Aluminium-based protective alloy
SUBSTANCE: alloy contains the following, wt %: zinc - 4.0-6.0, manganese - 0.1-0.3, magnesium - 0.5-2.5, titanium - 0.01-0.1, calcium - 0.005-0.01, aluminium is the rest at the following limitation of content of impurities: iron is not more than 0.1, copper is not more than 0.01, silicone is not more than 0.1, hydrogen is not more than 0.35 cm3/100g of metal.
EFFECT: providing high electrochemical characteristics and excluding a risk of passivation of surface of cast protectors made from the proposed alloy; increasing tensile strength limit of an alloy.
The invention relates to metallurgy sacrificial alloys based on aluminum and can be used in the manufacture of treads for corrosion protection of metal constructions and structures.
Numerous compositions sacrificial alloys based on aluminum, widely used as a material protectors for corrosion protection of steel structures.
Known protective alloy based on aluminum, which contains, in wt.% zinc 4-6, manganese 0,02-0, impurity, not more than: iron 0,1, silicon 0,1, aluminum - rest (alloy AP1, GOST 26251-84). The alloy has the following electrochemical characteristics: operating voltage - 715-730 mV; theoretical tomodachi - 2880 a·h/kg, the coefficient of efficiency is 75-80%.
The disadvantages of sacrificial alloy is unstable in time electronegative potential of the properties and characteristics of the alloy, low strength characteristics, not allowing to make of them protectors complex structure (long, not having a steel core throughout the length).
Known protective alloy based on aluminum, which contains, in wt.%: zinc 17,5-20, manganese 0.25 to 0.4, calcium 4,3-5,3, impurity, not more than: iron 0,25, silicon, 0.5 to copper 0,001, aluminum - rest (A. C. USSR N 263158, SS 21/00, 1970, BI No. 7).
The disadvantages of the above tread the Plava is instability in time electronegative potential, the properties and characteristics of the alloy caused by the presence of chemical and structural heterogeneity in the casting due to the high content of alloying components (zinc, calcium), released in a separate phase (often cathode compared to the base alloy and intermetallic inclusions.
The objective of the invention is to provide an alloy with high and stable over time electronegative protective capacity and efficiency, increased durability by reducing chemical and structural inhomogeneity and porosity of cast protectors that provides effective protection against corrosion of metal structures.
The technical result consists in providing a sufficiently high electrochemical characteristics and to eliminate the risk of surface passivation cast protectors, made from the proposed alloy, and increase the tensile strength of the alloy. This technical result is achieved by the fact that the alloy comprising aluminum, zinc, manganese and calcium, it also contains titanium and magnesium in the following ratio, wt. %:
|when restricting the content of impurities, not more, mass %:|
|hydrogen||0,35 cm3/100 g IU|
We offer alloy has the following electrochemical characteristics:
operating voltage - 720-730 mV;
theoretical tomodachi - 2870-2890 a·h/kg;
the coefficient of efficiency (KPI) - 78-82%
Due to the zinc in the range of 4-6 wt.% this alloy can be used as a protector in maloprodaja and does not contain chlorides environments.
Magnesium shifts the electrochemical potential in the negative direction, and prevents passivation of the aluminum material by activation of the surface layer of the tread.
The presence of manganese in the range of 0.1-0.3 neutralizes the harmful effects of VC is for due to the reduced susceptibility of aluminum alloys to intergranular corrosion and stress corrosion.
The calcium in these quantities also neutralizes the harmful effects of iron, has a modifying effect of crystallization on a granular structure, thereby increasing the yield strength, ultimate tensile strength. Calcium supplements are shifting the potential of the aluminum alloy in the negative region, prevent passivation of the surface of the aluminum sacrificial alloy in the process of a protector.
Titanium, being present even in small quantities, significantly increases the solubility of hydrogen in aluminum. Under different conditions the titanium actively dissolves and forms hydrides of variable composition. Thus there is neutralization of free hydrogen in aluminum alloy. Also, doping of titanium increases the strength characteristics of aluminum alloy.
