Effects of corrosion product deposit on the subsequent cathodic and anodic reactions of X-70 steel in near-neutral pH solution

Meng, Guozhe; Zhang, C.; Cheng, Y. Frank

doi:10.1016/j.corsci.2008.08.026

Cited by 124 publications

(55 citation statements)

References 18 publications

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“…The anodic and cathodic reactions during corrosion of X80 steel in the deoxygenated, near-neutral pH solution are the oxidation of iron and reduction of water, respectively [7,8,15,28]:…”

Section: Electrochemical Corrosion Mechanism Of X80 Steel In Near-neumentioning

confidence: 99%

“…In nearneutral pH environment, SCC occurring on low-grade steel pipelines, such as X52 and X70 steels, is usually attributed to a synergistic effect of hydrogen and stress on the local dissolution of steel at crack tip [6][7][8][9][10][11][12][13][14][15]. However, relevant study on the electrochemical corrosion and SCC behavior of high-strength pipeline steels has been very limited.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Xue¹,

Cheng²

2010

Materials & Corrosion

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In this work, the electrochemical corrosion behavior of X80 pipeline steel was investigated in a near-neutral pH solution using electrochemical impedance spectroscopy (EIC) and photo-electrochemical (PEC) measurements as well as X-ray photo-electron spectroscopy (XPS) technique. The effects of hydrogencharging and stress were considered. The results show that the steel is in an active dissolution state, and a layer of corrosion product is formed and deposited on the electrode surface, which is subjected to further oxidation to form ferric oxide and hydroxide. Photo-illumination enhances anodic dissolution of the steel when it is under anodic polarization due to destroying of the corrosion product film. When the steel is under cathodic polarization, the cathodic current density decreases upon laser illumination due to the photo-oxidation of hydrogen atoms generated during cathodic reactions, which behaves as an anodic reaction to offset the cathodic current density. Hydrogen-charging and stress decrease the corrosion resistance of the steel and enhance the dissolution rate of the steel.

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“…The anodic and cathodic reactions during corrosion of X80 steel in the deoxygenated, near-neutral pH solution are the oxidation of iron and reduction of water, respectively [7,8,15,28]:…”

Section: Electrochemical Corrosion Mechanism Of X80 Steel In Near-neumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Xue¹,

Cheng²

2010

Materials & Corrosion

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“…Redistribution subject to ECS terms of use (see 18.236.120. 13 Downloaded on 2018-05-11 to IP Figure 7. Time evolution of the integrated anodic/cathodic current (a) and corroded volume (b) for the three models: 1) no precipitation of corrosion product, 2) considering only the surface coverage effect of precipitated corrosion product, and 3) considering the steric hindrance effect of precipitated corrosion product in the whole electrolyte.…”

Section: Conductivity and Current Density Distribution In Electrolyte-mentioning

confidence: 99%

“…Since there was no source and sink for the current in the electrolyte, Gauss's law (Equation 13) was used to determine the current vector.…”

Section: Nomentioning

confidence: 99%

“…z E-mail: yjin@ustb.edu.cn the precipitated corrosion product has been found to also largely impact the activity of the metal surface. 12, 13 Payer et al 14 suggested that a corrosion product film capable of high ionic transport is required for the corrosion to continue. With sufficient electronic conductivity, the corrosion product can serve as cathode for subsequent metal corrosion and influence ion migration in the electrolyte.…”

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confidence: 99%

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Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Wang

Yin

Jin

et al. 2017

J. Electrochem. Soc.

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An improved finite element model was established to demonstrate the steric hindrance effect of the precipitated corrosion product (Al(OH) 3 ) on micro-galvanic corrosion triggered by intermetallic particles (IMPs) in an Al-matrix. In this model, the precipitation/ dissolution of the corrosion product could occur in the whole liquid field as the result of a reversible reaction. Simulation results show that the precipitated insulating Al(OH) 3 on the electrode surface can inhibit further corrosion by reducing the conductivity of the solution and the active electrode surface area. Meanwhile, the steric hindrance effect of the precipitated Al(OH) 3 also slows down the diffusion and migration of species in the solution. Moreover, considering the porous nature of precipitated Al(OH) 3 , a porosity parameter ε was introduced to describe the degree of compactness of corrosion product, which reaches a certain minimum value ε c under a specific corrosion situation. Compared to the previous work in which a surface coverage parameter was used to describe the blocking effect of Al(OH) 3 on surface activity, the present model is more realistic in mimicking the micro-galvanic corrosion, and also useful for the simulation of the transition from metastable pit formation to pit propagation. Al alloys are widely used in many fields as structural materials because of their high strength/weight ratio. Although many Al alloys show high corrosion resistance due to spontaneous formation of a protective oxide layer on the surface, some of them are vulnerable to local corrosion when exposed to aqueous solutions containing halide ions, e.g., Cl− . 1-3 Particularly, the surface heterogeneity may provide initiation sites for localized corrosion.4,5 A precise and comprehensive understanding of the localized corrosion behavior of Al alloys is of great importance.In our series of studies, 6,7 a FEM model has been established to investigate micro-galvanic corrosion induced by cathodic intermetallic particles (IMPs), i.e., trench formation, by taking into account electrochemical kinetics of the single phases involved, homogeneous reactions occurring in the electrolyte, a moving dissolution interface, as well as the precipitation of Al(OH) 3 on the electrode surface and blocking effect of the precipitated corrosion product. However, in the model reported previously, the precipitation was assumed to occur only on the electrode surface, and the blocking effect of the precipitated corrosion product was simply described by a surface coverage parameter (θ). In that case, the precipitation within the liquid phase and multi-dimensional growth of the precipitated corrosion product were not considered, and the steric hindrance on the mass transport was neglected. Such a simplification limits the applicability of the model for simulating practical systems, since the steric hindrance effect of the precipitated corrosion product has been widely recognized to be critical for the development of pitting-like localized corrosion.For instance, Frankel et al. 8,9 ...

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Understanding Pipeline Stress Corrosion Cracking

Cheng¹

2013

Stress Corrosion Cracking of Pipelines

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Effects of corrosion product deposit on the subsequent cathodic and anodic reactions of X-70 steel in near-neutral pH solution

Cited by 124 publications

References 18 publications

Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Steric Hindrance Effect of Corrosion Product

Understanding Pipeline Stress Corrosion Cracking

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