Which risk increased when 18th-century shipbuilders introduced iron knees to reinforce wooden hull-frame joints?

💡 Explanation

When iron knees were introduced, galvanic corrosion occurred because iron and copper (or other metals used for fasteners) create a galvanic cell in saltwater, accelerating the iron's corrosion. Therefore, fastener weakening results, rather than friction, stiffness, or stability issues which involve different hydro/mechanical factors.

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