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Removal of zinc layers from coated steel strip by thermal and mechanical processing
Author(s) -
Franzen Andreas,
Pluschkell Wolfgang
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905617
Subject(s) - intermetallic , zinc , scrap , metallurgy , substrate (aquarium) , die (integrated circuit) , materials science , layer (electronics) , brittleness , chemistry , composite material , nanotechnology , oceanography , alloy , geology
In this research project, basic investigations on the low temperature reactions of the zinc coating layer with the iron substrate were performed in order to develop novel methods for zinc removal from scrap material by baking the material at a moderate temperature to produce brittle intermetallic compounds, which may be subsequently removed under mechanical load, for instance by shredder treatment. The investigations have shown that it is possible to prepare a fragile Fe/Zn‐intermetallic layer on the substrate by proper baking of the material at moderate temperatures. Mechanical working removes zinc from the strip substrate. The plane of cleavage is the phase boundary between the δ‐ and the Γ‐compound. A precise control of the heating cycle adjusted to the layer thickness is mandatory to attain an effective zinc removal. This requirement is difficult to meet in the operation of an industrial installation.