Abstract
The corrosion behavior of pure Fe and Fe-Cr alloys with different Cr content in the presence of a solid NaCl deposit and water vapor at 600degreesC was studied. Results indicated that the corrosion of pure Fe was severe even in air at 600degreesC and the scale formed on the surface was compact and uniform. However, with a solid NaCl deposit on its surface, the corrosion of pure iron in air was suppressed to some extent, but the presence of water vapor in the atmosphere causes accelerated corrosion. Under the synergistic effect of NaCl and water vapor, the corrosion of pure iron is accelerated more significantly. In contrast with the known effect of Cr content on the oxidation of Fe-Cr alloys, an increasing Cr content in Fe-Cr alloys increases the corrosion rate of the alloys under the synergistic effect of solid NaCl and water vapor. A mechanism to explain the effect of water vapor and NaCl on the corrosion of pure iron and Fe-Cr alloy is proposed.
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