CN101570841B - Electromagnet assisted plating hot dip plating method - Google Patents
Electromagnet assisted plating hot dip plating method Download PDFInfo
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- CN101570841B CN101570841B CN2008101817620A CN200810181762A CN101570841B CN 101570841 B CN101570841 B CN 101570841B CN 2008101817620 A CN2008101817620 A CN 2008101817620A CN 200810181762 A CN200810181762 A CN 200810181762A CN 101570841 B CN101570841 B CN 101570841B
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Abstract
The invention relates to a pulse electromagnet assisted plating hot dip plating method. The method comprises the steps of applying a pulse electromagnetic field to the coating formation position, and then applying a pulse magnetic field again to the coating before the bath on a plated piece is not completely solidified. The method relies on the pulse dynamic magnetic fields to carry out local electromagnetic stirring of the zinc fused mass near the coating of a hot dip steel plate, thereby thinning the hot galvanizing coating crystal, improving the binding force between the coating and a substrate and the compactness of the coating, and consequently reaching the aim of improving the quality of the coating of the hot dip steel plate. The method has important application value in the field of the hop dip galvanizing or aluminizing of bands or wires, and bright generalization prospect.
Description
The application be that May 30, application number in 2006 are 200610027087.7 the applying date, name is called the dividing an application of application for a patent for invention of " electromagnet assisted plating hot dip plating method and device ".
Technical field
The present invention relates to a kind of hot dip coating method and device, relate in particular to a kind of electromagnet assisted plating hot dip plating method and device.
Background technology
Hot dip process is an a kind of surface of steel plate protection production technology, and smooth, the fine and close and band steel matrix of major requirement coating is in conjunction with closely, to reach attractive in appearance, protect and to improve purpose such as follow-up punching performance.In the actual production some defectives such as the normal plating exfoliation that occurs, efflorescence, cracking, plating deficiency study carefully its essence be during owing to hot dip coating and matrix in conjunction with bad and the compactness extent of coating own is not high causes, directly influence quality product and follow-up punching press deformation performance.To this problem, normally control, but effect is still not very good from aspects such as plating bath alloying constituent, zinc crucible processing parameter, substrate cleaning and air knives.
This respect, U.S. Pat 6761935B2, US5702528 apply electromagnetic field at wire rod or sheet material immersion plating zinc crucible outlet position, rely on electromagnetic force control thickness of coating, China patent CN2332733Y also carries out electromagnetism in similar position to wire surface coating to wire rod and smears system.In addition, still find no patent, the bibliographical information of controlling with electromagnetic technique to coating crystal grain and with the substrate bond quality.The above-mentioned patent that has detected all is to apply electromagnetic field above immersion plating zinc crucible outlet liquid level, and purpose is to rely on electromagnetic force control thickness of coating, and it acts on " air knife " in the similar hot dip process; Different therewith, the present invention is then introducing pulsatory current near in the zinc liquid of steel band, purpose is to rely on pulse electromagnetic field stirring, refinement hot-dip coating precipitated phase, improves bonding force and the compactness extent of coating own between coating and the substrate, and its effect is similar to " induction stirring " in the continuous casting.This patent is mainly by introducing pulsed current in coating zinc liquid, its electromagnetic force form, apply the position and the effect purpose is all completely different with known patent.
Summary of the invention
The objective of the invention is for eliminating the hot dip process mass defect that above-mentioned prior art exists, a kind of new technical scheme at hot dip process process introducing pulse electromagnetic field is proposed, rely on the pulse dynamic electromagnetic field, near the hot-dip steel plate coating zinc melt is carried out the local induction stirring, refinement hot galvanized layer crystal, improve the bonding force and the coating density of coating and substrate, thereby reach the purpose of improving hot dip process steel plate coating quality.
