Study of the oxidation process of metallic pigments in the presence of silicone resin under heating

Resumo

Oxidation of particles of Stapa 4 zinc paste and its composites with Stapa 1515 n. 1 aluminum paste, Silres MSE 100 silicone resin, and microtalc under heating in air was studied by differential-thermal and X-ray phase analyses and electron microscopy. The oxidation of zinc particles starts after a temperature of 330°C is reached, whereas in the presence of Silres MSE 100 resin, the process in which zinc particles are oxidized becomes substantially slower. The oxidation of aluminum particles in the Zn–Al–resin system begins at 560°C. Additional introduction of microtalc shifts the exothermic processes to higher temperatures. A composite was developed for a zinc-aluminum paint to be used to form heat-resistant coatings on metals.