Metal coatings

Corrosion of metals can be controlled by means of a separate environment where metals are placed in isolated states. This can achieve by covering the base metal with a layer of another metal. This process is known as metal coating. Metal coatings are of two types-anodic metal coating and cathodic metal coating. Anodic metal coatings are coatings which are anodic to the base metals. On iron we can coat aluminium, magnesium, zinc and cadmium. These metals are indeed above iron in the galvanic series and udergo corrosion thereby protecting iron. Hot dipping is a method where the base metal is dipped into the molten anodic metal. The process of coating zinc metal on iron material by hot dipping is called galvanizing. Cathodic metal coatings are coatings which are cathodic to the base metal. On iron we can coat tin, nickel, chromium and copper. The process of coating tin on iron by hot dipping method is known as tinning.