Microstructure and corrosion behavior of Fe-based amorphous composite coatings developed by atmospheric plasma spraying

Bijalwan, Pavan; Kumar, Adesh; Nayak, Sapan K.; Banerjee, Archi; Dutta, Moumita; Laha, Tapas

doi:10.1016/j.jallcom.2019.05.046

Cited by 43 publications

(23 citation statements)

References 34 publications

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“…5. As it is reported, beyond a critical velocity and temperature, the molten metallic particles with low viscosity tend to form splashed and fragmented splats, which can lead to formation of globular pores 30 , which is expected to be the case for sample No. 5.…”

Section: Resultsmentioning

confidence: 68%

“…However, increase in the extent of crystalline phases was observed by increasing the flow rate and the plasma power. This can be attributed to the different www.nature.com/scientificreports/ factors such as, high heat input, the degree of powder melting, the extent of oxidation and heat accumulation in the coatings during the plasma spraying process 30 . Figure 2b, shows the XRD profiles of KOH activated electrodes.…”

Section: Resultsmentioning

confidence: 99%

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Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Razmjooei

Liu

Azevedo

et al. 2020

Sci Rep

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Rationally designed free-standing and binder-free Raney-type nickel-molybdenum (ni-Mo) electrodes produced via atmospheric plasma spraying (APS) are developed by correlating APS process parameters with the microstructure of electrodes and their electrochemical performance in alkaline media. the results revealed that the electrode morphology and elemental composition are highly affected by the plasma parameters during the electrode fabrication. It is found that increasing plasma gas flow rate and input plasma power resulted in higher in-flight particle velocities and shorter dwell time, which in result delivered electrodes with much finer structure exhibiting homogeneous distribution of phases, larger quantity of micro pores and suitable content of Ni and Mo. Tafel slope of electrodes decreased with increasing the in-flight particles velocities from 71 to 33 mV dec −1 in 30 wt.% KOH. However, beyond a critical threshold in-flight velocity and temperature of particles, electrodes started to exhibit larger globular pores and consequently reduced catalytic performance and higher Tafel slop of 36 mV dec −1 in 30 wt.% KOH. Despite slightly lower electrochemical performance, the electrodes produced with highest plasma gas flow and energy showed most inter-particle bonded structure as well as highest stability with no measurable degradation over 47 days in operation as HER electrode in 30 wt.% KOH. The Raney-type Ni-Mo electrode fabricated at highest plasma gas flow rate and input plasma power has been tested as HER electrode in alkaline water electrolyzer, which delivered high current densities of 0.72 and 2 A cm −2 at 1.8 and 2.2 V, respectively, representing a novel prime example of HER electrode, which can synergistically catalyze the HER in alkaline electrolyzer. This study shows that sluggish alkaline HER can be circumvented by rational electrode composition and interface engineering. Hydrogen has attracted a lot of attention as a clean energy carrier, due to growing pressure on emissions and depleting reserves of fossil fuel. Alkaline water electrolysis (AWE) is one of the most mature and widely used electrolysis technologies for hydrogen production due to the inexpensive non-precious metal electrodes, low cost components and high durability 1-4. However, AWE operate at significantly lower current densities compared to proton exchange membrane water electrolysis (PEMWE). This can be due to this reason that not only the oxygen

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Razmjooei

Liu

Azevedo

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Due to the existence of potential difference between carbides and matrix, electric couple can be formed between The proportion of each phase in the microstructure plays an important role in the corrosion behavior of multiphase materials. 30) Thus, the change of volume fraction of each phase in the welding overlays inevitably affects its corrosion resistance. Eutectic carbides can separate the matrix and have more boundaries than primary carbides.…”

Section: Resultsmentioning

confidence: 99%

Acidic Corrosion Behavior of Slag-free Self-shielded Flux-cored Arc Welding Overlay

et al. 2022

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The corrosion resistance of slag-free self-shielded flux-cored welding overlays with different ferrotitanium (Fe-Ti) additions in 3.5 wt.% NaCl + 0.01 mol/L HCl acidic solution was investigated. The corrosion occurs in the matrix rather than M 7 (C, B) 3 , M 3 (C, B) and TiC in the microstructure of all the welding overlays. The corrosion resistance of hypereutectic welding overlay is decreased when the Fe-Ti addition is increased from 0 wt.% to 12 wt.%. The corrosion resistance of the welding overlay is the lowest since the overlay is a eutectic structure at the Fe-Ti addition of 12 wt.%. The eutectic structure increases the interface of corrosion reaction, which accelerates the corrosion rate and increases the corrosion current. With the Fe-Ti addition increasing from 12 wt.% to 24 wt.%, the corrosion resistance of the welding overlays with hypoeutectic structure is gradually increased, owing to the increase of the proportion of TiC and chromium content in the matrix.

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“…On this basis, the researchers explored the effect of process parameters on the hardness of the amorphous coating. Bijalwan et al 68 prepared Fe-based amorphous nanocrystalline composite coatings by atmospheric plasma spraying. The study found that the spraying power increased from 18 to 35 kW; the hardness increased from 10.51 GPa to 11.88 GPa.…”

Section: Hardnessmentioning

confidence: 99%

Research Progress and Development Trend of Amorphous and Nanocrystalline Composite Coatings: A Review

Zhang¹,

Yuan

Jing³

et al. 2022

JOM

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Compared with crystal alloy, amorphous alloy features atomic arrangement of long-range disorder and near-range order; it has no crystal boundary, dislocation and other defects that can easily promote corrosion initiation and development. With good mechanical properties, wear resistance and corrosion resistance properties, today amorphous alloys have become a research hotspot worldwide. However, the amorphous formation ability is limited, which restricts large-scale preparation, popularization and application of three-dimensional block materials. Due to the technical characteristics of rapid solidification, laser cladding technology and spraying technology are beneficial to the efficient preparation and transformation of amorphous alloy in the form of coating materials. According to the current research progress of amorphous and nanocrystalline composite coatings, this article introduces the typical amorphous and nanocrystalline composite coating alloy systems, summarizes the research progress of preparing amorphous and nanocrystalline composite coatings and expounds the research situation of the main mechanical properties, wear resistance and corrosion resistance of amorphous and nanocrystalline composite coatings. Finally, the application scope of amorphous and nanocrystalline composite coatings is reviewed, and the current problems and future development trends in the study of amorphous and nanocrystalline composite coating are indicated.Zhibin Zhang and Jiachi Yuan have contributed equally to this work.

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Microstructure and corrosion behavior of Fe-based amorphous composite coatings developed by atmospheric plasma spraying

Cited by 43 publications

References 34 publications

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Acidic Corrosion Behavior of Slag-free Self-shielded Flux-cored Arc Welding Overlay

Research Progress and Development Trend of Amorphous and Nanocrystalline Composite Coatings: A Review

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