ResumoNeste trabalho foi avaliada a resistência à corrosão do aço inoxidável AISI 204 revestido com filme hidrofóbico de silano. Quatro sistemas foram analisados combinando o tempo de hidrólise do silano na solução sol-gel e a rugosidade do substrato. Estes parâmetros foram definidos como: 24 horas de hidrólise e substrato rugoso (24HJ), 2 horas de hidrólise e substrato rugoso (2HJ), 2 e 24 horas de hidrólise com o substrato liso (2HN e 24HN). As amostras foram caracterizadas por diferentes técnicas: (a) microscopia eletrônica de varredura (MEV) foi usada para verificar a morfologia dos substratos; (b) medidas de ângulo de contato para verificar a eficiência do filme hidrofóbico desenvolvido neste estudo; (c) ensaios de névoa salina e espectroscopia de impedância eletroquímica (EIE) foram realizados para avaliar a resistência à corrosão. A amostra 24HJ que apresentou o maior ângulo de contato (130°) mostrou maior resistência à corrosão em comparação com as outras amostras. A metodologia usada para a obtenção do filme hidrofóbico mostrou-se eficiente para a proteção do metal base contra a corrosão. Palavras-chave: Revestimento hidrofóbico; Ângulo de contato; Resistência à corrosão; Modificação superficial; Silano. INFLUENCE OF MORPHOLOGICAL ALTERATION ON CORROSION RESISTANCE OF STAINLESS STEEL AISI 204 WITH HYDROPHOBIC COATINGS AbstractThis work studied the corrosion resistance of stainless steel AISI 204 coated by hydrofobic silane film. Four systems were evaluated matching silane hydrolysis time in sol-gel solution and the roughness of the substrate. These parameters were defined as: 24 hours of hydrolysis time and roughness substrate (24HJ), 2 hours hydrolysis time and roughness substrate (2HJ), 2 and 24 hours hydrolysis time with smooth substrates (2HN and 24HN). The following characterizations was applied: (a) scanning electron microscope (SEM) was used to check the substrates morphology; (b) the contact angle measurements (CA) tested the efficiency of hydrophobic film developed in this study; (c) the salt spray tests and electrochemical impedance spectroscopy (EIS) were performed for evaluating the corrosion resistance. The 24HJ presented higher water contact angle (130°) and it demonstrated greater corrosion resistance in comparison with the other samples. The methodology used to obtain the hydrophobic film presented efficient for the base metal corrosion protection. Keywords: Hydrophobic coatings; Water contact angle; Corrosion resistance; Surface modification; Silane. INTRODUÇÃOUm revestimento hidrofóbico é caracterizado por repelir a água quando em interação com algum material sólido. Para um revestimento ser considerado hidrofóbico é necessário que o ângulo de contato formado entre a superfície revestida e uma gota de água seja maior ou igual a 90°, enquanto que uma superfície superhidrofóbica apresenta um ângulo de contato (CA) maior ou igual a 150°. Superfícies hidrofóbicas tem despertado a atenção de muitas pesquisas acadêmicas e também tecnológicas devido a algumas propriedades que estes revestimen...
A superhydrophobic surface with excellent corrosion resistance was prepared on sandblasted AISI 304 stainless steel by applying stearic acid through dip-coating. Superhydrophobic surfaces have several advantages, such as self-cleaning, anti-icing, anti-adherent, and anti-corrosion. In this work, roughness and superhydrophobic properties were studied by contact angle, optical profilometry, electrochemical impedance spectroscopy, and potentiostatic polarization techniques. The lowest surface wettability was obtained in sandblasted samples (146.2°, due to the roughness change). The stearic acid coating response on sandblasted substrates was acquired by EIS analysis. The sample set with higher corrosion resistance at saline solution during the polarized potentiostat tests was the smoothly coated sandblasted samples. For comparison, corrosion current density of sample without coating was 3.13x10 -7 , whilst the coated sample was 1.34x10 -8 . Further, the passive current density was 6.02x10 -7 for as-received samples and 2.16x10 -8 for coated samples. The modified surface proved to be effective against corrosion when compared to smooth surfaces.
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