Abstract
Isothermal corrosion of TP347H (A1), C22 alloy (A2) and laser-cladding C22 coating (A3) was evaluated by mass loss measurements in molten alkali chloride salts at 450–750°C. Corrosion mechanisms were characterised by scanning electron microscopy, optical microscopy and X-ray diffraction. A3 exhibited superior corrosion resistance, followed by A2, which results from alloying elements, refined microstructure and Cr–O (CrOx), Co(Fe, Cr)2O4 in the corrosion scale. Severe intergranular corrosion caused failure of A1, slight intergranular corrosion happened in A2 but none in A3. Fe-rich oxides were main products of A1 while NiO of A2 and A3 with Cr2O3 and Mo-containing compositions.
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