CN105132731A - Covering agent for aluminum and aluminum alloy smelting and preparing method of covering agent - Google Patents
Covering agent for aluminum and aluminum alloy smelting and preparing method of covering agent Download PDFInfo
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- CN105132731A CN105132731A CN201510642032.6A CN201510642032A CN105132731A CN 105132731 A CN105132731 A CN 105132731A CN 201510642032 A CN201510642032 A CN 201510642032A CN 105132731 A CN105132731 A CN 105132731A
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Abstract
The invention relates to a covering agent for aluminum and aluminum alloy smelting. The covering agent is prepared from, by mass, 30%-65% of KCl and MgCl2, 15%-55% of NaCl, 2%-20% of CaF2, 5%-20% of hexafluoropropylene aluminate and 2%-10% of hexafluoropropylene fluosilicate. According to the covering agent for aluminum and aluminum alloy smelting, the covering effect of the covering agent on an aluminum melt is good, oxidization of the aluminum melt is effectively avoided, and gas is effectively prevented from being absorbed by the aluminum melt; protective gas is generated when the covering agent makes contact with the high-temperature aluminum melt, the aluminum and aluminum alloy melt is effectively isolated from air and hydrogen, oxidization and bubbles of the aluminum and aluminum alloy melt are prevented, and bubbles and slag can be removed; the generating speed of the protective gas can be decreased through the hexafluoropropylene aluminate, and thus long-time generation of the protective gas can be facilitated; meanwhile, the impurities such as aluminum oxide can be dissolved through the hexafluoropropylene aluminate. In this way, by the adoption of the covering agent for aluminum and aluminum alloy smelting, the yield and purity of smelted aluminum or smelted aluminum alloy can be improved, and accordingly product quality and economic benefits are improved. The invention further relates to a preparing method of the covering agent for aluminum and aluminum alloy smelting.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of Al and Alalloy covering agent for smelting and preparation method thereof.
Background technology
Aluminium character is very active.Aluminium liquid or aluminum alloy melt in electrolysis, melting, pass on and easily to absorb gas in process and form slag inclusion, oxide film, pore, the other defect such as loose, thus reduce the purity of aluminium liquid or aluminum alloy melt, reduce the quality product such as purity, corrosive nature of product, also affect the process industrial art performance of Al and Alalloy simultaneously.Therefore, Al and Alalloy needs to use insulating covering agent to prevent oxidization burning loss and the air-breathing of metal melt in fusion process, improves purity and the quality product of aluminium or aluminium alloy.
At present less to the research of insulating covering agent, and there is following subject matter: 1, insulating covering agent can not produce protective gas and carries out active protection to molten aluminium (being aluminium liquid or aluminum alloy melt).2, insulating covering agent can not form very fine and close protective membrane at aluminium liquid or aluminum alloy melt surface, and therefore protected effect is bad.3, insulating covering agent dewaters thorough, and the moisture in insulating covering agent easily causes gas content in aluminium liquid to increase with reactive aluminum, and 4, current insulating covering agent generally do not possess slagging-off ability.
Summary of the invention
Based on this, be necessary that providing a kind of improves the purity of aluminium or aluminium alloy and the Al and Alalloy covering agent for smelting of quality product and preparation method thereof.
A kind of Al and Alalloy covering agent for smelting, by mass percentage, comprises following component: KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl, 2-20%
2, the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%.
Above-mentioned Al and Alalloy covering agent for smelting, good at the upper coverage effect of molten aluminium (namely comprising aluminium liquid or aluminum alloy melt), efficiently avoid the oxidation of molten aluminium and the absorption to gas; The molten aluminium that insulating covering agent is higher with temperature produces protective gas when contacting, and effectively Al and Alalloy melt and air, hydrogen is completely cut off, and prevents its oxidation or bubbles, and can degasification remove the gred; Hexafluoro aluminate can slow down the generation speed of protective gas, is conducive to the long-time generation of protective gas, and the guard time of protective gas is extended, simultaneously the inclusion such as hexafluoro aluminate energy dissolved oxygen aluminium, purification aluminium liquid or aluminum alloy melt.Thus above-mentioned Al and Alalloy covering agent for smelting can improve yield and the purity of melting aluminum or aluminum alloy, and then improves the quality of products and economic benefit.
Wherein in an embodiment, described hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.
Wherein in an embodiment, described hexafluoro aluminate is K
3alF
6and Na
3alF
6in one or both.
