CARACTERIZAÇÃO ESTRUTURAL DE JUNTAS DE LIGA AL6060-T5 SOLDADAS POR PONTOS DE FRICÇÃO SOB ATAQUE DA CORROSÃO
DOI:
https://doi.org/10.18066/revistaunivap.v31i71.4567Palavras-chave:
Liga de Alumínio Al6060-T5, resistência à corrosão, soldagem por fricção, FSSW, corrosão por imersãoResumo
As ligas Al6060-T5 são amplamente utilizadas na indústria aeroespacial, naval e automobilista. Contudo, a soldagem convencional pode enfraquecer sua resistência a corrosão. Assim, a soldagem Friction Stir Spot Welding (FSSW) se torna uma alternativa para reduzir a zona termicamente afetada (ZTA) na junta. Neste horizonte, este artigo avaliou soldas de chapas de Al6060-T5 em períodos de 336, 672 e 1008 horas de imersão em NaCl 3,5%. Para cada período, as chapas foram avaliadas quanto ao potencial de circuito fechado (PCA), dureza Vickers, composição elementar e severidade corrosiva. Os resultados mostraram um aumento percentual de Oxigênio (3 a 4%); identificando atividade corrosiva na zona de mistura. Da mesma forma, os ensaios eletroquímicos demonstraram uma maior suscetibilidade a corrosão em regiões próximas do centro da solda, em função da presença precipitados de Mg e de Si. Mesmo assim, com severidade corrosiva branda
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