CN110592640A - Stainless steel surface corrosion-resistant treatment system and treatment method adopting same - Google Patents
Stainless steel surface corrosion-resistant treatment system and treatment method adopting same Download PDFInfo
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- CN110592640A CN110592640A CN201910973290.0A CN201910973290A CN110592640A CN 110592640 A CN110592640 A CN 110592640A CN 201910973290 A CN201910973290 A CN 201910973290A CN 110592640 A CN110592640 A CN 110592640A
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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
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a stainless steel surface corrosion-resistant treatment system which comprises a cold roll, a cleaning box, an acid tank and a muffle furnace which are sequentially arranged according to the sequence of stations, wherein a manipulator for transferring is arranged between the adjacent stations; the acid tank comprises an acid tank body, a first storage box with a first infusion tube and a second storage box with a second infusion tube are arranged at the upper end of the acid tank body, the first infusion tube and the second infusion tube are communicated with a mixing tube in the acid tank body, and a spray head is arranged at the lower end of the mixing tube. Also discloses a corrosion-resistant treatment method for the surface of stainless steel. The invention uses the method of combining acid cleaning passivation and electrochemical passivation to establish a film layer with excellent corrosion resistance and oxidation resistance on the surface of the stainless steel, and the stability is good; the process is simple and controllable, the production efficiency is high, a surface coating production line does not need to be additionally arranged, and the production cost is greatly saved.
Description
Technical Field
The invention relates to the field of stainless steel surface treatment, in particular to a stainless steel surface corrosion-resistant treatment system and a treatment method adopting the same.
Background
Stainless steel is a typical corrosion resistant alloy, generally referred to as an iron based alloy containing 12% to 30% chromium. The stainless steel has excellent comprehensive performance, corrosion resistance, wear resistance, exquisite appearance, mechanical property and processability, is widely applied to various fields of national defense, aviation, chemical industry, petrifaction, metallurgy, ocean, machinery, traffic, construction, light industry, food, medical treatment, daily life and the like, and plays an important role in national economy.
However, stainless steel "stainless" is only "relatively stainless". High corrosion resistance of stainless steel is still highly challenging and threatened under various harsh conditions. According to incomplete statistics, 25% of stainless steel equipment products are corroded and damaged every year in China. This not only causes huge economic loss, causes the waste of valuable resources and energy greatly, and often leads to a series of catastrophic accidents such as shutdown, product quality reduction and personal injury, causing immeasurable loss.
Publication No. CN 107419259B discloses a surface passivation treatment process for a stainless steel part, which is characterized in that a certain thick and compact passivation film can be formed on the surface of the stainless steel part treated by adopting a prepared passivation solution, so that the corrosion reaction of the stainless steel is inhibited, and the corrosion resistance of the stainless steel part is improved. But the corrosion resistance is not obvious enough by only carrying out corrosion resistance treatment by a single means, thereby influencing the use effect and the service life of the steel.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to greatly improve the corrosion resistance of the stainless steel surface.
In order to achieve the purpose, the invention provides the following technical scheme:
a stainless steel surface corrosion-resistant treatment system comprises a cold roll, a cleaning box, an acid tank and a muffle furnace which are sequentially arranged according to the sequence of stations, wherein a manipulator for transferring is arranged between adjacent stations; the acid tank comprises an acid tank body, a first storage box with a first infusion tube and a second storage box with a second infusion tube are arranged at the upper end of the acid tank body, the first infusion tube and the second infusion tube are both communicated with a mixing tube in the acid tank body, and a spray head is arranged at the lower end of the mixing tube; a wedge-shaped table is arranged in the acid tank body right below the spray head, an inclined plane is arranged on one side of the wedge-shaped table, and a cavity between the inclined plane and the inner wall of the acid tank body forms an acid tank; a guide rail is arranged on the inclined surface, a sliding block matched with the guide rail is arranged on the guide rail, and a first clamp used for clamping stainless steel is fixedly arranged on the sliding block; the electrochemical workstation is electrically connected with a reference electrode, a static contact and a counter electrode in the acid tank, and the static contact can be abutted against stainless steel when the sliding block is positioned at the low position of the guide rail. The acid tank can simultaneously carry out primary pickling passivation, secondary pickling passivation and electrochemical passivation on stainless steel, and a film with excellent corrosion resistance and oxidation resistance is established, so that the stability of the acid tank is good.
Preferably, the side wall of the acid tank body is provided with a fixing bracket for fixing the spray head.
Preferably, the counter electrode is a titanium alloy plate.
Preferably, the top of the acid tank body is provided with an air cylinder, and the end part of a piston rod of the air cylinder is provided with a second clamp for clamping a counter electrode.
Preferably, a liquid discharge pipe with a valve is arranged at the bottom of the pool.
