Resistance
of zinc thermal sprayed coatings on different corrosive environments |
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Authors: | G Vourlias N Pistofidis D Chaliambalias K Chrissafis El Pavlidou G Stergioudis |
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Institution: | 1.Physics Department,Aristotle University of Thessaloniki,Thessaloniki,Greece |
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Abstract: | Zinc coatings on ferrous substrates are possible to be applied with
thermal spraying. In the present work the corrosion behavior of zinc thermal
sprayed coatings deposited on low carbon steel St-37 was examined in a simulated
marine atmosphere (salt spray chamber-SSC) and in a dry atmosphere at elevated
temperature (400°C). The corrosion progress was examined by means of optical
microscopy, scanning electron microscopy, X-ray diffraction and thermogravimetric
analysis. From this investigation it was deduced that in the SSC the coating
is uniformly corroded, while the main corrosion products are hydrated zinc
oxides and chlorides. By contrast at 400°C only a thin, compact and continuous
film of ZnO is formed on top of the coating, which remains adherent to the
ferrous substrate. |
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Keywords: | |
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