Naval brass, as its name suggests, was originally meant to be used for water-related applications, specifically sea water. The open waters have high salinity or salt concentration, which can easily damage metals that are not protected against corrosion. Once corrosion starts, it can be difficult to prevent it from spreading throughout the vessel.
It is for this very reason that naval brass was created. The tin added into the alloy significantly increases the resulting metal corrosion resistance, allowing brass to last and endure saltwater for longer.
On top of anti-corrosion, the presence of tin also helps increase naval brass’ resistance to dezincification, a type of corrosion in which only zinc is removed from a material, thereby weakening it and making it prone to damage. According to maritime history, dezincification used to be known as “condensiritis,” and had been the subject of various attempts at resolution. Read more from this article: http://bit.ly/2IM7BNt
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