CN112376110A - Waste judgment and repair process in production process of chromium-electroplated steel strip - Google Patents
Waste judgment and repair process in production process of chromium-electroplated steel strip Download PDFInfo
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- CN112376110A CN112376110A CN202011207135.7A CN202011207135A CN112376110A CN 112376110 A CN112376110 A CN 112376110A CN 202011207135 A CN202011207135 A CN 202011207135A CN 112376110 A CN112376110 A CN 112376110A
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- steel strip
- chromium
- steel
- electroplating
- rolling
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a waste judgment and repair process in a production process of an electroplated chromium steel strip, which comprises the following operation steps of: s1: carrying out electrolytic stripping on the chromium coating on the surface of the poor steel strip; s2: the steel strip with the chromium coating stripped is rolled again by the cold rolling process; s3: cleaning the surface of the cold-rolled steel strip through an alkali liquor degreasing process; s4: the steel strip after cold rolling is subjected to annealing treatment to ensure that the surface of the steel strip is clean and bright due to the fact that steel matrix grains are broken; s5: the annealed steel strip is rolled again under a light rolling reduction to obtain a more flat plate shape effect; s6: drawing the flattened steel strip in the length direction through a straightening and withdrawing process, so that the steel strip is more straight, and a substrate coil stock suitable for electroplating is obtained; s7: and electroplating the steel strip again, and uniformly depositing metal chromium ions on the surface of the steel strip through electrolysis to form a protective layer. The invention relates to a waste judgment and repair process in the production process of an electroplated chromium steel strip, which is a way for reusing resources in the electroplating tinplate industry.
Description
Technical Field
The invention relates to the field of processing of plain carbon steel strips, in particular to a waste judgment and repair process in a production process of an electro-chromic steel strip.
Background
In the existing chrome electroplating production in the tinplate industry, steel strip surface flaws appear in the cold rolling substrate process or the chrome electroplating process, the flaws seriously affect the attractiveness of subsequent coating patterns or the poor compactness, adhesion and corrosion resistance of a coating layer, and the steel strip is rejected so as to cause waste of steel resources; in addition, the waste steel strips basically flow into the low-end market of metal packaging according to defective products, which is profit loss for tinplate manufacturers and brings low-quality influence for the downstream packaging industry. If the steel strips with the surface defects can be subjected to the removal of the chromium coating on the surface, the reworking and recycling of the waste steel strips are realized by cold rolling, thinning and reworking again to remold the processing performance and the printing function of the steel strips, the recycling of steel resources can be realized, and the quality level of products can be improved.
Disclosure of Invention
The invention mainly aims to provide a waste judgment and repair process in the production process of an electro-chromic steel strip, which can effectively solve the problem of processing, repairing and recycling the waste judgment steel strip. In order to achieve the purpose, the invention adopts the technical scheme that: a waste judgment and repair process in the production process of an electroplated chromium steel strip comprises the following operation steps:
s1: carrying out electrolytic stripping on the chromium coating on the surface of the waste steel belt by applying the reversal principle of the composite plating line to the waste steel belt;
s2: the steel strip with the chromium coating stripped is rolled again by the cold rolling process again, and the thickness of the steel strip is proper as required;
s3: emulsion rolling oil and fine iron powder particles are remained on the surface of the cold-rolled steel strip, the surface of the steel strip is cleaned by an alkali degreasing process, and the tension steel strip is strictly rolled into a coil shape and tightly bound;
s4: the steel strip after cold rolling needs annealing treatment to recover steel matrix grains because the steel matrix grains are broken, and an all-hydrogen bright cover type annealing process is adopted to ensure that the surface of the steel strip is clean and bright;
s5: rolling the annealed steel strip at a light rolling reduction again, namely flatly eliminating a residual yield platform after the steel strip is annealed and obtaining a more flat plate shape effect;
s6: slight middle waves or edge waves generally exist in the flattened steel strip, and the steel strip needs to be drawn in the length direction through a straightening and withdrawing process, so that the steel strip is more straight, and a substrate coil suitable for electroplating is obtained;
s7: and electroplating the steel strip again, and uniformly depositing metal chromium ions on the surface of the steel strip by an electrolysis principle to form a protective layer so as to obtain the metal packaging material with certain corrosion resistance and excellent coating and printing adhesiveness.
