CN103421994B - Scale-like multi-element aluminum zinc silicon alloy powder containing La and Pr, and preparation method thereof - Google Patents
Scale-like multi-element aluminum zinc silicon alloy powder containing La and Pr, and preparation method thereof Download PDFInfo
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- CN103421994B CN103421994B CN201310331275.9A CN201310331275A CN103421994B CN 103421994 B CN103421994 B CN 103421994B CN 201310331275 A CN201310331275 A CN 201310331275A CN 103421994 B CN103421994 B CN 103421994B
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Abstract
The invention relates to a scale-like multi-element zinc aluminum alloy powder containing La and Pr, and a preparation method thereof. In the scale-like multi-element zinc aluminum alloy powder, the sheet thickness is 0.1 to 1 micron, the average sheet diameter is 5 to 35 microns, and specifically, the powder comprises the following particles in size: less than or equal to 20% of the powder with the sheet diameter being less than 5 microns, more than or equal to 70% of the powder with the sheet diameter being 5 to 33 microns and less than or equal to 10% of the powder with the sheet diameter being more than 33 microns; the diameter thickness ratio of the average sheet diameter to the sheet thickness of the scale-like multi-element zinc aluminum alloy powder is 35 to 200. The scale-like metal powder and the preparation method thereof provided by the invention are particularly suitable for the fields of production of Dacromet coating liquid, inorganic zinc-enriched paint, heavy anti-corrosion paint and the like.
Description
Technical field
The present invention relates to a kind of Scale-like multi-component zinc aluminum silicon alloy powder and preparation method thereof.
Background technology
Dacromet Technology is born in later 1950s the earliest, it is a kind of metallic coating treatment technology of similar electro-galvanizing, the high dispersive water soluble paint that the scientist Mai Ke Martin of the U.S. to have developed with metal zinc metal sheet as mainly adding aluminium flake simultaneously, chromic acid, deionized water make solvent, coating sticks on metallic matrix, through full closed cycle coating baking, form very thin coating.Dacromet/steel successfully resists the erosion of chlorion, and aseptic technic enters new step, has reformed the defect that traditional technology anti-corrosion life is short.Dacromet/steel outward appearance is uniform silver gray, and containing the thin zinc metal sheet of 80% and aluminium flake in coating, all the other are chromic salt, have excellent performance, as extremely strong erosion resistance etc.; Be specially adapted to high strength stressed member, as the high strength bolt for subway engineering; High heat resistance; Heat resisting temperature can reach 300 DEG C.In addition, also there is the advantages such as hypertonicity, high tack, high antifriction quality, high weather resistance, high resistance to chemicals product stability and non-environmental-pollution.In the various fields such as automobile, civil construction, electric power, chemical industry, oceanographic engineering, household electrical appliance, railway, highway, bridge, tunnel, war industry of industrially developed country, obtain applying very widely.Current Dacroment masking liquid is of a great variety, but general still existing defects needs perfect further, and such as need realization to dechromise and need to improve its performance etc. further, the performance of the flakey alloy powder of especially comparatively common employing still cannot meet processing requirement completely.
In addition, the manufacture method of current domestic existing flaky metal powder mainly contains mechanical process, Physical and chemical method etc.Wherein mechanical process mainly contains ball milled and ultrasonication method, and wherein ball milled comparatively generally adopts in actual production.Ball milled is divided into again dry grinding and wet-milling two kinds of complete processings, and wherein wet milling process is mainly included in the process of metal powder grinding the operation adding such as solvent wet goods medium and carry out grinding, then passes through sorting, filter, dry, screening, redrying, the operations such as packaging are achieved.Above-mentioned wet milling process drying process is complicated, and the cycle is long, and efficiency is low, and metal powder is oxidizable, and more seriously metal powder after drying can remain a part of medium, affects use range and the quality of metal powder.And dry mill process needs long dispersed with stirring, increase energy consumption, and Superfine Zn powder, aluminium powder that dry mill process manufacture obtains, the powder that its shape and performance all need with Dacroment technique has again larger gap, thus limits the process of Non-chromium Zn-al Coating technology industrialization.
Therefore, flakey alloy powder of a kind of improvement and preparation method thereof is provided just to become the technical barrier of this field urgent need solution.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of high-quality flakey Multielement zinc-aluminum alloy powder that can meet extraordinary coating process requirement, and provide that a kind of efficiency is high, cost is low and be applicable to the preparation method of actual production.
