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Glossary

Class A Certification

5.1.1   Corrosion Definition & Scope

 

Definition: Corrosion has been defined as:

  “The destruction or deterioration of a material because of reaction with its environment.”

Mars G. Fontana

Corrosion Engineering

Scope: Corrosion can be characterized as:

         Not restricted to metals

         Includes ceramics, plastics, rubber, & other non-metallic materials

         Can be fast or slow reacting

         Depending upon the material all environments can be corrosive

 

The environment in which corrosion occurs is typically categorized as wet or dry and this difference can have a significant impact upon the corrosion of a metal. For example consider chlorine.

 

Chlorine, in its natural state is a gas (dry). However, it can also be manufactured into liquid (wet) form. In its gas (wet) form chlorine is normally corrosive to ordinary steel. Yet, in liquid (wet) form chlorine is extremely corrosive to ordinary steel and other common metals.

 

However, a dry versus wet environment can have unexpected results. For example, when we consider titanium, dry (gaseous) chlorine is far more corrosive than wet (liquid) chlorine.