Complex requirements a precoated steel must satisfy during pressing, welding, painting and providing optimum corrosion resistance in use, are reviewed. A monofunction coating (zinc or zinc alloy) cannot satisfy all these parameters. A Multilayer Electro Galvanized (MEG) product, Zincrox, was found to be the most suitable to car body applications; the continuously superimposed electrolytic layers are:Zn-Cr-CrOx. The coating is still 99 % Zn, but the thin layers of Cr-CrOx have solved critical problems: formability, weldability, welding fumes, electrode wear, paint adhesion, hydrogen cratering, galvanic contacts and resistance to the most severe corrosion tests with a reduced zinc thickness. Advantages in costs, scrap downpricing, main applications and developments are reported too.
Multilayer electrogalvanized (Zn-Cr-CrOx) steel sheet for optimum corrosion protection of car bodies
Mehrschichtig galvanisiertes (Zn-Cr-CrOx) Stahlblech fuer optimalen Korrosionsschutz von Fahrzeugbaukoerpern
The Study and Prevention of Corrosion. Int. SAE Congr. and Exposition ; SP-538 ; 107-124
1983
18 Seiten, 21 Bilder, 6 Tabellen, 6 Quellen
Conference paper
English
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