Abstract
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 corners 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. The iron had corroded badly and the metal exposed on cross-sectioning suffered from filiform corrosion. Hence it is essential to protect any remaining iron from the aggressive attack of chloride ions and moisture.
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