E-AlMgSi (Aldrey) aluminum conductive alloy with the solid state cadmium oxidation kinetics

Abstract

In the development of new materials designed for use under particularly harsh conditions, the task of making them corrosion-resistant arises. The practical solution to this task correlates with knowledge in the field of high-temperature oxidation of metals and alloys. When using conductive aluminum alloys for the production of fine wires, such as winding wire, certain difficulties may arise due to their insufficient mechanical strength and inflection before breaking. The solution of modern technological problems is associated with the use of highly oxidation- resistant materials. As a consequence, the study of the interaction of oxygen with metals and alloys has become very important due to the widespread use of new materials with special physical and chemical properties. The E-AlMgSi (Aldrey) aluminum conductive alloy occupies a special place among others. The oxidation process of the alloys was studied under isothermal air atmosphere by thermogravimetric method with continuous fixation of the sample mass for 1 h at temperatures of 723, 773 and 823 K. The oxidation kinetics curves and the value dependencies of the specific mass increase of cadmium in the E-AlMgSi (Aldrey) alloy quantity, time and temperature were constructed on the experimental data basis. The processing of the quadratic kinetic curves of the oxidation of the alloys at the above temperatures has shown that the oxidation of the alloys obeys the hyperbolic dependence y = kxn, where the value of n varies from 1 to 4. The lg k dependence on 1/T for the alloy E-AlMgSi (Aldrey) with cadmium shows that the oxidation rate increases with temperature and cadmium content increasing.