ELECTROCHEMICAL BEHAVIOR OF AlB₁₂–AlN COMPOSITES IN NATURAL ENVIRONMENTS

Abstract

Electrochemical processes occurring on ceramic composites in the AlB₁₂–AlN system induced by polarization in a 3% NaCl aqueous solution at 37 ºС were examined for the first time. Aluminum dodecaboride AlB₁₂ was found to dissolve but at such a low rate that it hardly influenced the material’s corrosion resistance in actual environments. A higher aluminum nitride amount in the composite increases its electrochemical corrosion resistance. The electrochemical behavior of aluminum dodecaboride and nitride ceramic composites generally allows the materials to retain their service properties in natural corrosive environments even at elevated temperatures.