Flakey Multielement zinc-aluminum alloy powder provided by the present invention, its components based on weight percentage is: Al:15%-69%; Si:0.2-3%; Mg:0.1-5%; The total amount of at least two kinds of rare earth elements: 0.02-0.9%, and wherein said at least two kinds of rare earth elements mainly comprise La and Pr; Total amount is no more than the impurity of 1%; Surplus is Zn, the sheet of wherein said flakey Multielement zinc-aluminum alloy powder is thick is 0.1 ~ 1 μm, average sheet footpath is 5 ~ 35 μm, and wherein specifically the consisting of of granularity: sheet footpath be less than 5 μm account for≤20%, 5 ~ 33 μm, sheet footpath accounts for >=and 70%, sheet footpath is greater than 33 μm≤10%, and the average sheet footpath of described flakey Multielement zinc-aluminum alloy powder and the thick radius-thickness ratio of sheet are 35 ~ 200.
Preferably, the average sheet footpath of wherein said flakey Multielement zinc-aluminum alloy powder and the thick radius-thickness ratio of sheet are 50 ~ 150.
Preferably, the loose density of wherein said flakey Multielement zinc-aluminum alloy powder is 1.0 ~ 3.0gcm
-3.
Preferably, the coating surface on water of wherein said flakey Multielement zinc-aluminum alloy powder is 0.4 ~ 2.0m
2g
-1.
Preferably, wherein La and Pr content and account for per-cent >=85% of rare earth element total amount.
On the other hand, the present invention also provide a kind of manufacture method of flakey Multielement zinc-aluminum alloy powder, get the raw materials ready according to the weight percent of each component of described flakey Multielement zinc-aluminum alloy powder, by each component by proportioning obtained aluminium zinc in smelting furnace, aluminium zinc rod is poured into again by deep-well forging type, then, aluminium zinc rod is put into vacuum atomizing powder manufacturing apparatus and be atomized into the spherical zinc aluminium alloy powder of 200 ~ 500 object, again described spherical zinc aluminium alloy powder is joined in ball mill, add grinding aid and ball-milling medium carries out ball milling simultaneously, and pass into rare gas element again after first vacuumizing, cooling liqs is passed into control in mechanical milling process temperature for 20-60 DEG C in ball mill interlayer, Ball-milling Time is 8 ~ 20 hours, drum's speed of rotation is kept to be 30 ~ 100 revs/min, thus the described spherical Multielement zinc-aluminum alloy sphere of powder is worn into sheet alloy powder, prepare described flakey Multielement zinc-aluminum alloy powder.
Preferably, wherein grinding aid is one or more mixing in Zinic stearas, calcium stearate, moly-sulfide, polyvinyl alcohol, Sodium dodecylbenzene sulfonate, glyceryl alcohol.
Preferably, wherein grinding aid according to described spherical polynary zinc-aluminium powder weight 1% ~ 10% ratio add.
Preferably, wherein ball-milling medium is Ceramic Balls or steel ball, and its particle diameter is 1-15 millimeter.
Preferably, wherein ball-milling medium and described spherical polynary zinc-aluminium powder are (6 ~ 20) by weight: 1.
5 ~ 35 μm, the average sheet footpath of flakey Multielement zinc-aluminum alloy powder of the present invention, and wherein specifically the consisting of of granularity: sheet footpath be less than 5 μm account for≤20%, 5 ~ 33 μm, sheet footpath accounts for >=70%, and sheet footpath is greater than 33 μm≤10%.The concrete composition of this granularity of the present invention not only ensure that the requirement in average sheet footpath, and powder geometrical dimension is evenly distributed, and uniform size-grade distribution is conducive to reducing the defects such as the hole in coating, form the structure of uniform " layer upon layer of ", thus be conducive to the infiltration suppressing corrosive medium, thus improve the antiseptic property of coating.
The sheet of flakey Multielement zinc-aluminum alloy powder of the present invention is thick is 0.1 ~ 1 μm, average sheet footpath is 5 ~ 35 μm, average sheet footpath and the thick radius-thickness ratio of sheet are 35 ~ 200, and improve the radius-thickness ratio of flakey Multielement zinc-aluminum alloy powder greatly, this is of great immediate significance.Because the raising of radius-thickness ratio, when can reduce on the one hand paint, the usage quantity of per unit area zinc aluminium alloy powder, makes production cost greatly reduce; On the other hand, the raising of radius-thickness ratio, can make the sheet zinc aluminium alloy powder being coated in workpiece surface more closely knit, the space caused because sheet alloy powder is blocked up or sheet footpath is in uneven thickness when reducing coating, improves the antiseptic property after paint.Therefore, flakey Multielement zinc-aluminum alloy powder of the present invention obtains important breakthrough relative to prior art.
