CN109321928A - A kind of super austenitic stainless steel volume continuous acid-washing method - Google Patents
A kind of super austenitic stainless steel volume continuous acid-washing method Download PDFInfo
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- CN109321928A CN109321928A CN201811411202.XA CN201811411202A CN109321928A CN 109321928 A CN109321928 A CN 109321928A CN 201811411202 A CN201811411202 A CN 201811411202A CN 109321928 A CN109321928 A CN 109321928A
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/028—Associated apparatus, e.g. for pretreating or after-treating for thermal or mechanical pretreatment
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of super austenitic stainless steels to roll up continuous acid-washing method, the following steps are included: pretreatment: the stainless-steel roll after the 5-10min that anneals is carried out ball blast work by coil of strip shot-blasting machine, the ramming head revolving speed of the shot-blasting machine is that 1500-1800 turns/min, continues 2-5min；Prerinse: stainless-steel roll is spread across into the interior precleaning spout equipped with the desalted water that flow velocity is 1-5m/s, continues 2-6min；Pre- pickling: pre- descaling bath will be passed through by prewashed stainless-steel roll.The present invention is by carrying out ball blast and desalination water pretreatment to the stainless-steel roll after annealing, enliven surface oxide layer, convenient for subsequent removing, by pre- pickling solution and again pickling solution to stainless-steel roll carry out continuous acid-washing, it is shaken by oxidation film of the ultrasonic wave to stainless-steel roll surface in acid cleaning process, keeps oxidation film soft, removed convenient for the pickling of oxidation film, by the effect of nitric acid and pickling additive while oxidation film is dissolved in pickling, avoids dissolution and excessively or excessively inhale hydrogen.
Description
Technical field
The present invention relates to super austenitic stainless steel volume technical fields more particularly to a kind of super austenitic stainless steel volume to connect
Continuous acid washing method.
Background technique
Super austenitic stainless steel is a kind of stainless steel of special type, first in chemical component not with common stainless steel 304
Together, refer to containing nickelic, Gao Ge, a kind of high-alloy stainless steel of high molybdenum.Secondly in high temperature resistant or corrosion resistant performance, with
304 compare, and have more outstanding high temperature resistant or corrosion resistance, are 304 not replace.In addition, from point of stainless steel
In class, the metallographic structure of special stainless steel is a kind of stable austenite metallographic structure.
Due in the ingredient of super austenitic stainless steel contain a large amount of nickel, when nickel content is increased to it is a certain amount of when, oxidation
The extremely difficult destruction of film, and repair ability is extremely strong, both molybdenum and nickel combine, and are remarkably improved the stability of oxidation film, are carrying out pickling
Shi Buyi removes oxidation film.
Thus it is proposed that a kind of super austenitic stainless steel rolls up continuous acid-washing method.
Summary of the invention
The purpose of the present invention is to solve the problems in background techniques, and a kind of super austenitic stainless steel volume proposed
Continuous acid-washing method.
To achieve the goals above, present invention employs following technical solutions: a kind of super austenitic stainless steel volume is continuous
Acid washing method, comprising the following steps:
Pretreatment: the stainless-steel roll after the 5-10min that anneals is subjected to ball blast work, the throwing of the shot-blasting machine by coil of strip shot-blasting machine
Head revolving speed is that 1500-1800 turns/min, continues 2-5min；
Prerinse: stainless-steel roll is spread across into the interior precleaning spout equipped with the desalted water that flow velocity is 1-5m/s, continues 2-6min；
Pre- pickling: pre- descaling bath will be passed through by prewashed stainless-steel roll, it is 70-90 that temperature is filled in the pre- descaling bath
DEG C pre- pickling solution, continue 10-20min；
Pickling again: by the stainless-steel roll Jing Guo pre- pickling by descaling bath again, the interior temperature that is filled with of the descaling bath again is 20-45
DEG C pickling solution again and pickling additive, continue 1-5min；
Final cleaning: will be imported by the stainless-steel roll of descaling bath again two be respectively provided with cold water that temperature is -2-5 DEG C and
The rinsing bowl of 40-70 DEG C of hot water, duration 1-4min；
Drying: upper and lower surface is carried out to by the stainless-steel roll of rinsing bowl by the air-heater that revolving speed is 100-300 turns/min
Drying work, duration 3-7min；
Winding: being the winding that 50-200 turns/min coiling machine carries out stainless-steel roll by revolving speed.
Preferably, the temperature of the desalted water is 30-50 DEG C, and the salt content of the desalted water is 1-3 mg/litre.
Preferably, the pre- pickling solution is the sulfuric acid liquid that concentration is 250-300g/L.
