Significant localized corrosion occurred on injection well 13%Cr stainless steel tubing in the field the natural gas is being dissolved in brine. Maximum corrosion rate of 13%Cr stainless steel was 2.1 mm/y. High concentration of sulfur element was detected on corrosion products by X-ray fluorescence analysis. Main cause of this corrosion was considered CO2 corrosion and microbiologically influenced corrosion. The corrosion was not reproduced by laboratory tests using CO2. Sulfuric acid was considered one of the causes of corrosion added for pH control in iodine extraction process.
