Insight into atmospheric pitting corrosion of carbon steel via a dual-beam FIB/SEM system associated with high-resolution TEM

Wan, Ye; Tan, Jun; Zhu, Siteng; Cui, Jingping; Zhang, Ke; Wang, Xiumei; Shen, Xuanyu; Li, Yanbo; Zhu, Xiangwei

doi:10.1016/j.corsci.2019.03.017

Cited by 40 publications

(9 citation statements)

References 27 publications

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“…According to the qualitative categorization of carbon steel corrosion rates for oil production systems, any corrosion rate above 0.38 mm/y is considered severe pitting corrosion, a catastrophic localized steel failure that produces severe global economic losses [ 56 ]. Moreover, any corrosion rate below 0.025 mm/y is considered low general corrosion [ 30 ], where general corrosion or rusting is considered a uniform corrosion process, in which micro corrosion cells are activated at the corroded area.…”

Section: Resultsmentioning

confidence: 99%

External Corrosion Behavior of Steel/GFRP Composite Pipes in Harsh Conditions

2021

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In this study, we report on the corrosion behavior of hybrid steel/glass fiber-reinforced polymer (GFRP) composite pipes under harsh corrosive conditions for prolonged durations. Specimens were immersed in highly concentrated solutions of hydrochloric acid, sodium chloride, and sulfuric acid for durations up to one year. Detailed qualitative analysis using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), and energy-dispersive X-ray spectroscopy (EDX) is presented. It is shown that the hybrid pipes have excellent corrosion resistance with a corrosion rate of less than 1% of the corrosion rate for conventional steel pipes. That low corrosion rate can be attributed to the formation of pores in the GFRP layer due to increased absorption and saturation moisture in the material with increased soaking time. This can be reduced or even prevented through a more controlled process for fabricating the protective layers. These promising results call for more utilization of GFRP protective layers in novel design concepts to control corrosion.

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Section: Resultsmentioning

confidence: 99%

External Corrosion Behavior of Steel/GFRP Composite Pipes in Harsh Conditions

2021

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“…Although difficulties remain in studying the pitting corrosion of aluminum alloys, [33] previous research has attempted to reveal the possible reason for this phenomenon. Due to electrostatic attraction during pitting corrosion, anions such as Clare migrated into the pit bottom [34] and then concealed beneath the corrosion films, which makes Cl and S undetectable by the surface EDS method.…”

Section: Discussionmentioning

confidence: 99%

“…[37,38] Eventually, a large corrosion pit is formed and the anions built up at the bottom of the corrosion pit. [34] It is well known that Al 3+ is prone to hydrolysis reaction (Reaction (2) and ( 3)) in aqueous solutions [39] and thus forming the hydrolysate Al (OH) 3 , which has been ascertained by the XRD results in Figure 9.…”

Section: Discussionmentioning

confidence: 99%

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Pitting corrosion behavior and mechanism of 5083 aluminum alloy based on dry‐wet cycle exposure

Wan

Jin

et al. 2022

Materials & Corrosion

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Electrochemical and surface analysis methods were used to investigate the pitting susceptibility and propagation of as-received and dry-wet cycle exposed 5083 aluminum alloy (AA5083) specimens. We find that dry-wet cycle exposure can reduce the corrosion potential, while increasing the corrosion current density, pitting potential (E p ), and passivation range. The pitting corrosion behavior during the dry-wet cycle process depends on the exposure temperature and time. Increased exposure temperature and time result in reduced pitting percentage and corrosion altitude and decreased microhardness of the corrosion products, which promotes the pitting sensitivity of AA5083. The underlying pitting mechanism is proposed by employing the morphology and microstructures of the corrosion products.

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“…Research on localized corrosion began at the macroscale (via electrochemical, weight loss, etc. ) , and has been extensively conducted at the microscale (e.g., via atomic force and scanning electron microscopy); − however, these surface analytical techniques lack the ability to probe processes in situ and at high resolution. Consequently, the ongoing challenge has been to find and observe corrosion initiation on the scale at which it occurs: the nanoscale. , …”

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Genesis of Nanogalvanic Corrosion Revealed in Pearlitic Steel

et al. 2022

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Nanoscale, localized corrosion underpins billions of dollars in damage and material costs each year; however, the processes responsible have remained elusive due to the complexity of studying degradative material behavior at nanoscale liquid−solid interfaces. Recent improvements to liquid cell scanning/transmission electron microscopy and associated techniques enable this first look at the nanogalvanic corrosion processes underlying this widespread damage. Nanogalvanic corrosion is observed to initiate at the near-surface ferrite/cementite phase interfaces that typify carbon steel. In minutes, the corrosion front delves deeper into the material, claiming a thin layer of ferrite around all exposed phase boundaries before progressing laterally, converting the ferrite to corrosion product normal to each buried cementite grain. Over the following few minutes, the corrosion product that lines each cementite grain undergoes a volumetric expansion, creating a lateral wedging force that mechanically ejects the cementite grains from their grooves and leaves behind percolation channels into the steel substructure.

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Insight into atmospheric pitting corrosion of carbon steel via a dual-beam FIB/SEM system associated with high-resolution TEM

Cited by 40 publications

References 27 publications

External Corrosion Behavior of Steel/GFRP Composite Pipes in Harsh Conditions

External Corrosion Behavior of Steel/GFRP Composite Pipes in Harsh Conditions

Pitting corrosion behavior and mechanism of 5083 aluminum alloy based on dry‐wet cycle exposure

Genesis of Nanogalvanic Corrosion Revealed in Pearlitic Steel

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