Análise da resistência à corrosão do AISI 316L eletropolido e anodizado
Corrosion resistance analysis of electropolished and anodized AISI 316L
Raí Inácio Riffel; Sandra Raquel Kunst; Carlos Henrique Amaro da Silva; Vanessa Moura; Cláudia Trindade Oliveira
Resumo
O aço inoxidável 316L apresenta resistência mecânica e de corrosão o que o torna atrativo para uso em aplicações industriais. Nesse contexto, tratamentos superficiais como o eletropolimento e a anodização podem aprimorar ainda mais suas propriedades. Este estudo tem como objetivo comparar a resistência à corrosão do aço inoxidável AISI 316L submetido ao eletropolimento e à anodização, com foco na melhoria do desempenho superficial. O eletropolimento foi realizado em solução de 40% v/v H2SO4 a 60 °C, com aplicação de potencial entre 8 a 10 V. Já a anodização foi conduzida em solução de 10 M NaOH, em modo galvanostático, com densidade de corrente de 0,6 mA·cm−2, a 70 °C e sob agitação constante por 5 minutos. As amostras foram analisadas quanto à morfologia, ângulo de contato e polarização potenciodinâmica. Os resultados indicaram que o eletropolimento produziu uma superfície mais homogênea e livre de defeitos, conferindo ao aço inoxidável AISI 316L maior hidrofobicidade e melhor desempenho anticorrosivo em comparação às amostras sem tratamento e anodizadas.
Palavras-chave
Abstract
AISI 316L stainless steel exhibits mechanical strength and corrosion resistance, making it attractive for industrial applications. In this context, surface treatments such as electropolishing and anodization can further enhance its properties. This study aims to compare the corrosion resistance of AISI 316L stainless steel subjected to electropolishing and anodization, focusing on improving surface performance. Electropolishing was carried out in a 40% v/v H2SO4 solution at 60 °C, with an applied potential between 8 and 10 V. Anodization was conducted in a 10 M NaOH solution in galvanostatic mode, with a current density of 0.6 mA·cm−2 at 70 °C under constant stirring for 5 minutes. The samples were analyzed for morphology, contact angle, and potentiodynamic polarization. The results indicated that electropolishing produced a more homogeneous and defect-free surface, giving AISI 316L stainless steel greater hydrophobicity and better anti-corrosion performance compared to untreated and anodized samples.
Keywords
References
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Submitted date:
07/21/2025
Accepted date:
03/31/2026
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