The work on examination of influence of composition of coats on corrosion process, in the modelling environment has been spent. On an substrate from steel St. 3 overcoated various coats: titan, nickel, titan-nickel, nickel-titan, alloy ТНМ-20. Besides, coats of the titan on nickel, nickel on the titan and titanium on the titan, and also behaviour of pure metals are studied. Have been gained the potentiodynamic polarization curves, dependences of stationary potential of the deenergised electrode from a time of trials, and also phase and chemical compositions of the superimposed coats, a surface roughness have been studied. During carried out works the behaviour of a steel St. 3 and pure metals (titanium, nickel, molybdenum) in a number of sour, alkaline and neutral solutions also has been researched. It is shown, that the most resistant is the pure titan thanks to formation on its surface of a passive film. The coat from the nickel, superimposed on a titanium underlayer, thanks to formation of intermetallic compound Ti2Ni is second on durability. Almost do not possess durability the coatings from nickel-titan and titan-nickel, superimposed on an underlayer from steel St. 3. The stationary potential of the pure titan the most positive and is refined with time almost on 230 mV. The most negative values of potential are watched at steel (-386 mV at the moment of plunging). With time, it becomes even more negative, attaining after 200 minutes of trials of value -484 mV. Values of potentials of the coats superimposed on steel, slightly more positive, but with time sharply drift in a negative side, remaining more positive, than with steel. All it is caused by porosity of superimposed coats and that condition that substrate material turns on in the coat at formation in it of solid solution Fe-Ni, the complex oxide Fe5TiO8. X-ray analysis shows also presence α-Fe. The stationary potential of nickel at the moment of plunging makes -2 mV. It is refined in first 40 minutes to value +59 mV, then shifted in a negative side to-9 mV at an exposure, equal 160 minutes, after a day its value-30 mV, and in 48 hours - is sharply shifted in the cathode field, attaining value -205 mV. Alloying of the titan by nickel leads to formation of the coat containing except the titan, its nitride TiN, corrosion resistant intermetallic compound Ti2Ni and double oxide Ti4Ni2O. The potential at the moment of plunging of the sample in a solution is equal +217 mV and till 90 minutes of an exposure remains almost constant, being slowly shifted in a negative side at increasing of a time of trials, attaining at 200 minutes of value equal +171 mV. At alloying the nickel by the titan in a coat pure nickel, nitride of the titan and intermetallic compound Ni3Ti, which is not corrosion resistant is visible. Value of potential at the moment of plunging of the sample in an electrolyte adopts a value +65 mV. Within the first 25 minutes, it drifts in a negative side, to value +26 mV. Till 200 minutes of an exposure it slowly refining to value, equal +10 mV, accepting more negative values at an exposure within days or two (-10 and -23 mV accordingly).