Thermodynamic Duality of Corrosion and Scale

Definition

Corrosion and scale are two ends of the same thermodynamic search for lower-energy arrangements, one dismantling order and the other creating it. In corrosion atoms leave a solid lattice; in scale dissolved ions assemble into a new solid.

Both processes are driven by the same drive toward lower-energy states, so thermodynamics both tears structures apart and, under the right conditions, builds them. The tension at the heart of water treatment is that conditions which suppress corrosion often encourage scale, and waters that resist scale may leave metal exposed. The water treater lives between those outcomes, managing one without inviting the other.

Related concepts

Langelier Saturation Index · Fugitive Calcium Carbonate Film · Corrosion

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Part of The Blueprint of Water · 🔥 thermodynamics