Title: Hot Corrosion of Cobalt-Based Alloy with (Na, K)<sub>2</sub>SO<sub>4</sub> Coating at 900 °C
Abstract:The hot corrosion behavior of pure Co, Co-10Cr and Co-10Cr-5Al alloys coated with (4~4.5) mg/cm 2 (Na, K) 2 SO 4 deposits has been studied at 900 °C in air by thermogravimetry and SEM/EDX analysis. Th...The hot corrosion behavior of pure Co, Co-10Cr and Co-10Cr-5Al alloys coated with (4~4.5) mg/cm 2 (Na, K) 2 SO 4 deposits has been studied at 900 °C in air by thermogravimetry and SEM/EDX analysis. The results show that hot corrosion rate of Co-10Cr alloy was obviously higher than that of Co-10Cr-5Al alloy and hot corrosion rate of pure Co was between those of the two cobalt-based alloys. Both alloys produced complex corrosion scales, containing an outermost layer of pure cobalt oxide and an inner layer where the oxides of both alloy components were simultaneously present on the Co-10Cr alloy, while a middle layer containing CoO and Cr 2 O 3 and an inner layer of Al 2 O 3 with a few aluminum sulfides appeared on the Co-10Cr-5Al alloy. The results were interpreted by taking into account the effect of active element and hot corrosion mechanism.Read More
Publication Year: 2011
Publication Date: 2011-02-21
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 2
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