Effect of calcium additives on the anodic behavior of the conductive aluminum alloy E-AlMgSi (Aldrey) in the medium of the NaCl electrolyte

Abstract

When creating new materials designed to work in particularly harsh conditions, the task of giving them corrosion resistance arises, the practical solution of which is associated with the level of knowledge in the field of high-temperature oxidation of metals and alloys. When using conductive aluminum alloys for the manufacture of thin wire, for example, winding wire, etc., certain difficulties may arise due to their insufficient strength and a small number of kinks before failure. In recent years, aluminum alloys have been developed, which even in a soft state have strength characteristics that allow them to be used as a conductor material. One of the conductive aluminum alloys is the E-AlMgSi alloy (Aldrey), which refers to thermally strengthened alloys. It is characterized by high strength and good ductility. This alloy under appropriate heat treatment acquires high electrical conductivity. The wires made from it are used almost exclusively for overhead power lines.The results of the study of the anodic behavior of the aluminum conductor alloy E-AlMgSi (Aldrey) with calcium, in an electrolyte medium of 0.03; 0.3 and 3.0% NaCl are presented. Corrosion-electrochemical study of alloys was carried out by the potentiostatic method on the PI-5.0-1.1 potentiostat at a potential sweep rate of 2 mV/s. It is shown that alloying the aluminum alloy E-AlMgSi (Aldrey) with calcium increases its corrosion resistance by 20%. The potentials of corrosion, pitting and repassivation of alloys during doping with calcium are shifted to the positive range of values, and from the concentration of sodium chloride in the negative direction of the ordinate axis.