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Artigo Científico | Geral Superfícies e Filmes Finos | Inglês | 10/07/2007
Autores: Evandro de Azevedo Alvarenga, Kleiner Marques Marra, V.T.L. Buono
Palavras-chave: acrylic resins, adhesives, degradation, epoxy resins, low carbon steels
Resumo: The aim of this work was to evaluate the adhesiveness of uncoated and zinc-electrogalvanized steel sheets used in the automotive industry. Three types of adhesives, one acrylic and two epoxy resins, were employed to join low carbon cold rolled steels, one uncoated and another electrogalvanized, both previously degreased or chemically pickled. Mechanical strength of the joints was evaluated by the T-peel and tensile strength tests. Steel grade, surface condition and heating below the cure temperatures did not influence the joints' mechanical strength. However, their shear strength decreased drastically as the test temperature increased. The exposure of the joints to an atmosphere with 90% relative humidity at 40 °C caused reduction of their shear strength. Epoxy adhesives showed higher mechanical strength, but exhibited higher degradation by humidity.
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