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Authors
Abstract(s)
As cablagens metálicas são aplicadas abundantemente na montagem dos automóveis,
para accionamento de diversos dispositivos, tais como a abertura de portas, abertura da
mala ou da tampa do motor, abertura do tampão do depósito de combustível,
accionamento do travão de mão, etc.
Nas cablagens metálicas utilizadas na indústria automóvel é comummente utilizado
arame entrançado de aço zincado, o qual foi já estudado resistir à agressividade das
condições em que habitualmente trabalham. No entanto, para que esta estabilidade de
funcionamento exista, torna-se necessário que a qualidade do arame entrançado seja a
mais adequada.
O presente trabalho surgiu da necessidade de averiguar quais as razões que estariam por
detrás do aparecimento de quantidades relativamente abundantes de Óxido de Zinco
(ZnO) em cablagens metálicas utilizadas na indústria automóvel, poucas semanas depois
do seu fabrico.
O estudo foi levado a cabo com vista a satisfazer as necessidades de investigação deste
problema por parte de uma empresa de cablagens metálicas instalada no nosso país, a
FicoCables, estabelecendo quais as causas-raiz deste problema, com vista a poder evitálo
no futuro.
O trabalho foi concluído com sucesso, tendo-se averiguado que existiam lacunas graves
de limpeza do cabo entre as operações de conformação do arame e de zincagem, com
deposição de elementos potenciadores do Óxido de Zinco na interface, os quais viriam a
revelar-se cruciais à posteriori, para a nucleação e desenvolvimento do Óxido de Zinco na
superfície do cabo.
The metal cables are applied abundantly in the automotive assembly lines leading to drive various devices, such as opening doors, opening trunk or engine cover, open the fuel tank cap, triggering the handbrake, etc. The wire used in automotive metallic harness is commonly braided wire galvanized steel, which has been studied to resist to the aggressions typically imposed by the conditions under which usually work. However, for this operating stability exists, it is necessary that the quality of the braided wire is the appropriate. This work arose from the need to find out what are the reasons that were behind the appearance of relatively abundant quantities of zinc oxide (ZnO) in metallic cables used in the automotive industry, a few weeks after their manufacture. The study was carried out to meet the research needs of the FicoCables, a company of metallic harness installed in our country, handling with that problem, establishing what are the root-causes of the problems, in order to be able to avoid it in the future. The work was completed successfully, and it was found that there were serious shortcomings of cable cleaning between the wire forming operations and galvanizing, with deposition of Zinc oxide enhancers elements in the interface, which would prove crucial to nucleation and development of zinc oxide on the surface.
The metal cables are applied abundantly in the automotive assembly lines leading to drive various devices, such as opening doors, opening trunk or engine cover, open the fuel tank cap, triggering the handbrake, etc. The wire used in automotive metallic harness is commonly braided wire galvanized steel, which has been studied to resist to the aggressions typically imposed by the conditions under which usually work. However, for this operating stability exists, it is necessary that the quality of the braided wire is the appropriate. This work arose from the need to find out what are the reasons that were behind the appearance of relatively abundant quantities of zinc oxide (ZnO) in metallic cables used in the automotive industry, a few weeks after their manufacture. The study was carried out to meet the research needs of the FicoCables, a company of metallic harness installed in our country, handling with that problem, establishing what are the root-causes of the problems, in order to be able to avoid it in the future. The work was completed successfully, and it was found that there were serious shortcomings of cable cleaning between the wire forming operations and galvanizing, with deposition of Zinc oxide enhancers elements in the interface, which would prove crucial to nucleation and development of zinc oxide on the surface.
Description
Keywords
Corrosão Oxidação Óxido de Zinco Arame de aço zincado Cablagens para automóveis Corrosion Oxidation Zinc Oxide Zinc electroplated steel wire Automotive harness