Life Style and Technology

Metal with Plastic Coating

Protecting metal from corrode effect have used with many way, using anodizing for aluminum metal, electroplating for steel and other metal coated with other stabilize metal and endure from corrosion.

 

Metal Surface Protection

Metals are essentially artificial and unstable materials, that is to say, they are not found as such in nature (excepting gold and copper) and they tend, under the influence of the weather, waters and similar corrosive exposure, to revert back to a non-metallic state. Metallic Coating In choosing a metallic coating for the protection of a metallic article it is not sufficient to consider the behavior of the coating metal alone. It's necessary also to have regard to the effect of the mutual exposure of coating metal and bases metal at pores, cuts and other initial or subsequent breaks ion the thin film of coating.

 

Barrel Polishing

Another long practiced, but crude method of overcoming the need for mechanization is known as barrel polishing. Originally this was only suitable for small, fairly simple and robust shapes, which were placed in a cylindrical container or barrel, together with a mass of pebbles or rounded abrasive shapes and a lubrication liquid.

 

Metal Coating

Use of Electroplating. Electroplating is a method of producing a smooth, compact and fairly uniform film of metal from an aqueous solution of one of its chemical compounds by means of a direct electric current. The current flows from the aqueous solution to the article being electroplated, which must of course itself be electrically conducting, and which forms the cathode.

 

Coated With Copper

Sulfuric acid is used as solution which has two hydrogen ions. Copper is a metal atom of which has two easily removable electrons. Copper sulfate (CuSO4) is the copper salt of sulfuric acid. In aqueous solution the copper ions, each with two positive charges due to loss of two electrons, separate them selves from the doubly charged negative sulfate ion SO₄^2-.

 

Nickel Coating

Nickel plating is by far the most important electroplating process, chiefly because it is the best undercoating immediately below chromium plating. Nickel is a hard, yellowish-white, non-toxic metal with takes a high polish and has considerable resistance to tarnish and corrosion by weather. Hot Dip Aluminizing Aluminum can also be coated on to iron and steel articles by hot dipping, but the process is considerably more difficult than in the case of tin and zinc, for a number of reasons. Because of the higher melting point of aluminum the process must be carried out at about 700oC, at which temperature it is very difficult to preserve the steel in an oxide free condition.