ASM Cleveland Chapter

• 1: Home
• 2: Meetings
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• 4: Zay Jeffries
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• 9: Sustaining Members
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• 12: Contact

Click on sponsors business card for more information

Zay Jeffries Night

Apr. 17, 2006

Speaker: Robert Rapp 

Topic: High Temperature Materials

Location:  Doubletree Hotel (formerly the Hilton Cleveland South)

Hot Corrosion of Materials

Abstract: A thick film deposit of fused salt on an alloy surface in a hot oxidizing gas causes accelerated corrosion kinetics. Initially, researchers denoted the problem and mechanism as "sulfidation". For gas turbine applications, corrosive fused sodium sulfate exhibits an acid-base character and is an electrolytic conductor. This similarity to aqueous atmospheric corrosion led to renaming the problem "hot corrosion".

Type I hot corrosion occurs at a temperature above the melting point of pure sodium sulfate (886C). Understanding hot corrosion is aided by the use of phase stability diagrams and Pourbaix's approach to aqueous corrosion. A quantitative acid-base scale can be measured by the use of two reference electrodes. The solubilities of many oxides in fused sodium sulfate indicate simple (uncomplexed) acidic and basic solutes. The hot corrosion mechanism is best understood in terms of a fluxing of the protective oxide scale.