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| STRESS CORROSION CRACKING OF P110 IN ENVIRONMENT OF HIGH CONTENTS OF H2S AND CO2 |
| CUI Shihua, LI Chunfu, WANG Pengfei, DENG Hongda |
| State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500 |
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Abstract The constant load tensile test, with combination of electrochemical corrosion technology and SEM analysis method, were performed to study sulfide stress corrosion cracking (SSCC) of P110 steel in H2S/CO2 NACE standard solution. The results show that, with the increase H2S content, the corrosion Ecorr of P110 steel dropped sharply and increaseed slowly again after reaching minimum point. Then the corrosion Ecorr increased to constant point about five hours until fracture phenomenon occurring, and the sample appear brittle cleavage fracture. With the content of CO2 increasing in the solution, the Ecorr potentials of steel P110 increased, the corrosion current decreased, the time of fracture extended and the brittle cleavage fracture transformed to toughness dimples. The generation of this phenomenon has the relevant combination of competitive adsorption of H2S/CO2 in steel surface and tensile breakdown and regeneration of P110 surface membrance in stress corrosion environmental.
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Received: 24 November 2008
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Corresponding Authors:
LI Chunfu
E-mail: Lichunfulo@163.com
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