Add time:07/19/2019         Source:sciencedirect.com

The initial stage of oxidation reactions at the surface of the stainless steel Sanicro 28 (Fe31Cr27Ni) exposed to KCl, NaCl, or K2CO3 in flowing dry and humid air at 535 °C was investigated using chronoamperometry, SEM–EDX and XPS. All studied salts accelerated the corrosion process. Na+ resulted in a higher amount of Na2CrO4 and a thicker chromium–rich scale compared to K+. CO32− was involved in a reaction with iron only under humid conditions. The results show that humidity affects the corrosion mechanisms and it should thus be taken into account especially in the combustion of biomasses with high humidity.

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