Which risk increased in 18th-century wooden sailing ships when hull sheathing changed from tarred felt to copper?

💡 Explanation

When copper sheathing was introduced, galvanic corrosion occurred because copper is more noble than iron, accelerating the iron's oxidation in the presence of seawater electrolyte. Therefore, rapid corrosion of iron fasteners resulted, rather than barnacle growth, hull electrolysis, or fungal decay, which involved different chemical or biological mechanisms.

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