Abstract
Abstract Corrosion tests were conducted on carbon steel (API 5L X70) and 13Cr steel (AISI 420) materials in a 3% NaCl solution containing sand particles (5000 to 9000 ppm) and saturated with CO2 at defined partial pressure (0 to 0.3 MPa) and temperature (30 to 60 C). The effect of residual O2 content (10 to 1500 ppb) was further examined. The following two flow geometries were studied: (1) undisturbed pipe flow and (2) submerged jet impinging (30 to 90 degrees) onto a flat plate. The effect of specimen surface treatment (shot blasting or pickling) was examined with dry-polished material as a reference. Weight loss and electrochemical measurements were applied to determine average and instantaneous corrosion rates respectively. The results are discussed relative to fluid flow conditions and the surface preparation/microstructure of the materials tested. No stable corrosion product layers retarding CO2 corrosion were formed within the testing time frame (<100 h). Consequently, no erosion-corrosion associate...
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