Preferably, the plate current in the step S1 is 2000-6000A, and the current density is 12-36A/dm2。
Preferably, the rolling in the step S2 adopts six-roller reversible rolling, and the rolling passes are 1 to 4.
Preferably, the annealing heating temperature in the step S4 is 570-680 ℃, and the heating time is 9-18 h.
Further preferably, the flattening rolling reduction in the step S5 is 1 to 45%.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the waste steel judgment belt generated in the working procedure of the semi-finished product of the chromium-plated product or the product is repaired by using the existing working procedure equipment, so that the profit of the product is improved with a little increased repair cost.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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
A waste judgment and repair process in the production process of an electroplated chromium steel strip comprises the following operation steps:
s1: will judge the scrap steelThe strip uses the reversal principle of the composite plating line to carry out electrolytic stripping on the chromium coating on the surface of the waste steel strip. The degreasing fluid is electrolyte, and the current applied to the electrode plate is 2000-4000A (current density is 12-24A/dm)2) And the steel strip is a cathode, the chromium coating on the surface of the steel strip obtains electrons to precipitate chromium ions, so that the chromium coating is gradually stripped, and the aim of stripping is achieved. The steel strip is continuously deplated at the speed of 150 m/min in cooperation with different current intensities;
s2: the steel strip with the chromium coating stripped is rolled again by a cold rolling process, the steel strip reaches a proper thickness as required, a small amount of residual metal chromium on the surface of the steel strip after stripping brings different abrasion to a roller, the roller needs to be changed according to the color difference condition of the steel strip, six rollers are adopted for reversible rolling, and the rolling pass is 1-2 times;
| item | Oil concentration of No. 1 | 1#PH | 1 conductivity of | Iron powder | Saponification number | Stability of |
| Range of | (2.5～5％) | (5～6) | (≤600) | 300 | 180 | 5％ |
S3: emulsion rolling oil and fine iron powder particles are remained on the surface of the cold-rolled steel strip, the surface of the steel strip is cleaned by an alkali degreasing process, and the tension steel strip is strictly rolled into a coil shape and tightly bound;
s4: the steel strip after cold rolling needs annealing treatment to recover steel matrix grains because the steel matrix grains are broken, and the clean and bright surface of the steel strip is ensured by adopting an all-hydrogen bright cover type annealing process. The annealing temperature is reduced by about 10 ℃ in reference to the first annealing (the general annealing heating temperature is 650 ℃, the heating time is 18 hours), and meanwhile, the hydrogen flow is increased due to the color difference of the surface of the steel strip, so that the surface is ensured to be cleaner;
s5: rolling the annealed steel strip with a light rolling reduction again, namely flattening and eliminating a residual yield platform after annealing the steel strip and obtaining a more flat plate type effect, wherein the flattening rolling reduction is 25 percent generally, and the surface effect of a grinding grain smooth surface roller or laser texturing, electric spark texturing or shot blasting texturing roller is adopted to be matched according to the specific requirements of customers;
s6: slight middle waves or edge waves generally exist in the flattened steel strip, and the steel strip needs to be drawn in the length direction through a straightening and withdrawing process, so that the steel strip is more straight, and a substrate coil suitable for electroplating is obtained;
s7: electroplating the steel strip again, uniformly depositing metal chromium ions on the surface of the steel strip to form a protective layer by an electrolysis principle, increasing water quantity on the surface of the steel strip after chromium plating to wash and rinse, completely removing residual chromium plating solution on the surface, drying the steel strip by squeezing, and finally coating oil (coating DOS oil 3 mg/m)2) And rolling to obtain the metal packaging material with certain corrosion resistance and excellent coating and printing adhesion.
