The growth mechanism of CO2 corrosion product films

Gao, Ming; Pang, Xiaolu; Gao, Kewei

doi:10.1016/j.corsci.2010.09.060

Cited by 179 publications

(123 citation statements)

References 14 publications

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“…Figure 7 also shows that more FeCO 3 crystals deposit on the coupon surface and the gap between adjacent FeCO 3 crystals becomes smaller. Those gaps act as the diffusion channel of corrosive ions, and the corrosion rate (CR) is proportional to the porosity (e), which is described by Equation (5) [35] CR ¼ be À a ð5Þ…”

Section: Microscopic Surface Morphology Before Scales Removalmentioning

confidence: 99%

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions

Liu

Gao

et al. 2016

Materials & Corrosion

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Immersion experiment was carried out to investigate the CO 2 corrosion behavior of low-alloy steel used for pipeline at vapor-saturated CO 2 and CO 2 -saturated brine conditions by revealing microstructure, corrosion rate, corrosion phases, surface/cross-section morphology, and elements distribution. The results demonstrate that mass losses at both conditions are approximately linear to corrosion time with log scale, and the corrosion rate at vaporsaturated CO 2 condition is greatly lower than that at CO 2 -saturated brine condition. The main corrosion phases consisting of inner layer and outer layer are Cr-rich compounds and FeCO 3 crystals, respectively. Corrosion products on the coupon surface produced at vapor-saturated CO 2 condition are formed locally, while the ones produced at CO 2 -saturated brine condition deposit on the coupons surface homogeneously. That distinction is caused by the difference of formation process of corrosive solution. According to the experimental results, corrosion mechanisms of low-alloy steel at both conditions are discussed to illustrate CO 2 corrosion behavior.

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Section: Microscopic Surface Morphology Before Scales Removalmentioning

confidence: 99%

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions

Liu

Gao

et al. 2016

Materials & Corrosion

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“…However, in the literature porosity values of 0.001 to 0.5 are observed for siderite CPL. 41 In this section, porosity values of 0.2, 10 −1 and 10 −2 are used. The decrease of the porosity leads to the increase of the conductive surface area (see Equation 5c) and consequently of the cathodic contribution within the CPL.…”

Section: Resultsmentioning

confidence: 99%

One-Dimensional Porous Electrode Model for Predicting the Corrosion Rate under a Conductive Corrosion Product Layer

Mohamed-Saïd

Vuillemin

Oltra

et al. 2017

J. Electrochem. Soc.

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General corrosion is the main form of corrosion likely to affect carbon steels in an anoxic and near neutral environment such as encountered in the context of long term storage of steel canisters in a deep geological repository. This paper aims at studying the influence of the electrical and geometrical properties of a siderite corrosion product layers (CPL) formed in such conditions on its stability and on its subsequent protective properties against corrosion. A 1-D numerical model describing general corrosion under a porous conductive CPL and accounting for chemical evolution in the electrolyte is presented. It is demonstrated that a conductive layer with a cathodic activity increases the corrosion rate and the Fe 2+ ions concentration. Otherwise, a conductive layer leads to high saturation levels of siderite and high pH values within the CPL and consequently to a stabilization of the CPL. It is shown also that the stability of the CPL is promoted when it is initially thick and/or when it has a low porosity. In the context of geological disposal of High Level radioactive Waste (HLW) over several thousand years it is necessary to predict long term corrosion of the metals in contact with liquid or solid phases present in the geological environment. In France, these HLW would be stored in a near neutral deep Callovo-Oxfordian (Cox) argillite, and low alloyed steel will be used for most of the metal components (overpack, liner) in contact with this environment. 1In this context, different corrosion steps are expected: a dry corrosion step during operated phase, a step of aqueous corrosion under oxidizing conditions (oxygen reduction) and a step of aqueous corrosion under anoxic conditions. This latter step, much longer than the first ones, is considered in our research. During this phase, in the absence of passivation, the main form of corrosion likely to affect carbon steels is general corrosion leading to the formation of a thick corrosion products layer (CPL) mainly composed of siderite (FeC O 3 ) in an argilleous environment.2 Then, predicting corrosion evolution of steel components in contact with the Cox environment necessitates to account for the role and properties of this siderite CPL. It must be emphasized that the formation of siderite CPL have been considered in some numerical models to predict the evolution of general corrosion occurring on carbon steel in acidic (C O 2 and/or H 2 S) environments in the petroleum context, using either an empirical / semi-empirical approach 3-5 or mechanistic models. 6-10In a near neutral environment in the field of HLW repository, semi-empirical models based on experiments, 11,12 and mechanistic models [13][14][15][16][17] have also been developed to predict the evolution of the corrosion rate of carbon steel.Furthermore, the role of the CPL has been highlighted and implemented in their models by other authors. [18][19][20][21][22] However, the electrical properties of the CPL were not implemented. The CPL was only considered as an additional diffusive barrier. For i...