Cathodic impurities (iron, silicon, copper) with the increase of their content in the tread alloys above the permissible values significantly reduce the basic electrochemical properties of aluminium sacrificial alloy due to structural discontinuities in castings, standing out in separate phases and intermetallic inclusions.
Limiting the hydrogen content in the proposed alloy is connected with the negative impact generated during the production of cast protectors, gas porosity, which pic is of bstweet uneven them pinpoint the nature of the dissolution, that leads to lower tomodachi and, consequently, to a decrease in the service life of tires.
For the experiment were used based alloys of aluminum containing iron not more than 0.01%, silicon not more than 0.1% copper, not more than 0.01% with various alloying components in the claimed range. The alloys were prepared in gravitometric crucible resistance furnace. The process of making alloys was carried out as follows: melted aluminum, successively introduced the calculated amounts of manganese, alloys of aluminium, titanium and aluminium-calcium. Next was introduced zinc and magnesium. After melting all the components of the charge were melt mixing. Then spent refining the melt by purging with argon for 10 minutes (min), followed by exposure at temperatures 730-740°C for 10-15 minutes Before pouring the alloy melt surface was cleaned from slag and oxide inclusions. Next were casting alloys. Chemical composition and electrochemical characteristics of the experimental alloys are given in table.1.
As can be seen from the table.1, the alloys No. 2-5(a,b) containing alloying components in the claimed limits, have consistently high electrochemical characteristics, with the largest divergence characteristics are alloys with hydrogen content above stated (alloy No. 2-5B). The best characteristics of the AZAL alloy No. 3A.
The use of the alloy compared to the prototype (alloy 1) will apply moulded protectors with more stable electrochemical performance and high service life of sacrificial materials under operating conditions.
|The content of elements, %||Electrochemical-|
the cue features
|Al||Zn||MP||Mg||Ti||CA||Hydrogen, cm3/100 g Me||- ΦpmV||The CRPD %|
|1 A. C. 263158||rest||17,5-20||0,25-04||-||-||4,3-5,3||-||710-725||70-80|
|Impurity, not more than: 0,22 Fe; 0,4 Si; 0,001 Cu|
A tread base alloy of aluminum containing zinc, manganese, calcium and impurities, characterized in that it additionally contains titanium and magnesium in the following ratio, wt. %:
|iron||not more than 0.1|
|copper||not more than 0.01|
|silicon||not more than 0.1|
|hydrogen||not more than 0.35 cm3/100g metal|
SUBSTANCE: welded aluminium alloy contains, by wt %: zinc 3.8-5.3; magnesium 1.2-2.0; manganese 0.91-1.3; chrome 0.12-0.40; zirconium 0.07-0.15; copper 0.10-0.30; iron ≤ 0.35; silicium ≤ 0.35; vanadium 0.01-0.12; boron 0.01-0.12; nickel ≤ 0.05; calcium ≤ 0.05; aluminium - the rest, at the total contents of zinc and magnesium 5.0-7.3 by wt % and the ratio between the contents of zinc and magnesium - 1.90-4.58.
EFFECT: creation of welded aluminium alloy for the armoured skin, which provides at a high corrosion stability of the armoured skin, increase of safe level increase of resistance to formation of back chips.
SUBSTANCE: invention relates to constructional elements from aluminium alloy, in particular, for space industry. The slab is made with the thickness at least 4 inches from aluminium alloy, which contains (wt %): Zn - from 6.4 up to 8.5, Mg - from 1.4 up to 1.9, Cu - from 1.4 up to 1.85, Zr - from 0.05 up to 0.15, Ti - from 0.01 up to 0.06, Fe - up to 0.15, Si - up to 0.12, the rest is aluminium, accompanying elements and impurities.
EFFECT: improved combination of durability and resistance to fracturing is provided, and also the resistance to a fracturing as a result of stress corrosion is provided, especially in conditions of marine atmosphere.
10 cl, 14 dwg, 14 tbl, 3 ex
SUBSTANCE: method to produce axisymmetric forgings of a cover type with a diameter of up to 200 mm from high-strength aluminium alloys Al-Zn-Mg-Cu, alloyed with scandium and zirconium, includes preparation of aluminium melt, containing scandium and zirconium, its reheating to 765-780°C, casting of round bars of small diameter at 710-740°C, their homogenisation at 400-440°C for 4-10 hours, stamping at 380-440°C, tempering from temperature 465-480°C with even cooling of the entire surface of forgings with speed providing for preservation of fully non-crystallised structure of the forging after tempering, and artificial ageing.