Wherein in an embodiment, by mass percentage, comprise following component: KCl and MgCl of total amount 55%
2, the NaCl of 20%, the CaF of 5%
2, 15% K
3alF
6and the Na of 5%
2siF
6.
A preparation method for Al and Alalloy covering agent for smelting, comprises the following steps:
Prepare mixture A and mixture B, wherein, by the mass percent in Al and Alalloy covering agent for smelting, described mixture A comprises KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2, described mixture B comprises the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%;
Described mixture A and described mixture B is mixed, obtains described Al and Alalloy covering agent for smelting.
Wherein in an embodiment, described hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.
Wherein in an embodiment, described hexafluoro aluminate is K
3alF
6and Na
3alF
6in one or both.
Wherein in an embodiment, by the mass percent in Al and Alalloy covering agent for smelting, described mixture A comprises KCl and MgCl of total amount 55%
2, the NaCl of the 20% and CaF of 5%
2, described mixture B comprises the K of 15%
3alF
6and the Na of 5%
2siF
6.
Wherein in an embodiment, the described step preparing mixture A is specially: by KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2mixing, fusing thoroughly removes moisture, and cooling crush obtains described mixture A.
Wherein in an embodiment, the raw material preparing described mixture B is that hexafluoro aluminate containing planar water or crystal water is or/and hexafluorosilicate, the described step preparing mixture B is specially: by containing planar water or/and the hexafluoro aluminate of crystal water and hexafluorosilicate mixing, fusing thoroughly removes moisture, and cooling crush obtains described mixture B.
Accompanying drawing explanation
Fig. 1 is the schema of the preparation method of the Al and Alalloy covering agent for smelting of an embodiment.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
The Al and Alalloy covering agent for smelting of one embodiment, by mass percentage, comprises following component: KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl, 2-20%
2, the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%.
Wherein, KCl, MgCl
2, NaCl and CaF
2can form fusing point low (700 DEG C), very little multiple phase of surface tension, makes insulating covering agent coverage effect on molten aluminium good, efficiently avoid the oxidation of molten aluminium and the absorption to gas.
Wherein, there is pyrolytic decomposition in temperature higher than when 300 DEG C in hexafluorosilicate, produces silicon fluoride gas.The temperature of the melting of Al and Alalloy is more than 300 DEG C; therefore when the molten aluminium that above-mentioned insulating covering agent is higher with temperature contacts; hexafluorosilicate produces silicon fluoride gas; Al and Alalloy melt and air, hydrogen completely cut off as protective gas by silicon fluoride gas effectively; prevent its oxidation or bubble, thus can degasification slagging-off.
Preferably, KCl and MgCl
2total amount in, KCl and MgCl
2mol ratio be 1:1.Wherein, KCl and MgCl
2can be provided by raw material carnallitite, the composition of carnallitite is the haloid deposit of potassium, magnesium, and chemical formula is KClMgCl
26H
2o.
Preferably, hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.Preferred, hexafluorosilicate is Na
2siF
6.Wherein, hexafluorosilicate can be provided by one or both in raw material potassium cryolite and sodium cryolite.
Wherein, hexafluoro aluminate can slow down hexafluorosilicate and produce the generation speed of protective gas, is conducive to the long-time generation of protective gas, the guard time of protective gas is extended, while the inclusion such as hexafluoro aluminate energy dissolved oxygen aluminium.
Preferably, hexafluoro aluminate is K
3alF
6(main component of potassium cryolite) and Na
3alF
6one or both in (main component of sodium cryolite).Preferred, hexafluoro aluminate is K
3alF
6.
Preferably, Al and Alalloy covering agent for smelting, by mass percentage, comprises following component: KCl and MgCl of total amount 55%
2, the NaCl of 20%, the CaF of 5%
2, 15% K
3alF
6and the Na of 5%
2siF
6.
Above-mentioned Al and Alalloy covering agent for smelting, on molten aluminium, coverage effect is good, efficiently avoid the oxidation of molten aluminium and the absorption to gas; The molten aluminium that insulating covering agent is higher with temperature produces protective gas when contacting, and effectively Al and Alalloy melt and air, hydrogen is completely cut off, and prevents its oxidation or bubbles, and can degasification remove the gred; Hexafluoro aluminate can slow down the generation speed of protective gas, is conducive to the long-time generation of protective gas, and the guard time of protective gas is extended, simultaneously the inclusion such as hexafluoro aluminate energy dissolved oxygen aluminium, purification aluminium liquid or aluminum alloy melt.Thus above-mentioned Al and Alalloy covering agent for smelting can improve yield and the purity of melting aluminum or aluminum alloy, and then improves the quality of products and economic benefit.
