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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Comparison of the Rotating Cylinder and Pipe Flow Tests for Flow-Sensitive Carbon Dioxide Corrosion
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Comparison of the Rotating Cylinder and Pipe Flow Tests for Flow-Sensitive Carbon Dioxide Corrosion

机译：Comparison of the Rotating Cylinder and Pipe Flow Tests for Flow-Sensitive Carbon Dioxide Corrosion

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摘要

The effects of various hydrodynamic parameters on the corrosion rate of low-carbon steel in carbon dioxide (CO_2)environments were studied. Two different flow geometries, rotating cylinder (RC) and pipe flow, were studied simultaneously in the same electrolyte within a glass loop. Comparisons were made over a wide range of parameters: ire (T) = 20 deg C to 80 deg C, pH = 4 to 6, CO_2 partial pressure = 0 bar to 1 bar (0 kPa to 100 kPa), velocity s to 13 m/s. The hydrodynamic conditions studied range from static to highly turbulent flow. The process was monitored using polarization resistance, poentiodynamic sweep, and electrochemical e methods. The comparison of the two flow geometries was carried out in terms of hydrodynamics, mass and CO_2 corrosion. The measured mass transfer rates agreed well with published correlations for the RC and straight pipe (SP)flow. In the case of CO_2 corrosion, it was achieve good agreement between corrosion rates flow geometries at low temperatures by having the same water chemistry and mass-transfer conditions. This conclusion was valid for cases where no protective corrosion products, scale, or inhibitor films were present. However, at higher temperature , films with a certain degree of protectiveness were observed. In those cases, lower corrosion rates were obtained on the SP specimen because of more dense and protective films.

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