10379 Internal Co2 Corrosion of Mild Steel Pipelines Under Inert Solid Deposits

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Product Number: 51300-10379-SG

ISBN: 10379 2010 CP

Author: Jin Huang, Bruce Brown, Xiu Jiang, Brian Kinsella and Srdjan Nesic

Publication Date: 2010

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Under-deposit CO₂ corrosion occurs when solids like sand, corrosion products, wax or a variety of other particles deposit on the bottom of pipelines, forming a bed or layer of solids. Underdeposit CO₂ corrosion is different from “regular” CO₂ corrosion as the aqueous solution beneath the solids is chemically and physically different from the “bulk” solution in the pipe. The presence of solids can also limit inhibitor access to the metal surface which can initiate severe localized corrosion.

Initial testing was directed towards defining and modeling the fundamental mild steel CO₂ corrosion mechanisms occurring in the presence of clean inert solid deposits with different particle sizes and shapes (SiO₂ powder, glass beads (GB) and sand). Experiments were conducted in a glass cell at a total pressure of 1 bar for temperatures of 25°C and 80°C. The mild steel sample was immersed in 1 wt% NaCl electrolyte for one day. Corrosion behavior was characterized by electrochemical techniques, including LPR (linear polarization resistance), EIS (electrochemical impedance spectroscopy) and potentiodynamic sweeps. Steel surface morphologies have been analyzed by using SEM (scanning electron microscope) and EDX (energy dispersive x-ray). Keywords: solids, under-deposit, CO₂ corrosion, mild steel, pipelines