Definition - What does Dry Corrosion mean?
Dry corrosion occurs when there is no moisture or water to aid corrosion. The metal in such a situation oxidizes with only the atmosphere. This process is very sensitive to temperature, as can be demonstrated by holding a piece of metal to a flame and observing the layer of oxide that forms.
At ambient temperatures, most engineering metals are known to have slow oxidation rates in a given atmosphere. The mechanisms involved make different metals corrode at varying rates. When oxygen gas comes into contact with a metal surface, this causes an oxide layer to form around the metal. The layer of metal oxide limits the amount of oxygen able to reach the metal surface, thus the rate of corrosion is reduced.
Corrosionpedia explains Dry Corrosion
Under hot conditions, dry corrosion occurs at a much faster rate as compared to normal conditions. Alloys rely on the oxidation reaction where they develop a protective scale that resists further corrosion attack. This includes sulfidation and carburization among other attacks of high temperature.