Hydroxide alkalinity as it relates to passive film formation is more important than shown in Pourbaix and modified Pourbaix Diagrams. The crystallographies of the metal surface and the corresponding structure of the magnetite film must also be discussed for optimum magnetite film formation. It was also reported that there was a need to review the current recommendations relating to alkalinity limits in industrial boilers before initiating a project to develop An Alkalinity Supplement/Addendum to the Consensus on Operating Practices for the Control of Feedwater and Boiler Water Chemistry in Modern Industrial Boilers.1,2 This work is currently in progress.

The Schikorr reaction and oxidation vs. reduction chemistry will also be discussed as they relate to industrial boiler systems and the use of reducing agents. It will also be discussed how the coordinated phosphate program coupled with reducing agents provide the best conditions for passive film growth. It should be noted that the AVT (All Volatile Treatment) and OT (Oxygen Treatment) programs are not suited for high pressure industrial boiler applications.

Subject
Hydroxides, Metal surfaces, Passive films, Iron, Peroxide, Corrosion reactions, Polymers, Film formation, Boilers, Magnetite, Passivation, Corrosion protection, Chemical reactions
Keywords:
Corrosion, Passivation, Coordinated Phosphate, Alkalinity, Oxygen Scavengers, Reducing Agents
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2016
Association for Materials Protection and Performance (AMPP)
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