EFFECT: forgings have lower level of residual tempering stresses, which provides for stability of geometric parameters of parts due to elimination of ovalisation when turning forgings into thin-walled parts.
2 tbl, 1 ex
SUBSTANCE: proposed composition contains the following substances, in wt %: zinc - 6.0-8.0; magnesium - 3.4-4.2; copper - 0.8-1.3; scandium - 0.07-0.15; zirconium - 0.08-0.12; beryllium - 0.0005-0.004; cerium - 0.01-0.15; titanium - 0.02-0.08; silicon - 0.01-0.15; iron - 0.01-0.15; hydrogen - 0.05-0.35 cm3/100 g of metal; unavoidable impurities from the group including Mn, Cr, V, Mo, Li, Ag, K, Na, O in total amount of not over 0.10, aluminium making the rest at the ratio of magnesium-to-zinc content making 0.53-0.57.
EFFECT: higher strength of Al-Zn-Mg-Cu-system alloys and articles.
2 cl, 1 ex, 2 tbl
SUBSTANCE: invention refers to active material of negative electrode for electric device containing an alloy with composition formula SixZnyAlz, where each of x, y and z is mass percentage meeting the following: (1) x+y+z=100, (2) 26≤x≤47, (3) 18≤y≤44 and (4) 22≤z≤46. Also invention refers to electrical device and negative electrode for it.
EFFECT: providing active material of negative electrode for electrical device such as lithium-ion accumulator battery providing well-balanced properties of high cycling conservation and high initial capacity.
4 cl, 2 tbl, 10 dwg, 2 ex
SUBSTANCE: 50-305 mm-thick article is made from alloy of the following chemical composition, in wt %: Zn - 3-11, Mg - 1-3, Cu - 0.9-3, Ge - 0.03-0.4, Si - not over 0.5, Fe - not over 0.5, Ti - not over 0.3, aluminium and common or unavoidable elements and impurities making the rest. Proposed method comprises slab casting, heating and/or annealing treatment of cast slab, slab hot treatment, optional cold treatment, heat processing to solid solution of slab (PSS), cooling of PSS slab, optional expansion or compression of cooled PSS slab or any other cold treatment of PSS slab to remove strain, ageing of cooled PSS slab to reach required state.
EFFECT: high hardness, ductility and lower sensitive to quenching.
20 cl, 2 tbl, 1 ex
SUBSTANCE: aluminium-based alloy is used for production of strained semis as forgings and tubes for gas centrifuges, low-pressure compressors, vacuum molecular pumps and heavy-duty units operated at mildly increased temperatures. Proposed composition contains the following substances, in wt %: zinc - 6.6-7.4, magnesium - 3.2-4.0, copper - 0.8-1.4, scandium - 0.12-0.30, zirconium - 0.06-0.20, beryllium - 0.0001-0.005, cobalt - 0.05-0.15, nickel - 0.35-0.65, iron - 0.25-0.65, aluminium making - the rest.
EFFECT: higher strength at sufficient ductility and reduce density of alloy.
1 ex, 3 tbl
SUBSTANCE: proposed method comprises casting the ingots of alloy containing the following components in wt %: zinc - 6.-4.1, magnesium - 0.6-1.1, manganese - 0.2-0.5, zirconium - 0.05-0.12, chromium - 0.05-0.15, copper - 0.1 -0.2, titanium - 0.01 -0.06, molybdenum - 0.01 -0.06, aluminium making the rest, at the temperature of 690-710°C and casting rate of 25-50 mm/min. Ingots are homogenised at 450-470°C for 8-12 hours and subjected to hot forming at 10-530°C and outflow rate of 0.1-4.0 m/min. Besides it includes air or air-water mix quenching and two-step ageing: at 90-110°C for 6-12 hours and at 160-190°C for 4-10 hours.
