| Abstract Scope |
Improved titanium coatings with high corrosion resistance have been developed based on thermodynamic modeling of a gas environment formed under non-stationary temperature conditions. The following gaseous compounds are formed: AlCl, AlCl2, Al2Cl6, AlI, AlI2, AlI3, Al2I6, AlHCl, AlH2Cl, AlOCl, CrCl, CrCl2, CrCl TiCl3, TiOCl, TiOCl2, TiCl4, TiI, TiI2, TiI3, TiI4. The universal program for calculating multicomponent heterogeneous systems TERRA MOD, created on the basis of the new program ASTRA-5, was used. The obtained experimental data on corrosion were used as optimization parameters. The dependences of corrosion resistance in a 10% aqueous solution of HCl have been established, which are described by a polynomial of the fifth degree: Ti-Cr:y = 0.0054x5 - 0.1341x4 + 1.2347x3 - 5.223x2 + 11.803x - 7. The microstructure and phase composition have been studied. The following phases are formed during alloying: (Fe, Cr)23C6, (Fe, Cr)7C3, Cr3C2, as well as the phases: Fe2Ti, Cr2Ti. |