ANODIC BEHAVIOR OF ALUMINUM ALLOY AlMg5.5Li2.1Zr0.15 DOPED WITH CALCIUM IN THE ELECTROLYTE MEDIUM OF NaCl

Abstract

Duralumin alloy is widely used in the aircraft industry, in the production of high-speed trains (for example, Shinkansen trains) and in many other branches of mechanical engineering (since it is significantly more durable than pure aluminum). Along with high operational properties, the diverse use of duralumin is due to its high technological efficiency, which creates prerequisites for obtaining products by all known methods of casting and plastic processing. Duralumin belongs to the category of structural alloys, which are characterized by increased strength. They are based on aluminum. Copper, manganese, and magnesium are used as additives in different percentages. The properties of duralumin depend on the heat treatment and the amount of alloying elements added. The article presents the results of a study of the effect of calcium on the anodic behavior of aluminum alloy АlМg5.5Li2.1Zr0.15 of the duralumin type in the medium of the NaCl electrolyte. The study of the corrosion−electrochemical behavior of alloys was carried out by a potentiostatic method in a potentiodynamic mode with a potential sweep rate of 2 mV ⋅ s ^(-1). It is shown that calcium additives reduce the rate of anodic corrosion of the initial alloy АlМg5.5Li2.1Zr0.15 by 8-10%. It was found that an increase in the concentration of chloride ions contributes to an increase in the rate of anodic corrosion regardless of the calcium content in the alloy АlМg5.5Li2.1Zr0.15.