[Introduction]The stress corrosion cracking behavior and mechanism of 2205 duplex stainless steel production tubing in oil and gas well containing H2S and CO2 were studied.[Method]Under the simulated working environment of oil and gas field,stress corrosion cracking tests were conducted at different temperatures and H2S partial pressures by slow tensile method and four-point bending method. The general corrosion rate was calculated by weight loss method,and the corrosion micromorphology and corrosion products were analyzed by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS).[Result]When the H2S partial pressure was 0.10 MPa,2205 duplex stainless steel suffered from brittle fracture under stress corrosion condition,and its stress corrosion cracking sensitivity was highest at 25 ℃.[Conclusion]The increase of temperature and loading stress can accelerate the anodic dissolution rate,thereby the corrosion rate of 2205 duplex stainless steel increases.
关键词
双相不锈钢/应力腐蚀/硫化氢分压/阳极溶解
Key words
duplex stainless steel/stress corrosion/partial pressure of hydrogen sulfide/anodic dissolution
维普
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