Zinc anodes are also commercially available in two alloys, one for
use in soils and the other for seawater applications. Zinc may
undergo rapid intergranular corrosion at temperatures above 120°F
(50°C). At temperatures above 130°F (50°C) and particularly in the
presence of carbonates, zinc can passivate and the potential of the
passive film can become more noble than steel, leading to corrosion
of the steel.
Zinc is particularly useful in sea-water applications where its low driving potential against steel is insufficient to cause damage to most paints and enables the current output to vary with demand; thus, it is to some extent self-controlling. Zinc anodes do not normally evolve hydrogen nor is there a risk of thermite sparking.
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