In this work, possible corrosion mechanisms of Fe- and Ni-based alloys are discussed which are protected by Cr2O3, NiO and MoO2 surface layers. But chloride ions can dissolve these oxide films and there is a strong synergistic effect between hydronium ions and oxygen, leading to severe local alloy corrosion. On the other hand, titanium and Zr-3 alloys show good corrosion resistance in acidic oxidising subcritical water containing different inorganic salts. A double-layer oxide film (TiO and TiO2) is formed on the surface of TA2 and TA9 alloys, while a triple oxide layer (TiO, Ti2O3 and TiO2) is formed on TA10 surfaces in such aqueous solutions containing chloride and sulphate ions. In addition to the two oxide layers, Ti3(PO4)4 deposits are also formed on the surface of TA2 and TA9 alloys when the subcritical water contains phosphates. Moreover, (TiO)2P2O7 deposits form besides Ti3(PO4)4 layers on the surface when the TA10 alloy is oxidised under the latter conditions.
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