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If water is present in acid gases, the conditions may be very corrosive. Low alloy steels are commonly utilized in "dry" Acid Gas Injection wells that are designed to be "water free".
Corrosion resistant alloys rely upon the presence of a passive chromium oxide film on the surface to provide corrosion protection.
CO2 is the most common source of general corrosion in oil and gas production. In the presence of water, CO2 forms carbonic acid which is corrosive.
Galvanic corrosion occurs when two dissimilar metals are in contact in the presence of an electrolyte.
H2S corrosion in the presence of tensile stress may result in catastrophic failure as a result of hydrogen embrittlement by mechanisms such as Sulfide Stress Cracking (SSC) and Stress Corrosion Cracking (SCC).