got caught up thinking about zinc now. Obsessing really….
confusing kinda ?? Can be a little…all because of zinc —- and those other metals that are all grey too, so got to thinking about it and well,
ALL were used to make whistles !!! However our special area of interest tonight issssss….yes ZINC !!!! Here are a few bits of trivia to chew on…..
Cast zinc is brittle when cold. Heated to 200°, it is ductile as well as malleable, and may be rolled into sheets retaining these properties at that temperature; while, if the temperature be allowed to exceed 400°, the zinc returns to its original condition of brittleness.
Zinc does oxidize more easily, that's why steel is plated with it. The zinc nearest to the environment, the exposed surface, oxides, and this oxide forms a protective layer for the rest of the zinc and the steel. The same principle would work with steel as well, but for the fact that iron oxide, rust, flakes off all to easily, exposing fresh metal
— exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a dull grey, fairly strong material that stops further corrosion.
The easiest alloy to cast, it offers high ductility, high impact strength and is easily plated. Zinc is economical for small parts, has a low melting point and promotes long die life.
When molten zinc solidifies it expands somewhat, thus giving perfectly sharp castings
………..pennies are made of zinc with a copper coating.
So for now let's say circa 1920-40 on zinc escargots ?? Certainly would like to pin it down closer but for now at least here is a starting point 🙂 Ironically as cheap as they were made, they could become more valuable with a little extra attention….