Dose-response functions steel

In outdoor atmospheres dry deposition of S-pol-lutants and especially of S0 is of greatest importance. Dose response functions describing corrosion as function of SOp and time of wetness are available for some materrals as steel and zinc. 

As may be seen from FIG. 3 the correlation of the corrosion and the SO2 deposition rate is not as good as for steel and zinc. The following dose-response functions have been obtained ... 

Dose-response functions describing the corrosion as function of SO and time of wetness are today available for steel and zinc. In extensive areas of the temperate climate zone the corrosion loss may be described by SO pollution solely. 

This system of atmospheric classification is now being revised to create a new approach based on dose-response functions for steel, copper, and zinc. Because the corrosion of aluminum occurs by a pitting or localized mechanism, the traditional approach of using mass loss to determine severity of attack is often misleading. Atmospheric corrosion problems with aluminum alloys are most frequently a result of metallurgical conditions rather than environmental conditions, and the behavior of aluminum may be excluded in the upcoming revision of the ISO 9223-6 documents. 

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