A "multi-pollutant exposure programme" reflecting the new pollution situation where SO 2 is no longer the dominating pollutant has been performed by the International Co-operative Programme on Effects on Materials, including Historic and Cultural Monuments (ICP Materials) within the activities of the Convention on Long-range Transboundary Air Pollution. The main results obtained in the period 1997-2003 are summarised. Dose-response functions are presented for carbon steel, zinc, copper, bronze and limestone. Parameters involved in the functions include besides SO 2 and pH, which were included in the previously developed functions from ICP Materials, also the effect of particulate matter and HNO 3 .
The results of the sulfur dioxide measurements are shown in Table 7. The time of wetness values were determined from the relative humidity results using the procedure shown in ISO 9223, where wetness is assumed whenever the relative humidity is above 80% and the temperature is above 0°C. The values shown in Table 8 are in hours per year. The chloride deposition rates were determined from the wet candle technique and are shown in Table 9 as mg NaCl /m2 day.
Atmospheric corrosion poses a significant problem with regard to destruction of various materials, especially metals. Observations made over the past decades suggest that the world’s climate is changing. Besides global warming, there are also changes in other parameters. For example, average annual precipitation increased by nearly 10% over the course of the 20th century. In Europe, the most significant change, from the atmospheric corrosion point of view, was an increase in SO2 pollution in the 1970s through the 1980s and a subsequent decrease in this same industrial air pollution and an increase in other types of air pollution, which created a so-called multi-pollutant atmospheric environment. Exposed metals react to such changes immediately, even if corrosion attack started in high corrosive atmospheres. This paper presents a complex evaluation of the effect of air pollution and other environmental parameters and verification of dose/response equations for conditions in the Czech Republic.
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