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Components of atmosphere

The main components of atmosphere are almost invariant. However, the content of water vapor is an exception that it varies with the changing of location, season and time. Oxygen and water vapor plays a significant role on the processes of atmospheric corrosion. Therefore, atmospheric corrosion can be classified in the following three categories: Dry corrosion Damp corrosion Wet corrosion Component Percent/% Component Percent/% Component Percent/% Atmosphere 100 H2O. Components of atmosphere (Impurity excluded, 10? ) 2. 1 Dry corrosion In the absence of significant water vapor, many common metals develop films of oxide. In the presence of traces of gaseous pollutants, copper, silver and other non-ferrous metals undergo film formation which is known as tarnishing. The tarnishing of silver in…