Example 2
A waste judgment and repair process in the production process of an electroplated chromium steel strip comprises the following operation steps:
s1: and (3) carrying out electrolytic stripping on the chromium coating on the surface of the waste steel belt by applying the reversal principle of the composite plating line. The degreasing fluid is electrolyte, and the current applied to the electrode plate is 3000-6000A (the current density is 18-36A/dm)2) And the steel strip is a cathode, the chromium coating on the surface of the steel strip obtains electrons to precipitate chromium ions, so that the chromium coating is gradually stripped, and the aim of stripping is achieved. The steel strip is continuously deplated at the speed of 220 m/min in cooperation with different current intensities;
s2: the steel strip with the chromium coating stripped is rolled again by a cold rolling process, the steel strip reaches a proper thickness as required, a small amount of residual metal chromium on the surface of the steel strip after stripping brings different abrasion to a roller, the roller needs to be changed according to the color difference condition of the steel strip, six rollers are adopted for reversible rolling, and the rolling passes are 1-4 times;
| item | Oil concentration of No. 2 | 2#PH | 2 conductivity of | Iron powder | Saponification number | Stability of |
| Range of | (4～6％) | (5～6) | (≤600) | 200 | 160 | 15％ |
S3: emulsion rolling oil and fine iron powder particles are remained on the surface of the cold-rolled steel strip, the surface of the steel strip is cleaned by an alkali degreasing process, and the tension steel strip is strictly rolled into a coil shape and tightly bound;
s4: the steel strip after cold rolling needs annealing treatment to recover steel matrix grains because the steel matrix grains are broken, and the clean and bright surface of the steel strip is ensured by adopting an all-hydrogen bright cover type annealing process. The annealing temperature is reduced by about 20 ℃ in reference to the first annealing (the general annealing heating temperature is 640 ℃, the heating time is 14 hours), and meanwhile, the hydrogen flow is increased due to the color difference of the surface of the steel strip, so that the surface is ensured to be cleaner;
s5: rolling the annealed steel strip with a light reduction again, namely flattening to eliminate a residual yield platform after annealing the steel strip and obtain a more flat plate type effect, wherein the flattening reduction is generally 30%, and the surface effect of a grinding grain smooth surface roller or laser texturing, electric spark texturing or shot blasting texturing roller is adopted to be matched according to the specific requirements of customers;
s6: slight middle waves or edge waves generally exist in the flattened steel strip, and the steel strip needs to be drawn in the length direction through a straightening and withdrawing process, so that the steel strip is more straight, and a substrate coil suitable for electroplating is obtained;
s7: electroplating the steel belt again, uniformly depositing metal chromium ions on the surface of the steel belt to form a protective layer by an electrolysis principle, increasing water quantity on the surface of the steel belt after chromium plating to wash and rinse, thoroughly removing residual chromium plating solution on the surface, drying the steel belt by squeezing, and finally coating oil (coating oil on the steel belt)DOS oil 5mg/m2) And rolling to obtain the metal packaging material with certain corrosion resistance and excellent coating and printing adhesion.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A waste judgment and repair process in the production process of an electroplated chromium steel strip is characterized by comprising the following steps: the method comprises the following operation steps:
s1: carrying out electrolytic stripping on the chromium coating on the surface of the waste steel belt by applying the reversal principle of the composite plating line to the waste steel belt;
s2: the steel strip with the chromium coating stripped is rolled again by the cold rolling process again, and the thickness of the steel strip is proper as required;
s3: emulsion rolling oil and fine iron powder particles are remained on the surface of the cold-rolled steel strip, the surface of the steel strip is cleaned by an alkali degreasing process, and the tension steel strip is strictly rolled into a coil shape and tightly bound;
s4: the steel strip after cold rolling needs annealing treatment to recover steel matrix grains because the steel matrix grains are broken, and an all-hydrogen bright cover type annealing process is adopted to ensure that the surface of the steel strip is clean and bright;
s5: rolling the annealed steel strip at a light rolling reduction again, namely flatly eliminating a residual yield platform after the steel strip is annealed and obtaining a more flat plate shape effect;
s6: slight middle waves or edge waves generally exist in the flattened steel strip, and the steel strip needs to be drawn in the length direction through a straightening and withdrawing process, so that the steel strip is more straight, and a substrate coil suitable for electroplating is obtained;
s7: and electroplating the steel strip again, and uniformly depositing metal chromium ions on the surface of the steel strip by an electrolysis principle to form a protective layer so as to obtain the metal packaging material with certain corrosion resistance and excellent coating and printing adhesiveness.