Further, the loose density of flakey Multielement zinc-aluminum alloy powder of the present invention is 1.0 ~ 3.0gcm
-3, this is also that contriver has paid performing creative labour and just finally obtains.Because the factor that can affect apparent density of powder is a lot, as powder particle shape, size and size-grade distribution etc.And these factors can have again bright sunlight difference because of the difference of the preparation method of powder and processing condition thereof.And the Multielement zinc-aluminum alloy of flakey described in the present invention powder is to meet particle size less, under the precondition that flaking degree is higher, less loose density is furthermore achieved that by the improvement in production technique, thus improve the dispersiveness of flakey Multielement zinc-aluminum alloy powder in coating, also more meet the service requirements of Dyclo paint further.
Further, the present invention makes the coating surface on water of described flakey Multielement zinc-aluminum alloy powder be 0.4 ~ 2.0m by the improvement in production technique
2g
-1, illustrate that flakey Multielement zinc-aluminum alloy powder flaking degree of the present invention is higher, spreadability is better, good dispersity in water.The coating surface on water of the flakey Multielement zinc-aluminum alloy powder in the present invention has exceeded the coating surface on water of domestic simple zinc powder, even can reach the standard of external simple zinc powder product, achieve very outstanding technique effect.
On the other hand, the preparation method of scaled metal powder provided by the present invention compared with prior art instead of in wet-milling by the defect of liquid as grinding medium, by adding grinding aid and ball-milling medium grinds, metal powder after drying can not remain any medium, ensure that use range and the quality of metal powder.
Further, the grinding aid wherein added and ball-milling medium, also assures that and can not produce cold welding phenomenon between metal powder.
Further, in airtight ball mill, pass into rare gas element, oxygen can be avoided to enter, prevent metal powder to be oxidized.
Further, by regulating the method for the cooling water inflow in ball mill interlayer to control the temperature of metal powder between 20 ~ 60 DEG C in mechanical milling process, regulating the rotating speed of ball mill to carry out ball milling at 30-100 rev/min simultaneously, the ball-type metal sphere of powder can be worn into flake metal powder.
In addition, by controlling different rotational speed of ball-mill, quality and the use range of metal powder can also be improved, making prepared metal powder not only can be used for Dyclo paint, also can be used for other protective systems such as zinc rich paint.
Further, the sandwich structure of ball mill by setting up in the present invention, makes cooling liqs such as water be passed into by ball mill interlayer, instead of directly contacts with powder.Compare with traditional wet-milling and long dry grind process, and adopt water-cool control ball milling temperature, not only still avoid the defect of wet-milling, also overcome and need long-time dry deficiency, greatly improve production efficiency.
In addition, flakey Multielement zinc-aluminum alloy powder provided by the present invention adopts dry type ball milling method to obtain, and the medium that when completely avoid wet grinding, powder surface is coated is if solvent oil is on the impact of post-coatings performance.
Finally, zinc aluminium alloy powder provided by the invention is due to the passivation of aluminium, greatly slow down the wear rate of zinc, produced single do not have for the zinc of alloying, the powder of aluminium or its mixed powder, to greatly improve antiseptic property and the anti-corrosion life of coating relative to domestic and international.
In sum, flaky metal powder provided by the invention and preparation method thereof, is particularly suitable for producing Dacroment masking liquid, inorganic zinc rich paint, the fields such as heavy duty system.Moreover, of the present invention provided preparation method is adopted to go for the production of other flake metal powders equally, such as: aluminium powder, copper powder, cu-zn alloy powder, silver powder etc.
Accompanying drawing explanation
Fig. 1 horizontal ball mill sandwich structure figure
Embodiment
Scale-like multi-component zinc aluminum silicon alloy powder of the present invention is elementary composition by Al, Si, Mg, Zn and rare earth etc., some preferred specific embodiments of each composition by weight percent in the present invention are listed in table 1, but the content of each moiety of the present invention is not limited to concrete numerical value listed in table 1, to those skilled in the art, reasonable generalization and derivation can be carried out in the basis of concrete numerical value listed by table 1 completely.
