Copper Alloys in Oil and Gas Environments

According to NACE MR0175/ISO 15156-3, copper-based alloys are not susceptible to stress corrosion cracking (SCC), with no restrictions on hydrogen sulfide (H₂S) partial pressure, chloride content, temperature, or in-situ pH.

However, general corrosion, also referred to as weight loss corrosion, can occur, particularly in the presence of oxygen.

This is less likely to be a concern in downhole equipment, where oxygen levels are typically low, but may be relevant for surface equipment. It is therefore critically important to establish whether the copper-based alloy will be used in a downhole or surface application before making a final material recommendation.