Abstract
Electron microscopy and physical adsorption measurements have shown that the oxide scale formed on steel in both alkaline and acid chloride solutions at 300°C contains interconnecting pores. Although reactants are able to diffuse through these pores in aqueous solution, the reaction rate is not necessarily constant. The calculated parabolic rate constant, derived on the assumption that in alkaline solutions it is the movement of soluble iron which is rate controlling, approaches within an order of magnitude of that observed. The possibility that a similar mechanism applies to corrosion in acid chloride solutions is considered.
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