Corrosion of aluminum conductive alloy E-AlMgSi (Aldrey) alloyed by indium

The effect of impurities on the electrical resistance of aluminum is well understood. It is known that the conductivity of aluminum is 65.45 % of the conductivity of copper. The tensile strength of aluminum wires is 150—170 MPa, which, with equal conductivity, is about 65 % of the strength of a copper wire. Such strength of aluminum wires is sufficient to support its own weight and may be insufficient when overloaded with snow, ice or wind.

One of the ways to increase the strength of aluminum wires is the use of aluminum alloys having increased strength with a sufficiently high conductivity. One representative of the group of such alloys is the alloy E-AlMgSi (Aldrey). The main hardener of this alloy is the Mg₂Si phase, which gives aluminum high mechanical properties.

The paper presents the results of a study of the kinetics of high-temperature oxidation and electrochemical corrosion of indium-doped aluminum conductor alloy E-AlMgSi (Aldrey). Using thermogravimetry, it was shown that indium additives and temperature increase the oxidizability of the E-AlMgSi alloy (Aldrey). In this case, the apparent activation energy of the oxidation of alloys decreases from 120.5 to 91.8 kJ/mol. The oxidation rate of alloys determined by the potentiostatic method in a NaCl electrolyte showed that the corrosion resistance of alloys with indium is 20—30 % higher than that of the original alloy. With increasing concentration of NaCl electrolyte in the electrochemical potentials of the alloys decrease, the corrosion rate increases regardless of their composition.

aluminum alloy E-AlMgSi (Aldrey), thermogravimetric method, potentiostatic method, oxidation rate, apparent activation energy, NaCl electrolyte, corrosion and pitting potentials, corrosion rate

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