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The electrochemical behaviour of the biomedical and metallic alloys,especially in the orthopaedic implants fields, raises many questions. Thisstudy is dedicated for studying the Ti-6Al-4V alloy, by electrochemicalimpedance spectroscopy, EIS, in various physiological media,: Ringer solution,phosphate buffered solution (PBS), PBS solution and albumin, PBS solution withcalf serum and PBS solution with calf serum and an antioxidant (sodium azide).Moreover, the desionised water was considered as the reference solution. Thetests reproducibility was investigated. The time-frequency-Module graphshighlighted that the desionised water is the most protective for the Ti-6Al-4Valloy. This biomedical alloy is the less protected in the solution constitutedby PBS and albumin. The time-frequency graph allows pointing out the graphicsignatures of adsorption for organic and inorganic species (differences betweenthe modules means in studied solution and the modules mean in the referencesolution). --- Le comportement \'electrochimique des alliages m\'etalliquesbiom\'edicaux, notamment dans le domaine des implants orthop\'ediques, poseencore de nombreuses questions. Ce travail propose d'\'etudier l'alliage detitane Ti-6Al-4V, par spectroscopie d'imp\'edance \'electrochimique, SIE, dansdiff\'erents milieux physiologiques : solution de Ringer, solution \`a based'un tampon phosphate (PBS), solution PBS avec de l'albumine, solution PBS avecdu s\'erum bovin et une solution PBS avec du s\'erum bovin et un antioxydant(azoture de sodium). De plus, une solution d'eau ultra-pure servira der\'ef\'erence. La reproductibilit\'e des tests a \'et\'e \'etudi\'ee. Lesrepr\'esentations temps-fr\'equence des modules ont mis en \'evidence que l'eaud\'esionis\'ee est la solution qui pr\'esente le caract\`ere le plus protecteurpour le Ti-6Al-4V. Cet alliage de titane est le moins prot\'eg\'e dans lasolution de PBS contenant de l'albumine. Cette repr\'esentation permet demettre en \'evidence des signatures graphiques d'adsorption des esp\`ecesinorganiques et organiques (diff\'erences entre les moyennes des modules dansles solutions \'etudi\'ees et la moyenne des modules dans la solution der\'ef\'erence).

matériaux and techniques/matériaux et techniques

Influence of proteins from physiological solutions on the  electrochemical behaviour of the Ti-6Al-4V alloy: reproducibility and  time-frequency dependence. ---- Influence de la teneur en prot\'eines de  solutions physiologiques sur le comportement \'electrochimique du Ti-6Al-4V :  reproductibilit\'e et repr\'esentation temps-fr\'equence