It should be noted that, the present invention is on the basis providing a kind of high-quality flakey Multielement zinc-aluminum alloy powder that can meet extraordinary coating process requirement, by the further improvement in production technique, the performance of described flakey aluminium zinc silicon alloy powder is made to be more than flakey powdered alloy of the prior art all far away, illustrate that the interior microscopic of flakey aluminium zinc silicon alloy powder of the present invention is organized and also there occurs very large change, although these micro-variations cannot be described with further restrictions such as the structure and/or compositions of flakey aluminium zinc silicon alloy powder, but by further describing of performance perameter in table 1, those skilled in the art clearly can know its restriction effect played to flakey aluminium zinc silicon alloy powder of the present invention.
But the performance perameters such as loose density involved in table 1 and coating surface on water are not but solve the requisite technical characteristic of the present invention, and it is only the more excellent technical scheme that the present invention obtains further relative to prior art.For the present invention, the content of core is the setting of flakey Multielement zinc-aluminum alloy powder constitution, especially thick, the sheet footpath of sheets of powder, the concrete composition of granularity and the setting of radius-thickness ratio and reach the goal of the invention being suitable for producing the masking liquids such as Dacroment.And on this basis, be all make this technique effect more outstanding by the further improvement of production technique, more superior.Therefore, record loose density and these two performance perameters of coating surface on water in following table 1 in the description simultaneously, also just in order to technical scheme of the present invention can be introduced more in detail, easily, and not described as the essential features solving the technology of the present invention problem.
Similar therewith, table 1 provides the composition of the rare earth element that the present invention specifically adopts further and concrete content is described as preferred embodiment, those skilled in the art should determine not to be only adopt the rare earth element that provides in table 1 and content thereof can solve its technical problem, those skilled in the art must determine, as long as meet the total amount of rare earth element in the scope of 0.02-0.9%, provide on the basis of two kinds of rare earth elements and content thereof in Table 1, appropriate other rare earth elements that add can solve its technical problem equally.Therefore, two kinds of rare earth elements in table 1 are not described as prerequisite equally.
The each composition of table 1 (weight percent) and performance perameter thereof
Below in conjunction with accompanying drawing 1, illustrate the present invention and prepare flakey Multielement zinc-aluminum alloy powder embodiment, first, get the raw materials ready on request, and by each component by proportioning obtained aluminium zinc in smelting furnace, then pour into aluminium zinc rod by deep-well forging type.Then, aluminium zinc rod is put into vacuum atomizing powder manufacturing apparatus and be atomized into 200 ~ 500 object spherical powders, again spherical zinc aluminium alloy powder is joined in ball mill, add grinding aid simultaneously, ball-milling medium carries out ball milling, rare gas element is passed into again after first vacuumizing, cooling liqs is passed into control ball milling temperature for 20-60 DEG C in ball mill interlayer 1, Ball-milling Time is 8 ~ 20 hours, drum's speed of rotation is kept to be 30 ~ 100 revs/min, the spherical Multielement zinc-aluminum alloy sphere of powder is worn into sheet alloy powder, prepares flakey Multielement zinc-aluminum alloy powder.
The present invention adopt ball mill be the horizontal ball mill of prior art basis on set up a ball mill interlayer 1, thus cooling liqs can be passed into control ball milling temperature in interlayer 1, thus achieve the goal of the invention that cooling liqs and powder separation do not contact to overcome wet-milling defect.
Preferably, ball-milling additive comprises Zinic stearas, calcium stearate, moly-sulfide, polyvinyl alcohol, Sodium dodecylbenzene sulfonate, glyceryl alcohol etc.Stearate, moly-sulfide consumption are the 1-10% of metal-powder weight.
Preferably, adopt ball-milling medium diameter to be 1-15mm, preferably ceramic ball or steel ball etc., the ratio of itself and raw material aluminium zinc silicon alloy powder is 6: 1 to 20: 1.
Preferably, ball mill running speed is not less than 30r/min, and preferred range of choice is 30-100r/min.
Embodiment 1:
Get 300 order aluminium zinc silicon alloy powder raw material 10Kg, Zinic stearas 0.4Kg, steel ball 200Kg drop in ball mill, pass into nitrogen, and connect water coolant after vacuumizing, and ensure that in mechanical milling process, temperature is between 30-40 DEG C.With discharging after the rotating speed ball milling 10h of 50r/min, the powder after ball milling is dropped in polishing machine and carries out polishing, the classified rear obtained flaky aluminum zinc silicon alloy powder of the powder after polishing.
Embodiment 2:
Get 200 order aluminium zinc silicon alloy powder raw material 10Kg, polyvinyl alcohol 0.1Kg, calcium stearate 0.2Kg, steel ball 120Kg drops in ball mill, passes into nitrogen, and connect water coolant after vacuumizing, ensure that in mechanical milling process, temperature is between 30-40 DEG C, with the rotating speed ball milling 14h discharging of 100r/min, the powder after ball milling is dropped in polishing machine and carries out polishing, the classified rear obtained flaky aluminum zinc silicon alloy powder of the powder after polishing.
