Abstract
Internal corrosion is an important consideration for metallic structures that contain or may contain conductive electrolytes. Internal corrosion is influenced by a myriad of factors including, but not limited to, types of materials present, electrolyte chemistry, temperature, presence of coatings and process flow characteristics. Experience shows that use of dissimilar metals in storage/process tanks can cause internal corrosion issues or negatively impact the effectiveness of the designed cathodic protection system. These issues can reduce the effectiveness of post-construction corrosion mitigation options. Specific examples from the wastewater treatment and oil and gas industries are discussed and suggestions are made for materials selection improvements to aid in internal corrosion prevention. Additionally, the effectiveness of specific post-construction cathodic protection systems is discussed. It is imperative that the tank designer and corrosion professional work together to mitigate all potential corrosion issues and ensure an effective cathodic protection system is designed prior to tank installation.
