A Comparative Study of the Structure and Properties of Zinc Coatings Deposited with Various Methods

Abstract:

One of the most effective methods for the protection of ferrous substrates from corrosion is zinc hot-dip galvanizing. Although this method has many advantages, it is characterized by a very negative effect on the environment. In the present work Zn coatings were formed with thermal spraying, pack cementation and fluidized bed reactor, which are friendlier to the environment. Their microstructure was characterized with X-ray diffraction and scanning electron microscopy, while their corrosion performance was estimated with exposure in a salt spray chamber. From this investigation it was deduced that CVD coatings are composed by two layers referring to Γ-Fe11Zn40 and δ-FeZn10 phase of the Fe-Zn phase diagram. By contrast the thermal coatings are very porous and composed by pure Zn. However, the corrosion performance of all coatings is similar. This conclusion is very important because it verifies that hot-dip galvanizing could be replaced by the other coating methods.

• Periodical: Solid State Phenomena (Volume 130)
• Pages: 207-212
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.130.207
• Online since: December 2007
• Authors: G. Vourlias, N. Pistofidis, D. Chaliampalias, F. Stergioudis
• Keywords: Corrosion, Fluidized Bed Reactor, Galvanizing, Pack Cementation, Scanning Electron Microscope (SEM), Thermal Spraying, X-Ray Diffraction (XRD), Zinc Coating

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