Principles of creating new alloy compositions for the production of cast protectors

Abstract

Aluminum protectors are used in cathodic systems for protecting metal structures from electrochemical corrosion. The materials of the article are devoted to the selection of elements for alloying aluminum, based on the analysis of physicochemical, technological and electrochemical characteristics of the alloy base and elements of the periodic system named after D.I. Mendeleev. Zn, Mg, Mn, Ti and Zr were selected as the main alloying components by the tendency of elements to alloy formation and to obtain a homogeneous structure, taking into account their effect on the anodic activity and resistivity of oxides on the metal surface. The obtained research results are in good agreement with the well-known international standards for the chemical compositions of aluminum tread alloys, for which magnesium, zinc, and manganese are present as the main alloying components. For experimental studies, Mg, Zn, Mn were chosen as alloying additives, and Si, Fe as impurities. The optimal the concentration range of the aluminum alloy will be as follows: for zinc, 3.6-5.4; for magnesium, 0.55-1.05; for manganese 0-0.3. The content of Si and Fe in the alloy is limited to 0.06 and 0.01%, respectively. The maximum value of the CUE - 75.78%.

The influence of technological factors on electrochemical characteristics of cast magnesium cathodic protective elements

“…It is well known that aluminum and zinc are used as the main alloying components in magnesium alloys [9][10][11][12][13]. The experience of using magnesium anode to protect metal structures from electrochemical corrosion shows that in operating conditions Mg-Al-Zn-Mn alloys, having close values of working potentials, differ significantly in their CC values (Table 2).…”