Also discloses a stainless steel surface corrosion-resistant treatment method, which comprises the following steps:
1) rolling by using a roller with the roughness Ra of 2-3um, and controlling the cold rolling reduction rate to be 5-10%;
2) carrying out ultrasonic cleaning treatment on the cold-rolled stainless steel, then cleaning with water, and drying for later use;
3) pickling the cleaned stainless steel, wherein the acid liquor in the acid tank has the ratio of 10-25g/L HF concentration and 80-200g/L HN03 concentration, and the pickling and passivating temperature is controlled at 40-60 ℃; the stainless steel is subjected to surface passivation treatment by acid washing with acid liquor in an acid tank, so that the corrosion resistance is improved.
4) A three-electrode working mode is adopted, and electrochemical passivation treatment is realized on stainless steel in the acid tank through a reference electrode and a counter electrode; further improving the corrosion resistance.
5) And putting the stainless steel into a muffle furnace, heating to 100-500 ℃, keeping the temperature for 1-3h, and naturally cooling to room temperature to finish the corrosion-resistant and oxidation-resistant treatment of the surface of the stainless steel.
Preferably, the washing time of step 2) is 5-10 min.
Preferably, the acid solution in the acid tank in the step 3) has the mixture ratio of 15g/L HF concentration and 150g/L HN03 concentration, and the acid washing passivation temperature is controlled at 60 ℃.
Preferably, the potential value controlled by the polarization treatment of the stainless steel in the step 4) is 1.0-1.7V, and the polarization time is 200 s.
Preferably, the temperature in the step 5) is raised to 320 ℃, and the temperature is kept for 2 hours and the temperature is naturally cooled to the room temperature.
Compared with the prior art, the invention has the beneficial effects that: a film layer with excellent corrosion resistance and oxidation resistance is established on the surface of the stainless steel by a method combining pickling passivation and electrochemical passivation, and the stability is good; the process is simple and controllable, the production efficiency is high, a surface coating production line does not need to be additionally arranged, and the production cost is greatly saved.
Drawings
FIG. 1 is a schematic structural diagram of an acid tank according to the first embodiment.
FIG. 2 is a flow chart of a corrosion-resistant treatment method for a stainless steel surface according to an embodiment I.
In the figure: 1-an acid tank body, 2-a first storage tank, 21-a first infusion tube, 3-a second storage tank, 31-a second infusion tube, 4-a mixing tube, 41-a spray head, 42-a fixed support, 5-a wedge-shaped table, 51-a guide rail, 52-a slide block, 53-a first clamp, 6-an electrochemical workstation, 61-a reference electrode, 62-a static contact, 63-a counter electrode, 64-a cylinder, 65-a second clamp and 7-a liquid discharge tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in figure 1, the stainless steel surface corrosion-resistant treatment system comprises a cold roll, a cleaning box, an acid tank and a muffle furnace which are sequentially arranged according to the sequence of stations, wherein a manipulator for transferring is arranged between the adjacent stations; the acid tank comprises an acid tank body 1, a first storage box 2 with a first infusion tube 21 and a second storage box 3 with a second infusion tube 31 are arranged at the upper end of the acid tank body 1, the first infusion tube 21 and the second infusion tube 31 are both communicated with a mixing tube 4 in the acid tank body 1, and a spray head 41 is arranged at the lower end of the mixing tube 4; a wedge-shaped table 5 is arranged in the acid tank body 1 right below the spray head 41, an inclined surface is arranged on one side of the wedge-shaped table 5, and a cavity between the inclined surface and the inner wall of the acid tank body 1 forms an acid pool; a guide rail 51 is arranged on the inclined surface, a sliding block 52 matched with the guide rail 51 is arranged on the guide rail 51, and a first clamp 53 for clamping stainless steel is fixedly arranged on the sliding block 52; the electrochemical working station 6 is electrically connected with a reference electrode 61, a static contact 62 and a counter electrode 63 in the acid tank, and the static contact 62 can be abutted against stainless steel when the sliding block 52 is positioned at the lower position of the guide rail 51. The acid tank can simultaneously carry out primary pickling passivation, secondary pickling passivation and electrochemical passivation on stainless steel, and a film with excellent corrosion resistance and oxidation resistance is established, so that the stability of the acid tank is good.
The processing method comprises the following steps as shown in figure 2
1) Rolling by adopting a roller with the roughness Ra of 2um, and controlling the cold rolling reduction rate to be 10%;
2) carrying out ultrasonic cleaning treatment on the cold-rolled stainless steel, then cleaning with water, and drying for later use;
3) pickling the cleaned stainless steel, wherein the acid liquor in the acid tank is prepared from 15g/L HF and 150g/L HN03, and the pickling and passivating temperature is controlled at 60 ℃;
4) a three-electrode working mode is adopted, and electrochemical passivation treatment is realized on stainless steel in the acid tank through a reference electrode and a counter electrode;
5) and (3) putting the stainless steel into a muffle furnace, heating to 320 ℃, keeping the temperature for 2 hours, and naturally cooling to room temperature to finish the corrosion-resistant and oxidation-resistant treatment of the surface of the stainless steel.
