Isothermal oxidation of Inconel 625 superalloy at 800 and 1000 °C: Microstructure and oxide layer characterization

Corrosion Resistance of Inconel 625 CMT-Cladded Layers after Long-Term Exposure to Biomass and Waste Ashes in High-Temperature Conversion Processes

“…Interesting observations were made for the heterogeneous pattern for the distribution of elements such as Nb and Mo in Figure 4 and Figure 5 . The findings for the investigation in the ash atmosphere were in a good agreement with the results obtained by Rozmus-Górnikowska et al [ 20 ], Solecka et al [ 26 ], and de Sousa Malafaia et al [ 25 ] for Inconel samples without the oxidation or with oxidation in the air atmosphere. All of these authors concluded that there was a significant enrichment of interdendritic areas in Nb and Mo (for Mo the effect was lower compared to Nb), the phases rich in niobium and molybdenum formed at grain boundaries.…”

“…After oxidation, a chromium oxide layer was observed and spinel was additionally detected due to the manganese oxidation at 1000 °C. Comparing the results obtained by other authors [ 12 , 25 ] and in this study, the compounds mentioned above, especially potassium chromate or nickel and chromium oxides, were formed during exposure tests and were assumed to be the main corrosion mechanisms.…”

“…In that region, a fine-grained layer composed of a mixture of NiCr 2 O 4 and Cr 2 O 3 was present below the coarse one. In the work of de Sousa Malafaia et al [ 25 ], the authors examined Inconel 625 at a high temperature. After oxidation, a chromium oxide layer was observed and spinel was additionally detected due to the manganese oxidation at 1000 °C.…”

“…In order to achieve an appropriate price-to-lifetime ratio and significantly extend the life of the boiler parts, an approach based on creating cladded layers of a more corrosion-resistant material on common boiler steels is frequently applied [ 15 , 16 , 17 , 18 , 19 , 20 ]. The desirable materials for working in conditions that increase the risk of high-temperature corrosion include nickel-based alloys and super-alloys [ 16 , 17 , 18 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Among other things, these materials are characterized by properties such as good weldability, high creep resistance, and resistance to high-temperature corrosion.…”

Suspension Plasma Spray Thermal Barrier Coating Systems - Modelling and Performance Characterization Under Isothermal and Cyclic Oxidation Conditions

“…In addition, observing the chemical composition at CX-16 in Table 0-4, it was seen that Nb was present at the interface of the oxide layer and the substrate after 300 h thermal exposure. This phenomenon is consistent with the finding in the ref [110],. where INCONEL 625 was tested at 1000°C in air for 240 h. A Cr depletion zone was formed beneath chromia due to chromia formation.…”