CN101126169A - Thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof - Google Patents
Thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof Download PDFInfo
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- CN101126169A CN101126169A CNA2006100302134A CN200610030213A CN101126169A CN 101126169 A CN101126169 A CN 101126169A CN A2006100302134 A CNA2006100302134 A CN A2006100302134A CN 200610030213 A CN200610030213 A CN 200610030213A CN 101126169 A CN101126169 A CN 101126169A
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Abstract
The invention relates to a surface processing method and the processing liquid of a successive casting roller, more particularly, relates to the electric plating method and the electric plating liquid to the surface of a thin belt successive casting crystallizing roller. The electric plating method mainly aims at solving the technical problems that the thickness of the plated layer obtained with the prior method is not even enough and the overall property of the plated layer is slightly inadequate. The electric plating method in the invention comprises two steps namely preprocessing before plating operation and electric plating operation of a metallic nickel. During the step of preprocessing before plating operation on the surface of the successive casting crystallizing roller, the step includes the following operations: organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activatory process. Within the step of electric plating operation of a metallic nickel, the components of the electric plating liquid consists of nickel sulfamic acid Ni (NH2SO3)2.4H2O 250 to 380gs per l, nickelous chloride NiCl2.6H2O 8 to 15gs per l, boric acid H3BO3 25 to 40gs per l and dodecyl sodium sulfate CH3(CH2)10CH2OSO3Na 0.05 to 0.1gs per l. when in electric plating operation, the electric current density within the original 4 to 12 minutes is 0.5 to 2.0A per dm2, the electric current density in normal electric plating operation is 1.0 to 5.0A per dm2 and the rotating speed of a roller is 2 to 7 cycles per minute. The obtained metallic nickel plated layer has strong intensity with the substrate and further has the advantages of low stress, even thickness, fine flexibility, friction bearable, excellent cold and hot resistant and antifatigue properties.
Description
Technical field:
The present invention relates to a kind of continuous casting roller surface treatment method and treatment solution thereof, particularly a kind of thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof.
Background technology:
Strip continuous casting technology is a cutting edge technology in metallurgy and the investigation of materials field, and it has changed traditional production process of controlling slim steel in the metal working industry.Adopt strip continuous casting technology, will cast continuously, rolling even thermal treatment etc. integrates, the strip base that makes production slightly through cold rolling with regard to disposable formation finished industrial product, simplified production process, shortened the production cycle, its processing line length is 60m only.Its appearance just brings a revolution for Iron And Steel Industry.
The strip continuous casting technology process program is divided into belt, roll-type, roller belt-type etc. because of the difference of crystallizer, and wherein the twin-roll thin strip continuous casting technology has development prospect most.Its technological principle is that molten metal is injected between a pair of reverse rotation and the inner water flowing refrigerative crystallization roller, makes molten metal solidify the formation strip between two rollers.In the continuous casting process, the crystal roller surface temperature of contact molten steel is about 600 ℃, and when the crystallization rolling was made metal sheet band, the crystal roller surface that contacted molten steel originally partly also rotated and leaves liquid metal, be exposed in the air, its surface temperature rapid drawdown is to about 200 ℃.This shows that the residing environment of crystal roller surface is very abominable in the casting process, crystal roller surface will bear chemical corrosion that cold and hot fatigue and stress deformation, high temperature oxidation, molten steel and covering slag cause and the rolling throwing friction and wear to its generation.Thereby continuous casting crystal roller surface should have good cold-and-heat resistent fatigue property, good heat-conducting, higher physical strength and wear resistance and corrosion resistance nature preferably.
In order to improve crystallization roller work-ing life, to improve thin strap continuous casting production efficiency.The same with traditional square billet, continuous casting crystallizer for plate billet, can be at crystal roller surface plating layer of metal nickel coating.This metal plating can be regulated the Heat transfer coefficient of crystallization roller on the one hand; so that the uniform high-efficiency more of the heat exchanging process on the roll surface; can also protect the crystallization roller body on the other hand; thermal stresses that produces when alleviating casting and mechanical stress are avoided the wearing and tearing of rolling throwing to the crystallization roller to the damage of crystallization roller.The improved crystallization roller of surface property, prolong its work-ing life, thereby reduced thin strap continuous casting production cost, the production efficiency that has improved thin strap continuous casting and quality product.
