The corrosion behaviour of an alumina-forming heat resistant alloy with high Ti (Fe-35Ni-16Cr-4.5Al-3Ti, wt%) was evaluated in high temperature steam. The alloy developed interfacial α-Al2O3 layer during the pre-oxidation treatment in air at 750 °C. However, it formed external Cr2O3 and internal γ-Al2O3 oxides on the austenite matrix during the steam corrosion at 750 °C for 1000 h. This behaviour is attributed to the increased oxygen permeability into the austenite matrix from the synergistic effect of steam and Ti. Meanwhile, the pre-oxidized alloy with interfacial α-Al2O3 layer showed improved corrosion protection with reduced weight gain in steam environment.
Bibliographical noteFunding Information:
This study was mainly supported by the Nuclear Research and Development Program (no. 2016R1A5A101391921 and 2019M2D2A2050927) of the MSIT/NRF of the Rep. of Korea. Financial support for two of the authors is provided by the BK-Plus Program of the National Research Foundation (NRF) of the Rep. of Korea. The supports from the KAIST Analysis Center for Research Advancement (KARA) are acknowledged.
- Alumina-forming alloy
- High temperature corrosion
- Internal oxidation
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)