Effect of rare earth oxide nano-additives on the corrosion behavior of Fe-based hardfacing alloys in acid, near-neutral and alkaline 3.5  wt.% NaCl solutions

Gou, Junfeng; Wang, You; Li, Xuewei; Zhou, Feifei

doi:10.1016/j.apsusc.2017.06.203

Cited by 17 publications

(3 citation statements)

References 36 publications

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“…For anticorrosion applications, coatings should prevent or at least mitigate moisture transfer between the metal and the surroundings, and the WVTR should be as low as possible. The following are the typical corrosion reactions of iron metal in Equations (3)- (6) [41,42]:…”

Section: Barrier Properties Of Pi Nanocomposite Filmsmentioning

confidence: 99%

Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

Lai¹,

Huang²,

Tseng³

et al. 2019

Express Polym. Lett.

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In this study, a novel alumina-covered graphene oxide/polyimide (AlGO/PI) nanocomposite was developed as an anticorrosion coating material. The hydroxyl groups on GO reacted with aluminum isopropoxide via a sol-gel process to yield AlGO nanosheets. The characterization and structure were confirmed by Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and field emission transmission electron microscopy. Subsequently, GO and AlGO were incorporated into a PI matrix, leading to the formation of GO/PI and AlGO/PI nanocomposites. Well-dispersed AlGO nanosheets in the PI matrix acted as effective additives to enhance the water barrier properties of GO/PI (58 g/(m 2 •day)) and AlGO/PI (43 g/(m 2 •day)) coatings. Most importantly, the resultant AlGO/PI films exhibited excellent optical transparency (>75%) and anticorrosion properties. Electrochemical measurements of corrosion potential, polarization resistance, and corrosion current as well as electrochemical impedance spectroscopy confirmed that the AlGO/PI nanocomposites exhibited better anticorrosion properties than GO/PI nanocomposites. This is likely because the insulating layer of alumina on GO can isolate the charge transfer pathway between GO and the metal substrates, leading to improved anticorrosion behavior.

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Section: Barrier Properties Of Pi Nanocomposite Filmsmentioning

confidence: 99%

Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

Lai¹,

Huang²,

Tseng³

et al. 2019

Express Polym. Lett.

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show abstract

“…Theoretically, it is still challenging to design alloys with high corrosion resistance and conductivity because BPs work in a complex harsh solution, and the corrosion behaviors might be affected by the viscosity, conductivity, temperature, and concentration of ions. For instance, Gou et al found that the corrosion resistance of Fe-based alloys could be further improved in NaCl solution through adding the rare earth oxide to increase the viscosity of the solution. Rodrigues et al reported that Al possessed the lowest I corr of 1.59 × 10 –7 A cm –2 in neutral NaCl solution rather than in acid and alkaline solutions and the antierosion of Al could be improved through adding tannin in the solutions.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Screening of Transition Metal Alloys with High Corrosion Resistance: The Case of Ta-Based Alloys as an Example

Lv,

Gao,

Luo

et al. 2024

J. Phys. Chem. C

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Proton exchange membrane water electrolysis (PEMWE) is one of the potential strategies to generate green hydrogen energy, and anticorrosive coatings are mandatory to protect the bipolar plates, an important component of PEMWE. However, it is still challenging to explore the high-corrosion-resistance coatings by trial and error. In this paper, the corrosion properties of Ta and its alloys as examples are studied theoretically; in particular, the influences of crystal planes and alloying elements on the corrosion resistance have been studied systematically. Four descriptors, surface energy density ξ, work function τ, electronic descriptor ψ, and d band center ς, are proposed to screen the high-corrosion-resistance coatings. It is found that the electronic descriptor ψ can well predict the atomic escape energy and thus the corrosion resistance of Ta-based binary alloys with the coefficient of determination R 2 of 0.804 and 0.949, respectively. Among them, TaW and TaCr alloys exhibit the most excellent corrosion resistance with the lowest I corr (<1.59 × 10 −7 A cm −2 ) and the highest U corr (> −0.011 V vs SHE) because of the largest −IpCOHP values and thus the strongest binding strength. The screening method is also applicable to the other alloys.

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“…The change in volume fraction of the primary and eutectic carbides and refinement of primary carbide influenced the corrosion behavior of the hardfacing alloys [12]. it was demonstrated that the austenitic structured materials (for stainless steels and white cast irons) suffered lower overall material loss compared with the martensitic structured materials in the acidic conditions [13].…”

Section: Introductionmentioning

confidence: 99%

Acidic Corrosion Behaviour of Niobium-Added Welding Overlays Fabricated by Self-Shielded Metal-Cored Wires

Liu,

Wu,

Long

et al. 2023

Archives of Metallurgy and Materials

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Acidic corrosion BehAviour of nioBium-Added Welding overlAys fABricAted By self-shielded metAl-cored WiresBoth corrosion and abrasion remove materials from some engineering components such as impact coal crusher hammers, pulverizer rings, chute liner, and rolls or molds. intensive research has been done on improving the wear resistance of high chromium alloys, however, studies into corrosion resistance of high chromium alloys are insufficient. in order to determine the amount of ferroniobium addition in the wire to achieve the best corrosion resistance, and find out the mechanism of ferroniobium enhancing the corrosion resistance of the welding overlays, the high-cr iron-based welding overlays with different niobium addition were fabricated by using self-made self-shielded metal-cored wires and their acidic corrosion resistance in 3.5 wt.% nacl solution + 0.01 mol/L hcl solution were investigated by electrochemical corrosion test. The microstructure and corrosion morphology were characterized by om, sem, XRD and eDs. The polarization curves and values of I corr , E corr and R c indicate the corrosion resistance is at the highest with 3.6 wt.% niobium addition, and at the lowest when the niobium addition is 10.8 wt.%. The corrosion of welding overlay occurs in the matrix of microstructure. With the increase of niobium addition from 3.6 wt.% to 10.8 wt.%, the proportion of network eutectic structure in the welding overlay is increased. up to 10.8 wt.%, the microstructure is transformed from hypereutectic structure into eutectic one, leading to a higher acceleration of corrosion rate. When niobium addition reaches 14.4 wt.%, the welding overlay is transformed into a hypoeutectic structure. The addition of niobium element consumes carbon element in the alloy, which makes the increase of chromium content in the final solidified matrix, leading to an improvement in corrosion resistance.

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Effect of rare earth oxide nano-additives on the corrosion behavior of Fe-based hardfacing alloys in acid, near-neutral and alkaline 3.5 wt.% NaCl solutions

Cited by 17 publications

References 36 publications

Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

Theoretical Screening of Transition Metal Alloys with High Corrosion Resistance: The Case of Ta-Based Alloys as an Example

Acidic Corrosion Behaviour of Niobium-Added Welding Overlays Fabricated by Self-Shielded Metal-Cored Wires

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