Aluminum based protective alloy

FIELD: metallurgy.

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.

2 tbl

 

The invention relates to metallurgy sacrificial alloys based on aluminum and can be used in the manufacture of treads for corrosion protection of vessels from aluminum alloys.

Known sacrificial alloys based on aluminum, used for corrosion protection of metal constructions (see the grades AP1; AP; AP and AP4 according to GOST 26251-84). However, the known alloys do not provide reliable protection against corrosion of ship hulls made of aluminum alloys.

The analysis of domestic and foreign patent literature showed that the closest to the technical essence and composition of the components of the claimed composition is aluminum tread alloy brand AP4 according to GOST 26251-84, contains, wt%:

Magnesium0,5-1,0
Zinc2,5-4,5
Tinthe 0.05-0.1
Indies0,01-0,05
Gallium0,01-0,05
Iron0,10
Copper0,01
Silicon0,10
Aluminumrest

This alloy is recommended for production of protectors with high anodic activity (negative protective potential do mV) for corrosion protection of steel structures in environments with low electrical conductivity.

However, the known aluminum tread alloy is very complex to manufacture (includes five alloying elements, some of which, such as gallium, very poorly introduced into the molten aluminum) and does not provide stability and electrochemical performance. Over time on the surface of the tread is formed of a dense film of sludge with high resistance, which reduces the magnitude of the operating voltage (50-100 mV) and the coefficient of efficiency (KPI) alloy.

The aim of the present invention is to provide a new alloy, having a balanced chemical and phase compositions and with improved and stable in time electronegative protective capacity and efficiency compared with known similar that provides the ability to protect against corrosion of the hull aluminum boats.

This object is achieved by the introduction of the claimed composition of the optimal number of tin and zirconium. The stability of the electrochemical characteristics (operating voltage, efficiency) due to more fine-grained structure and a correspondingly more uniform dissolution at high anodic activity.

Features alloy containing, by weight.%:

Zinc4,0-5,0
Indies0,01-0,06
Tinof 0.01-0.1
Zirconiaof 0.01-0.1
Aluminumrest

The content of impurities in the alloy meets the requirements of GOST 26251-84 and does not exceed for iron and silicon 0.10% and for copper is 0.01%.

The ratio of alloying and modifying elements in the inventive composition is selected so that the structure and basic properties of the alloy provided the desired complex technological and operational characteristics of the generated protectors.

Introduction in the inventive alloy modifying additives Zirconia in a specified ratio with other elements improves its structural stability that provides a specified level of electrochemical and performance protectors at the time of their service, and therefore, provides reliable protection against corrosion of ship hulls made of aluminum alloys. Having the ability to increase the dispersion of the grain, the specified element significantly increases the constancy of the electrochemical characteristics of the amount of tread that provides a higher and stable efficiency and, ultimately, increases the service life of the security.

The main elements that cause is their depassivation aluminum (i.e. the increase in negative potential of aluminum alloys in seawater)are zinc and indium.

However, the increase in the content of zinc in the alloy more than 5% does not lead to a noticeable increase in negative potential, but at the same time, the high content of zinc leads to the release of zinc in a separate phase, which is cathodic to the matrix alloy (solid solution of zinc, indium and tin in aluminum). This fact dramatically reduces the CRPD alloy with increasing zinc content of more than 5%. The content of zinc in the alloy is less than 3.5% insufficient increases electronegative potential. These circumstances led to the clarification of the content of zinc in the alloy in a slightly different limits than the existing tread alloy.

The introduction of indium in the alloy increases electronegative potential, but dramatically reduces the CRPD. Due to the fact that indium, activating the alloy, causing excessive camerastore. To reduce the negative impacts of indium in the alloy is introduced tin, which to some extent reduces the corrosion rate of the alloy. It is very important to maintain the ratio of the content of indium and tin, because with the increased content of tin (>0.1%) and insufficient indium content (less than 0.01%) will alloy with high KPI, but not high electronegative potential. the ri reverse ratio will be high electronegative potential, but low KPI. In addition, indium is an expensive and scarce material and its high content leads to higher alloy.

Based on these considerations and the selected optimal content within India (0,01-0,06%) and tin (0,01-0,1%) in the claimed composition.

The exception of the composition of magnesium and gallium due to the fact that the presence of gallium, as research has shown, does not lead to noticeable improvements and electrochemical performance. At the same time it is bad is introduced into the molten aluminum and increases the cost of the alloy. Magnesium also has virtually no effect on the magnitude of the operating voltage, but promotes delamination of the aluminum alloy in seawater and reduces the amount of theoretical tomodachi that, ultimately, adversely affects the service life of tires.

Failure to adhere to these limits on the content of impurities (Fe; Si; Cu) leads to the reduction of the protective capacity and efficiency.

Metallographic examination showed that the claimed alloy is a homogeneous single-phase structure. The structure of the alloy fine. All this confirms the high electrochemical and operational characteristics of the claimed alloy.

Thus, created a new tread base alloy of aluminum with high anodic activity with stabilnymi in time and electrochemical performance characteristics.

In CRISM "Prometey" in accordance with the plan of scientific-research works carried out pilot work on the melting of the protectors of the master alloy grade. The metal was melted in induction furnaces with gravitational crucible of clean charge materials. The chemical composition of the investigated materials, as well as the results of determining necessary and electrochemical performance properties are shown in table 1 and 2.

Table 1
The chemical composition of the claimed and known alloys
CompositionThe conditional part numberThe content of elements, wt.%
zincmagnesiumtinIndiesgalliumZirconia
14,0-0,010,01-0,01
Declared24,5-0,050,03-0,05
35,0-0,100,06-0,10
Known 44,50,80,050,020,02-
Notes: 1. The base is aluminum. 2. The content of iron, copper and silicon in the alloy meets the requirements of GOST 26251-84 and does not exceed, respectively, 0.10, 0.01 and 0.10.

Table 2
The results of accelerated electrochemical tests claimed and known alloys
CompositionThe conditional part numberThe size of the working potential, mV (NUN.)The magnitude of the coefficient of efficiency, %The surface condition of the sample
in early testsafter 20 days
1-880-95088Dissolution
Declared2-885-86085has uniform
3-900-88082character
Known4-860-78070Dissolution has prawn is dimensional in nature

The expected technical and economic effect of the use of new technical solutions will help increase operational reliability and resources of the courts with aluminum alloys type AMG.

A tread base alloy of aluminum containing zinc, tin, indium and aluminum, characterized in that it further contains zirconium in the following content, wt.%:

Zinc4-5
Indies0,01-0,06
Tinof 0.01-0.1
Zirconiaof 0.01-0.1
AluminumRest



 

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FIELD: metallurgy.

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.

2 tbl

Aluminum-base alloy // 2280092

FIELD: metallurgy.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

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.

1 tbl

FIELD: metallurgy.

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.

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EFFECT: improved and valuable properties of alloy.

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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

Aluminum-base alloy // 2319762

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EFFECT: improved and valuable property of alloy.

1 tbl

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