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Abstract
Atmospheric corrosion seriously affects the working life of construction metals. The quantitative knowledge of the corrosion effects helps the maintenance and the materials’ logistics. In this work, in a military airport located by the sea, the corrosion damage equations of carbon steel, aluminum, zinc and copper are determined after outdoor exposure for four years. Exposure started in 2014, at two different periods of the year, in summer and in winter, for all cases. Weight loss measurements were performed as well as characterization of the exposed metal coupon surfaces by microscopy: optical, electron and atomic force, by X-ray diffraction and Fourier Transform Infrared Spectroscopy. Atmospheric conditions and pollutants were also evaluated. The derived corrosion equations of all tested metals for the exposure have been employed for the 30-year projection of expected corrosion. A parallel 12-month exposure of steel and aluminum—the most common airport metals—have been evaluated for five consequent years to designate the rating of the airport, according to ISO and ASTM Standards. The results showed that there is not a good correlation between the predictions of the Corrosion Damage Algorithm and the Europe Corrosion Map and the actual measurements on steel and aluminum at the site.
Highlights
Atmospheric corrosion is the main parameter in degradation of metallic materials
In 1980, the ISOCORRAG, ICP/UNECE and MICAT programs were launched in order to investigate in depth and understand the phenomenon of corrosion, and at the same time to proceed to a systematic development of prediction models of the corrosivity of the environment
In an extensive research by Morcillo et al [10], no improvement in the correlation coefficients obtained for the Dose Response Functions (DRF) of the four reference metals was observed after a comparison of the estimated corrosivity categories according to ISO 9223 [6] and the categorized atmospheric corrosivity based on the experimental data obtained in the MICAT and ISOCORRAG programs
Summary
Atmospheric corrosion is the main parameter in degradation of metallic materials. According to Simillion et al [1], a corrosion cost at the range of 3–6% of the Gross Domestic Product (GDP) of the economies of the industrialized countries can be considered as common grounds of different studies [2,3,4]. Atmospheric corrosion constitutes a considerable part of this corrosion cost [5]. This has led to an extensive international effort to investigate it, aiming towards minimizing its effects. A major step for the atmospheric aggressivity determination was the publication of ISO Standards 9223-9226 [6,7,8,9] in 1992, based on a relatively small spectrum of experimental data, concerning climatological and pollution conditions. In an extensive research by Morcillo et al [10], no improvement in the correlation coefficients obtained for the DRF of the four reference metals was observed after a comparison of the estimated corrosivity categories according to ISO 9223 [6] and the categorized atmospheric corrosivity based on the experimental data obtained in the MICAT and ISOCORRAG programs
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