In Situ Raman Spectroscopic Analysis on Carbon Steel, Immersed in Aqueous Solutions at Different pH and Anions

Thinaharan, C.; George, R.P.; Philip, John

doi:10.1007/s11665-020-04805-x

Cited by 14 publications

(9 citation statements)

References 51 publications

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“…Further, the corrosion products formed on the surface were compact and identical to that of carbon steel specimen immersed in acidic sulphate solution. 35 Further, at extended exposure times of 60 and 120 h (Figs. 2e and 2f), intense brown coloured and thick corrosion deposits were uniformly formed on the surface.…”

Section: Resultsmentioning

confidence: 89%

“…Based on the in-situ LRS results on initial corrosion products, the underlying corrosion mechanism of the modified 9Cr-1Mo steel in different aqueous solutions is elucidated and the results are compared with that of carbon steel 35 to understand the role of alloying elements on corrosion of steel (Table II). In-situ LRS investigation on CS immersed in all the aqueous media revealed the formation of green rust (GR) at all corrosion initiation sites, which was later transformed to lepidocrocite and magnetite.…”

Section: Discussionmentioning

confidence: 99%

“…Further, an aqueous media can shield the corrosion products from phase transformation due to exposure to air/laser-induced heating. 12,35 This study is aimed at probing early corrosion of modified 9Cr-1Mo steel immersed in four different aqueous solutions of acidic sulphate, neutral chloride, fresh water and alkaline using in-situ LRS and the characterization of the surfaces by XPS. In-situ Raman spectra were acquired at different immersion times of 5, 20, 40, 60 and 120 h. The initial corrosion products, their stability and transformations on the surface of the modified 9Cr-1Mo steel are compared with that of carbon steel (CS) corrosion 35 under identical conditions to understand the role of alloying elements.…”

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confidence: 99%

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In-Situ Detection of Early Corrosion of Ferritic Cr-Mo Steel in Aqueous Solutions of different Anions using Laser Raman Spectroscopy

Thinaharan

George

Philip

2021

J. Electrochem. Soc.

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We report the early-stage corrosion of modified 9Cr-1Mo ferritic steel in aqueous environments at natural corroding conditions. Uniform, pitting, and crevice corrosion was observed in acidic sulphate, neutral chloride, and fresh water environments, respectively. In-situ laser Raman spectroscopy (LRS) studies revealed the formation of Fe3O4, γ−Fe2O3, γ−FeOOH phases, and stable heterogeneous corrosion products of γ−FeOOH and α−FeOOH in all media, except in an alkaline solution. A stable passive film, composed of oxide and oxy-hydroxides of chromium and iron, is formed in an alkaline solution. X-ray photoelectron spectroscopy (XPS) results confirm the presence of Cr and Fe oxide and oxy-hydroxides in all corrosion products and enrichment of Mn and Nb oxides on the corroded surface in neutral chloride solution, but only Mn oxy-hydroxide in acidic solution. Chloride ion in the corroded surface in neutral chloride solution indicates a chloride-induced corrosion attack. In-situ LRS, together with ex-situ XPS enabled the identification of all corrosion products formed on modified 9Cr-1Mo steel. The presence of laminar γ−FeOOH and acicular α−FeOOH phases are confirmed from the FESEM images. Our results indicate that except in alkaline solution, the corrosive ions deteriorate the integrity of native film on modified 9Cr-1Mo steel.

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Section: Resultsmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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In-Situ Detection of Early Corrosion of Ferritic Cr-Mo Steel in Aqueous Solutions of different Anions using Laser Raman Spectroscopy

Thinaharan

George

Philip

2021

J. Electrochem. Soc.

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“…Figure reveals the Raman plot of the MS/Ce-ZIF8 and MS/Ce samples. The sharpest peak at 667 cm –1 that is labeled on the MS/Ce plot belongs to the iron oxide . The corresponding peaks to cerium oxide have not appeared on the MS/Ce plot due to the low thickness of the cerium thin film.…”

Section: Resultsmentioning

confidence: 99%

“…The sharpest peak at 667 cm −1 that is labeled on the MS/Ce plot belongs to the iron oxide. 26 The corresponding peaks to cerium oxide have not appeared on the MS/Ce plot due to the low thickness of the cerium thin film. Looking at the Raman results of MS/Ce-ZIF8, the spectrum is dominated by the organic linker to show the peaks and the vibration of the imidazole molecules and methyl group reveals peaks in the range of 282−3136 cm −1 .…”

Section: Evaluation Of Thementioning

confidence: 99%

Enhancing Self-Healing and Adhesion Bonding Properties: Investigating the Promising Potential of Ce-ZIF8 MOF Hybrid Thin Films as pH-Responsive Nanocoatings

Falahaty marvast,

Gholambargani,

Ramezanzadeh

et al. 2023

Langmuir

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Further modification of the pre-treated steel surface with cerium conversion coating was performed using a novel porous coordination polymer (PCP) based on zeolitic imidazole framework-8 (ZIF8) in order to reduce the defect and disorders of the surface. The treated mild steels (MS) with Ce (MS/Ce) and Ce-ZIF8 (MS/Ce-ZIF8) were characterized by the GIXRD, Raman, and FT-IR, and via contact angle and FE-SEM, their surface features were investigated. The protection performance of the samples against corrosion was evaluated in the saline solution media using electrochemical impedance spectroscopy (EIS, in the long term) and polarization tests. The results evidenced that applying the ZIF8 nanoparticles onto the Ce-treated steel surface increased the total resistance value after 24 h of immersion (49.47%). Afterward, the ZIF8-modified coating (MS/Ce and MS/Ce-ZIF8) impact on the epoxy coating protection function was characterized by EIS (in the scratched form), salt spray (5 wt % salts), cathodic disbonding (at 25 °C), and pull-off tests. The EIS outcomes of the scratched coatings proved approximately a 51.29% increase in R t of the MS/Ce-ZIF8/EC sample compared with the MS/EC sample after 24 h of immersion. The cathodic disbonding test results after 24 h of exposure revealed that the delamination area of the coating decreased in the modified sample, and the delamination radius of the epoxy coating was about 4.78, 2.96, and 2.0 mm for the MS/EC, MS/Ce/EC, and MS/Ce-ZIF8/EC samples, respectively.

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The Combined Effect of Direct Current Polarization, Ultraviolet Radiation, and Saline Immersion on the Degradation of an Epoxy Coating

Song

Zheng

2023

J. of Materi Eng and Perform

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In Situ Raman Spectroscopic Analysis on Carbon Steel, Immersed in Aqueous Solutions at Different pH and Anions

Cited by 14 publications

References 51 publications

In-Situ Detection of Early Corrosion of Ferritic Cr-Mo Steel in Aqueous Solutions of different Anions using Laser Raman Spectroscopy

In-Situ Detection of Early Corrosion of Ferritic Cr-Mo Steel in Aqueous Solutions of different Anions using Laser Raman Spectroscopy

Enhancing Self-Healing and Adhesion Bonding Properties: Investigating the Promising Potential of Ce-ZIF8 MOF Hybrid Thin Films as pH-Responsive Nanocoatings

The Combined Effect of Direct Current Polarization, Ultraviolet Radiation, and Saline Immersion on the Degradation of an Epoxy Coating

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