Zinc-iron alloy coatings have been found by Chrysler to provide superior corrosion protection vs. pure zinc coatings when tested using chipping corrosion, outdoor exposure, and accelerated provindg ground corrosion methods. The initial Zn-Fe alloy product provided by the domestic steel industry to Chrysler for use in exposed applications was 1-1/2 side or G60/A01 product - galvanneal on the exterior surface and galvanize on the interior surface. More recently Chrysler has been moving to a two-side galvanneal product to take full advantage of the superior performance of Zn-Fe alloy coatings. While exposed applications were originally intended to utilize electrolytic co-deposited Zn-Fe alloy coatings, the limited availability of electro zinc-iron coated sheet has necessitated the development of galvanneal for exposed body panel applications. An historical review is given of LTV's development of 1-1/2 side hot-dip product and its evolution into two-side galvanneal to meet Chrysler's current corrosion protection requirements. The formability required for automotive exposed applications originally had required pre-batch annealing of the low carbon substrate; however, excellent 'r' and elongation properties are increasingly being provided by ultra low carbon stabilized steel which are in-line annealed. LTV's recent experience with these stabilized products in galvanneal applications is discussed.
Development of hot-dip Zn-Fe alloy coated steels for exposed automotive applications
Entwicklung eines mit ZnFe-Legierung feuerverzinkten Stahles für offene Kraftfahrzeugteile
1989
13 Seiten, 16 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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