Aluminium-based protective alloy

FIELD: metallurgy.

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.

1 tbl

 

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. %:

zinc4,0-6,0
manganese of 0.1-0.3
magnesium0,5-2,5
titaniumof 0.01-0.1
calcium0,005-0,01,
aluminumrest
when restricting the content of impurities, not more, mass %:
iron0,1
copper0,01
silicon0,1
hydrogen0,35 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.

Table 1
No. SPL-
VA
The content of elements, %Electrochemical-
the cue features
AlZnMPMgTiCAHydrogen, cm3/100 g Me- ΦpmVThe CRPD %
1 A. C. 263158rest17,5-200,25-04--4,3-5,3-710-72570-80
Impurity, not more than: 0,22 Fe; 0,4 Si; 0,001 Cu
2and4,20,120,70,0180,0050,1272479
b0,3472278
in0,5172070
3andthe 5.70,282,20,0910,0090,1872880
b0,3272679
in0,4872274
4and5,20,200,9 0,0260,0070,0973082
b0,2972879
in0,5372271
5and4,80,240,70,0540,0050,0772680
bto 0.03272478
in0,5172073

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. %:

of 0.1-0.3
zinc4-6
manganese
magnesium0,5-2,5
titaniumof 0.01-0.1
calcium0,005-0,01
impurities:
ironnot more than 0.1
coppernot more than 0.01
siliconnot more than 0.1
hydrogennot more than 0.35 cm3/100g metal
aluminumrest



 

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1 tbl

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EFFECT: improved and valuable property of alloy.

1 tbl

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