MAYSA TERADA
13 resultados
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Artigo IPEN-doc 25752 Corrosion resistance of tartaric-sulfuric acid anodized AA2024-T3 sealed with Ce and protected with hybrid sol–gel coating2019 - TERADA, M.; QUEIROZ, F.M.; AGUIAR, D.B.S.; AYUSSO, V.H.; COSTENARO, H.; OLIVIER, M.G.; MELO, H.G. de; COSTA, I.2024 aluminum alloys are widely used in the aerospace industry due to properties as lightweight, high specific strength and durability. However, they are prone to localized corrosion due to its high amount of intermetallics. A promising method to protect the exposed metal surface is to use eco-friendly alternative corrosion inhibitors in combination with a barrier coating system. In this study, a treatment in an aqueous solution with the addition of cerium ions has been proposed and its effects on the corrosion resistance of the AA2024-T3 alloy were investigated. Samples were anodized, hydrothermally treated in aqueous solutions, containing or not cerium ions at the boiling temperature and then coated with sol-gel. The effect of Ce ions in the characteristics of the surface film formed, such as morphology and corrosion resistance, was investigated by scanning electron microscopy and electrochemical impedance spectroscopy (EIS). The EIS results showed that the addition of Ce(III) ions improved the corrosion resistance of the AA 2024-T3 TSA anodized and hydrothermally treated.Artigo IPEN-doc 23520 Correlation between microstructure and corrosion behavior of two Al–Fe–Si alloys2016 - YOSHIKAWA, D.S.; TERADA, M.; ASSIS, S.L.; COSTA, I.; PADILHA, A.F.In this work, the corrosion behavior of the AA4006 alloy made by the twin roll caster process was evaluated using electrochemical impedance spectroscopy (EIS), anodic potentiodynamic polarization curves, and scanning electron microscopy (SEM). This alloy belongs to the Al–Fe–Si system and is present with higher amounts of Fe and Si than AA1050 aluminum. Electrochemical tests were performed in a sulfate solution with or without chloride ions, and two different areas of the AA4006 alloy were tested: at the surface and at the center of the sheet (half thickness). The results obtained were compared to the commercially pure AA1050 aluminum. Electrochemical tests carried out using the solution without chloride ions presented similar results; however, the addition of chloride ions resulted in localized corrosion in all samples. It was possible to compare the corrosion behavior of the studied materials analyzing these electrochemical data and the micrographs obtained by scanning electron microscopy.Resumo IPEN-doc 22243 Resistência à corrosão do aço inoxidável LEAN duplex UNS 32304 soldado pelo processo FSW2015 - AYUSSO, VICTOR H.; TERADA, MAYSA; COSTA, ISOLDAArtigo IPEN-doc 20495 Estudo da resistência à corrosão do aço inoxidável lean duplex UNS 32304 soldado por atrito com pino não consumível2014 - AYUSSO, VICTOR H.; TERADA, MAYSA; PEREIRA, VICTOR F.; TOMACHUK, CELIA R.; ROSSI, JESUALDO L.; RAMIREZ, ANTONIO J.; COSTA, ISOLDAArtigo IPEN-doc 12571 A comparison of the corrosion resistance of DIN W.NR. 1.4460 high nitrogen and F-138 stainless steels for biomedical applications2006 - TERADA, M.; ANTUNES, R.A.; PADILHA, A.F.; COSTA, I.Artigo IPEN-doc 11066 The corrosion behaviour of TiN-coated powder injection molded AISI 316L steel2005 - ANTUNES, R.A.; WIGGERS, W.S.; TERADA, M.; VENDHAUSEN, P.A.P.; COSTA, I.Artigo IPEN-doc 13288 Caracterizacao eletroquimica da liga de aluminio AA 2024-T3 com filme de moleculas auto organizaveis2008 - BANCZEK, E.P.; TERADA, M.; ASSIS, S.L.; COSTA, I.Artigo IPEN-doc 13279 A comparative study of the corrosion resistance of incoloy Ma 956 and PM 2000 superalloys2008 - TERADA, MAYSA; MARQUES, ROGERIO A.; MAGNANI, MARINA; PADILHA, ANGELO F.; COSTA, ISOLDAArtigo IPEN-doc 14872 Use of SECM to study the electrochemical behaviour of DIN 1.4575 superferritic stainless steel aged at 475 sup(o)C2009 - TERADA, M.; PADILHA, A.F.; SIMOES, A.M.P.; MELO, H.G. de; COSTA, I.Artigo IPEN-doc 13024 Investigation on the intergranular corrosion resistance of the AISI 316L(N) stainless steel after long time creep testing at 600 sup(o)C2008 - TERADA, M.; ESCRIBA, D.M.; COSTA, I.; MATERNA MORRIS, E.; PADILHA, A.F.