Materials and Corrosion
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Online ISSN: 1521-4176
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Recently Published Articles
- Modeling gas turbine materials’ hot corrosion degradation in combustion environments from H2-rich syngas
J. Sumner, A. Potter, N. J. Simms and J. E. Oakey
Version of Record online: 7 SEP 2016 | DOI: 10.1002/maco.201508779
A framework model to predict hot corrosion damage has been produced based on a 2-stage corrosion process (initiation and propagation). Weibull statistics are used to assess the spread in incubation lifetime and final damage distribution. Data populating the model comes from laboratory tests simulating potential integrated gasification combined cycles firing industrial gas turbines on H2-rich syngas.
- Effect of multipass TIG welding on the corrosion resistance and microstructure of a super duplex stainless steel
V. A. Hosseini, K. Hurtig and L. Karlsson
Version of Record online: 7 SEP 2016 | DOI: 10.1002/maco.201609102
A super duplex stainless steel was subjected to multiple tungsten inert gas welding passes with two different heat inputs. Sensitization testing showed significant loss of corrosion resistance of the weld metal, in base material next to the fusion boundary, and in a zone 1 to 4 mm from the fusion boundary due to nitrogen loss and precipitation of secondary phases.
- Lifetime of environmental/thermal barrier coatings deposited on a niobium silicide composite with boron containing M7Si6-based bond coat
R. Braun, A. Lange, U. Schulz, L. Portebois, S. Mathieu, M. Vilasi and S. Drawin
Version of Record online: 6 SEP 2016 | DOI: 10.1002/maco.201608929
On an Nb/Nb5Si3-based alloy, a potential ultra-high temperature material, oxidation protective coatings and ceramic topcoats were deposited reproducing thermal barrier coating systems applied on Ni-based superalloys. These environmental protective systems of yttria partially stabilised zirconia and gadolinium zirconate topcoats with chromia-silica forming bond coat show a remarkable performance during thermal cycling tests at 1100 and 1200 °C in air.
- Oxidation behavior of T91 steel in flowing oxygen-containing lead-bismuth eutectic at 500 °C
S. J. Tian, Z. Z. Jiang and L. Luo
Version of Record online: 6 SEP 2016 | DOI: 10.1002/maco.201609075
The growth model of oxide scale is established in combination with the exfoliation process: (a) magnetite that grows outwards, while Fe-Cr spinel grows inwards. Besides, the solid-state transformation of spinel to magnetite occurs at the magnetite/Fe-Cr spinel interface; (b) magnetite firstly flakes off at the local regions. Subsequently, Fe-Cr spinel and IOZ flake off. The exfoliation region becomes larger with time and can be oxidized in situ again.
- Application of aluminum diffusion coatings to mitigate the KCl-induced high-temperature corrosion
S. Kiamehr, T. N. Lomholt, K. V. Dahl, T. L. Christiansen and M. A. J. Somers
Version of Record online: 6 SEP 2016 | DOI: 10.1002/maco.201609047
Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic-martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high temperature corrosion induced by KCl was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.