Aspects of corrosion of iron‐ and nickel‐based materials by liquid tin: Oxygen dissolved in the melt and saturation with the parent element
Cylindrical samples of iron, austenitic steel 1.4571, and nickel‐based alloy 2.4663 were tested in liquid tin (Sn) at 500 and 700 °C. The exposure times ranged from 3 to 100 h. During exposure the oxygen content of the melt was measured online. In case the oxygen content is higher than the oxide threshold, even Fe‐oxides, which were not specifically created before exposure, are capable of reducing liquid Sn corrosion. In case of lower oxygen contents more stable oxides, like Cr‐oxides, fail locally leading to corrosion pits. The influence of saturation with the parent element of the tested alloy on material consumption and morphology of corrosion scales was also investigated. Saturation reduces material consumption and promotes formation of intermetallic compounds of the respective parent element and Sn. The capacity of liquid Sn for taking up nickel leads predominantly to selective removal of nickel from the corrosion scale on austenitic steel and nickel‐based alloy samples, whereas the less soluble elements remain. Finally, typical rate laws were tested for expressing the observed material consumption as a function of time.
Corrosion of liquid tin on iron, austenitic steel, and nickel‐based alloy was analyzed at 500 and 700 °C. Oxide layers, stabilized by the melt oxygen content, were able to reduce corrosion. In case of a melt saturated by the alloy parent element, material consumption is lower and intermetallic layers thicker. Nickel is selectively removed from corrosion scales, contrarily to less soluble elements.
Thomas Emmerich, Adeline Durand, Valentyn Tsisar, Carsten Schroer
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