Synthesis, characterization and application of some nanosized mixed metal oxides as high heat resistant pigments: Ca2CuO3, Ca3Co2O6, and NiSb2O6

Mixed metal oxides have been widely used for various applications such as pigments in coatings. This work presents synthesis of a group of mixed metal oxides (Ca2CuO3, Ca3Co2O6 and NiSb2O6) by employing two simple synthesis techniques namely; co-precipitation and solid-state calcination method. The prepared pigments were characterized using X-ray diffraction, infra-red spectroscopy, and scanning electron microscopy. The obtained XRD results showed that single phase double oxide compounds were the main components in each case. SEM images showed the formation of either platelet or well defined polyhedron crystal structures based on the type of the double oxide and the preparation method. The physical, mechanical, heat and corrosion resistance of dry paint films were also examined. The obtained results revealed that the prepared calcium based pigments showed excellent heat and corrosion resistance and that with copper oxide is the best in performance among others.

Graphical abstractMixed metal oxides have been widely used for various applications such as pigments in coatings. This work presents synthesis of a group of mixed metal oxides (Ca2CuO3, Ca3Co2O6 and NiSb2O6) by employing two simple synthesis techniques namely; co-precipitation and solid-state calcinations methods. The prepared pigments were characterized using X-ray diffraction, infra-red spectroscopy, and scanning electron microscopy. The obtained XRD results showed that single phase double oxide compounds were the main components in each case. SEM images showed the formation of either platelet or well defined polyhedron crystal structures based on the type of the double oxide and the preparation method. The physical, mechanical, heat and corrosion resistance of dry paint films were also examined. The obtained results revealed that the prepared calcium based pigments showed excellent heat and corrosion resistance and that with copper oxide is the best in performance among others.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis of single phase mixed metal oxide pigments by two simple methods; co-precipitation and solid state reaction. ► The painted films using the prepared pigments showed high heat resistant up to 600 °C. ► The painted films over mild steel sheets showed high corrosion resistant characteristics in 5% NaCl salt solution for 500 h.