IMPROVEMENT OF ANTICORROSIVE PERFORMANCE OF PHOSPHATE BASED ALKYD PAINTS WITH SUITABLE ADDITIVES

G. BLUSTEIN; M. C. DEYA; R. ROMAGNOLI; A.R. DI SARLI; B. DEL AMO

JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH

SPRINGER

Lugar: New York; Año: 2011 vol. 8 p. 171 - 181

1547-0091

The purpose of this investigation is pointed out to reduce the content of zinc phosphate inalkyd-based paints by means of the incorporation of low quantities of selected solublecorrosion inhibitors. The paper describes the anticorrosive behaviour of alkyd paintscontaining reduced levels of zinc phosphate, zinc oxide and some soluble compounds used asadditives (e.g. sodium polyphosphate, sodium phosphate and sodium benzoate).Anticorrosive solvent-borne alkyd paints were formulated with a zinc phosphate content of10% by volume with respect to the total pigment concentration. In all cases, the PVC/CPVC(pigment volume concentration/critical pigment volume concentration) ratio was 0.8.Experimental paints applied on SAE 1010 panels were evaluated by accelerated tests (saltspray cabinet) and electrochemical measurements (electrochemical impedance spectroscopy).The results show that the additions of a little concentration of soluble corrosion inhibitors tolow content zinc phosphate paint formulations enhance the performance of them in a veryremarkable way. Perhaps, the most outstanding feature is that the employment of solubleadditives allowed to reduce the zinc phosphate content with concomitant cost saving.