Soil Corrosivity at Main Gas Pipeline Accident Site

Analysis of five soil samples from a gas pipeline accident site revealed varying corrosivity toward steel pipe, with corrosion rates ranging from 0.028 to 0.111 mm/yA. The presence of water-soluble salts in moistened soil and the alternation of different soil types intensified aggressiveness. These conditions promoted the formation of macro-corrosion pairs at soil boundaries and facilitated electrochemical processes in thin electrolyte films beneath damaged coatings, accelerating steel degradation. Overall, the findings highlight significant corrosion-related risks contributing to pipeline failure and structural deterioration.