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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >The Effect of Oxygen Source on the Reaction Mechanism of Potassium Chloride-Induced High-Temperature Corrosion
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The Effect of Oxygen Source on the Reaction Mechanism of Potassium Chloride-Induced High-Temperature Corrosion

机译：The Effect of Oxygen Source on the Reaction Mechanism of Potassium Chloride-Induced High-Temperature Corrosion

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摘要

The role of two oxygen sources, air and water vapor, in the initiation of KCl-induced high-temperature corrosion was addressed with three different commercial alloys typically used in power plants. The focus was on the initiation of the corrosion reaction, so an exposure time of 120 min at 540°C was used under flowing conditions. The possible selectivity of oxygen in the corrosion reaction was studied by using two different stable oxygen isotopes, ~(16)O in air and ~(18)O in water vapor, and identifying the isotopes after the reaction with of time-offlight secondary ion mass spectrometry (ToF-SIMS). In addition, the surface morphologies were imaged with scanning electron microscopy and energy dispersive x-ray spectroscopy (SEM-EDX) and the depth profiles mapped with x-ray photoelectron spectroscopy (XPS). Despite the chemical composition of the tested alloys, the alloy surface appears to favor a direct reaction with oxygenfrom water vapor, when available. On the contrary, the oxygenfrom air is more involved in reaction(s) forming potassium chromate (K_2CrO_4). The formation qf K_2CrO_4 provides further evidence of the role of potassium in the initiation of KCl-induced high-temperature corrosion.

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