Laboratory investigations of the impact of dry deposition of SO2 and wet deposition of acidic species on the atmospheric corrosion of galvanized steel |
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| Affiliation: | 1. School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland;2. Laboratory of Bioanalysis, Department of Pharmaceutical Chemistry, Drug Analysis and Radiopharmacy, Medical University of Lodz, ul. Muszyńskiego 1, 90-151 Lodz, Poland;3. Department of Applied Pharmacy, Medical University of Lodz, ul. Muszynskiego 1, 90-151 Lodz, Poland;1. Lab (Hangzhou) for Risk Assessment of Agricultural Products of Ministry of Agriculture, Institute of Quality and Standard for Agricultural Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;2. Institute of Tropical Agriculture and Forestry, Hainan University, Haiko 570228, China;3. Key Laboratory of Agro-Product Quality and Safety of Ministry of Agriculture / Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China;4. Department of Environmental and Occupational Health, School of Public Health, Indiana University, 1025 E. Seventh Street, Bloomington, IN 47405, USA;1. Department of Biomedical Molecular Sciences, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan;2. Department of Nephrology, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan;3. Department of Nursing, Yokkaichi Nursing and Medical Care University, Yokkaichi, Mie 512-8045, Japan;4. Preventive Medicine and Epidemiology, National Cerebral and Cardiovascular Center, Suita, Osaka 564-8565, Japan;5. University of Bari and Schena Foundation, Valenzano, Bari 70010, Italy;6. Department of Nephrology, Aristotle University of Thessaloniki, Thessaloniki, 54642, Greece;7. Institute for Glyco-core Research, Gifu University, Gifu, Gifu 501-1193, Japan;8. Departments of Biochemistry and Molecular Genetics and Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA |
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| Abstract: | A series of short-term laboratory experiments were conducted in which galvanized steel samples were exposed to sub-ppm levels of SO2. Dew was produced periodically on the test panels, and, at the end of some experiments, panels were sprayed with solutions of various pH levels. Both dew and rain rinse samples were analyzed for SO32−, SO42− and Zn.The laboratory results suggest that as a first approximation the damage to galvanized steel induced by the dry deposition of SO2 can be calculated by equating the dry SO2 flux to the Zn corrosion flux. SO2 will deposit onto a fresh dry surface until an amount similar to that of a monolayer has formed. Under wet conditions, the dry deposition flux is controlled by the gas-phase resistance of the atmosphere. Wet deposition of ammonium bisulphate induces corrosion which depends not only on the pH of the incident rain, but also on the exposure history of the samples. |
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