With reference to Fig. 1, present invention also offers the preparation method of the Al and Alalloy covering agent for smelting of an embodiment, comprise the following steps:
Step S100: prepare mixture A, wherein, by the mass percent in Al and Alalloy covering agent for smelting, mixture A comprises KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2.
Wherein in an embodiment, step S100 is specially: by KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2mixing, fusing, thoroughly remove moisture, cooling crush obtains mixture A.
Preferably, KCl and MgCl
2total amount in, KCl and MgCl
2mol ratio be 1:1.Wherein, KCl and MgCl
2can be provided by raw material carnallitite, the composition of carnallitite is the haloid deposit of potassium, magnesium, and chemical formula is KClMgCl
26H
2o.
KCl, MgCl
2, NaCl and CaF
2material melts completely, forms fusing point low (700 DEG C), very little multiple phase of surface tension, thus makes insulating covering agent coverage effect on molten aluminium good, efficiently avoid the oxidation of molten aluminium and the absorption to gas; And KCl, MgCl
2, NaCl and CaF
2dewatering thoroughly through high temperature melting, gas content in molten aluminium can not be made because of bringing moisture in insulating covering agent to increase.
Preferably, by the mass percent in Al and Alalloy covering agent for smelting, mixture A comprises KCl and MgCl of total amount 55%
2, the NaCl of the 20% and CaF of 5%
2.
Preferably, in the step preparing mixture A, melt thorough dewatered condition for be incubated 0.5-2 hour at 700-900 DEG C.
Preferred, the temperature of insulation is 800 DEG C, and soaking time is 1 hour.
Preferably, the temperature rise rate being heated to 700-900 DEG C is 2-5 DEG C/min.
Step S200: prepare mixture B, wherein, by the mass percent in Al and Alalloy covering agent for smelting, mixture B comprises the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%.
Wherein, the raw material preparing mixture B can be hexafluoro aluminate not containing planar water and crystal water and hexafluorosilicate, also can be the hexafluoro aluminate containing planar water or crystal water and hexafluorosilicate.
Wherein in an embodiment, the raw material preparing mixture B is containing planar water or/and the hexafluoro aluminate of crystal water is or/and hexafluorosilicate, step S200 is specially: by containing planar water or/and the hexafluoro aluminate of crystal water and hexafluorosilicate mixing, fusing thoroughly removes moisture, cooling crush obtains mixture B, wherein, by the mass percent in Al and Alalloy covering agent for smelting, mixture B comprises the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%.
By fluoaluminate and hexafluorosilicate mixed melting; be conducive to the abundant mixing of fluoaluminate and hexafluorosilicate; thus make hexafluoro aluminate can slow down the generation speed of protective gas better, be conducive to the long-time generation of protective gas, promote that the guard time of protective gas extends.
Preferably, hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.Be appreciated that hexafluorosilicate can be provided by one or both in raw material potassium cryolite and sodium cryolite.
Preferred, hexafluorosilicate is Na
2siF
6.
Preferably, hexafluoro aluminate is K
3alF
6and Na
3alF
6in one or both.Preferred, hexafluoro aluminate is K
3alF
6.
Preferably, by the mass percent in Al and Alalloy covering agent for smelting, mixture B comprises the K of 15%
3alF
6and the Na of 5%
2siF
6.
Preferably, in the step preparing mixture A, melt thorough dewatered condition for be incubated 1-4 hour at 200-300 DEG C, fully to remove moisture in insulating covering agent and crystal water, cause gas content in aluminium liquid to increase in order to avoid moisture and aluminium liquid react.Consider that the decomposition temperature of hexafluorosilicate is more than 300 DEG C, and the temperature of fusion of mixture A is higher, therefore by mixture A and mixture B separately preparation.
Preferred, the temperature of insulation is 300 DEG C, and the time of insulation is 2 hours.
Preferably, the temperature rise rate being heated to 200-300 DEG C is 2-5 DEG C/min.
Wherein in an embodiment, the raw material preparing mixture B is the hexafluoro aluminate and the hexafluorosilicate that do not contain planar water and crystal water, can adopt directly by hexafluoro aluminate and hexafluorosilicate mixing, also 1-4 hour can be incubated at 200-300 DEG C, mixed melting, cooling crush obtains mixture B.
Step S300: mixed by said mixture A and mixture B, obtains this Al and Alalloy covering agent for smelting.
Preferably, step S300 is specially: mixed by said mixture A and mixture B, crosses 20 mesh sieves, obtains the Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm.
