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Material

Forms of corrosion

Biodeterioration of material concerns all sectors of the industry where material are exposed to wet environments.
If corrosion or biocorrosion immediately evokes metallic materials, stainless or carbon steel, cupro-nickel alloys, one must not forget concrete, resin and other composite material

Form of corrosionsCausesReasons
Generalised
Electro-chemical corrosion :
anodic reaction of oxidation of metal and cathodic reaction of reduction of dissolved oxygen
Oxygen and oxidants
humidity
pollution
temperature
LocalisedLocal acidification, presence of bacterial, galvanic coupling, localised fracture of protecting film under the effect of local chemistry or deformationsOxygen and oxidants
Biofilm
Chlorides
Local pH
Mechanical constraints
Heterogeneity of materials


Example of a corrosion mechanism induced by sulfate reducing bacteria.

Flash Animation.



Click to enlarge
Biofilm formed on steel © Corrodys

 

© Corrodys