Abstract
Oxidation of Co‐10 w/o Cr alloy results in an outer layer, an inner layer with inclusions of and , and an internal oxidation zone. Both oxide layers contain appreciable porosity and the morphology of the inclusions is a function of temperature. The microstructure of scales formed during oxidation is presented. It is assumed that the rate‐controlling step is the solid state diffusion of Co‐ions in the phase, while gaseous oxygen is rapidly transported across pores. The pores short‐circuit the solid state diffusion process and enhance oxidation, while and Co‐Cr spinel inclusions inhibit the oxidation.
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