 DEG C, makes cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint, then 0.8-1.2h is incubated, air cooling of coming out of the stove.
4. the corrosion-resistant method of a kind of bimetal bellow-type expansion joint according to claim 1, it is characterized in that, the solution treatment of present method carries out in salt bath furnace, heat in the saline solution of the bellow-type expansion joint immersion salt bath furnace after drawing and forming, be added with containing cyanogen compound and nitrogenous compound in saline solution, bath salt temperature is 560 DEG C, makes cyanogen element and nitrogen element penetrate in the matrix of bellow-type expansion joint, then 1h is incubated, air cooling of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930221.3A CN105463475B (en) | 2015-12-15 | 2015-12-15 | A kind of corrosion resistant etching method of bimetallic bellow-type expansion joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930221.3A CN105463475B (en) | 2015-12-15 | 2015-12-15 | A kind of corrosion resistant etching method of bimetallic bellow-type expansion joint |
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| CN105463475A true CN105463475A (en) | 2016-04-06 |
| CN105463475B CN105463475B (en) | 2018-08-21 |
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| CN201510930221.3A Expired - Fee Related CN105463475B (en) | 2015-12-15 | 2015-12-15 | A kind of corrosion resistant etching method of bimetallic bellow-type expansion joint |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409285A (en) * | 2011-11-25 | 2012-04-11 | 江苏海纳机电集团有限公司 | Low-temperature salt bath hardening treatment method for austenitic stainless steel |
| CN104006257A (en) * | 2014-06-05 | 2014-08-27 | 石家庄三环阀门股份有限公司 | Chloride ion corrosion-resistant expansion joint and manufacturing technique for corrugated pipe of expansion joint |
| CN104087892A (en) * | 2014-06-11 | 2014-10-08 | 威海久威材料科技有限公司 | Technical method for die steel surface nonmetallic ion infiltration |
| CN104264105A (en) * | 2014-09-12 | 2015-01-07 | 奥展实业有限公司 | Surface treatment method of precision screw |
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2015
- 2015-12-15 CN CN201510930221.3A patent/CN105463475B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409285A (en) * | 2011-11-25 | 2012-04-11 | 江苏海纳机电集团有限公司 | Low-temperature salt bath hardening treatment method for austenitic stainless steel |
| CN104006257A (en) * | 2014-06-05 | 2014-08-27 | 石家庄三环阀门股份有限公司 | Chloride ion corrosion-resistant expansion joint and manufacturing technique for corrugated pipe of expansion joint |
| CN104087892A (en) * | 2014-06-11 | 2014-10-08 | 威海久威材料科技有限公司 | Technical method for die steel surface nonmetallic ion infiltration |
| CN104264105A (en) * | 2014-09-12 | 2015-01-07 | 奥展实业有限公司 | Surface treatment method of precision screw |
Non-Patent Citations (1)
| Title |
|---|
| 唐殿福: "《热处理技术 上》", 28 February 2015, 沈阳：辽宁科学技术出版社 * |
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Granted publication date: 20180821 Termination date: 20211215 |