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The methods of potentiodynamic polarization curves and quantitative Auger electron spectroscopy are used to determine the mechanism whereby a dense protective nanofilm (up to 20 nm thick) forms. The film consists of Ti 2 O, TiO, and Ti 2 O 3 lower titanium oxides and forms under the layer of TiO 2 (10 nm) and oxygen chemisorbed over an orthopedic prosthesis (90.2 at.% Ti-9.8 at.% Si alloy) during electrolysis in a 3% NaCl solution, as the main component of the tissue fluid (Hank's physiological solution).A great many people all over the world suffer from arthrosis, osteoporosis, cervical hip fracture, and other diseases of bones. Orthopedic prostheses help to prevent immobility and recover the function of the limbs, such as internal prostheses and hip joint, knee joint, and other substitutes. The first orthopedic prostheses were made primarily of titanium alloys; titanium was not combined with other metals to avoid an undesirable galvanic couple. Titanium turned to be the most suitable metal whose mechanical properties were closest to the bone tissue. In particular, its fatigue takes twice as long to occur as compared with steel. Moreover, titanium and some of its alloys have ideal biocompatibility: titanium does not react with body tissues while being organically overgrown with bone tissue [1,2].Later on, Ti-Ni, including titanium nickelide [3], and VT6, Ti-Si, and other alloys came into use along with titanium in musculoskeletal operations, but the mechanical properties of these alloys have been examined much greater than chemical ones. Of special interest is the interaction of alloys for hip joint prostheses with tissue fluid. The interaction of samples with Hank's solution, which mainly consists of a 3% NaCl solution, is commonly modeled in such studies.This paper studies the corrosion resistance of a new Ti-Si alloy, such as Ti-6% Si, which does not contain toxic elements (V and Al). Preliminary mechanical tests have shown that Ti-Si alloy meets most requirements for prosthesis materials. For example, their strength reaches 700 to 1100 MPa and plasticity is 9 to 20% depending on the composition and thermomechanical treatment [4].Titanium of grade VT1-0 (as per GOST 19807-91) and silicon of grade KR1 were the starting materials. The test samples were cut out from cast billets produced by the arc plasma process described in [4]. According to

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