Self-stratifying coatings containing barrier and active anticorrosive pigments

Anti‐Corrosive Properties and Physical Resistance of Alkyd Resin–Based Coatings Containing Mg‐Zn‐Fe Spinels

“…The alkaline nature of the pigments induced changes in the pH of the pigmented films compared to the non-pigmented film. The pigments shifted the pH values upwards due to the neutralization of the acid components of the binder [5,51]. This effect was most pronounced for pigment C (lamellar Mg 0.2 Zn 0.8 Fe 2 O 4 ), where pH f was 7.9 ( Table 1).…”

“…The goal of research in this area is to develop non-toxic pigments possessing a high anti-corrosive efficiency with a view to replacing lead and chromium (VI)-based pigments that used to be applied in the past [2][3][4]. One direction in this area focuses on chemical or physical modification of known pigments, typically of the phosphate type [3,5]. New inorganic pigments or organic corrosion inhibitor are also developed [6].…”

Anticorrosive efficiency of alkyd resin-based coatings containing Mg–Zn–Fe mixed oxide-based pigments

“…A higher alkalinity -pH 10.0 -was found for pigment Pig C (lamellar Mg 0.2 Zn 0.8 Fe 2 O 4 ). This is presumably due to the presence of a residual amount of the unreacted magnesite (below the limit of detection by the X-ray method) because magnesium carbonate is very diffi cult to decompose [47]. Such pigments, possessing a high pH, can be expected to form alkaline soaps with the acid components of the alkyd resin (a fatty acid R-COOH in this case) and to enter other neutralization reactions with the acid components of the corrosive medium penetrating through the protective fi lm.…”

One pot flame retardant and weathering resistant coatings for plastics: a novel approach

“…Fluoropolymer resins in particular demonstrated promising results when combined with epoxy resins in terms of self-stratication on both plastic and metallic substrates. [5][6][7][8][9] Up to now, these coatings have been developed mainly for anticorrosion, self-healing and weather-resistant applications, 4,10,11 but they have never been considered for re retarding plastic substrates. The aim of this study is thus to develop re retardant (FR) epoxy-uoropolymer based self-stratifying coatings for PC which could overcome the weathering issues of traditional FR coatings.…”