It on the hot dip process nature process that a plating bath metal and substrate metal react and spread and coagulate bonding course.When the zinc in the plating bath (aluminium) when contacting with iron, generate multiple different, the complicated intermediate phase of different in kind, equate as ζ phase, δ phase, Γ phase, η.On coating inside and coating and substrate interface, there is coarse grain, must reduces coating and substrate junction and make a concerted effort and the density of coating own.Form the position at coating during hot dip process and apply pulse electromagnetic field, its purpose relies on electromagnetic field effect refinement coating primary phase crystal grain exactly, improves coating and substrate junction and makes a concerted effort and refinement coating density, thereby improve the hot-dip coating quality.Pulse electromagnetic helps the electromagnetic force effect of the main apply pulse electric current of plating, its effect comprises three aspects: (1) is when having electric current to flow through in the electrofluid, can occur that conductive fluid is subjected to magnetic pressure and to the central axis shrinkage phenomenon, it is magnetic pinch effect, pulsed current causes pulsating pressure, electromagnetic pressure formed cold, solidified condensate depression thereby increased, refinement coating crystal grain; (2) pulsating pressure exerts an influence to atomic diffusion, and pulsating pressure influences diffusion activation energy, and then to metal freezing nucleation rate influence, square exponentially of nucleation rate and current density increases relation, and relation object is seemingly therewith in the influence of pulsed voltage; (3) there is gradient in the melt electromagnetic contractile force, it is poor to form local velocity between each bolus flow, thereby cause shear-stress, when shear-stress is enough big, dentrite in the melt by cataclasm be fine grained chippings, be free in the liquid melts, thereby can form new grain growing center, the crystal grain after finally causing solidifying obtains refinement and isometry.These effects all help and the acquisition of substrate in conjunction with the high quality hot-dip coating tight, that coating itself is fine and close.
The object of the present invention is achieved like this:
A kind of electromagnet assisted plating hot dip plating method is characterized in that: form the position at coating and apply pulse electromagnetic field, again it is not applied a pulsed magnetic field before not solidifying fully behind the plating piece plating bath, to prolong the action time of pulse electromagnetic field.
A kind of electromagnet assisted plating hot dip plating device comprises the zinc crucible, plating bath, and the sinking roller is characterized in that, also comprises: a pulse power; Pulsed electrode is arranged in the immersion plating liquid, is connected with the pulse power.It is isolated partly to be provided with the electrical isolation cover at inoperative between electrode and the plating bath, between the adjacent different in nature electrode.Electrode materials aluminium, steel, electrically conductive cermet or band coating metal.
Described electrode divides bull, for the homonymy same sex is provided with or be the setting of the homonymy opposite sex.Every counter electrode is provided with the resistance voltate regulator in the loop, with improve between the electrode along the homogeneity of the voltage that applied on strip width and the short transverse.One solenoid that is connected with the described pulse power is set above described pulsed electrode, and described pulsed electrode and solenoid are connected in parallel on the power supply.The copper pipe coiling of described solenoid, there is water cooling inside, and copper pipe surface is coated with the electric insulation layer protection, and the number of turn is 1～10 circle.
Described power 50～500kW, pulse-repetition 0.1～100kHz.According to plating piece size and travelling speed, thickness of coating difference, power should be different with frequency.And preferably can realize that to output power of power supply closed loop controls automatically by the strip speed transmitter.
Electromagnet assisted plating hot dip plating method of the present invention and device thereof owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and positively effect:
1, the present invention helps to obtain in conjunction with tight, fine and close hot-dip coating own in the structural improvement of the method and apparatus of electromagnet assisted plating hot dip plating;
2, the present invention is in the structural improvement of the method and apparatus of electromagnet assisted plating hot dip plating, makes fast, pulse electromagnetic field a little is present in the local scope, can not cause the disturbance on a large scale of molten bath slag stream, and quality of coating is worsened;
3, the present invention makes pulse electromagnetic field change fast, a little in the structural improvement of the method and apparatus of electromagnet assisted plating hot dip plating, and average power drawn is low, has saved the energy;
4, the present invention is in the structural improvement of the method and apparatus of electromagnet assisted plating hot dip plating, not only zinc liquid temperature required lowly, and the electrode materials problem solves easily.
