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Application of Synchrotron Radiation Photoemission Spectroscopy to Structure Analysis of Thin Corrosion Product Films on Hot-Dip Zn-Al Coatings

Introduction Structures of the thin corrosion products film, in the early stages which formed on hot-dip Zn-0.2%Al, Zn5%Al and Zn-55%Al coatings in humid atmosphere under the presence of NaCl particles, have been investigated by means of photoemission spectroscopy using synchrotron radiation (160 eV) and Al-K radiation (1487 eV). Moreover, the initial corrosion resistance mechanism of Zn-Al alloy coatings is discussed being related to the structure of corrosion products film.