Effects of Alloying Elements on Flash Points of Lead

Abstract

The measurement was made of the flash points, viz., the temperature at which lead and lead alloys suffer heavy corrosion and disintegration in a concentrated sulphuric acid solution. It was observed that the addition of alloying elements within the limit of solubility lowers the flash-point of lead alloys. Their effect may be classified as follows: With the increasing amount of the alloying element, the flash-point of lead alloys is
(1) lowered markedly: e.g. Bi, Sb, Sn, Zn
(2) lowered at first and then increased, but its temperature is lower than the flash-point of pure lead: e.g. Ag.
(3) lowered at first and then increased, resulting in a higher flash-point than that of pure lead: e.g. Ni, Cu, Te.