Abstract
Models based on ternary diffusion and thermodynamics are advanced to describe the growth of multiphase oxide scales and subscales on binary alloys. These considerations take into account morphological development of subscales and the transition from internal oxidation to superficial scale growth. Diffusion properties are represented by composition profiles on ternary phase isotherms and by paths on oxygen pressure-metal composition isotherms in order to define models for classification of diverse features of high temperature corrosion of binary iron and nickel alloys.
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