The effect of aluminium addition on the high-temperature oxidation behaviour and Cr evaporation of aluminised and alumina-forming alloys for SOFC cathode air pre-heaters

Abstract

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Influence of Temperature and Water Vapour on the High-Temperature Oxidation and Cr Evaporation Behaviour of High-Cr Alloys for SOFC Cathode Air Pre-Heaters

“…The reasons for the undetectable alumina phase on AluChrom 318 were explained in our previous study due to two possible reasons; either the oxide grains were amorphous or/and the oxide grains had an extremely small size 10 . However, the formation of Al 2 O 3 on AluChrom 318 exposed at 850°C in the air with 3 vol% H 2 O had been confirmed by the TEM cross-section study in our previous work 10 .…”

“…The Cr evaporation tests were conducted by exposing one type of stainless steel coupon (triplicate) in a denuder set-up installed within a tubular furnace (Vecstar HZ ST 1100). A detailed description of the denuder setup can be found in 9,10 . In this work, the influence of temperature and water content on the Cr volatilization of uncoated Inconel 625, SS309, and AluChrom 318 was examined.…”

Effect of Temperature and Water Content on the Oxidation Behaviour and Cr Evaporation of High-Cr Steels for SOFC Cathode Air Preheaters

“…in a denuder set-up installed within a tubular furnace (Vecstar HZ ST 1100). A detailed description on the denuder setup can be found in [19,22]. In a denuder setup, a quartz tube coated with Na 2 CO 3 on the inner wall was used for collection of volatile Cr(VI) species (CrO 2 (OH) 2 dominated) produced in the simulated SOFC environment on the basis of Eq.…”

An Accelerated-Based Evaluation Method for Corrosion Lifetime of Materials Considering High-Temperature Oxidation Corrosion

“…Equation ( 1) establishes a quantitative model of high-temperature oxidation corrosion by determining the mass of oxide ∆ω generated by a metal at various temperature steps within a given time. Typically, in material corrosion studies, "corrosion rate per year" and "corrosion depth" are used to illustrate the corrosion resistance of metal materials [24,25]. Two or three parallel samples are produced at the same temperature step, and their weight gain data are collected to calculate the corrosion rate k p of the metal at different temperatures, which can then be used to determine its lifetime value (a definite value) at that temperature if a threshold value is provided.…”