Description of drawings
By following to electromagnet assisted plating hot dip plating method of the present invention and device thereof embodiment and in conjunction with the description of its accompanying drawing, can further understand purpose of the present invention, specific structural features and advantage.Wherein, accompanying drawing is:
Fig. 1 is an electromagnet assisted plating hot dip plating principle schematic of the present invention;
Fig. 2 is an electromagnet assisted plating hot dip plating device schematic perspective view of the present invention;
Fig. 3 is electric field and a current diagram between the electrode;
Many counter electrode synoptic diagram that Fig. 4 arranges for the homonymy same sex;
Fig. 5 is that the A of Fig. 4 is to view;
Fig. 6 is that the B of Fig. 4 is to view;
Fig. 7 is many counter electrode synoptic diagram that the homonymy opposite sex is arranged;
Fig. 8 is that the C of Fig. 7 is to view;
Fig. 9 is that the D of Fig. 7 is to view;
Figure 10 is the cross connection and the control mode synoptic diagram of many counter electrode and power supply.
Embodiment
As Fig. 1, mainly comprise: electrode 3, solenoid 5, the pulse power 6, velocity sensor 11, lead 7, sinking roller 9, zinc crucible 10 etc. as the device of such scheme.Electrode 3 inserts plating pond 8, pulse-repetition 0.1～100kHz during work.In hot galvanizing process, after 9 commutations of sinking roller, the zinc crucible 10 that makes progress out is provided with pulsed electrode 3 in the molten bath to band steel 1 below liquid level 2 positions from zinc liquid molten bath 8, totally 16 of top electrodes, and grouping places the both sides of band steel 1, spread of electrodes band steel 0.05m in pairs.Electrode 3 is connected with power supply 6 by lead 7.Power 250kW, pulse-repetition 20～25kHz.For preventing short circuit current between the adjacent different in nature electrode, partly isolated with the electrical isolation cover 4 of pottery at the inoperative between electrode 3 and the zinc liquid 8, between the adjacent different in nature electrode, pulsed current will be limited in flowing near the steel band position like this.
The pulse power 6 produces instantaneous low voltage electric field (as Fig. 3) through electrode 3, lead 7 near plating bath, because metal plating resistivity (zinc liquid resistivity 35 * 10
-8Ω m) extremely low, the powerful pulsed current of kiloampere in the inner instantaneous meeting generation of plating bath, the simultaneous excitation strong pulsed magnetic field, the two acting in conjunction makes coating obtain densification, close mode.
As Fig. 2, for prolonging pulse electromagnetic field action time, above plating pond liquid level 2, a solenoid 5 is set again, coil turn 1～10 circle, band steel 1 leaves 8 backs, plating pond and is upward through from coil 5 inside, behind the make pulse power supply 6, at the coil 5 inner pulsed magnetic fields that produce, the melt secondary action again that pulsed magnetic field does not solidify as yet fully to steel band 1 surface that just goes out zinc crucible 10 further improves quality of coating.
For raising helps the plating quality, arrange many counter electrode in band steel both sides.The layout that many counter electrode are in band steel both sides is divided two kinds of homonymy homopolarity mode (as Fig. 4, Fig. 5, Fig. 6) and homonymy heteropole modes (seeing Fig. 7, Fig. 8, Fig. 9).The pulsed current that produces between the homonymy heteropole mode electrode is except having the trend of passing band steel transverse flow, also have along the vertical flow tendency of belt steel surface mobile, can produce complicated more induction stirring refining effect to the coating alloy, this is stable at the band steel, big heteropole plating pond, sinking roller superjacent air space position slag produces under few situation and becomes preferential selection mode.
As Figure 10, for improve between the electrode along the homogeneity of the voltage that applies on strip width and the short transverse, perhaps solve along strip width direction quality of coating and the uneven problem of thickness distribution, every counter electrode is provided with the resistance voltate regulator in the loop, with the electrode voltage of different positions on accommodation zone steel length and the cross direction, make different positions additional electrodes voltage uniform distribution or require suitable with quality of coating control.Many counter electrode are divided into 16 electrode branch roads.Be distributed in each counter electrode loop of different positions the adjusting resistance R is set respectively
a, change R according to reality during production
aResistance value is adjusted the voltage that different electrode pair applies, to improve the homogeneity of quality of coating.Promptly establish, the voltage between the power output end 61 and 62 is U, wherein regulates resistance R in i road (i=1～16)
Ai, wherein inherent equivalent resistance such as lead and zinc liquid and band steel is R
0i, the watt current I of I current circuit then
iCan be expressed as:
I
i＝U/(R
ai+R
0i)
The electrode loop inherent equivalent resistance difference of different positions, and often inhomogeneous along strip width direction quality of coating, therefore, by regulating divider resistance R
aCan control more easily and help the plating quality.
