The mild carbon steel (CS) A-36 and weathering steel A-588 were exposed to the outdoor atmosphere at two different locations in tropical Panama. After a 10-year exposure, the results indicate that the chloride deposition rate and the type of steel play an important role in the corrosion behaviour of tested steels. Both types of steel mainly contain lepidocrocite and goethite as corrosion products at the urban site, while the corrosion products of steels exposed to a moderate marine atmosphere consisted of lepidocrocite, goethite and maghemite. The large fractions of maghemite in the corrosion products of steel A-36 suggest that this phase is interrelated to the higher corrosion rate of CS in the moderate atmospheric environment.
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