EFFECT: production of log parts with high operating properties.
4 cl, 1 ex, 6 tbl, 4 dwg
SUBSTANCE: alloy contains, wt %: 3.5-4.5 zinc, 3.5-4.5 magnesium, 0.6-1.0 copper, 2.0-3.0 nickel, 0.25-0.3 zirconium, aluminium - balance, at the same time after strengthening thermal treatment the alloy has yield point of 570 MPa, strength limit of 600 MPa, hardness of 160 HY, and after deformation at 440-480°C with speed of 0.001-0.01 1/s the alloy has elongation of more than 500%.
EFFECT: production of alloy with equiaxial homogeneous fine-grain structure.
SUBSTANCE: alloy contains the following, wt %: silicon 6.6-7.4, magnesium 0.31-0.45, copper 0.18-0.32, manganese 0.15-0.45, iron 0.15-0.4, aluminium is the rest, at that, the alloy has liquidus temperature within 608 to 620°C; temperature of balanced solidus of not less than 552°C and structure after heat treatment as per mode T66, which contains the amount of inclusions of silicon phase within 6.4 to 7.5 vol. %; iron in the alloy structure is completely bound to skeletal inclusions of phase Al15(Fe,Mn)3Si2, and magnesium is completely bound to secondary extractions of phase Al15Cu2Mg8Si6.
EFFECT: creation of alloy for obtaining high-duty shaped castings and having high technological and operating characteristics.
2 cl, 2 tbl, 2 ex, 2 dwg
SUBSTANCE: aluminum based protective alloy comprises, in mass %, 4-5 of zinc, 0.01-0.06 of indium, 0.01-0.1 solder, 0.01-0.1 of zirconium, and aluminum the remainder.
EFFECT: enhanced corrosion protection.
SUBSTANCE: invention relates to aluminum-base alloys used for making deformed semifinished products used in industry and building. Proposed alloy comprises the following components, wt.-%: zinc, 4.5-5.6; magnesium, 1.6-2.1; manganese, 0.2-0.8; scandium, 0.03-0.09; zirconium, 0.05-0.12; copper, 0.1-0.3; titanium, 0.01-0.07; molybdenum, 0.01-0.07; cerium, 0.001-0.01, and aluminum, the balance, wherein the ratio content of zinc to magnesium = 2.6-2.9. Invention provides the development of alloy providing enhancing corrosion resistance of articles.
EFFECT: improved and valuable properties of alloy.
2 tbl, 1 ex
FIELD: metallurgy of aluminum alloys; manufacture of wrought semi-finished products for transport engineering and other industries.
SUBSTANCE: proposed alloy includes the following components, mass-%: zinc, 3.6-4.1; magnesium, 0.6-1.1; manganese, 0.2-0.5; zirconium, 0.05-0.12; chromium, 0.05-0.15; copper, 0.1-0.2; titanium, 0.01-0.06; molybdenum, 0.01-0.06; the remainder being aluminum.
EFFECT: enhanced corrosion resistance and technological ductility of semi-finished items at plastic metal working.
2 tbl, 1 ex
SUBSTANCE: invention relates to aluminum-base material. Proposed material comprises the following components, wt.-%: zinc, 6-8; magnesium, 2.5-3.5; nickel, 0.6-1.4; iron, 0.4-1.0; silicon, 0.02-0.2; zirconium, 0.1-0.3; scandium, 0.05-0.2, and aluminum, the balance wherein the temperature of equilibrium solidus of material is 540°C, not less, the hardness value of material is 200 HV, not less. Invention provides the development of the novel high-strength material designated for both producing fashioned ingots and deformed semifinished product possessing high mechanical properties. Invention can be used in making articles working under effect of high loading, such as car articles and sport inventory articles.
EFFECT: improved and valuable properties of material.
4 cl, 2 dwg, 4 tbl, 3 ex
FIELD: nonferrous metallurgy.
