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Hydrazine is used as an oxygen scavenger to control corrosion in steam generating systems, despite being a genotoxic carcinogen. This investigation confirmed an Amine Base Vapor Phase Corrosion Inhibitor can be an effective replacement for toxic hydrazine.
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Caustic corrosion is sometimes referred to as “caustic attack or “caustic gouging.” Corrosion of this type may result from internally fouled heat transfer surfaces and the presence of sodium hydroxide in the boiler water; and concentrated solutions of alkali where the normal washing of the tube metal ID is restricted after Departure from Nucleate Boiling (DNB), i.e., when the steam bubble release exceeds the rinsing rate.
This research aims to develop a fundamental understanding of the synergistic effect between molten salt and hot gaseous environments on corrosion mechanisms in kraft recovery boiler superheater tubes.