03244 Corrosion Behavior of Zinc- and Aluminum-Coated Steels in Marine Environments of Taiwan

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Product Number: 51300-03244-SG

ISBN: 03244 2003 CP

Author: Y.T. Horng, J.H. Lin, J.W. Hsu, H.C. Shih, J.H. Wang, T.C. Chang, H.R Hsu, Y.-c. Lin

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Hot-dip galvanized (zinc coating) steel has been used as a stable outdoor material for many years. It has good corrosion resistance in many atmospheric environments. But in coastal areas metal-coated steel corroded can fail in a short time. Atmospheric corrosion exposure tests were made on galvanized steel, and aluminum-coated steel strands at different sites over ten years. Test sites covered rural, sulfur, industrial and marine areas of the islands of Taiwan. The exposed steels were used in outdoor, telecommunication outside plant applications. The plant is always exposed to polluted air and to severe corrosive environments, and the mutual interaction of the plant metal components and the corrosive environments leads to the failure of the outside plant. In this paper, the atmospheric behavior of three classes of hot-dip galvanized steel wire strands, and one class of aluminum-coated steel wire strand from long-term exposure tests were studied. The corrosion behaviors and products were analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDS) and Electron Spectroscopy for Chemical Analysis (ESCA). The major corrosion product of Class A zinc-coated steel (zinc coating thickness is 32um) in severe marine environment was found to be Fe2O3, and no zinc coating was left for the protection on the base steel after two years. The role of salinity and other weathering parameters were also analyzed by multi-regression analysis. A two-step laboratory test, salt spray after sand blast, was designed to simulate the windy and salty coastal environments and this test was adopted to evaluate the zinc- and aluminum-coated steels. Key words: hot-dip galvanized steel, aluminum-coated steel, SEM, EDS, ESCA

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04022 Experiences on Thermal Spray Aluminum (TSA) Coating for Offshore Structures

Product Number: 51300-04022-SG

ISBN: 04022 2004 CP

Author: Desmond K.K. Tiong, Shell International; Halimah Pit, Sarawak Shell Berhad

Publication Date: 2004

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Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures. Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.