Anticorrosion properties of SrO¯ZnO¯B2O3¯P2O5 pigments

Seven compositions of anticorrosion pigments of zinc¯strontium borophosphates were prepared and then characterized by X-ray diffraction analysis, solubility measurements, particle size distribution, and the pH of their aqueous extracts. The pigments were dispersed in an alkyd resin formulation, and used in paints. Following application of the paints to steel sheets, they were subjected to standard anticorrosion tests, to assess their anticorrosive¯inhibitory properties. Test results showed that 14.6SrO¯43.7ZnO¯8.3B2O3¯33.3P2O5 and 37.5SrO¯37.5ZnO¯25B2O3 compositions surpassed the anticorrosive properties of standard pigments based on zinc orthophosphate and calcium metaborate.