Preferably, the pickling solution again is the mixed liquor of hydrofluoric acid and nitric acid, and the accounting of the hydrofluoric acid is 2-5%/L, institute
The accounting for stating nitric acid is 15-20%/L, and the mass fraction of the hydrofluoric acid is 35-45%, and the mass fraction of the nitric acid is 55-
65%。
Preferably, the pre- descaling bath and to be respectively and fixedly provided with revolving speed on the outer wall of descaling bath again be that 1000-1500 turns/min
Acid-proof pump.
Preferably, the pre- descaling bath and on the outer wall of descaling bath it is respectively and fixedly provided with supersonic generator again.
Compared with prior art, the advantages of this super austenitic stainless steel volume continuous acid-washing method, is:
1, ball blast work is carried out to stainless-steel roll by shot-blasting machine, bump is reinforced workpiece surface, forces stainless-steel roll table
Face and surface layer oxide film change in cyclicity deformation process, and microstructure is modified, outside flow heterogeneous
Surface layer introduces residual compressive stress, and endosexine produces residual tension, eliminates or enliven oxidation film, while passing through desalted water pair
Oxidation film carries out ion exchange, avoids and continues fouling or corrosion；
2, stainless-steel roll carries out reaction removal to the oxidation film on surface by hydrofluoric acid and sulfuric acid, then pass through by pre- descaling bath
Descaling bath again, hydrofluoric acid are a kind of reducing agents, play the role of leveling, and nitric acid is a kind of oxidant, play oxidation, prevent stainless
Steel surface dissolution excessively with suction hydrogen, is played the role of bright；
3, by the stainless-steel roll after continuous acid-washing pass through rinsing bowl, by washing removal remained on surface acid, by air-heater into
It is wound after row drying by coiling machine；
4, supersonic generator is set on pre- descaling bath and the again outer wall of descaling bath simultaneously, by ultrasonic wave to stainless-steel roll table
The oxidation film in face is shaken in acid cleaning process, keeps oxidation film soft, is removed convenient for the pickling of oxidation film；
In conclusion the present invention makes surface oxidation by carrying out ball blast and desalination water pretreatment to the stainless-steel roll after annealing
Layer is active, is convenient for subsequent removing, and pickling solution carries out continuous acid-washing to stainless-steel roll by pre- pickling solution and again, passes through ultrasonic wave
The oxidation film on stainless-steel roll surface is shaken in acid cleaning process, keeps oxidation film soft, is removed convenient for the pickling of oxidation film, acid
Effect while dissolving oxidation film by nitric acid and pickling additive is washed, dissolution is avoided and excessively or excessively inhales hydrogen.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment one
A kind of super austenitic stainless steel volume continuous acid-washing method, comprising the following steps:
Pretreatment: the stainless-steel roll after the 5-10min that anneals is subjected to ball blast work by coil of strip shot-blasting machine, the ramming head of shot-blasting machine turns
Speed is that 1500-1800 turns/min, continues 2-5min；
By shot-blasting machine drive stainless-steel roll movement, workpiece surface is reinforced by bump, force stainless-steel roll surface and
Surface layer oxide film changes in cyclicity deformation process, and microstructure is modified, flow extexine heterogeneous
Residual compressive stress is introduced, endosexine produces residual tension, eliminates or enliven oxidation film.
Prerinse: stainless-steel roll is spread across into the interior precleaning spout equipped with the desalted water that flow velocity is 1-5m/s, continues 2-
6min, the temperature of desalted water are 30-50 DEG C, and the salt content of desalted water is 1-3 mg/litre, are carried out by desalted water to oxidation film
Cation and anion exchange avoids the continuation fouling or corrosion on stainless-steel roll surface.
Pre- pickling: pre- descaling bath will be passed through by prewashed stainless-steel roll, it is 70-90 that temperature is filled in pre- descaling bath
DEG C pre- pickling solution, continue 10-20min, pre- pickling solution is the sulfuric acid liquid that concentration is 250-300g/L, accelerates sulfuric acid and oxidation film
Reaction process.
Pickling again: by the stainless-steel roll Jing Guo pre- pickling by being filled with temperature in descaling bath again, then descaling bath as 20-45
DEG C pickling solution again and pickling additive, continue 1-5min, then pickling solution is the mixed liquor of hydrofluoric acid and nitric acid, hydrofluoric acid accounts for
Than being 15-20%/L for the accounting of 2-5%/L, nitric acid, the mass fraction of hydrofluoric acid is 35-45%, and the mass fraction of nitric acid is 55-
65%, hydrofluoric acid is a kind of reducing agent, can be restored to the oxidation film on stainless-steel roll surface, and leveling is played the role of, and nitric acid is one
Kind of oxidant plays oxidation, prevents stainless steel surface dissolution excessively and inhales hydrogen, plays the role of bright, while avoiding excessive suction
Hydrogen causes material itself to become fragile.
