ČESÁNEK Zdeněk University of West Bohemia

Spoluautoři SCHUBERT Jan

In terms of corrosion protection, metal passivity is a very important phenomenon, as it leads to slower corrosion process in oxidative environments. This phenomenon is of particular advantage in power plants, where electrochemical corrosion, especially on surfaces of components, occurs very often. In this study, selected cermet and alloy based coatings were investigated. The selection of coatings was carried out considering their potential use in power plants. The selected coatings were Cr3C2-NiCr, Cr3C2-CoNiCrAlY, TiMoCN-Ni, Stellite 6, Hastelloy C -276 and NiCrBSi. These coatings were deposited on W.Nr. 1.0421 substrate carbon steel using HP/HVOF and were tested using potentiodynamic corrosion tests. The surface after corrosion testing was evaluated by optical microscopy. The microstructure of selected coatings after deposition was evaluated by SEM microscopy. The results show that cermet coatings exhibited the highest resistance in 5% electrolyte solution of H2(SO)4 and Hastelloy C-276 reached the highest resistance out of alloy based coatings.

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