It is technology and the equipment that the continuous casting of thin metal band is used the casting roller surface metal plating layer with electrolytic process that Chinese patent ZL97194984.0 has introduced a kind of.This patent mainly lays particular emphasis on the introduction to equipment, and electroplating technology and method are mentioned seldom.Major technique characteristics of this patent are to adopt the method for cathode screen or galvanic protection; make electric current at roll surface uniform distribution everywhere; especially be difficult for producing current concentration in edges and corners, roller edge, thereby obtain the nickel layer that thickness is even, stress is little, the cold-and-heat resistent fatigue property is good.Yet the method for this cathode screen or galvanic protection is the known solution of field of electroplating, when electroplating the bigger workpiece of area, all can be applied to this method.Obtain uniformly, an important factor of low-stress, the cold and hot fatigue property coating of excellent anti, also be this quality factor, be the electroplating technology of preparation coating, comprise that mainly plating bath forms, the current density size is electroplated for the roller class and also should be comprised the roller speed of rotation.Chinese patent ZL200510020466.9 has introduced a kind of method of coated metal of dual-roller thin-band conticaster roll surface.This patent has been introduced the method that adopts brush plating and has been obtained to contain the composite deposite of nano particle at roll surface, and this coating has hardness height, anti abrasive advantage, owing to can adopt the high electric current to carry out brush plating, so the coating sedimentation rate is fast, and the plating time is short.The brush plating method that this patent is introduced is not quite similar with the coating sedimentation mechanism of electro-plating method, and the structure of gained coating and performance are also inequality.With respect to brush plating method, electro-plating method is to carry out under lower current density, thereby its plating speed is relatively low, exactly because but also under this relatively low current density, can make the crystals dislocation and the defective that deposit reduce, obtain the coating of low internal stress, high ductibility, such coating and crystallization roller basal body binding force are strong, difficultly peel off, crackle, the cold-and-heat resistent excelling in fatigue property.Though with respect to brush plating method, the coating hardness that electro-plating method obtained is relatively low, abrasion resistance properties may weaken to some extent, with regard to the applying working condition of crystallization roller, the requirement of coating and high base strength, cold-and-heat resistent fatigue property is stressed more.
Summary of the invention: the purpose of this invention is to provide a kind of thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof, mainly solve the poor slightly technical problem of over-all properties of the method coating of existing cathode screen or galvanic protection.The present invention has cold-and-heat resistent fatigue property, low-stress, wear-resisting at crystal roller surface plating one deck, the metal plating strong with basal body binding force, prolong the work-ing life of crystallization roller, thereby can reduce the production efficiency and the quality product of thin strap continuous casting production cost, raising thin strap continuous casting.
Technical scheme of the present invention is: a kind of thin belt continuous casting crystal roller surface electroplating method may further comprise the steps:
Pre-treatment before a, the plating:
Continuous casting crystal roller surface is plated preceding pre-treatment, i.e. organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation treatment.
B, plated metal nickel:
Consisting of of electroplate liquid:
Thionamic acid nickel (NH
2SO
3)
2.4H
2O 250-380g/l
Nickelous chloride NiCl
2.6H
2O 8-15g/l
Boric acid H
3BO
325-40g/l
Sodium laurylsulfonate CH
3(CH
2) 10CH
2OSO
3Na 0.05-0.1g/l
Electroplating technical conditions is:
In full immersion of workpiece roller to be plated or the half immersion plating liquid, roll surface is 100mm-400mm apart from the soluble anode distance.
Bath temperature 48-58 ℃
Plating bath pH 2.8-4.5
Initial 4-12 minute current density 0.5-2.0A/dm
2
Current density 1.0-5.0A/dm during normal the plating
2
Roller rotating speed 2-7 commentaries on classics/min
Alr mode and intensity pneumatic blending; 1.0-1.5m
3/ m
2.min
C, plating finish:
After reaching 0.5-2.0mm, finishes coating to electroplate.
