From an examination of the AZT = = f(T) relationships for the oxidation reactions (Fig. la) it can be concluded that at temperatures up to 600~ oxide layers of complex chemical composition, viz., titanium oxides and oxides of the alloying components may be formed on the surface of titanium alloys. At the temperatures of hot-salt corrosion the nor~alaffinity of titanium and the alloying components for oxygen decreases to almost the same degree but remains fairly high. These calculations agree with the experimental data on the presence of oxide films at sites of corrosion failure. The oxidation of salts to form oxides and free chlorine is thermodynamically For the majority of salts their affinity for oxygen increases with an increase in temperature. In decreasing probability of oxidation salts can be placed in the orderz ZrCla, MoCI2, AICIs, CrCI2, TiCIa, FeCI,. When salts react with water vapor, reactions which are accompanied by the formation of the metal hydroxides or oxides and hydrogen chloride (Fig. ib)are themodynamically probable. The reactions with MoCI4 and AICIs have a high probability of taking place. In the case of the reaction between titanium chlorides and water vapor it can be expected that up to 400~ the pyrohydrolysis of TiCI4 is more probable, while above 400~ the pyrohydrolysis of TIC13 is more likely. Here the pyrohydrolysis of TiCI~ and TiCI3 is more probable thermodynamically than that of TiCI~. From a comparison of the results of a thermodynamic analysis of the type of reactions "salt + H20" and"salt + 02" it follows that at hot-salt corrosion temperatures oxidation reactions of the salts are more probable than their pyrohydrolysls, i.e., the presence of free chlorine in the corrosion products is more probable thermodynamically than that of hydrogen chloride. When chlorine reacts with the layer of oxides, a number of chlorides of the alloying components are formed on the surface of the alloy besides the titanium chlorides. It is characteristic than many impurity oxides are chlorinated appreciably more readily than the