Pickling additive is used for the pickling of stainless steel oxidation skin, because of oxide skin compact structure existing for stainless steel surface,
It is strong with matrix adhesive force, it has to remove before the processing of the decorations such as passivation, plating, coloring afterwards clean.In stainless steel acid
During washing, cooperate its use, promotes the removing of various stainless steel black oxidation skins, silicate scale, slow down to metallic matrix
Corrosion, while inhibiting the generation of acid mist, pickling additive under normal use substantially reduces the rate of corrosion of stainless steel, and has
Excellent inhibition stainless steel inhales the ability of hydrogen in acid cleaning process, avoids stainless steel that " hydrogen embrittlement " occurs, while inhibiting acid cleaning process
Middle Fe3+ makes stainless steel that Cavitations not occur corrosion of metal, while pickling additive is usually wetting agent and emulsifier
Equal surface reactive materials, these materials are added in pickling solution, and they can reduce the surface tension of pickling solution, and preferably
Wet steel wire surface, to play the role of accelerating steel wire acid cleaning process.
The acid-proof pump that revolving speed is 1000-1500 turns/min is respectively and fixedly provided on the outer wall of pre- descaling bath and again descaling bath.
Final cleaning: will be imported by the stainless-steel roll of descaling bath again two be respectively provided with the cold water that temperature is -2-5 DEG C with
And the rinsing bowl of 40-70 DEG C of hot water, duration 1-4min；
Drying: upper and lower surface is carried out to by the stainless-steel roll of rinsing bowl by the air-heater that revolving speed is 100-300 turns/min
Drying work, duration 3-7min；
Winding: being the winding that 50-200 turns/min coiling machine carries out stainless-steel roll by revolving speed.
Time of the stainless-steel roll in first pre- descaling bath should guarantee sufficiently to react oxidation film in 10-20min,
The time should avoid overpickling in 1-5min in descaling bath again, keep stainless-steel roll impaired, pass through hydrofluoric acid, nitric acid and pickling
Additive flattens stainless steel surface in pickling, bright and passivation, forms protective film, and passivation refers to metal through aoxidizing
Property media processes after, etch ratio it is original it is untreated before the phenomenon that being decreased significantly, film mainly can be used in PASSIVATION MECHANISM
Theory explains, that is, think passivation be since metal and Oxidant act on, when effect metal surface generate it is a kind of very
It is thin, fine and close, covering performance is good, can firmly attached passivating film on the metal surface, prevent stainless-steel roll further
Oxidation, by circulating by acid-proof pump to pickling solution during pickling, ensure that pre- descaling bath and pickling again
The concentration of the contact position acid solution of mixed liquor and stainless-steel roll in slot, avoids irony from accumulating, and accelerates pickling process.
After the completion of stainless-steel roll pickling, by washing, the acid solution on stainless-steel roll surface is removed, when washing answers first cold water to rush
It washes, impregnate, reusable heat water rinses, and washing preferably carries out in the flowing water, and avoid molysite, acid accumulation from causing not washing clean clearly,
Using two service sinks, cleaning effect is more preferable, avoids acid solution adhesive tape, avoids the further pickling of stainless-steel roll impaired, passes through later
Hot wind dries the upper and lower surface of stainless-steel roll, then is wound with coiling machine.
Embodiment two
A kind of super austenitic stainless steel volume continuous acid-washing method, comprising the following steps:
Pretreatment: the stainless-steel roll after the 5-10min that anneals is subjected to ball blast work by coil of strip shot-blasting machine, the ramming head of shot-blasting machine turns
Speed is that 1500-1800 turns/min, continues 2-5min；
Prerinse: spreading across the interior precleaning spout equipped with the desalted water that flow velocity is 1-5m/s for stainless-steel roll, continue 2-6min,
The temperature of desalted water is 30-50 DEG C, and the salt content of desalted water is 1-3 mg/litre；
Pre- pickling: pre- descaling bath will be passed through by prewashed stainless-steel roll, it is 70-90 DEG C that temperature is filled in pre- descaling bath
Pre- pickling solution continues 10-20min, and pre- pickling solution is the sulfuric acid liquid that concentration is 250-300g/L；
Pickling again: by the stainless-steel roll Jing Guo pre- pickling by being filled with temperature in descaling bath again, then descaling bath as 20-45 DEG C
Pickling solution and pickling additive again continue 1-5min, then pickling solution is the mixed liquor of hydrofluoric acid and nitric acid, and the accounting of hydrofluoric acid is
2-5%/L, the accounting of nitric acid are 15-20%/L, and the mass fraction of hydrofluoric acid is 35-45%, and the mass fraction of nitric acid is 55-65%；
Final cleaning: will be imported by the stainless-steel roll of descaling bath again two be respectively provided with cold water that temperature is -2-5 DEG C and
The rinsing bowl of 40-70 DEG C of hot water, duration 1-4min；
Drying: upper and lower surface is carried out to by the stainless-steel roll of rinsing bowl by the air-heater that revolving speed is 100-300 turns/min
Drying work, duration 3-7min.
