Corrosion behavior of carbon steel in acidic solutions containing thiosulfate and sulfite ions

摘要

The role of thiosulfate on Corrosion has been extensively studied in literature and its effects have been known since the,40s especially in the oil and paper industry. The studies revealed stress corrosion cracking phenomena by polythionic acids and thiosulfate formed due to presence of air and moisture in the the systems. Other failures were evidenced after several years in pressurized water nuclear reactors, in which thiosulfate-based solutions are used to absorb radioactive iodine in emergency case. In the paper industry, sodium thiosulphate led to pitting corrosion on stainless steel drums [3]. In geothermal systems, re-injection water containing thiosulfate and sulfite causes intense generalized corrosion on carbon steel pipelines. However, the mechanism is not yet entirely understood. In addition, no corrosion data are available concerning the simultaneous presence of sulfite and thiosulfate.