The invention has the beneficial effects as follows: 1, the present invention has carried out pre-treatment before a series of platings to crystal roller surface, and has adopted the low current density plating when initial the plating, makes that the bonding force between gained coating and the matrix is very excellent.2, the present invention adopts suitable electroplating technology: electroplate liquid composition, current density, roller speed of rotation, stirring intensity etc. have obtained low-stress, thickness is even, ductility good, the metallic nickel plated layer of cold-and-heat resistent excelling in fatigue property.The crystal roller surface coating, the especially coating of edges and corners, roller edge that adopt the present invention to obtain are difficult for peeling off in casting process, crackle.3, adopt the present invention can obtain the metallic nickel plated layer that thickness is 0.5-2.0mm on continuous casting crystallization roller, this coating can effectively be adjusted the Heat transfer coefficient of crystallization roller on the one hand, so that the uniform high-efficiency more of the heat exchanging process on the roll surface.Can protect the crystallization roller body on the other hand, thermal stresses that produces when alleviating casting and mechanical stress are avoided the wearing and tearing of rolling throwing to the crystallization roller to the damage of crystallization roller.The present invention has prolonged the work-ing life of crystallization roller, thereby can reduce the production efficiency and the quality product of thin strap continuous casting production cost, raising thin strap continuous casting.
Embodiment:
The present invention realizes according to the following step:
1. to 135dm
2The crystallization roller carries out the machining surface processing treatment, removes surface oxide layer and rejected region, and surface irregularity is about 3.2.
2. use the greasy dirt and the scraps bits on acetone cleaning roller surface, use flushing with clean water then.
3. use and electroplate with conventional alkali degreasing solution wiper rolls surface, solution temperature is about 50 ℃, uses flushing with clean water then.
4. the crystallization roller is carried out electrolytic degreasing, the crystallization roller is immersed in the degreasing fluid, and the degreasing fluid temperature is about 70 ℃, and current density is 5.0A/dm
2, the treatment time is 3min, hangs out roller then, uses flushing with clean water.
5. use to electroplate and with conventional acid etching solution the crystallization roller is carried out activation treatment, the etch time is 1min, uses flushing with clean water then.
6. before the plating of crystallization roller, adopt the nickel sulfamic acid solution spray roll surface of weak acid such as 3g/l, it is carried out activation treatment.
7. plated metal nickel: 5 groups of concrete implementation data are provided, form and see Table 1, technology sees Table 2.
Table 1 electroplate liquid is formed proportioning
| Thionamic acid nickel (NH 2SO 3) 2.4H 2O | Nickelous chloride NiCl 2.6H 2O | Boric acid H 3BO 3 | Sodium laurylsulfonate CH 3(CH 2)10CH 2OSO 3Na | |
| The present invention | 250-380g/l | 8-15g/l | 25-40g/l | 0.05-0.1g/l |
| Embodiment 1 | 250 | 15 | 25 | 0.05 |
| Embodiment 2 | 280 | 15 | 25 | 0.05 |
| Embodiment 3 | 310 | 12 | 35 | 0.08 |
| Embodiment 4 | 340 | 12 | 35 | 0.1 |
| Embodiment 5 | 380 | 8 | 40 | 0.1 |
Table 2 electroplating technological parameter
| Bath temperature ℃ | Plating bath pH | Initial current density: A/dm 2 | Normal current density: A/dm 2 | Roller rotating speed commentaries on classics/min | Stirring intensity m 3/m 2.min | |
| The present invention | 48-58 | 2.8-4.5 | 0.5-2.0 | 1.0-5.0 | 2-7 | 1.0-1.5 |
| Embodiment 1 | 58 | 4.5 | 0.5 | 1.0 | 7 | 1.0 |
| Embodiment 2 | 52 | 4.0 | 1.0 | 3.0 | 5 | 1.2 |
| Embodiment 3 | 50 | 3.5 | 1.0 | 3.0 | 5 | 1.2 |
| Embodiment 4 | 48 | 3.0 | 1.5 | 4.0 | 3.5 | 1.4 |
| Embodiment 5 | 48 | 2.8 | 2.0 | 5.0 | 2 | 1.5 |
Electroplating technical conditions is:
In full immersion of workpiece roller to be plated or the half immersion plating liquid, roll surface is 100mm-400mm apart from the soluble anode distance.Initial current density is meant initial current density of electroplating 4-12 minute, current density when normal current density is meant normal platings, and plating is the employing pneumatic blending.After reaching 0.5-2.0mm, finishes coating to electroplate.
