Abstract
The corrosion of binary iron alloys and of three high alloy steels was investigated in the eutectic 62 mol% Li 2CO 3-38 mol% K 2CO 3 mixture at 650 °C in N 2-15 vol.% O 2 with 15 and 25 vol.% CO 2. Iron corrodes very fast in contact with the melt, forming layers of Fe 3O 4 and Fe 2O 3, which is converted to LiFeO 2 and LiFe 5O 8. The high alloy steels corrode much slower than iron. After short reaction time, alloys containing 16 and 18 wt.% chromium form Fe 2O 3 and FeCr 2O 4. With time, Fe 2O 3 is converted to LiFeO 2 and LiFe 5O 8. High chromium steels form Cr 2O 3 and Fe 2O 3. The Cr 2O 3 reacts with the melt to form K 2CrO 4 and LiCrO 2, Fe 2O 3 is converted to LiFeO 2.
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