Example two:
the method is the same as the first embodiment except that the method comprises the following steps:
1) rolling by adopting a roller with the roughness Ra of 2um, and controlling the cold rolling reduction rate to be 7%;
2) carrying out ultrasonic cleaning treatment on the cold-rolled stainless steel, then cleaning with water, and drying for later use;
3) pickling the cleaned stainless steel, wherein the acid liquor in the acid tank is prepared from 15g/L HF and 150g/L HN03, and the pickling and passivating temperature is controlled at 40 ℃;
4) a three-electrode working mode is adopted, and electrochemical passivation treatment is realized on stainless steel in the acid tank through a reference electrode and a counter electrode;
5) and putting the stainless steel into a muffle furnace, heating to 250 ℃, keeping the temperature for 2 hours, and naturally cooling to room temperature to finish the corrosion-resistant and oxidation-resistant treatment of the surface of the stainless steel.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A stainless steel surface corrosion-resistant treatment system is characterized by comprising a cold roll, a cleaning box, an acid tank and a muffle furnace which are sequentially arranged according to the sequence of stations, wherein a manipulator for transferring is arranged between the adjacent stations; the acid tank comprises an acid tank body, a first storage box with a first infusion tube and a second storage box with a second infusion tube are arranged at the upper end of the acid tank body, the first infusion tube and the second infusion tube are both communicated with a mixing tube in the acid tank body, and a spray head is arranged at the lower end of the mixing tube; a wedge-shaped table is arranged in the acid tank body right below the spray head, an inclined plane is arranged on one side of the wedge-shaped table, and a cavity between the inclined plane and the inner wall of the acid tank body forms an acid tank; a guide rail is arranged on the inclined surface, a sliding block matched with the guide rail is arranged on the guide rail, and a first clamp used for clamping stainless steel is fixedly arranged on the sliding block; the electrochemical workstation is electrically connected with a reference electrode, a static contact and a counter electrode in the acid tank, and the static contact can be abutted against stainless steel when the sliding block is positioned at the low position of the guide rail.
2. The stainless steel surface corrosion resistance treatment system according to claim 1, wherein the side wall of the acid tank body is provided with a fixing bracket for fixing the spray head.
3. The system of claim 1, wherein the counter electrode is a titanium alloy plate.
4. The stainless steel surface corrosion resistance treatment system according to claim 1, wherein a cylinder is arranged at the top of the acid tank body, and a second clamp for clamping the counter electrode is arranged at the end of a piston rod of the cylinder.
5. The system of claim 1, wherein a drain pipe with a valve is arranged at the bottom of the pool.
6. A method of treating a stainless steel surface using the corrosion-resistant treatment system of any one of claims 1 to 5, comprising the steps of:
1) rolling by using a roller with the roughness Ra of 2-3um, and controlling the cold rolling reduction rate to be 5-10%;
2) carrying out ultrasonic cleaning treatment on the cold-rolled stainless steel, then cleaning with water, and drying for later use;
3) pickling the cleaned stainless steel, wherein the acid liquor in the acid tank has the ratio of 10-25g/L HF concentration and 80-200g/L HN03 concentration, and the pickling and passivating temperature is controlled at 40-60 ℃;
4) a three-electrode working mode is adopted, and electrochemical passivation treatment is realized on stainless steel in the acid tank through a reference electrode and a counter electrode;
5) and putting the stainless steel into a muffle furnace, heating to 100-500 ℃, keeping the temperature for 1-3h, and naturally cooling to room temperature to finish the corrosion-resistant and oxidation-resistant treatment of the surface of the stainless steel.
7. The method for treating the stainless steel surface by using the corrosion-resistant treatment system for the stainless steel surface according to claim 6, wherein the cleaning time in the step 2) is 5-10 min.
8. The method for treating the stainless steel surface by using the corrosion-resistant treatment system of claim 6, wherein the furnace temperature of the annealing furnace in the step 3) is 350 ℃, the acid solution in the acid tank has the composition of 15g/L HF concentration and 150g/L HN03 concentration, and the acid-washing passivation temperature is controlled at 60 ℃.
9. The method for treating the surface of the stainless steel by using the corrosion-resistant treatment system for the stainless steel according to claim 6, wherein the potential value controlled by the polarization treatment of the stainless steel in the step 4) is 1.0 to 1.7V, and the polarization time is 200 s.
10. The method for treating the stainless steel surface by using the corrosion-resistant treatment system for the stainless steel surface according to claim 6, wherein the temperature in the step 5) is increased to 320 ℃, and the temperature is kept constant for 2 hours and then the stainless steel surface is naturally cooled to the room temperature.
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| CN209178490U (en) * | 2018-10-31 | 2019-07-30 | 广州广钢新材料股份有限公司 | A kind of acid washing rolled steel slot |
| CN211284553U (en) * | 2019-11-20 | 2020-08-18 | 无锡金卫星实业有限公司 | Surface treatment device for improving corrosion resistance of electrolytic copper surface |
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Application publication date: 20191220 |