The Use Of A Metal Passivation Additive To Eliminate Oxygen Scavenger In A Mixed-alloy System
By Bill Boyd and Dave Clifton
Protection of all alloys throughout the entire steam (boiler)-water cycle against liquid/steam waterside corrosion and deposition mechanisms remains a critical factor determining plant reliability and availability. Traditionally, power stations with mixed-alloy installations (ferrous and admiralty alloys) have adopted the international guidelines for all-volatile treatment (AVT) oxygen reduction (R) treatment protocol/controls (1). These well-recognized and accepted treatment guidelines recommend the use of a reducing agent for oxygen removal. Elimination of oxygen is mandatory and vitally important in the quest to protect copper alloys from oxidation and corrosion when employing steam/feedwater alkalization containing ammonia, hydrazine, carbohydrazide, or amines.
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