Preferably, the Al and Alalloy covering agent for smelting sealing obtained is preserved.
Be appreciated that step S100 and step S200 does not have dividing of priority, carry out step S100 again after also can carrying out step S200, also can carry out simultaneously.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting, step is simple, sufficient raw, cost is low, the Al and Alalloy covering agent for smelting obtained, and dewaters thoroughly, on molten aluminium, coverage effect is good, efficiently avoid the oxidation of molten aluminium and the absorption to gas; The molten aluminium that insulating covering agent is higher with temperature produces protective gas when contacting, and effectively Al and Alalloy melt and air, hydrogen is completely cut off, and prevents its oxidation or bubbles, and can degasification remove the gred; Hexafluoro aluminate can slow down the generation speed of protective gas, is conducive to the long-time generation of protective gas, and the guard time of protective gas is extended, simultaneously the inclusion such as hexafluoro aluminate energy dissolved oxygen aluminium, purification aluminium liquid or aluminum alloy melt.Thus above-mentioned Al and Alalloy covering agent for smelting and preparation method thereof can widely use aborning, can improve the yield of melting aluminum or aluminum alloy, purity and quality product, and then increase economic efficiency.
It is below specific embodiment.
Embodiment 1
The Al and Alalloy covering agent for smelting of embodiment 1, by mass percentage, comprises following component: KCl and MgCl of total amount 55%
2, the NaCl of 20%, the CaF of 5%
2, 15% K
3alF
6and the Na of 5%
2siF
6, wherein KCl and MgCl
2mol ratio be 1:1.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting is prepared as follows:
By above-mentioned mass percent, by carnallitite, NaCl and CaF
2mixing, be heated to 800 DEG C with the temperature rise rate of 3 DEG C/min and be incubated 1 hour, cooling crush obtains mixture A.
By above-mentioned mass percent, by potassium cryolite and Na
2siF
6mixing, be heated to 300 DEG C with the temperature rise rate of 3 DEG C/min and be incubated 2 hours, cooling crush obtains mixture B.
Said mixture A and mixture B is mixed, crosses 20 mesh sieves, obtain the Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm, Seal and preservation.
Embodiment 2
The Al and Alalloy covering agent for smelting of embodiment 2, by mass percentage, comprises following component: KCl and MgCl of total amount 65%
2, the NaCl of 15%, the CaF of 2%
2, 8% K
3alF
6and the Na of 10%
2siF
6, wherein KCl and MgCl
2mol ratio be 1:1.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting is prepared as follows:
By above-mentioned mass percent, by carnallitite, NaCl and CaF
2mixing, be heated to 900 DEG C with the temperature rise rate of 5 DEG C/min and be incubated 0.5 hour, cooling crush obtains mixture A.
By above-mentioned mass percent, by sodium cryolite and K
2siF
6mixing, be heated to 280 DEG C with the temperature rise rate of 5 DEG C/min and be incubated 4 hours, cooling crush obtains mixture B.
Said mixture A and mixture B is mixed, crosses 20 mesh sieves, obtain the Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm, Seal and preservation.
Embodiment 3
The Al and Alalloy covering agent for smelting of embodiment 3, by mass percentage, comprises following component: KCl and MgCl of total amount 30%
2, the NaCl of 43%, the CaF of 20%
2, 5% Na
3alF
6and the Na of 2%
2siF
6, wherein KCl and MgCl
2mol ratio be 1:1.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting is prepared as follows:
By above-mentioned mass percent, by carnallitite, NaCl and CaF
2mixing, be heated to 700 DEG C with the temperature rise rate of 2 DEG C/min and be incubated 2 hours, cooling crush obtains mixture A.
By above-mentioned mass percent, by K
3alF
6and Na
2siF
6mixing, be heated to 300 DEG C with the temperature rise rate of 2 DEG C/min and be incubated 1 hour, cooling crush obtains mixture B.
Said mixture A and mixture B is mixed, crosses 20 mesh sieves, obtain this Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm, Seal and preservation.
Embodiment 4
The Al and Alalloy covering agent for smelting of embodiment 4, by mass percentage, comprises following component: KCl and MgCl of total amount 40%
2, the NaCl of 20%, the CaF of 5%
2, 20% K
3alF
6and the K of 10%
2siF
6, wherein KCl and MgCl
2mol ratio be 1:1.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting is prepared as follows:
By above-mentioned mass percent, by carnallitite, NaCl and CaF
2mixing, be heated to 700 DEG C with the temperature rise rate of 3 DEG C/min and be incubated 1 hour, cooling crush obtains mixture A.
