Hot-dip galvanizing, is the process of dipping fabricated steel into a kettle or vat containing molten zinc. The process is inherently simple which provides a distinct advantage over other corrosion protection methods. While the steel is in the kettle, the iron in the steel metallurgically reacts with the molten zinc to form a tightly-bonded alloy coating that provides superior corrosion protection to steel.
Zinc die casting is a metal casting process characterized by pressuring molten zinc into the mould cavity. The mould cavity is created using two hardened tool steel moulds that are machined to the net shape or near net shape of the zinc die casting parts. Zinc die casting process allows products to be made with high degree of accuracy and repeatability.
Machining is a process in which a material (often metal) is cut to a desired final shape and size by a controlled material-removal process. The processes that have this common theme are collectively called subtractive manufacturing.