One coat system for metallic protection against corrosion and fire spreading

PEREYRA, A. M.; GIUDICE, C. A.; BENITEZ, J. C.

Pitture e Vernici European Coatings

GiBiPi Editrice S.R.L. (www.pittureevernici.it)

Lugar: Milán, Italia; Año: 2007 vol. 83 p. 54 - 63

Flame retardant coatings with anticorrosive properties were formulated for protecting metallic structures of buildings. Experimental coatings were based on a chlorinated alkyd resin prepared at laboratory and on several pigments such as rutile titanium dioxide for improving hiding power, micaceous iron oxide for controlling film permeability, zinc hydroxyphosphite for corrosion prevention and finally antimony trioxide,  zinc borate or alumina trihydrate alone or else a mixture among them for acting as fire retardant. SAE 1010 steel plates, sandblasted to ASa 2 ½ (SIS 05 59 00/1967) for reaching approximately 30 mm of maximum roughness (Rm), were employed. The formulated and prepared coatings were applied by brush attaining 100-110 mm dry film thickness. Then, their inhibiting behavior was assessed in Salt Spray (Fog) Chamber and in 100 % Relative Humidity Cabinet while the fire retardant capacity was established by determining the limiting oxygen index (LOI) and flame-spreading value (Two Foot Tunnel). Key words: coating, rusting, blistering, limiting oxygen index, flame-spreading value.