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2104 |
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Monday, May 03, 2010, Hullet Room 5:00 PM Off-Shore |
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Study of corrosion behavior of Al and Al-Zn wire arc sprayed mild steel in offshore applications |
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Hamidreza Salimijazi* / Isfahan University of Technology, Iran Erfan Abedi / Department of Materials Engineering, Isfahan University of Technology, Iran Mohammadali Golozar/ Department of Materials Engineering, Isfahan University of Technology, Iran Javad Mostaghimi/ Centre for Advanced Coating Technology, University of Toronto, Canada Larry Pershin/ Centre for Advanced Coating Technology, University of Toronto, Canada |
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Thermal sprayed aluminum and zinc have been used for many years for long term corrosion protection. They can be used for protection of offshore infrastructures. In this study, aluminum and aluminum-zinc alloy were deposited on sheet of mild steel by twin wire arc spraying. Some mild steel samples were painted by a suitable paint for ferrous surfaces (zinc rich silicate) for references. The coated samples were painted by a suitable paint for non ferrous surfaces (Zinc phosphate epoxy). The microstructure of coatings and the interface between the coating and substrate were characterized. Results showed good contact between the coatings and substrate and low level of porosity (as low as 1%) in the coatings. The corrosion behavior of the uncoated, coated, and coated plus painted samples was studied by using salt spray and corrosion accelerated tests. The corrosion tests were performed under sea water conditions. The corrosion tests results showed that the corrosion rate of coated and painted samples were much lower than the uncoated samples. The corrosion rates of the thermally sprayed coated samples (without painting) were slightly higher that painted samples. |