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10202 Alkali Sulfate-Induced Hot Corrosion Resistance of Various Heat-Resistant Alloys

Picture for 10202 Alkali Sulfate-Induced Hot Corrosion Resistance of Various Heat-Resistant Alloys
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Product Number: 51300-10202-SG
ISBN: 10202 2010 CP
Author: Vinay P. Deodeshmukh and Lee M. Pike
Publication Date: 2010
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This study compares the Type I hot corrosion resistance (i.e. 900°C/1650°F) of various Ni-, Co-, and Febase solid-solution strengthened alloys. The hot corrosion conditions were simulated by depositing alkali sulfate salt on the test samples and then exposing those samples in a laboratory scale furnace rig to catalyzed air: SOx atmosphere. Sodium sulfate (Na2SO4) salt was used to bring about the hot corrosion.

Alloy performances were compared by assessing the weight-change behavior and performing metal recession measurements that included metal loss, average internal penetration, and maximum internal penetration as measured using optical microscopy. SEM/EDS analyses were also performed to characterize the corrosion products. In general, it was found that the alloys that contained relatively high amount of Cr (> 25 at.%) exhibited excellent hot corrosion resistance compared to other alloys selected in the study.

Keywords: Hot corrosion, alkali sulfate salt, solid-solution strengthened alloys
This study compares the Type I hot corrosion resistance (i.e. 900°C/1650°F) of various Ni-, Co-, and Febase solid-solution strengthened alloys. The hot corrosion conditions were simulated by depositing alkali sulfate salt on the test samples and then exposing those samples in a laboratory scale furnace rig to catalyzed air: SOx atmosphere. Sodium sulfate (Na2SO4) salt was used to bring about the hot corrosion.

Alloy performances were compared by assessing the weight-change behavior and performing metal recession measurements that included metal loss, average internal penetration, and maximum internal penetration as measured using optical microscopy. SEM/EDS analyses were also performed to characterize the corrosion products. In general, it was found that the alloys that contained relatively high amount of Cr (> 25 at.%) exhibited excellent hot corrosion resistance compared to other alloys selected in the study.

Keywords: Hot corrosion, alkali sulfate salt, solid-solution strengthened alloys
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