The effect of zinc and zinc alloy coated steel sheets on cosmetic corrosion and perforation corrosion in actual automobiles and the relevant corrosion mechanisms were studied. The main factor affecting cosmetic corrosion on the outside of outer panels was the coating weight of the Zn or Zn alloy coating rather than the type of coating. Perforation occurred in 6-7 years inside of door hems where Zn-rich primer coated steel panels were used, whereas perforation corrosion life was more than 14 years in galvanized steel sheets with a 120 g/m2 Zn coating weight in lapped side-sills. Measurements of the perforation depth and analysis of the composition of the iron rusts formed on automobile bodies in North America showed that the perforation corrosion process in hot-dip galvanized steel sheets can be divided into 4 stages. The period during which Zn corrosion products control corrosion of the steel substrate plays a very important role in determining the period until perforation occurs in automobile bodies in regions where road deicing salt is used. (Engl. translation from JFE GIHO, 2004, No.4, p. 8-14, (jap.))
Assessment and application technologies for automative materials (perforation) - Techniques for corrosion resistance and perforation feedback for automative steel materials
Bewertung und Anwendung von Technologien für Kraftfahrzeugwerkstoffe (Lochfraßkorrosion) - Technologien für die Korrosionsbeständigkeit und Lochfraß-Rückkopplung beim Kraftfahrzeugstahl
JFE Technical Report ; 4 ; 9-16
2004
8 Seiten, 8 Bilder, 1 Tabelle, 23 Quellen
Article (Journal)
English
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