Abstract
Breakaway corrosion remains a challenge for many high temperature applications. The oxide formed after breakaway is commonly considered non-protective. This study investigates the protective properties after breakaway on a wide set of (Fe,Cr,Al/Ni)-model alloys by thermogravimertric analysis, ion/electron microscopy and X-ray spectroscopy. The results show that the oxide scales formed after breakaway exhibit similar microstructural features on all FeCr(Ni/Al)-alloys, and that the growth rate is greatly influenced by alloy composition for some alloys while is has little influence on others. This observation may be of great help in the selection and development of materials for use in harshly corrosive environments.
Highlights
High temperature corrosion of Fe-based alloys remains a challenge in many high temperature applications
The results from this study indicate that the primary corrosion protection of FeCrAl alloys ((Al,Cr)2O3) act similar to the Cr-rich type of oxide scale at intermediately high temperatures, e.g. 600 ◦C, in good agreement with recent investigations [35,40]
The results from this study shows that an increased amount of Ni in the alloy is beneficial for the secondary corrosion protection up to approx imately 5 wt%, after which Ni does not influence the growth rate significantly
Summary
High temperature corrosion of Fe-based alloys remains a challenge in many high temperature applications. The corrosion protection of stainless steels and FeCrAl alloys exposed in mild environments rely on the for mation of a slow-growing Cr-rich (stainless steels) or Al/Cr-rich (FeCrAl alloys) M2O3 oxide scale. These oxide scales are the designed corrosion resistance of stainless steels and FeCrAl alloys and is here referred to as their primary corrosion protection. Typical for the primary corrosion protection is that the oxide growth rate is slow and limited by ion diffusion. The oxide growth of the primary corrosion protection is possible to model by diffusion-based modeling tools such as, e.g. DIC TRA [4]. Low alloyed steels only have one type of corrosion protection, composed of a multi-layered Fe-rich oxide scale
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