A METHOD OF MANUFACTURING A LEAD-CALCIUM TYPE ALLOY

摘要

An alloy is disclosed which comprises a calcium in an amount of at least 0.03%, sodium in an amount up to 0.05%, optionally tin, and optionally aluminium, balance lead. A preferred method of making such an alloy comprises melting pure lead, adding flakes of pure sodium hydroxide into the molten metal at 360 to 380 DEG C, while stirring, adding between 0.001% to 0.05% pure sodium and raising the temperature of the bath to 460 DEG C before adding calcium to the molten bath as a calcium master alloy while maintaining the temperature of the melt at around 420 DEG C.