A practical method for determining pit depths using X-ray attenuation in EDX spectra

Avci, Recep; Davis, Bret H.; Wolfenden, Mark L.; Kellerman, Laura; Lucas, Kilean; Martin, Joshua; Deliorman, Muhammedin

doi:10.1016/j.corsci.2014.12.018

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…[4].A broken MnS stringer, something that was commonly observed, is seen in the inset inFigure 11. When the immediate surroundings of a MnS stringer were corroded and etched away, a great amount of stress was released by the loss of ferrite matrix holding the stringer in place.…”

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confidence: 82%

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Role of Metallurgy in the Localized Corrosion of Carbon Steel

Avci¹,

Davis²,

Rieders³

et al. 2018

JMMCE

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Localized residual strain develops within the metallurgical texture of 1018 carbon steel from metallurgical processes, such as fabrication, annealing, and shaping. This residual strain results in accelerated localized pitting due to the formation of anodic sites at these locations. Once initiated, micron-sized corrosion pits can coalesce to form sites of potential catastrophic failure. In this contribution, we focus on the localized biocorrosion which initiates and grows in areas of localized strain such as the interfaces between manganese sulfide (MnS) inclusions and ferrite grains in the steel, at grain boundaries between ferrite grains with different crystallographic orientations and at pearlite grains (intergrown cementite (Fe 3 C) and ferrite), which are readily found in 1018 carbon steel. Here we hypothesize and show experimentally that accelerated biocorrosion in 1018 carbon steel finds its roots in the electrochemical potential difference (micro galvanic cells) generated between the unstrained ferrite iron (Fe α −) and the lattice defects, dislocations and mismatches found at interfaces formed between Fe α − and secondary phases i.e. MnS inclusions, cementite lamellar structures and grain boundaries distributed throughout the 3D network of the carbon steel. This hypothesis is supported by results from multiple micro-and nanoscale imaging and analytical methods obtained from field emission scanning electron microscopy, energy dispersive spectroscopy, electron backscattered diffraction and Auger nanoprobe electron spectroscopy. The morphology and composition of grains in the steel coupons were characterized before and after exposure to suboxic and sulfidogenic environments dominated by aerobic and anaerobic marine organisms. Corrosion processes are demonstrated to initiate in localized areas of high residual strain.

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confidence: 82%

“…When pits are generated around adjacent MnS inclusions, they grow as deep tunnels burrowing down below the surface and they grow in radius [3] [4]. If the distance between two inclusions is within this pit radius, they will connect and coalesce.…”

Section: Distribution Of Mns Inclusionsmentioning

confidence: 99%

Role of Metallurgy in the Localized Corrosion of Carbon Steel

Avci¹,

Davis²,

Rieders³

et al. 2018

JMMCE

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“…X‐ray attenuation length calculations were performed for each component of the FBE coating and the rebar based on Beer‐Lambert's law and are shown in Table S3. These calculations confirmed that the Fe Kα 1 fluorescence signal would be detected through the FBE coating, which had a thickness of 214 μm and a reported density of 1.2 g/cm 3 .…”

Section: Methodsmentioning

confidence: 99%

A spectromicroscopy study of the corrosion of fusion‐bonded epoxy–coated rebar

Situm

Guo

et al. 2019

Surface & Interface Analysis

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Funding information Natural Sciences and Engineering Research Council of CanadaReported herein is an analysis of accelerated corrosion of a commercially coated fusion-bonded epoxy rebar sample using an X-ray spectromicroscopy methodology that involves the combination of X-ray fluorescence mapping (XRF) and micro X-ray absorption near-edge spectroscopy (μ-XANES). XRF maps collected using an excitation energy of 7115 eV reveal a sharp contrast between corroded and noncorroded sample areas after correction for topography effects that can be confirmed by Fe K-edge μ-XANES. This X-ray spectromicroscopy methodology allows for the study of corrosion through commercially prepared polymer-coated rebar coatings without any modification to the polymer film prior to analysis and is suitable for long-term testing of the corrosion of these materials under real-world conditions.

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