@Article{SilvaUedaSilvCoda:2007:CoBeTi,
               author = "Silva, Leide Lili Gon{\c{c}}alves da and Ueda, M{\'a}rio and 
                         Silva, M. M. and Codaro, E. N.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and Department of 
                         Mechanical Engineering, Technological Institute of Aeronautics 
                         (ITA) and {Faculdade de Engenharia de Guaratinguet{\'a}. 
                         Universidade Estadual Paulista (FEG.UNESP)}",
                title = "Corrosion behavior of Ti-6Al-4V alloy treated by plasma immersion 
                         ion implantation process",
              journal = "Surface and Coatings Technology",
                 year = "2007",
               volume = "201",
               number = "19/20",
                pages = "8136--8139",
                month = "Aug.",
             keywords = "Ti-6Al-4V alloy, plasma immersion ion implantation, corrosion, 
                         nitride layer, TITANIUM, RESISTANCE, FILMS, OXIDE.",
             abstract = "Ti-6Al-4V alloy is one of the most frequently used Ti alloys with 
                         diverse applications in aerospace and biomedical areas due to its 
                         favorable mechanical properties, corrosion resistance and 
                         biocompatibility. Meanwhile, its surface can stiffer intense 
                         corrosion caused by wear processes due to its poor tribological 
                         properties. Thus in the present study, PIII processing of 
                         Ti-6Al-4V alloy was carried out to evaluate its corrosion 
                         resistance in 3.5% NaCl solution. Two different sets of Ti-6Al-4V 
                         samples were PIII treated, varying the plasma gases and the 
                         treatment time. The corrosion behavior is correlated with the 
                         surface morphology, and the nitrogen content. SEM micrographs of 
                         the untreated sample reveal a typical two-phase structure. PIII 
                         processing promotes surface sputtering and the surface morphology 
                         is completely different for samples treated with N-2/H-2 mixture 
                         and N-2 only. The highest penetration of nitrogen (similar to 88 
                         nm), corresponding to 33% of N-2 was obtained for the sample 
                         treated with N-2/H-2 mixture for 1:30 h. The corrosion behavior of 
                         the samples was investigated by a potentiodynamic polarization 
                         method. A large passive region of the polarization curves (similar 
                         to 1.5 V), associated with the formation of a protective film, was 
                         observed for all samples. The passive current density (similar to 
                         3 x 10(-6) A cm(-2)) of the PIII-treated Ti-6Al-4V samples is 
                         about 10 times higher than for the untreated sample. This current 
                         value is still rather low and maintains good corrosion resistance. 
                         The anodic branches of the polarization curves for all treated 
                         Ti-6Al-4V samples demonstrate also that the oxide films break down 
                         at approximately 1.6 V, forming an active region. Although the 
                         sample treated by N-2/H-2 mixture for 1.30 It has thicker nitrogen 
                         enriched layer, better corrosion resistance is obtained for the 
                         PIII process performed with N, gas only.",
           copyholder = "SID/SCD",
                 issn = "0257-8972",
             language = "en",
           targetfile = "corrosion beharvior of ti 6al 4v alloy.pdf",
        urlaccessdate = "03 maio 2024"
}