Zamak (also: Zamac of Mazak) is a trademark for a group of cheap alloys with zinc as the main component.
The alloys have a relatively low melting point and are easy to cast. Zamag has been replaced in modern car construction by the reprehensible 'plestik'. That is also chromed. On the plus: it does not rust. But just flakes off.
The name is an acronym derived from the initials of the German names for the metals that make up the material: Zink, Aluminium, MAgnesium, Kupfer (buyer).
Zamak was used in the automotive industry for door handles, handles, logos and decorative strips that are then often chromed.
The poorly durable material tends to oxidize craterally and is difficult or impossible to repair.