A study of the effects of pigments and fillers on the properties of anticorrosive paints

Abstract

Purpose -To investigate the properties of coatings containing various types of fillers from the point of view of their physical-mechanical properties and anticorrosive properties. Design/methodology/approach -Research used fillers of different types varying in morphology and/or chemical composition; these were then compared with selected pigments and zinc phosphate, an anticorrosive pigment. The following parameters were observed for all of the fillers and pigments: oil absorption, CPVC value, density, extract pH, specific surface, particle size, and water-soluble substances. The morphology of particles was observed by means of an electron-scanning microscope. The coatings of these fillers and pigments were formulated on an epoxy resin binder basis cured with a polyamine hardener. The coatings prepared were subjected to the measurement of physical-mechanical properties such as hardness and deepening resistance, flex resistance, adhesion to steel, and the gloss of the coatings. The coatings containing the fillers and pigments studied underwent corrosion tests in a condenser chamber and in a salt-spray cabinet. Findings -The results obtained through the tests allowed the selection of the optimum filler for an epoxy coating with barrier anticorrosive properties. As per respective findings, some fillers in these coatings of significant thickness can be comparable to their zinc phosphate counterparts.Research limitations/implications -The anticorrosive properties of the coatings studied can also be tested in paints by means of atmospheric exposure, for instance, with the aid of a Florida test. Practical implications -The findings are helpful towards applications in the formulations of anticorrosive coatings of significant thickness that offer an effective barrier mechanism. Originality/value -The research presents the results of the properties of a whole range of industrially employed fillers and pigments contained in paints. Based on this study, the formulation of steel protecting coatings can be optimised.

Anticorrosive coatings: a review

“…265,283 SPINEL PIGMENTS: Another group of inhibitive pigments are spinel-type pigments based on mixed metal oxides. 284 Spinel-type pigments are substances of a crystalline character whose properties depend on the characteristics of the lattice. The first generation of spinel-type pigments consisted of a ferrite type of combination of two cations in the lattice structure (ZnFe 2 O 4 , CaFe 2 O 4 ).…”

Anticorrosion efficiency of zinc-filled epoxy coatings containing conducting polymers and pigments

“…degree of corrosion of the substrate metal, degree of coating film area blistering, degree of coating film blistering near the cut, and degree of substrate metal corrosion near the cut, are assigned scores on the 0 (poorest anticorrosion protection) to 100 (highest anticorrosion protection) scale [35]. Now it is sufficient to calculate the arithmetic mean of the four scores to obtain a single value describing the efficiency of protection, referred to as the coating material's overall anticorrosion efficiency E (Eq.…”

Study of corrosion inhibition properties of metal oxide based core shell pigments in organic coatings

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