The surface morphology and chemistry of oxide scales formed on select chromia-forming alumina-forming ferritic steels have been studied after exposure to a dual atmosphere hydrogen air. Localized Fe-rich nodules with whiskers/platelets form at the onset corrosion. initiation growth localized breakdown passivation are attributed presence hydrogen, inclusion iron in passivating scale, subsequent ...

Heat-resisting alloys are designed to survive high-temperature oxidation by forming a slow-growing scale, usually Cr 2 O 3 , which acts as barrier between the metal and its environment. However, that succeed in this way when exposed hot oxygen or air fail do so CO gas. Instead, they exhibit rapid “breakaway” corrosion, developing oxides of alloy base iron and/or nickel. The growth these non-pro...