Claims (10)
1. a flakey Multielement zinc-aluminum alloy powder, its components based on weight percentage is: Al:15%-69%; Si:0.2-3%; Mg:0.1-5%; The total amount of at least two kinds of rare earth elements: 0.02-0.9%, and wherein said at least two kinds of rare earth elements mainly comprise La and Pr; Total amount is no more than the impurity of 1%; Surplus is Zn, the sheet of wherein said flakey Multielement zinc-aluminum alloy powder is thick is 0.1 ~ 1 μm, average sheet footpath is 5 ~ 35 μm, and wherein specifically the consisting of of granularity: 0 < sheet footpath is less than 5 μm≤20%, 5 ~ 33 μm, 70%≤sheet footpath < 100%, 0 < sheet footpath is greater than 33 μm≤10%, and the average sheet footpath of described flakey Multielement zinc-aluminum alloy powder and the thick radius-thickness ratio of sheet are 35 ~ 200.
2. flakey Multielement zinc-aluminum alloy powder as claimed in claim 1, the average sheet footpath of wherein said flakey Multielement zinc-aluminum alloy powder and the thick radius-thickness ratio of sheet are 50 ~ 150.
3. flakey Multielement zinc-aluminum alloy powder as claimed in claim 1, the loose density of wherein said flakey Multielement zinc-aluminum alloy powder is 1.0 ~ 3.0gcm
-3.
4. flakey Multielement zinc-aluminum alloy powder as claimed in claim 1, the coating surface on water of wherein said flakey Multielement zinc-aluminum alloy powder is 0.4 ~ 2.0m
2g
-1.
5. flakey Multielement zinc-aluminum alloy powder as claimed in claim 1, wherein La and Pr content and account for per-cent >=85% of rare earth element total amount.
6. prepare the method for flakey Multielement zinc-aluminum alloy powder described in claim 1 for one kind, get the raw materials ready according to the weight percent of each component of flakey Multielement zinc-aluminum alloy powder described in claim 1, by each component by proportioning obtained aluminium zinc in smelting furnace, aluminium zinc rod is poured into again by deep-well forging type, then, aluminium zinc rod is put into vacuum atomizing powder manufacturing apparatus and be atomized into the spherical zinc aluminium alloy powder of 200 ~ 500 object, again described spherical zinc aluminium alloy powder is joined in ball mill, add grinding aid and ball-milling medium carries out ball milling simultaneously, and pass into rare gas element again after first vacuumizing, cooling liqs is passed into control in mechanical milling process temperature for 20-60 DEG C in ball mill interlayer, Ball-milling Time is 8 ~ 20 hours, drum's speed of rotation is kept to be 30 ~ 100 revs/min, thus the described spherical Multielement zinc-aluminum alloy sphere of powder is worn into sheet alloy powder, prepare described flakey Multielement zinc-aluminum alloy powder.
7. method as claimed in claim 6, wherein grinding aid is one or more mixing in Zinic stearas, calcium stearate, moly-sulfide, polyvinyl alcohol, Sodium dodecylbenzene sulfonate, glyceryl alcohol.
8. method as claimed in claim 6, wherein grinding aid according to described spherical polynary zinc-aluminium powder weight 1% ~ 10% ratio add.
9. method as claimed in claim 6, wherein ball-milling medium is Ceramic Balls or steel ball, and its particle diameter is 1-15 millimeter.
10. method as claimed in claim 6, wherein ball-milling medium and described spherical polynary zinc-aluminium powder are (6 ~ 20) by weight: 1.
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| CN1186153C (en) * | 2003-05-28 | 2005-01-26 | 肖骁 | Flake zinc and zinc-aluminium alloy powder wet method producing process |
| CN101396740B (en) * | 2008-12-11 | 2011-08-10 | 北京航材百慕新材料技术工程股份公司 | Preparation method of scale type aluminum zinc powder using high-energy ball milling |
| CN102086313B (en) * | 2010-11-04 | 2012-08-29 | 江苏麟龙新材料股份有限公司 | Magnesium-containing coating for marine climate-resistant anticorrosion treatment |
| CN102703778B (en) * | 2012-01-13 | 2013-10-23 | 江苏麟龙新材料股份有限公司 | La-Pr-containing zinc-aluminum alloy wire and manufacturing method thereof |
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