By above-mentioned mass percent, by sodium cryolite and K
2siF
6mixing, be heated to 200 DEG C with the temperature rise rate of 5 DEG C/min and be incubated 2 hours, cooling crush obtains mixture B.
Said mixture A and mixture B is mixed, crosses 20 mesh sieves, obtain the Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm, Seal and preservation.
Embodiment 5
The Al and Alalloy covering agent for smelting of embodiment 5, by mass percentage, comprises following component: KCl and MgCl of total amount 30%
2, the NaCl of 55%, the CaF of 2%
2, 5% Na
3alF
6and the K of 5%
2siF
6, wherein KCl and MgCl
2mol ratio be 1:1.
The preparation method of above-mentioned Al and Alalloy covering agent for smelting is prepared as follows:
By above-mentioned mass percent, by carnallitite, NaCl and CaF
2mixing, be heated to 800 DEG C with the temperature rise rate of 5 DEG C/min and be incubated 0.5 hour, cooling crush obtains mixture A.
By above-mentioned mass percent, by Na
3alF
6and Na
2siF
6mixing, be heated to 260 DEG C with the temperature rise rate of 3 DEG C/min and be incubated 2 hours, cooling crush obtains mixture B.
Said mixture A and mixture B is mixed, crosses 20 mesh sieves, obtain the Al and Alalloy covering agent for smelting that particle diameter is less than 0.85mm, Seal and preservation.
Al and Alalloy covering agent for smelting prepared by embodiment 1, for smelting aluminum, yield, purity and quality product
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification sheets is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an Al and Alalloy covering agent for smelting, is characterized in that, by mass percentage, comprises following component: KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl, 2-20%
2, the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%.
2. Al and Alalloy covering agent for smelting as claimed in claim 1, it is characterized in that, described hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.
3. Al and Alalloy covering agent for smelting as claimed in claim 1 or 2, it is characterized in that, described hexafluoro aluminate is K
3alF
6and Na
3alF
6in one or both.
4. Al and Alalloy covering agent for smelting as claimed in claim 3, is characterized in that, by mass percentage, comprise following component: KCl and MgCl of total amount 55%
2, the NaCl of 20%, the CaF of 5%
2, 15% K
3alF
6and the Na of 5%
2siF
6.
5. a preparation method for Al and Alalloy covering agent for smelting, is characterized in that, comprises the following steps:
Prepare mixture A and mixture B, wherein, by the mass percent in Al and Alalloy covering agent for smelting, described mixture A comprises KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2, described mixture B comprises the hexafluoro aluminate of 5-20% and the hexafluorosilicate of 2-10%;
Described mixture A and described mixture B is mixed, obtains described Al and Alalloy covering agent for smelting.
6. the preparation method of Al and Alalloy covering agent for smelting as claimed in claim 5, it is characterized in that, described hexafluorosilicate is Na
2siF
6and K
2siF
6in one or both.
7. the preparation method of the Al and Alalloy covering agent for smelting as described in claim 5 or 6, is characterized in that, described hexafluoro aluminate is K
3alF
6and Na
3alF
6in one or both.
8. the preparation method of Al and Alalloy covering agent for smelting as claimed in claim 7, is characterized in that, by the mass percent in Al and Alalloy covering agent for smelting, described mixture A comprises KCl and MgCl of total amount 55%
2, the NaCl of the 20% and CaF of 5%
2, described mixture B comprises the K of 15%
3alF
6and the Na of 5%
2siF
6.
9. the preparation method of Al and Alalloy covering agent for smelting as claimed in claim 5, it is characterized in that, the described step preparing mixture A is specially: by KCl and MgCl of total amount 30-65%
2, 15-55% the CaF of NaCl and 2-20%
2mixing, fusing thoroughly removes moisture, and cooling crush obtains described mixture A.
10. the preparation method of Al and Alalloy covering agent for smelting as claimed in claim 5, it is characterized in that, the raw material preparing described mixture B is that hexafluoro aluminate containing planar water or crystal water is or/and hexafluorosilicate, the described step preparing mixture B is specially: by containing planar water or/and the hexafluoro aluminate of crystal water and hexafluorosilicate mixing, fusing thoroughly removes moisture, and cooling crush obtains described mixture B.
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| CN106191555A (en) * | 2016-07-25 | 2016-12-07 | 慈溪市宜美佳铝业有限公司 | A kind of silumin of Wear-resistant corrosion-resistant and preparation method thereof |
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