Electrode materials prevents the corrosion of electrode under the coating bath temperature with aluminium, steel, electrically conductive cermet or band coating metal etc., plating bath is not produced simultaneously and pollutes.Lead is manufactured with fine copper.The plain conductor, electrode that is positioned at the molten bath contacting of isolated and plating bath at liquid level with lower section useful ceramics cover, prevents short circuit current and to the metallic pollution of plating bath.
Simultaneously, above zinc pond liquid level 2, around the band steel 1 solenoid 5 is set, coil turn 3 circles, solenoid copper pipe coiling, inner water flowing cooling during work, copper pipe surface is coated with the electric insulation layer protection.As shown in Figure 1, solenoid 5 and electrode 3 are connected in parallel in the output terminal of power supply 6 by lead 7.
Normal when zinc-plated, power supply is pressed rated power operation.Power is answered corresponding decline so that close when strip speed reduces for some reason even stops, and it is overheated that the electromagnetism heating causes plating pond local temperature when preventing high-power operation, damages strip quality.
Travelling speed variation (this velocity variations scope sometimes also very greatly) for adaptive zone steel 1, the spy is provided with velocity sensor 11 again, measures strip speed (this signal is desirable from sinking roller 9) by transmitter 11, realizes output power of power supply is carried out closed-loop control, see Fig. 1, with the stable plating quality that helps.
When the online installation of device, the band steel passes in solenoid 5 when wearing band, inserts electrode downwards before the commencement of commercial operation of band steel, and then starts power supply, and steel travelling speed going along with improves to be heightened power to the works better value gradually.This patent method of design novelty, simple in structure, easy to operate provides a kind of effective high hot-dip coating quality control method, has significant application value in band steel/wire rod pot galvanize (aluminium) field, and promotion prospect is wide.
Claims (4)
1. an electromagnet assisted plating hot dip plating method is characterized in that: form the position at coating and apply pulse electromagnetic field.
2. electromagnet assisted plating hot dip plating method as claimed in claim 1 is characterized in that: again it is not applied a pulse electromagnetic field before not solidifying fully behind the plating piece plating bath.
3. electromagnet assisted plating hot dip plating method as claimed in claim 1 or 2 is characterized in that: the pulse-repetition of described pulse electromagnetic field is 0.1～100kHz.
4. pulse electromagnetic assistant dip coating method according to claim 1 and 2 is characterized in that: the power of described pulse electromagnetic field is 50～500kW, and its output is according to the control automatically of strip speed size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101817620A CN101570841B (en) | 2006-05-30 | 2006-05-30 | Electromagnet assisted plating hot dip plating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101817620A CN101570841B (en) | 2006-05-30 | 2006-05-30 | Electromagnet assisted plating hot dip plating method |
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|---|---|---|---|
| CNB2006100270877A Division CN100519818C (en) | 2006-05-30 | 2006-05-30 | Electromagnetic assistant dip coating method and device |
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|---|---|
| CN101570841A CN101570841A (en) | 2009-11-04 |
| CN101570841B true CN101570841B (en) | 2011-07-20 |
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| CN102330043B (en) * | 2011-08-03 | 2013-03-13 | 马鞍山鼎泰稀土新材料股份有限公司 | Steel wire hot dipping rare earth zinc alloy and hot dipping method |
| ITMI20121533A1 (en) * | 2012-09-14 | 2014-03-15 | Danieli Off Mecc | ELECTROMAGNETIC STABILIZER |
| CN112267086A (en) * | 2020-09-30 | 2021-01-26 | 成都航空职业技术学院 | Method for preparing titanium-aluminum alloy high-strength coating on surface of titanium alloy under assistance of electromagnetic field |
| CN112095063A (en) * | 2020-09-30 | 2020-12-18 | 成都航空职业技术学院 | Titanium alloy surface coating and preparation method thereof |
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