The effect of bismuth on the structure of zinc hot-dip galvanized coatings |
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| Affiliation: | 1. National Technical University of Athens, School of Chemical Engineering, “Research Unit of Advanced, Composite, Nano Materials & Nanotechnology”, 9 Heroon Polytechneiou St., Zografos, GR-157 80, Greece;2. Center for Microscopy-Microanalysis and Information Processing, University Politehnica Bucharest, Splaiul Independentei 313, Sector 6, Bucharest, Romania;1. Institut de la Corrosion/French Corrosion Institute, 220 rue Pierre Rivoalon, 29200 Brest, France;2. Swerea KIMAB, Isafjordsgatan 28A, 11428 Stockholm, Sweden;1. Institut de la Corrosion, 220 Rue Pierre Rivoalon, F-29200 Brest, France;2. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;3. Swerea KIMAB, Isafjordsgatan 28A, 114 28 Stockholm, Sweden;4. voestalpine, voestalpine Strasse 3, 4021 Linz, Austria;5. Thyssen Krupp Steel Europe, Eberhardstrasse 12, 44145 Dortmund, Germany;1. Laboratoire de Magnétisme de Bretagne, EA 4522, Université de Bretagne Occidentale, 6 av. Le Gorgeu, 29285 Brest Cedex, France;2. Institut de la Corrosion, 220 rue Pierre Rivoalon, 29200 Brest, France;1. Department of Chemical and Materials Engineering, The University of Auckland, PB 92019, Auckland 1142, New Zealand;2. Department of Mechanical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;3. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China |
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| Abstract: | Low carbon steel substrates were galvanized in molten zinc containing 0.0, 0.5, 1.0 and 2.0 wt.% bismuth. The as-cast coatings were examined with optical microscopy, scanning electron microscopy and X-ray diffraction. From the above investigation it was deduced that Bi addition does not affect the morphology of the galvanized coatings with regard to the “traditional” galvanized coatings, although it is mainly accumulated in the eta phase and in the upper part of the zeta phase in the form of inclusions. However these inclusions could accelerate the coating corrosion because Bi is cathodic to Zn. Furthermore the thickness of the galvanized coatings is reduced when Bi is added. |
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