NANO-STRUCTURED PROTECTIVE COATING SYSTEMS, WITH FIREPROOF PROPERTIES AND ENVIRONMENTALLY FRIENDLY, SUITABLE FOR THE PROTECTION OF METALLIC SUBSTRATES

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

Industrial & Engineering Chemistry Research

American Chemical Society

Año: 2009

0888-5885

The aim of this study was to formulate, develop and determine the behavior of nanostructured protective coating systems, with fireproof properties and environmentally friendly, suitable for the protection of metallic substrates. The results allowed concluding that the di- and tri-pigmented formulations based on laminar zinc, either alone or mixed with nano-zinc, showed an excellent corrosion resistance when a nano-structured self-cured inorganic silicate (high silica/alkali ratio) was selected as film forming material. Coating systems included a sealer of low permeability, which was based on the same film forming material that primers and on laminar pigments. Intumescent coatings were manufactured and then applied on the sealer; in this study, two types of products in aqueous single package were formulated. Anticorrosive capacity was evaluated in Salt Spraying (Fog) Chamber and in 100% Relative Humidity Cabinet while the performance against the fire action was determined by estimating the Limiting Oxygen Index in the LOI Cabinet, the Flame Advance in a Inclined Tunnel and finally the Thermal Conductivity in UL 94 Flame Chamber; in the last test, the Degree of Intumescence was also assessed. The results showed an excellent ability for corrosion controlling and in addition a good performance against to the fire action of some of the no pollutant coating systems designed.   Keywords: Nanostructured coatings, anticorrosive capacity, sealer, flame-retardant, laboratory tests.