2. The chromium-electroplating judgment scrap steel belt repair processing technology as claimed in claim 1, which is characterized in that: in the step S1, the plate current is 2000-6000A, and the current density is 12-36A/dm2The steel strip is used as an anode, the polar plate is a relative cathode, and the chromium coating migrates under the action of electrons to realize coating stripping.
3. The chromium-electroplating judgment scrap steel belt repair processing technology as claimed in claim 1, which is characterized in that: in the step S2, six-roller reversible rolling is adopted for rolling, and the rolling passes are 1-4 times.
4. The chromium-electroplating judgment scrap steel belt repair processing technology as claimed in claim 1, which is characterized in that: in the step S4, the annealing heating temperature is 570-680 ℃, and the heating time is 9-18 h.
5. The chromium-electroplating judgment scrap steel belt repair processing technology as claimed in claim 1, which is characterized in that: in the step S5, the flattening rolling reduction is 1-45%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207135.7A CN112376110A (en) | 2020-11-03 | 2020-11-03 | Waste judgment and repair process in production process of chromium-electroplated steel strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011207135.7A CN112376110A (en) | 2020-11-03 | 2020-11-03 | Waste judgment and repair process in production process of chromium-electroplated steel strip |
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| CN112376110A true CN112376110A (en) | 2021-02-19 |
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| CN202011207135.7A Pending CN112376110A (en) | 2020-11-03 | 2020-11-03 | Waste judgment and repair process in production process of chromium-electroplated steel strip |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01234596A (en) * | 1988-03-15 | 1989-09-19 | Nippon Steel Corp | Electrolytic treatment of steel sheet plated with chromium |
| CN1193293A (en) * | 1996-03-15 | 1998-09-16 | 川崎制铁株式会社 | Ultra-thin steel sheet and mfg. method therefor |
| CN1356185A (en) * | 2001-12-18 | 2002-07-03 | 无锡市永鑫精密钢带厂 | High-precision ultra-thin very-wide cold-rolled steel band, chrome-plated steel band for shield of optical fibre cable and technology thereof |
| CN104204235A (en) * | 2012-03-30 | 2014-12-10 | 塔塔钢铁艾默伊登有限责任公司 | A process for manufacturing a recovery annealed coated steel substrate for packaging applications and a packaging steel product produced thereby |
| CN104711474A (en) * | 2013-12-12 | 2015-06-17 | 上海梅山钢铁股份有限公司 | Cold rolled tin-plated steel plate for multiple printing and painting and manufacturing method thereof |
| CN107723427A (en) * | 2017-11-22 | 2018-02-23 | 福清市辉华不锈钢制品有限公司 | A kind of production technology of stainless steel belt |
| CN110129796A (en) * | 2018-11-16 | 2019-08-16 | 江西凤凰光学科技有限公司 | A kind of strip Rework Technics |
-
2020
- 2020-11-03 CN CN202011207135.7A patent/CN112376110A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01234596A (en) * | 1988-03-15 | 1989-09-19 | Nippon Steel Corp | Electrolytic treatment of steel sheet plated with chromium |
| CN1193293A (en) * | 1996-03-15 | 1998-09-16 | 川崎制铁株式会社 | Ultra-thin steel sheet and mfg. method therefor |
| CN1356185A (en) * | 2001-12-18 | 2002-07-03 | 无锡市永鑫精密钢带厂 | High-precision ultra-thin very-wide cold-rolled steel band, chrome-plated steel band for shield of optical fibre cable and technology thereof |
| CN104204235A (en) * | 2012-03-30 | 2014-12-10 | 塔塔钢铁艾默伊登有限责任公司 | A process for manufacturing a recovery annealed coated steel substrate for packaging applications and a packaging steel product produced thereby |
| CN104711474A (en) * | 2013-12-12 | 2015-06-17 | 上海梅山钢铁股份有限公司 | Cold rolled tin-plated steel plate for multiple printing and painting and manufacturing method thereof |
| CN107723427A (en) * | 2017-11-22 | 2018-02-23 | 福清市辉华不锈钢制品有限公司 | A kind of production technology of stainless steel belt |
| CN110129796A (en) * | 2018-11-16 | 2019-08-16 | 江西凤凰光学科技有限公司 | A kind of strip Rework Technics |
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Application publication date: 20210219 |