Supersonic generator is respectively and fixedly provided on the outer wall of pre- descaling bath and again descaling bath.
The places different from embodiment one are: ultrasonic wave is arranged on pre- descaling bath and the again outer wall of descaling bath
The acid-proof pump on pre- descaling bath and the again outer wall of descaling bath, when ultrasonic wave is propagated in the medium, medium particle vibration is substituted in device
Frequency it is very high, thus energy is very big, is shaken to the oxidation film on stainless-steel roll surface in acid cleaning process by ultrasonic wave, makes
Oxidation film is soft, at the same increase pre- descaling bath and again in descaling bath mixed liquor and oxidation film contact area, accelerate reaction, just
It is removed in the pickling of oxidation film, accelerates pickling and subsequent plated film passivation process.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of super austenitic stainless steel rolls up continuous acid-washing method, which comprises the following steps:
Pretreatment: the stainless-steel roll after the 5-10min that anneals is subjected to ball blast work, the throwing of the shot-blasting machine by coil of strip shot-blasting machine
Head revolving speed is that 1500-1800 turns/min, continues 2-5min；
Prerinse: stainless-steel roll is spread across into the interior precleaning spout equipped with the desalted water that flow velocity is 1-5m/s, continues 2-6min；
Pre- pickling: pre- descaling bath will be passed through by prewashed stainless-steel roll, it is 70-90 that temperature is filled in the pre- descaling bath
DEG C pre- pickling solution, continue 10-20min；
Pickling again: by the stainless-steel roll Jing Guo pre- pickling by descaling bath again, the interior temperature that is filled with of the descaling bath again is 20-45
DEG C pickling solution again and pickling additive, continue 1-5min；
Final cleaning: will be imported by the stainless-steel roll of descaling bath again two be respectively provided with cold water that temperature is -2-5 DEG C and
The rinsing bowl of 40-70 DEG C of hot water, duration 1-4min；
Drying: upper and lower surface is carried out to by the stainless-steel roll of rinsing bowl by the air-heater that revolving speed is 100-300 turns/min
Drying work, duration 3-7min；
Winding: being the winding that 50-200 turns/min coiling machine carries out stainless-steel roll by revolving speed.
2. a kind of super austenitic stainless steel according to claim 1 rolls up continuous acid-washing method, which is characterized in that described de-
The temperature of salt water is 30-50 DEG C, and the salt content of the desalted water is 1-3 mg/litre.
3. a kind of super austenitic stainless steel according to claim 1 or 2 rolls up continuous acid-washing method, which is characterized in that institute
Stating pre- pickling solution is the sulfuric acid liquid that concentration is 250-300g/L.
4. a kind of super austenitic stainless steel according to claim 1-3 rolls up continuous acid-washing method, feature exists
In the pickling solution again is the mixed liquor of hydrofluoric acid and nitric acid, and the accounting of the hydrofluoric acid is 2-5%/L, the accounting of the nitric acid
For 15-20%/L, the mass fraction of the hydrofluoric acid is 35-45%, and the mass fraction of the nitric acid is 55-65%.
5. a kind of super austenitic stainless steel according to claim 1 rolls up continuous acid-washing method, which is characterized in that described pre-
The acid-proof pump that revolving speed is 1000-1500 turns/min is respectively and fixedly provided on the outer wall of descaling bath and again descaling bath.
6. a kind of super austenitic stainless steel according to claim 1 rolls up continuous acid-washing method, which is characterized in that described pre-
Supersonic generator is respectively and fixedly provided on the outer wall of descaling bath and again descaling bath.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110747407A (en) * | 2019-11-19 | 2020-02-04 | 浦项(张家港)不锈钢股份有限公司 | Austenitic stainless steel for preparing fork spoon and manufacturing method and application thereof |
| CN112962104A (en) * | 2021-02-02 | 2021-06-15 | 乐普（北京）医疗器械股份有限公司 | Method for removing laser processing slag on metal surface and application |
| CN114214631A (en) * | 2021-12-20 | 2022-03-22 | 太原科技大学 | Acid pickling process of austenitic iron-nickel-based alloy welded pipe |
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| CN110747407A (en) * | 2019-11-19 | 2020-02-04 | 浦项(张家港)不锈钢股份有限公司 | Austenitic stainless steel for preparing fork spoon and manufacturing method and application thereof |
| CN112962104A (en) * | 2021-02-02 | 2021-06-15 | 乐普（北京）医疗器械股份有限公司 | Method for removing laser processing slag on metal surface and application |
| CN114214631A (en) * | 2021-12-20 | 2022-03-22 | 太原科技大学 | Acid pickling process of austenitic iron-nickel-based alloy welded pipe |
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