SUBSTANCE: invention relates to ultrastrong economically alloyed aluminum-based alloys belonging to system Al-Zn-Mg-Cu. Alloy and article made therefrom are, in particular, composed of, %: zinc 3.5-4.85, copper 0.3-1.0, magnesium 1.2-2.2, manganese 0.15-0.6, chromium 0.01-0.3, iron 0.01-0.15, silicon 0.01-0.12, scandium 0.05-0.4, at least one element from group: zirconium 0.05-0.15, cerium 0.005-0.25, and aluminum - the rest.
EFFECT: increased characteristics of corrosion resistance, bondability with all welding techniques, and lowered fatigue crack growth rate.
2 cl, 2 tbl
SUBSTANCE: invention proposes alloy containing the following components, wt.-%: zinc, 5.4-6.2; magnesium, 2.51-3.0; manganese, 0.1-0.3; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; sodium, 0.0001-0.0008; copper, 0.2, not above; iron, 0.3, not above; silicon, 0.2, not above, and aluminum, the balance. Alloy provides enhancing uniformity of armor structure and its welded seams, stable armor resistance of extended armor welded seams independently on disposition of units to bed welded, elimination of splits from armor rear site in case its resistance to a missile impact, elimination possibility for reducing tenacity of armor during its exploitation including using under conditions of combination with dynamic protection of armored-body and armor-carrying mechanized objects. Invention can be used in producing armor for individual protection and for protection of mechanized armor-carrying objects against effecting agents.
EFFECT: improved and valuable properties of alloy.
SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; boron, 0.0003-0.003; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing the armor structure uniformity and its welded joints, to provide stable armor resistance of extended welded joints of armor and independently of location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by a missile, to exclude possibility for decreasing tenacity of armor in exploitation including using under conditions of combination with external dynamic protection of armored-carcass and armored-carrying mechanized objects. Invention can be used in producing armor for armored-carrying equipment for protection against effect of affection agents.
EFFECT: improved and valuable technical properties of alloy.
SUBSTANCE: invention proposes alloy comprising the following components, wt.-%: zinc, 4.7-5.3; magnesium, 2.1-2.6; manganese, 0.05-0.15; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; iron, 0.05-0.35; silicon, 0.05-0.25; sodium, 0.0001-0.0008; copper, 0.2, not above, and aluminum, the balance. Proposed alloy provides enhancing armor structure uniformity and its welded joins, to provides stable armor resistance of armor welded joints being independently on location of units to be welded, to exclude splitting off from rear side of armor in case armor not piercing by missile, to provide high tenacity of armor including its using under conditions of combination with external dynamic protection of armored-carcass and armor-carrying mechanized objects. Invention can be used in producing armor for armor-carrying equipment for its protection against protection of affecting agents.
EFFECT: improved and valuable properties of alloy.
SUBSTANCE: the present innovation deals with obtaining aluminum-based alloys necessary for manufacturing stampings, particularly those of automobile wheels disks. The alloy in question has got the following composition, weight%: copper 0.8-2.2; magnesium 1.2-2.6; manganese 0.2-0.6; iron ≤0.25; silicon ≤0.20; zinc 5.0-6.8; titanium ≤0.1; chromium 0.08-0.17; zirconium 0.01÷0.12; boron 0.0008-0.005; antimony 2.5-3.5; indium 2.5-3.5; boron 0.4-0.5; hydrogen (0.3-4.1)10-5, aluminum - the rest. The alloy in question is of optimal combination of strength and plasticity that guarantee the required level of performance characteristics of automobile wheels disks, the decrease of their weight in combination with high technological effectiveness at volumetric stamping, especially complex-shaped articles.
EFFECT: higher strength and plasticity of the alloy.
2 cl, 1 ex, 3 tbl
FIELD: metallurgy, alloys.
SUBSTANCE: invention relates to compositions of deformable aluminum-base alloys. Proposed alloy comprises the following components, wt.-%: zinc, 5.0-7.0; magnesium, 0.4-0.8; copper, 0.8-1.2; manganese, 0.8-1.2; zirconium, 0.2-0.3; titanium, 0.2-0.3; niobium, 0.2-0.3; nickel, 3.0-5.0; boron, 0.02-0.03, and aluminum, the balance. Proposed alloy possesses the enhanced strength. Proposed alloys can be used in aircraft construction and automobile construction.
EFFECT: improved and valuable property of alloy.