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Zincing

It is estimated by different specialists that corrosion destroys 10% of all smelted metal annually which leads to losses worth milliards.

One of the effective methods to protect steel and cast-iron products from corrosion is to apply a thin protective film of another metal on the surface of the detail.

Chrome, nickel, tin and other metals are widely used for this purpose today. However, zinc coating is more popular. It is explained by comparatively low price for zinc combined with rather high efficiency in resistance to corrosion.

Anticorrosion effect of zinc is manifested in two ways: mechanical and electrochemical protection.

During mechanical protection direct contact of metal surface with environment is expected. When in atmosphere or other corrosion environment zinc as an active metal covers with strong film that is why the speed of surface destruction by corrosion is reducing gradually.

Electrochemical protection is based on the fact that zinc is more electronegative metal than iron. It means that when forming galvanic couple, iron acts like cathode and zinc acts like anode which gets destructed under the influence of electrochemical corrosion. At the cost of this effect zinc keeps protecting iron base even when surface is damaged locally.