Even by the thickness of above process gained coating, thickness and thinnest part thickness difference only are about 0.3mm, and this shows that the electric current distribution of roll surface is even in electroplating process, and it is less that this will make coating waste during machining after plating.The average hardness of coating is 230Hv.The internal stress of coating only is 30-40N/mm
2The matrix that is coated with coating of the present invention is carried out cold and hot fatigue test, insulation is 5 minutes under 600 ℃ of temperature, be in the quenching-in water of room temperature then, under 600 ℃ of temperature, be incubated 5 minutes again, repeat this type of insulation and quenching test 350 times, found that coating and matrix bond are intact, the coating surface flawless, peel off, defective such as bubbling.The crystallization roller that employing is coated with coating of the present invention carries out the twin-roll thin strip Casting steel strip, and is intact through coating behind continuous casting 30 heats.
Claims (7)
1. thin belt continuous casting crystal roller surface electroplating method, comprise preceding pre-treatment of plating and plated metal nickel step, continuous casting crystal roller surface is plated preceding pre-treatment, be organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation treatment, it is characterized in that, in plated metal nickel step, the consisting of of electroplate liquid: thionamic acid nickel (NH
2SO
3)
2.4H
2O 250-380g/l, nickelous chloride NiCl
2.6H
2O 8-15g/l, boric acid H
3BO
325-40g/l, sodium laurylsulfonate CH
3(CH
2) 10CH
2OSO
3Na 0.05-0.1g/l, during plating, initial 4-12 minute current density is 0.5-2.0A/dm
2, current density is 1.0-5.0A/dm when normally electroplating
2, the roller rotating speed is 2-7 commentaries on classics/min.
2. a kind of thin belt continuous casting crystal roller surface electroplating method according to claim 1 is characterized in that, roll surface is 100mm-400mm apart from the soluble anode distance.
3. a kind of thin belt continuous casting crystal roller surface electroplating method according to claim 1 is characterized in that, plating bath temperature is 48-58 ℃.
4. a kind of thin belt continuous casting crystal roller surface electroplating method according to claim 1 is characterized in that, bath pH value is 2.8-4.5.
5. a kind of thin belt continuous casting crystal roller surface electroplating method according to claim 1 is characterized in that, plating bath stirs and adopts pneumatic blending, and stirring intensity is 1.0-1.5m
3/ m
2.min.
6. a kind of thin belt continuous casting crystal roller surface electroplating method according to claim 1 is characterized in that, finishes to electroplate after coating reaches 0.5-2.0mm.
7. a thin belt continuous casting crystal roller surface electroplating liquid is characterized in that, the consisting of of electroplate liquid: thionamic acid nickel (NH
2SO
3)
2.4H
2O 250-380g/l, nickelous chloride NiCl
2.6H
2O 8-15g/l, boric acid H
3BO
325-40g/l, sodium laurylsulfonate CH
3(CH
2) 10CH
2OSO
3Na 0.05-0.1g/l.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610030213A CN100577889C (en) | 2006-08-18 | 2006-08-18 | A kind of thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610030213A CN100577889C (en) | 2006-08-18 | 2006-08-18 | A kind of thin belt continuous casting crystal roller surface electroplating method and electroplate liquid thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101126169A true CN101126169A (en) | 2008-02-20 |
| CN100577889C CN100577889C (en) | 2010-01-06 |
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|---|---|---|---|
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| CN102732916A (en) * | 2011-04-13 | 2012-10-17 | 山东泰宝包装制品有限公司 | Rapid electroforming process |
| CN102330122B (en) * | 2011-10-08 | 2014-01-01 | 上海应用技术学院 | Electroplate liquid for electroplating semi-bright nickel at high speed as well as preparation method and application thereof |
| CN102330122A (en) * | 2011-10-08 | 2012-01-25 | 上海应用技术学院 | Electroplate liquid for electroplating semi-bright nickel at high speed as well as preparation method and application thereof |
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| CN104120461A (en) * | 2013-04-28 | 2014-10-29 | 上海宝钢工业技术服务有限公司 | Method for preparing gradient alloy plating layer on surface of thin strip continuous casting crystallization roller and plating solution |
| CN105478691A (en) * | 2015-12-31 | 2016-04-13 | 张颖 | Preparation method of crystallizer copper plate plated with ferro-nickel alloy layer |
| CN105463533A (en) * | 2016-01-21 | 2016-04-06 | 张颖 | Electroplating liquid for continuous casting roller type crystallizer |
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| CN114657615B (en) * | 2022-03-25 | 2023-11-14 | 重庆理工大学 | Wear-resistant nickel coating with gradient nano structure and preparation method thereof |
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