Abstract
Erosion-corrosion behavior of piping systems is a critical issue for their durability. This work concerns the erosion-corrosion behavior of carbon steel as a function of abradant characteristics as particle size and concentration. Degradation tests were performed in a jet erosion-corrosion cell with a maximum flow rate of 4.8 m/s, and jet angles comprised 30° and 90°. Abradant particles consisted of angular alumina powder with a mean diameter of 181, 219, and 359 µm. A critical threshold flow velocity of about 2.5 m/s was determined when experiments were performed with particles with diameters of 181 µm and jet angles of 45°. Even if erosion did not occur, the degradation rate increased compared with the stagnant condition because of dissolved dioxygen supply. A maximum of erosion-corrosion of 4 mg × cm−2 × h−1 was determined for the jet angle of 45°, irrespective of the particle sizes. The increase of abradant concentration led to a higher degradation rate regardless of the jet angle. However, the degradation rates tended to limit values of 7 mg × cm−2 × h−1 at 45° and 5 mg × cm−2 × h−1 at 90°. Above a critical concentration, a slowdown of the degradation was measured, suggesting that particle behavior in dense fluid acts on material degradation. This critical concentration can be understood from the interactions of the particles in concentrated media that modify trajectories in the flow and at the metal surface, reducing their kinetic energy consequently.
Highlights
Turbomachinery, short and long-distance pipelines, pumps, etc., are constitutive to fluid transportation structures
Because of the low degradation rate, degradations were not determined by 3D image analysis but by weighing
For SMB400 immersed in stagnant solution, the corrosion rate was around
Summary
Turbomachinery, short and long-distance pipelines, pumps, etc., are constitutive to fluid transportation structures. Because the fluids can contain hard particles, materials are submitted to abrasion, erosion, and corrosion. Slurry erosion and slurry erosion-corrosion behavior of materials depend on environmental and experimental conditions. For passive materials such as stainless steel, the synergistic effect between erosion and corrosion is expected since the passive is scratched by the particles and rebuilt shortly after [1]. The oxide film is less resistant, the mechanic usually dominates the matter loss, and the hardest phase is more effective in erosion resistance [2,3,4]. The material potential and the solution temperature can play a role in the transitions between erosion-corrosion regimes, as Stack et al [5] showed
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