Section Of The Buckling And The Electrochemical Corrosion Behavior

In service, oil and gas transmission pipelines would inevitably suffer from abruptly occurring earthquakes or geologic disasters due to the exposure to severe wild ambients for years, resulting in obvious replacement or deformation, so that the pipes would be incapable of working because of buckling. On the other hand, since the soil is corrosive, the buried pipelines would corrode electrochemically, eventually causing pipeline failure which not only affects oil and gas exploitation to bring economical loss but also is a potential threat to civilians and properties. Hence, it’s practically significant to research into the buckling and electrochemical corrosion of steel pipes of buried pipelines.The pipeline buckling research is performed based on all existing data by studying buckling strain and the relations between major factors for it, aiming at obtaining one critical-buckling-strain formula to meet engineering needs, furthermore providing theoretical guidance for the design and application of pipelines. In this research, one electrochemical station will test the pipeline sample placed in one corrosive saline solution for the electrochemical polarization curve to study what corrosion can be done to the sample as well as the speed of it, so that the results can be used for pipeline electrochemical corrosion prevention.Via analysis over the factors that influence pipeline buckling in combination with existing strain formulas, the major factors that influence critical buckling strain can be available; subsequently, models can be established, using Buckling of Thin Elastic Shells and dimensional analysis together with the Full-size experimental data we have. In this way, a critical-buckling-strain formula can be obtained which matches the experimental results and better reflects real buckling strains than the existing criteria. After studying electrochemical corrosion behavior of three pipeline steel sample in NaCl solution, we find0.1mol/L NaCl solution has a strong corrosive. Therefore the conclusions provide theoretical guidance for real application.