Abstract
Two groups of pigments were obtained by coprecipitation in the Fe-Al-Mg-O system. With the help of experimental studies, the influence of cations of chromophores and heat treatment on the color tone, color purity, anti-corrosion properties of pigments in the Fe-Al-Mg-O system has been established, which allows further targeted synthesis of pigments in beige, red and yellow colors. It is shown that the main technological properties of pigments are determined by the anionic and cationic composition. Color characteristics are determined by the cation occupying a tetrahedral position in the crystal lattice. For all considered systems, an increase in covalence after heat treatment leads to a shift in color to the long-wavelength region of the spectrum and to an increase in color intensity. The anticorrosive properties of pigments are largely determined by the hydrolysis of the formed compounds. The protective effect is mainly determined by the slowing down of the anodic process. In this case, anions containing aluminum atoms accelerate corrosion processes.
Highlights
The field of use of materials with a spinel structure is expanding
It is of interest to carry out the synthesis in such a mode that would make it possible to obtain pigments with good color characteristics in a finely dispersed state, excluding the laborious stage of grinding
Traditional anticorrosive pigments containing lead or chromium cations are currently limited in use due to their negative impact on humans and the environment [18,19,20,21,22]
Summary
The field of use of materials with a spinel structure is expanding. These are pigments, magnetic carriers, sensors, catalysts, materials for supercapacitors [1–7.]. Important technological properties of pigments are their optical-color characteristics, which depend on the chromophore ions that make up the structure of the compounds obtained [26,27]. The purpose of this work was to study the regularities of the formation of anticorrosive properties, develop compositions for obtaining spinels using the method of co-precipitation and further heat treatment in the Fe-Al-Mg-O system.
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