Evaluation of the anticorrosive performance of epoxy coatings containing new core/shell pigments

Abstract

Purpose Core-shell is structured particles having several chemical compositions. The advantage of these particles arise from their specific design, to be used in decreasing costs by using inexpensive material (natural ore or waste material) as carrier for thin shell of active material. This study aims to prepare ferrites/silica core-shell pigments and compare their inhibition efficiency to original ferrites. These pigments have shells of different ferrites that comprise 10-15 per cent of the prepared pigments on silica fume. Silica fume which is the core is a byproduct in the ferro–silicon industry; this core comprises 85-90 per cent of the prepared pigments. Design/methodology/approach The prepared core-shell pigments were characterized using transmission electron microscopy analysis, energy-dispersive X-ray analysis and sequential wavelength dispersive X-ray fluorescence. These pigments were integrated in epoxy-based paint formulations, and the physical, mechanical and corrosion properties of dry films were examined. The corrosion properties were studied by using immersion test in 3.5 per cent NaCl for 28 days. Findings This study showed that these new eco-friendly and inexpensive pigments are similar to ferrites in their inhibition performance, i.e. they exhibited high corrosion prevention. Research limitations/implications Domestic waste materials were reused in paints and only simple modification was used, and then, their effectiveness showed similar performance to that of the original pigments. Originality/value Ferrite and ferrite/silica pigments are environmentally friendly pigments that can replace other hazardous pigments (e.g. chromates) with almost the same quality in their performance; also, they can be used in industries other than paints (e.g. paper, rubber and plastics composites).

Evaluation of the anti-erosion performance of PLA and ABS materials with two different micro textures

“…It might be because of the continuous shelling of erodents over both materials. Similar trends were also observed by the investigators like Bobrin et al (2022) and Ahmed et al (2018).…”

Complex oxides – non-toxic pigments for anticorrosive coatings

“…However, the lamellar ferrites showed, in general, better corrosion protection efficiency than the core-shell ferrites, double-cation ferrite pigments with the composition Mg 02 Zn 08 Fe 2 O 4of both the lamellar and core-shell typewere most effective against corrosion (Figure 5). Ahmed et al (2018) undertook a study of the ability of shell ferritic pigments with silicon dioxide core, constituting 85-90% of their total mass, to suppress the process of steel corrosion. As a result, they made a statement of the anticorrosive effectiveness of the shell and traditional (100%) ferrites' parity and the undoubted economic feasibility of pigments with low content of expensive active principle practical use if only because of the fact that the core is the ferro-silicon industry waste.…”