Protecting alloy on base of aluminium

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy of protecting alloys on base of aluminium and can be implemented at production of protectors for aluminium heat exchangers on airplanes, sea and river vessels, domestic heaters and also fuselages of hydroplanes and vessels out of aluminium alloys for protection from corrosion. Protecting deformed alloy on aluminium base contains following components, wt %: zinc 1.8-3.0, magnesium 0.4-0.8, silicon 0.3-0.6, tin 0.03-0.07, indium 0.06-0.07, aluminium - the rest.

EFFECT: production of protecting alloy possessing upgraded mechanical properties which facilitates fabrication of protectors of various shape, small dimensions and big length.

2 tbl, 1 ex

 

The present invention relates to metallurgy sacrificial alloys based on aluminum and can be used in the manufacture of treads for corrosion protection of aluminum heat exchangers for aircraft, marine and freshwater courts, domestic heaters, as well as to protect the fuselage of seaplanes and boats from aluminum alloys.

Known sacrificial alloys based on aluminum, used for corrosion protection of metal constructions (AP1, AP, AP, AP4 according to GOST 26251-84). Close to the desired level on the electrochemical characteristics of these is the alloy AP4. However, it is not suitable for corrosion protection of heat exchangers and seaplanes. This is determined by the instability of the electrochemical characteristics in water with different conductivity, and low mechanical strength, which does not allow to make the protectors of the desired shape and size.

Known protective base alloy of aluminum containing zinc, manganese, indium, lead in the following ratio, wt.%:

Zinc3-5
Manganeseof 0.05-0.2
Lead0,2-0,6
Indies0,01-0,04
AluminumRest

(SU 1764327, CL SS 21/10, 10.10.95).

However, he does not have enough negative working electrode potential and, consequently, provides insufficient protection from corrosion products from aluminium alloys.

The closest in technical essence and the achieved effect is protective based alloy of aluminum containing zinc, indium, tin, zirconium in the following ratio, wt.%:

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

(EN 2263154, SS 21/10, 10.06.2005, prototype.

The disadvantages of this alloy, is used as a prototype include its low mechanical strength, which does not allow to make the protectors and ensure their reliable operation in heat exchangers and the fuselage of the seaplane. In addition, it has a relatively high speed camerastore, which does not allow continuous operation prot is Ktorov with limited size.

Features tread alloys based on aluminum containing zinc, magnesium, silicon, tin, indium in the following ratio, wt.%:

Zinc1,8-3,0
Magnesium0,4-0,8
Silicon0,3-0,6
Tin0,03-0,07
Indies0,06-0,07
AluminumRest

We offer alloy differs from the prototype in that it contains the following ratio of components, wt.%:

Zinc1,8-3,0
Magnesium0,4-0,8
Silicon0,3-0,6
Tin0,03-0,07
Indies0,06-0,07
AluminumRest

The proposed alloy allows to obtain a homogeneous solid solution with a uniform RA the distribution of dispersed intermetallic compounds with a close value of their electrode potential electrode potential matrix. This electrochemical protection in a pair of "product of aluminum alloy - tread aluminum alloy" is when in the passive region of both. The product operates at a potential of negative potential rittenhousetown, the protector is at a potential close to the potential rittenhousetown. As a result, the dissolution rate of both smaller than in the case of the prototype, which contributes to long-term reliable operation and products, and protector.

Introduction to the zinc alloy in a smaller amount than in the prototype while alloying magnesium and silicon allows to obtain protectors unlike the prototype not only the wheels, but also the deformation of the pressing of the ingots cast by the method of continuous casting. This allows to significantly increase the mechanical properties and get the protectors of various shapes, small size and great length (the longest protectors).

Examples of implementation

Method of continuous casting produced ingots (see table 1). They are then extruded at a temperature of 400°C with quenching on the press. After editing the stretching of the extruded strips offer alloy produced samples for testing.

In preparation for the experiments, the samples were slightly smoothed with an emery cloth, poisoned 0.5 minutes in 5% NaCl solution, washed the warm and cold water, was osvetleni a 30% solution of HNO30.5 minutes, washed and dried.

Also were tested alloy prototype.

Measurement of electrode potential was performed relative to silver chloride electrode and counted on the hydrogen scale. Protective characteristics were examined in pairs "protector (A) - protected alloy (To)". The compound was carried out bolts of the extruded alloy of identical protected. As this alloy was selected AMG. The ratio of the areas To the/And was taken equal to 10. Samples To and were weighed before and after testing. The solution is to remove corrosion products and evaluation of the results was attended by reference (control Methods and studies of light alloys. M.: metallurgy, 1985, s-430).

The compositions of the tested alloys and mechanical properties are shown in table 1, electrochemical and protective characteristics in table 2.

As follows from tables 1, 2, the proposed alloy has a higher mechanical properties. The rate of dissolution of the tread is significantly lower. So the rate of dissolution of the tread is in the range of 0.038-0,058 mm/year, while the rate of dissolution of the prototype 0,425 mm/year.

Similar results were obtained when the protection of the samples from alloy AD31, AMg6 and D16T, as well as on the pilot plant, simulating the corrosion behavior of heat exchangers for various IC is rastah motion solution.

Table 1
Used in the examples, the compositions and their mechanical properties on the proposed alloy and prototype
SOS-
Tav
Legend
nye
rooms
The content of elements, wt.%Mechanical properties
ZincMagician
deposits
SiliconIndiesTinZirconiaAluminium-
deposits
Tensile strength, σin,
MPa
The yield strength, σof 0.2, MPaElongation, δ, %
Pre-
the coining-
text
2,90,750,60,070,07-leave21016512
Know-
local Pro-
-
type
44--0,010,010,1OST70-18

Table 2
The results of the study of electrochemical and protective characteristics of the proposed alloy and prototype
CompositionConventional numbersStationary electrode potential, MBThe corrosion rate, mm/yearPointsGroup resistance
TreadAlloy AMGPROTEK-
Torah
Alloy AMGPROTEK-
Torah
Alloy AMG
H-
suggested
-
39100,0380,001943PersistentVery persistent
Known prototype48500,4250,03464Relative
sory persistent
Persistent

Thus, we offer alloy allows you to:

to improve the corrosion resistance of the protector and the protected object in 8-10 times and to increase the service life is 3-5 times;

to improve the mechanical properties of 3 times and accordingly to make the deformation of the receiving protectors of various shapes, sizes and length;

- to protect not only the hulls of ships, of aluminium alloys, air and marine heat exchangers and the fuselage of the hydroplanes;

to produce a lengthy protectors to protect gas and nefteprovoda is.

Tread alloys based on aluminum containing zinc, magnesium, silicon, tin, indium, characterized in that it is to improve the mechanical properties has the following content, wt.%:

Zinc1,8-3,0
Magnesium0,4-0,8
Silicon0,3-0,6
Tin0,03-0,07
Indies0,06-0,07
AluminumRest



 

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1 tbl

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2 cl, 1 ex, 3 tbl

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