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The corrosivity pattern near the tropical coastal city of Townsville, Australia is of interest because of concerns related to the corrosion of RAAF aircraft. The corrosivity at seven sites near Townsville was characterized over a four-year period with bimetallic specimens (CLIMAT units) and salt candles. The CLIMAT results highlight the effects of elevation above the ground and topography on local corrosivity. The increase in corrosivity due to elevation at the same site is readily explained by the increase in aerosol deposition. The flow pattern around objects that significantly obstruct wind is very complicated but one clear conclusion is that the wind flow speed and turbulence are highest near the top. Thus aerosol deposition, and therefore corrosion, rates are higher near the top of obstructions to wind such as hills and buildings. The main conclusion is that the principles of salt aerosol transport and deposition offer a physical framework for understanding and predicting patterns of aerosol deposition and consequently the patterns of corrosivity.
aerosol transport, aerosol deposition, modeling, corrosivity patterns, tropical marine environment
Research Associate, Royal Military College of Canada, Kingston, Ontario
Head, Aircraft Corrosion Control, Aeronautical and Maritime Research Laboratory, Melbourne, Victoria
Professor, Royal Military College of Canada, Kingston, Ontario