Evaluation of the protective properties of multilayer coatings for steam turbine blades |
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| Authors: | E. K. Sevidova V. M. Matsevityi I. B. Kazak K. V. Vakulenko |
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| Affiliation: | (1) Khar’kov Polytechnical Institute, National Technical University, ul. Frunze 21, Khar’kov, 61002, Ukraine;(2) Podgornyi Institute of Mechanical Engineering Problems, ul. Dmitriya Pozharskogo 2/10, Khar’kov, 61046, Ukraine |
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| Abstract: | The results of investigation of the protective properties of multilayer ion-plasma coatings relative to the conditions of their exploitation on steam turbines are described. It was established that the protection properties of coatings on 20X13 steel in an aggressive NaCl environment of various concentrations increase according to the sequence [Cr + (Cr,Ti)N]10 < (Ti + TiN)10 < (Cr + CrN)10. It was also found that a breach in the coating integrity can lead to the appearance of macrogalvanic couples. Their activity considerably increases (by 4–5 times) during the mechanical passivation of the surface under the conditions of drop-collision erosive wear. The greatest values of the EMF in stationary conditions are generated between the 20X13 steel and Ti + TiN coating. |
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