Fundamental aspects of atmosperic corrosion Important parameters and mechanisms.

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Presentation transcript:

Fundamental aspects of atmosperic corrosion Important parameters and mechanisms

German portal figure made of sandstone from Left picture taken 1908, right picture taken 1969.

Corrosion rate of carbon steel

More humid conditions ConditionAmount of water, µm Critical relative humidity % relative humidity 1 Dew10 Rain100

Relative humidity, Uppsala Hour of the day

Influence of temperature, carbon steel Rain Drying of moisture film, 75% relative humidity

Corrosion rate Rain Sunshine Dew Sunshine Hour of the day

Time of wetness Rh>80% and T>0 o C PlaceRh % ToCToC Tow h / year Gällivare76-1,21600 Prag778,32700 Beijing6011,5840 Chengdu8316,46200 Maximum8766

Climate maps Temperature (T)Relative humidity (Rh) Time of wetness (Tow) Tow Rh>80% & T>0 o C

Synergistic effects, zinc Source: J.-E. Svensson et al, Chalmers, Göteborg

Particulate matter Corrosion of carbon steel due to different salts  0-1 mg  2-5 mg 6-20 mg  mg x (solid line) is Rh at equilibrium with a saturated solution

Corrosion of carbon steel at different levels of salinity

Zinc corrosion temperature dependence

Effect of rain Carbon steelZinc

Summary of important parameters for atmospheric corrosion Climate Air pollutants (gases and particles) Other aggressive substances (clorides) Acid rain wind