MANUFACTURE AND CORROSION OF LEAD SHOT FROM THE FLAGSHIP MARY ROSE

摘要

The corrosion resistance of lead-iron shot was found to depend upon the method of manufacture. Shot in which the lead had been wrapped around a sphere of cast iron suffered relatively little corrosion. Those made by casting molten lead into a mould containing a cube of wrought iron corroded where the cor- Ners of the iron were exposed to the seawater, that is, bimetallic corrosion occurred. The lead corroded to give A complex mixture of compounds which formed a protective layer.