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New cathodic protection (CP) criteria were developed based on AC and DC current densities measured using coupons. Using these criteria, the design of CP systems for newly constructed pipelines, paralleling high voltage AC power lines, and DC rail transit systems, was successfully performed.
Many alloys exposed in high-temperature process equipment corrode by sulfidation corrosion in the presence of H2-H2S gases. This paper discusses the latest results of an extensive testing program for a diverse group of about 15 commercial alloys exposed to temperatures of 300 - 900°C with exposure times up to 6,000 hours.