Tierras raras como pigmentos anticorrosivos para la elaboración de pinturas inteligentes

S. N. ROSELLI; M.C. DEYÁ; R. ROMAGNOLI

La Plata. Provincia de Buenos Aires

Congreso; 7º Congreso de Medio Ambiente; 2012

AUGM

Zinc phosphate has been used as corrosion inhibiting pigment in anticorrosive paints but its use is seeking to limit due to environmental issues. The aim of this paper is to study the efficiency of ion-exchanged natural zeolites hexavalent chromium-free and low zinc phosphate (PZ) passivating ions. The natural zeolites were exchanged with cerium ions (ZCe) and lanthanum (ZLa). Analytical, spectroscopic and electroanalytical techniques were used to study the efficiency of these compounds in protecting metallic substrates from SAE 1010 steel. The electrochemical test results show a superior performance of ZCe compared to ZLa. Furthermore, the pigment mixture PZ - ZCe presented a slightly superior performance to that of PZ. Although it does not introduce significant improvements compared to PZ, would reduce the content of PZ in a corrosion resistant paint. There is a synergism between PZ and ZCe which slightly improves the protective behavior of the pigments separately. The pigment mixture PZ – ZCe is to be used in the development of an anti-corrosive paint at a later stage.