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[wangxinchao,wangyan,houlifeng,zhangshaohua,liubaosheng and weiyinghui.Corrosion Behavior of Long-Term Aged N10276 Alloy in CO2/H2S/Cl- Environments[J].Rare Metal Materials and Engineering,2022,51(8):2754~2760.]
Corrosion Behavior of Long-Term Aged N10276 Alloy in CO2/H2S/Cl- Environments
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Received:January 13, 2022  Revised:January 28, 2022
Key words: corrosion mechanism  N10276 alloy  long-term aging  H2S
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wangxinchao,wangyan,houlifeng,zhangshaohua,liubaosheng and weiyinghui  
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      The corrosion mechanism of the N10276 alloy before and after long-term aging treatment in aqueous solutions containing CO2/Cl- and CO2/H2S/Cl- was studied through the electrochemical impedance plots and cyclic potentiodynamic polarization. Results reveal that a not-well-defined capacitive loop appears in the low-frequency range and it changes into Warburg's impedance as the H2S concentration increases (10~100 μL/L) due to the large quantities of H2S-related adsorbed species in the film. In addition, H2S concentration plays a key role in increasing corrosion rate. In comparison, the action of long-term aging is more significant on pitting corrosion. The surrounding sites of the precipitates become the preferred corrosion area since the austenite microstructure of long-term aged N10276 alloy includes lots of precipitated second phases (μ phase with accumulation of Mo and Ni elements), leading to the occurrence of pitting defects.