Metal coating is covering the surface of the metal in order to avoid scratch, create good appearance, wettability, avoid adhesion, avoid wear, and eliminate corrosion and other additional properties. This can be done in several ways either by use of a fabric, paper, film, foil, substrate or either by use of sheet stock. The coating may be done by use of solids, gases as well as by application of some liquids. By use of a drawdown card, the coating on the metal surface can be measured as well as tested for film thickness and proper opacity.
Powder coating- this is done by use of organic polyester, epoxies and acrylic and they are applied to the metal surface for beautification as well as for protection. This is more of an industrial process where powdered resins are mostly used instead of the solvent solutions.
Anodic coatings- this can be done on metals by use of a protective oxide. Magnesium and aluminium coating oxide can be done by making an anode by use of an electrolytic cell. In case there is need to have a permanent colour, the coating is usually impregnated by use of a dye before sealing is done.
Hot deep coating for the low melting metals offer an inexpensive coating to the metal surfaces of a variety of the steel articles. A cleaned metal is immersed in the bath of molten bath of the metal coating. This coating consists of a thin layer of an alloy and some pure metal that attaches to the work as it is removed from the bath.
Cementing metal coatings- this is done on the surfaces of the metals by use of surface alloys that are formed by diffusion into the base metal and it produces a little dimensional change. Some parts are heated in contact with the material coating that is powdered and it forms an alloy of the coating and the thickness depends on the time it is kept in the process as well as the temperature of the treatment process.
Vitreous enamel coatings- these are glassy although they are non-crystalline to offer some durable coating in atmosphere, chemical and high weather temperature environments. A slip of water suspension for wet enamelling is done for crushed glass, suspending agent, flux opacifiers and colouring agents. This is done by flow coating or it’s applied by dipping the metal. The metal is then fired at a certain temperature that fuses into a vitreous coating that is continuous. This is mostly done for the bathtubs. Casting is usually done in a high temperature and the dry enamel powder is then sprinkled over the surfaces for fusion to take place.
For vapour deposition, a coating that is thin and spectacular is formed on the metal surface. The coating is done by condensation of the metal vapour that comes from the molten metal that is discharged from the high voltage between the electrodes or from a chemical means like thermal decomposition (for gas plating) of the metal halides or from hydrogen reduction.
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