Abstract
Concerns about ozone layer, contamination, fossils resources and health, has banned or restricted the use of traditionally organic solvents in paints. As a consequence, new resins that employed water as main solvent are being studied. Among these resins, alkyds are the most studied one as they can also be synthesised from natural vegetable sources, making them more acceptable.The aim of this paper was to study the anticorrosive behaviour of alkyd / polysaccharide paints containing zinc phosphate or zinc aluminum phosphate as main pigment and their performance against fungal growth. Two different PVC (pigment volume concentration) were studied. Painted panels were studied by exposition to salt spray and humidity chambers, where rusting and blistering degrees were evaluated, and by electrochemical tests (corrosion potential measurements, ionic resistances determination, linear polarization curves and polarization resistances determination).Results showed that these type of paints can be used to protect steel and that the type of pigment and the PVC are important to the protection. Besides, good selection of both also prevents fungi growth in a high humid environment.
Highlights
Paints are one of the most useful methods to protect metals from corrosion [1,2,3,4]
Alkyd resins are world-wide used as film forming material due to their ease of application and the good protection they provide to metals exposed to mildly aggressive environments [1,5,6]
As alkyd resins are polyesters prepared by the condensation of polyols, polybasic acids, fatty acids or triglyceride oils [7], natural sources can be used as raw materials [8,9]
Summary
Paints are one of the most useful methods to protect metals from corrosion [1,2,3,4] They main compounds are resin (film forming mate rial), pigments (anticorrosive pigment, prime, fillers) and solvents [5]. Alkyd resins use white spirit as solvent and, due to the concerns about the ozone layer, contamination, fossils resources and health, organic solvents traditionally used are being banned or restricted. These regulations enhanced the research and development of new water soluble resins (resins that are soluble in water) or water-reducible resins (resins having hydrophilic groups in most or all molecules) [7,10,11]. Modifications of resins to incorporate water as solvent can be done in the manufacturing stage by selecting water-compatible raw materials [12,13] or incorporating additives such as polysaccharides [14] and silanes [15] during paint preparation
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