Effect of temperature on anodic behavior of 13Cr martensitic steel in CO2 environment |
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Authors: | G X Zhao M Zheng X H Lv X H Dong H L Li |
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Affiliation: | (1) Department of Materials Science and Engineering, Xi'an Jiaotong University, 710049 Xi'an, P. R. China;(2) Tubular Goods Research Center of CNPC, 710065 Xi'an, P. R. China |
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Abstract: | The corrosion behavior of 13Cr martensitic stainless steel in a CO2 environment in a stimulated oilfield was studied with potentiodynamic polarization and the impedance spectra technique. The
results showed that the microstructure of the surface scale clearly changed with temperature. This decreased the sensitivity
of pitting corrosion and increased the tendency toward general (or uniform) corrosion. The capacitance, the charge transfer
resistance, and the polarization resistance of the corrosion product scale decrease with increasing temperature from 90 to
120 °C, and thus the corrosion is a thermal activation controlled process. Charge transfer through the scale is difficult
and the corrosion is controlled by a diffusion process at a temperature of 150 °C. Resistance charge transfer through the
corrosion product layer is higher than that in the passive film. |
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Keywords: | CO2 corrosion 13Cr martensitic stainless steel electrochemical impedance spectra |
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