2. Mechanisms of marine corrosion
The main modes of corrosion are all liable to come into play. The specific characteristics of seawater, however, easily lead to pitting corrosion and crevice corrosion, encouraged by chloride ions, galvanic corrosion, encouraged by the increased electrical conductivity, and biocorrosion, encouraged by biological activity. Finally, marine corrosion occurs differently depending on whether the metal is permanently submerged, alternating with dry periods, only in contact with sea-spray, etc.
2.1 Corrosion zones
The behaviour of materials in respect of corrosion can vary considerably according to their exposure conditions, and the different zones need to be identified, as summarised in figure 2.
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Mechanisms of marine corrosion
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