Anales CIDEPINT 1997-98

URI https://digital.cic.gba.gob.ar/handle/11746/10181

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  • Contribucion a revista
    Acceso Abierto
    Publicaciones científicas y técnicas realizadas por el CIDEPINT (Período 1993-1998)
    (1998) Centro de Investigación y Desarrollo en Tecnología de Pinturas
    Incluye listados de: - Publicaciones en revistas internacionales de la especialidad - Publicaciones en proceedings de congresos y reuniones científicas - Publicaciones en revistas nacionales y en CIDEPINT-Anales
  • Artículo
    Acceso Abierto
    Steel corrosión protection by means of alkyd paints pigmented with calcium acid phosphate
    (1998) del Amo, Beatriz; Romagnoli, Roberto; Vetere, Vicente
    The use of classic anticorrosive pigments is beirtg more and more restricted by increasing environmental concems; they are gradually replaced by zinc phosphate and related compounds. Other anticorrosive pigments such as surface exchanged silicas were also proposed The object of this research is to study the anticorrosive properties of calcium acid phosphate as inhibitive pigment introducing a careful selection of complementary pigments in order to achieve an efficient anticorrosive protection. Several paints were prepared and tested through accelerated and electrochemical tests. The nature of the passive film was also studied. Paints containing zinc oxide and calcium carbonate (50/50) showed the best performance and a higher resistance in the salí spray test. Zinc oxide and calcium carbonate decreased film permeability and improved Steel passivation The passive film was composed by a ferric oxyhydroxide film whose pores became plugged by ferric phosphate.
  • Artículo
    Acceso Abierto
    High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
    (1998) Romagnoli, Roberto; del Amo, Beatriz; Vetere, Vicente; Véleva, L.
    Zinc molybdenum phosphate belongs to the so called second generation phosphate pigments and is claimed to have equal or greater anticorrosive properties than chromates and better than zinc phosphate alone. Little Information is available in the literature about its anticorrosive performance. The aim of this research was to stucfy the anticorrosive performance of zinc molybdenum phosphate in solvent borne epoxy paints employing two anticorrosive pigment loadings. The effect of incorporating zinc oxide as complemetary pigment was also studied SAE 1010 Steel ponéis were primed and coated with three different paint systems containing the anticorrosive paint and this paint plus a sealer cmd/or a topcoat. The anticorrosive efftciency of the different paint systems was assessed by accelerated tests (salí spray, humidity and accelerated weathering). Electrochemical measurements were done employing the anticorrosive paints alone. Results showed that the highest anticorrosive effect was obtained employing 30% of zinc molybdenum phosphate. Polarization measurements showed that the anoche film formed on Steel blocked the active sites for oxygen reduction. The incorporation of zinc oxide to pigment formula was detrimental due to its high water absorption and to the fact that it reduced zinc molybdenum phosphate solubility by the common ion effect. Polarization curves of pigments mixtures could be used as a guideline to precüct the anticorrosive coating performance in accelerated and electrochemical tests. However, the final decisión on pigment selection musí be taken on the basis of accelerated triáis.
  • Artículo
    Acceso Abierto
    Studies on biofouling at Mar del Plata harbor: monthly settlement of calcareous species along a year
    (1998) Pérez, M. C.; García, M. T.; Stupak, Mirta E.
    Monthly settlement of calcareous species was followed in Mar del Plata harbor (Argentina) along a year. Large number of calcareous organisms recruited onto ceramic ponéis. Balanus amphitrite and Hydroides elegans were the most representative species settled on the primary space. Other bamacles, B. glándula + B improvisus followed in importance, but the number of recruits per panel was always low. All of them were measured and total occupied oreas estimated The species showéd different settlement cycles, different preferences by both depth levels and surface texture. The máximum peak of density for B. glándula + B improvisus was in December, for B amphitrite in February and for Hydroides elegans in March. Virtually no settlement took place during colder months (June-September). Bamacles preferred to settle on the back side of the panels, with grooves and pits, while serpulids showed no texture preferences. In relation with depth all species preferred to colonize the three deepest levels. Data corresponding to growth rotes indicated a rapid development during warmer months.
  • Artículo
    Acceso Abierto
    Comunidades incrustantes de áreas costeras naturales del sur de la Provincia de Buenos Aires (Argentina)
    (1998) Bastida, Ricardo; Martin, J. P.; Ieno. E.
    This work deais with the study of marine fouling communities of two Coastal localities of Buenos Aires Province. Sampling programme was carried out using artificial sampling substrates which were placed vertically on the intertidal and subtidal zone of Reta and Monte Hermoso shores. Both localities showed the dominance of the small mussel Brachidontes rodriguezi. Density of this species decreases towards the subtidal levels, while associated fauna density fluctuates with increasing depth. The studied localities show dijferences in some of their specific components and differ notably from fouling communities described for harbour oreas of the Buenos Aires Province. Associations between fouling samples are based on specific components and enviromental factors related with tidal levels.