Testing of corrosive-inhibitive properties of zinc orthophosphate doped with lanthanum orthophosphate

Abstract

This paper deals with the study of corrosion-inhibition properties of commercially used pigment Zn3(PO4)2 after the modification with lanthanum orthophosphate in various molar ratios. The system Zn3(PO4)2/LaPO4 was prepared in one step synthesis by crystallization method. Individual pigments were examined in the synthetic-based paint and water-based paint. The samples were exposed to influences in the condensation chamber, atmosphere of 100 % humidity and to the content of 0.2 a 1 dm3 SO2. The prepared pigments were evaluated from the viewpoint of the degree of rusting, the blistering, degree of cracking, corrosion in the surroundings of cut and corrosion in the surface. The evaluation, which took place in the comparison with commercially available samples and laboratory prepared Zn3(PO4)2, show very good efficiency for the protection of metallic materials.