Abstract
The oxidation behaviour of a 20% (by mass) Cr, 25% (by mass) Ni, niobiumstabilized steel in carbon dioxide at 1123 K and a pressure of approximately 0.1 MPa has been investigated by using charged-particle nuclear techniques and conventional methods. The nuclear techniques were used to study the growth mechanism, thickness and surface composition of the oxide. The scale consisted of an outer spinel layer, a layer of Cr
2
O
3
inside this and then a silicon-rich layer at the oxide-metal interface. The scale grew primarily by cation transport but some oxygen diffusion also occurred.
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