The POSCO Quality

Electrical Galvanized Steel

Electrical galvanized steel is made by plating steel with zinc in an electrochemical manner. Plating uses pure zinc or zinc and nickel.

Manufacturing Process

Powered by state-of-the-art facility and technology, POSCO operates a totally computerized, end-to-end full automatic production system. This allows us to deliver high-quality and high-performance products fit to the needs of customers.

1. Input Process

Equipment at the entry point of the electrogalvanizing line consists of a pay-off reel, a shearing M/C, a welding M/C, a looper and a tension leveler. The pay-off reel transports stacked or cold rolled steel materials to the shearing machine which cuts and connects them in preparation for welding. Then comes the welding

2. Pre-Treatment Process

An electrolytic cleaning line consists of an electrolysis tank, an acid bath and a rinse tank to remove contaminants and oxide films from the surface of the steel before electroplating.

3. Electrical Galvanizing

The CAROSEL method, among other electric galvanizing, involves the plating of one side at a time by means of a conductor roll. This process produces two-sided, single-sided, differential-sided plated sheets. There is also the horizontal type where two sides of a sheet are plated at the same time to produce a two-sided plated sheet.

4. Phosphate Thin-Film Coating

A phosphate thin-film is applied to the surface of the zinc layer through chemical or electrochemical reactions. The film is intended to provide temporary anti-corrosion protection and to generate a secure painting substrate

5. . Anti-Fingerprinting Process

An organic, inorganic or organic-inorganic hybrid film is applied to the surface of sheet steel in order to supplement its corrosion resistance and to enhance desirable properties such as resistance to fingerprint marks and workability.

6. Output Process

The exit point of the line includes an output looper, tension reel, and an automatic packaging line to protect the products after coil winding.

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