Anales CIDEPINT 1997-98
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Examinando Anales CIDEPINT 1997-98 por Autor "Culcasi, José Daniel"
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Acceso Abierto Factores que afectan la estructura de recubrimientos de cinc obtenidos por inmersión(1998) Seré, Pablo Ricardo; Culcasi, José Daniel; Elsner, Cecilia Inés; Di Sarli, Alejandro RamónCoating solidification during hot-dip galvanizing is very complex due to Al-Fe, Al-Fe- Zn and Fe-Zn intermetallic compounds development. Fe-Zn ones are brittle and detrimental for mechanical properties, while the diffusion towards the surface of a segregated insoluble alloying such as antimonium causes the sheet darkness. Steel sheets of different roughness were hot-dip galvanized under different operation conditions using a laboratory scale simulator. The effect of steel roughness and process parameters upon coating characteristics were analysed Experimental results showed that the steel roughness affects the coating thickness, zinc grain size and texture as well as the out-bursts development, while the process parameters effects the Fe2Al5 morphology and anümonium segregation. - Artículo
Acceso Abierto SEM study of intermetallic phases growth in a hot-dip galvanizing process(1998) Seré, Pablo Ricardo; Culcasi, José Daniel; Elsner, Cecilia Inés; Di Sarli, Alejandro RamónThe influence of both the cooling rate and the base Steel roughness upon the Al-rich phase was análized For this, Steel sheets were coated in a simulator of the hot-dip galvanized process working at 470 ºC up to reaching an average roughness valué of 1.30 or 0.90 pan; besides, either an air or water spray flow was used in order to obtain cooling rotes between 7 and 22 ºC s-1, respectively. The galvanized píate surfaces were characterized by means of SEM and XRD analysis. From the experimental results the following conclusions could be drawn: a) the Al-rich phase growths as an intermetallic (AlsFez), that crystallizes forming an orthorombic lattice in which increasing cooling rotes do not change the morphology but stop the growing of the crystals, and b) an increase of the Steel roughness makes that outburst structures but not the Al-rich phase develops at the bottom of pits.