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“…Gao et al 5,6,24 reported that the corrosion product film consisted of cubic crystals provided good corrosion resistance for the steel substrate against CO 2 corrosion. Zhu et al 4 also reported that the cubic structure could effectively resist the diffusion/permeation of aggressive species reaching the film/substrate interface.…”

Section: Surface Microstructurementioning

confidence: 99%

“…5,6 Because of the different temperature susceptibility between the precipitation process and the undermining process, at low temperature, the undermining rate was usually faster than the precipitation rate, resulting in that the undermining process controlled the film-formed kinetics on the surface of carbon steels. 17,18 In this case, a porous, poorly adherent and non-protective film would be obtained on the steel surface, and the film was almost no diffusion/permeation resistance to restrain the cathodic species, such as H + , H 2 O and H 2 CO 3 , reaching the film/substrate interface.…”

Section: Film Compositionmentioning

confidence: 99%

“…[1][2][3] At present, studies involving CO 2 corrosion for carbon steels are mainly focused on CO 2 saturated brine in order to simulate actual CO 2 corrosion environments, and the corrosion behavior of carbon steels is mainly dependent on the following factors: temperature, CO 2 partial pressure, aggressive or inhibitive species, pH and flow rate. [4][5][6][7][8][9] Zhu et al 4 studied the corrosion behavior of the N80 carbon steel in oil field formation water containing CO 2 and reported that the temperature variation played a critical role in the corrosion rate of the N80 steel. The film on the N80 steel surface was mainly composed of iron carbonate (FeCO 3 ).…”

Section: Introductionmentioning

confidence: 99%

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The Structure and Composition of Corrosion Product Film and its Relation to Corrosion Rate for Carbon Steels in CO2 Saturated Solutions at Different Temperatures

Zhou

Zhang

Zuo

et al. 2017

J. Braz. Chem. Soc.

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For carbon steels immersed in CO 2 saturated solutions at different temperatures, the structure and the composition of corrosion product film formed on the steel surface were studied by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The corrosion rate of the steel was evaluated by potentiodynamic polarization, and the relation between the corrosion rate and the film property was discussed. The corrosion rate of the steel was very closely associated with the structure and the composition of corrosion product film, which were affected significantly by the solution temperature. From 30 to 60 °C, the corrosion product film composed of FeCO 3 was porous and poorly adherent, and the corrosion rate increased with the rise of temperature. At 70 and 80 °C, the corrosion product film was also composed of FeCO 3 and presented a compact and dense cubic crystal structure, resulting in the decrease on the corrosion rate. The corrosion rate increased once again when the temperature was up to 90 °C, which was attributed to the negative effect of high temperature water vapor corrosion on the grain coarsening and the part exfoliation for the FeCO 3 film.

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The growth mechanism of CO2 corrosion product films

Cited by 179 publications

References 14 publications

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions

One-Dimensional Porous Electrode Model for Predicting the Corrosion Rate under a Conductive Corrosion Product Layer

The Structure and Composition of Corrosion Product Film and its Relation to Corrosion Rate for Carbon Steels in CO2 Saturated Solutions at Different Temperatures

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The growth mechanism of CO2 corrosion product films

Cited by 179 publications

References 14 publications

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO2 and CO2‐saturated brine conditions

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO2 and CO2‐saturated brine conditions

One-Dimensional Porous Electrode Model for Predicting the Corrosion Rate under a Conductive Corrosion Product Layer

The Structure and Composition of Corrosion Product Film and its Relation to Corrosion Rate for Carbon Steels in CO2 Saturated Solutions at Different Temperatures

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Product

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Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions

Corrosion behavior of low‐alloy steel used for pipeline at vapor‐saturated CO₂ and CO₂‐saturated brine conditions