Definition - What does Organic Matter mean?
Organic matter refers to substances that are composed on a fundamental molecular level from compound cells originating from plants, animals and their associated products. The presence of organic matter on a material increases the rate of corrosion.
Corrosionpedia explains Organic Matter
The presence of organic matter on a metallic surface increases the rates of oxidization on the surface, typically due to decomposition. Increased rates of oxidation thus increase corrosion susceptibility.