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It is quite possible to solder raw zinc alloy diecastings but it is inadvisable because the tin and/or lead content of the solder diffuses into the surface and creates a thin layer which becomes prone to intercrystalline corrosion.

Castings that need to be soldered should therefore be previously plated, probably with copper or for greatest ease of soldering with copper followed by tin. It is essential that no soldered castings or tin plated castings are returned to the diecaster because small amounts of tin or lead can render a large quantity of zinc diecasting alloy off grade.