Hot Dipping: Galvanizing

A protective coating may be applied on metal surfaces by dipping

into certain molten metals namely zinc, tin, or an alloy of lead and

tin. Dipping is an economical way of putting on a heavy and

enduring coating. To obtain an even coating on small objects such as

nuts, bolts, pins and washers the objects are centrifuged after being taken from the molten bath until the coating is hard. Zinc dipping or hot galvanizing is widely used on steel as an effective protection against corrosion. The parts are first cleaned and fixed in a solution of zinc chloride and hydrochloride acid.