Coatings for the simultaneous protection against steel corrosion and fire spreading

PEREYRA, ANDREA M.; CANOSA, GUADALUPE; GIUDICE, CARLOS A.

Buenos Aires

Congreso; 9° Congreso Internacional de Metalurgia y Materiales SAM-CONAMET 2009: Primeras Jornadas Internacionales de Materiales Nuclares; 2009

SAM-CONAMET-CONEA

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 trihydrated alumina alone or else a mixture among them for acting as fire retardant. The 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 flamespreading value (Two Foot Tunnel). The results show that micaceous iron oxide acts as an effective barrier since the film permeability allows the requirements of rusting and blistering resistance to be made compatible, that antimony trioxide has a synergistic action of in presence of chlorinated resins, that of zinc borate and trihydrated alumina have an endothermic performance and finally that the highest PVC (inferior to the correspondent CPVC) lead to a satisfactory efficiency due to the highest content of inorganic components in the coatings. The results show that micaceous iron oxide acts as an effective barrier since the film permeability allows the requirements of rusting and blistering resistance to be made compatible, that antimony trioxide has a synergistic action of in presence of chlorinated resins, that of zinc borate and trihydrated alumina have an endothermic performance and finally that the highest PVC (inferior to the correspondent CPVC) lead to a satisfactory efficiency due to the highest content of inorganic components in the coatings.