Flow Assisted Corrosion

Schmitt, H. G.; Bakalli, Mirdash

doi:10.1016/b978-044452787-5.00039-1

Cited by 21 publications

(24 citation statements)

References 24 publications

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“…Flow can enhance uniform corrosion or initiate and propagate localized corrosion. Corrosion that is associated with or affected by fluid flow is often called flow-dependent corrosion, which can be classified into erosion-corrosion and flow-accelerated corrosion in single phase liquid flow [8,20]. The corrosion of low carbon steel in uninhibited 4 M hydrochloric acid at elevated temperature is generally under activation control due to the high diffusivity of the hydrogen ion and flow velocity has no noticeable effect on the corrosion rate [21].…”

Section: Introductionmentioning

confidence: 99%

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Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

2016

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Section: Introductionmentioning

confidence: 99%

“…and pitting corrosion of metal coupons in laboratory experiments as well as in tubular metal samples under oilfield conditions [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

2016

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“…In addition, they defined the critical wall shear stresses for FILC initiation related to the fracture stress of protective scales with the parameter K SAC accounting for the effect of surface active compounds (SACs) present in the system. In order to understand corrosion mechanism, a new approach is presented by Schmitt et al [24,25] which allows for the first time to quantify the maximum interaction forces between flowing media and the wall which appears to be well in the order of fracture stresses of protective films. The mechanism of the additive effect is not dominated by surface adsorption effects, but based on interactions of supramolecular aggregates with near-wall microturbulences influencing the near-wall fluid dynamics significantly.…”

Section: The Forming-and Damage Mechanismsmentioning

confidence: 99%

Scaling characteristics and growth of corrosion product films in turbulent flow solution containing saturated CO₂

Yin

Zhao

Feng

et al. 2009

Materials & Corrosion

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In the present study, the surface and cross-section microstructures of the corrosion films were investigated by SEM and the corrosion rate was measured by mass loss at the various conditions associated with the main influencing factors such as temperature, CO 2 partial pressure, and flow velocity. The results indicated that the three factors have obvious characteristics and the enhanced interactions among the main influencing factors intensively influence the formation and growth of corrosion film. In addition, there were two corrosion mechanisms connected with the forming film and damaging film. A new lattice model was proposed to describe the general aspects concerning the formation of the corrosion film at the metal surface/solution interfaces.

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“…While the wall shear stress τ w (Pa) has been clearly defined (Equation (18)) and measured for a long time, the hydrodynamic energy density E D (Pa) has been defined only recently 15, 16 during investigations aiming at identifying the interaction energy of single near‐wall turbulence elements via microelectrochemical flow measurements.…”

Section: Flow Effects At Scale‐covered Surfacesmentioning

confidence: 99%

Advanced models for erosion corrosion and its mitigation

Schmitt

Bakalli

2008

Materials & Corrosion

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Erosion corrosion, i.e., flow-induced localized corrosion (FILC) is initiated when flow dynamic forces surpass the fracture energy of protective layers or scales on metals. With a new model the maximum interaction energies between flowing media and solid walls can be quantified in terms of ''freak'' energy densities created during singular events (freak events) of perpendicular impacts by near-wall microturbulence elements. The freak energy densities are in the megaPascal range and match well in the order of magnitude with fracture energies of protective layers and can be estimated from Wavelet diagnostics of electrochemical current noise measured at microelectrodes under mass transport controlled conditions. This solves the problem that wall shear stresses, generally used to quantify critical flow intensities for FILC initiation, range several orders of magnitude (Pa range) below the fracture energies of protective layers. The new advanced model allows for the first time to quantify the maximum fluid dynamic forces exerted on solid walls under different turbulent and disturbed flow conditions (onephase liquid flow on jet impinged surfaces and on coupons in rotated cages, surfaces impacted by slug flow and gas-pulsed impinging jets). Drag reducing additives were shown to reduce freak energy densities to values significantly below fracture energies of protective layers and hence inhibit initiation of FILC. The onset of FILC can be monitored online with the newly developed CoulCount method, an easy-to-use, non-invasive diagnostic tool which evaluates electrochemical current noise between jet impinged electrode pairs made from the metals to be tested.

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Flow Assisted Corrosion

Cited by 21 publications

References 24 publications

Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

Scaling characteristics and growth of corrosion product films in turbulent flow solution containing saturated CO₂

Advanced models for erosion corrosion and its mitigation

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Flow Assisted Corrosion

Cited by 21 publications

References 24 publications

Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

Effect of surface roughness on corrosion behaviour of low carbon steel in inhibited 4 M hydrochloric acid under laminar and turbulent flow conditions

Scaling characteristics and growth of corrosion product films in turbulent flow solution containing saturated CO2

Advanced models for erosion corrosion and its mitigation

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Product

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Scaling characteristics and growth of corrosion product films in turbulent flow solution containing saturated CO₂