Pulsed laser remelting supersonic plasma sprayed Cr3C2-NiCr coatings for regulating microstructure, hardness and corrosion properties

Chong, Kai; Zou, Yong; Wu, Dongting; Tang, Yingwen; Zhang, Yongang

doi:10.1016/j.surfcoat.2021.127258

Cited by 30 publications

(4 citation statements)

References 38 publications

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“…4(c), (a) ,and (d). This distinguishes them from the group of coating materials obtained by other thermal spray methods (plasma or HVOF), where comparable mechanical properties were obtained ( Ref 30,31).…”

Section: Discussionmentioning

confidence: 88%

The Microstructure, Surface Topography and Wear Resistance of Cold-Sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) Composite Coatings Modified by Diode Laser Treatment

Trelka-Druzic,

Żórawski,

Lityńska-Dobrzyńska

et al. 2024

J Therm Spray Tech

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Cold-sprayed composite coatings have several advantages; however, some properties, such as hardness and abrasion resistance, are lower than those in plasma- or HVOF-sprayed deposits. This work showed that the use of surface diode laser processing allowed the development of (Cr3C2-25(Ni20Cr))-(Ni-graphite) cermet coatings with good adhesion to the steel substrate, and increased properties in the near-surface zone, below which the properties of cold-sprayed coatings were retained. Studies of the microstructure in the micro/nanoscale of the laser-treated coatings showed strong grain refinement after surface treatment. Cr7C3 carbide of various shapes and sizes was formed in the structure; while, a several hundred nanometre layer of Cr2O3 oxide appeared on the coating surface. The changes occurring in the microstructure have resulted in increased mechanical and tribological properties of the laser-treated zone of deposits.

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Section: Discussionmentioning

confidence: 88%

The Microstructure, Surface Topography and Wear Resistance of Cold-Sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) Composite Coatings Modified by Diode Laser Treatment

Trelka-Druzic,

Żórawski,

Lityńska-Dobrzyńska

et al. 2024

J Therm Spray Tech

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“…33 Second, the microstructural inhomogeneity also readily induced severe galvanic corrosion owing to the significant potential difference between different micro-regions inside the coating, which further increased the corrosion sensitivity. 34 Third, the heterogeneous surface had a negative effect on coating passive film, where the more the metallurgical defects, the weaker are the locations on passive film, and the worse is the stability of passive films. 35 It was known from PP curves that the formed oxide products on the coating surface were unable to provide effective passivation and protection, which therefore accelerated the degradation rate and eventually led to the poor resistance to corrosion.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and anti-corrosion performance of laser cladded Nb-modified Ni-based alloy coatings

Chen

Wang

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, Ni-based alloy coatings incorporated with Nb mass fractions of 0%, 3%, 6%, and 9% were successfully fabricated by laser cladding. The morphology, chemical composition, and phases of the obtained Nb-modified Ni-based coatings were characterized, and the effects of Nb contents on their electrochemical performance and immersion rates in 3.5 wt% NaCl solution were analyzed. The results show that the Ni-based coating with low Nb exhibits the most compact and refined microstructure, the best electrochemical passivation, and the lowest immersion corrosion rate of 3.30 × 10−3 mm/year. However, with increasing Nb content, the Laves phase is accumulated, and dendritic growth is promoted, which significantly decreases the coating passive stability and worsens the anti-corrosion performance.

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“…Meanwhile, the original coating's corrosion current density stood at 3.301 µA/cm 2 , lower than the figure prior to laser remelting. The increased coating density and homogenized microstructure led to a decrease in the post-remelting corrosion current density, with reduced interphase galvanic corrosion [45,46]. However, with the laser power increasing to 1800 W, the sample showed an increasing trend in the corrosion current density due to the excessive formation of Cr 7 C 3 at high laser powers, leading to an impeded corrosion resistance.…”

Section: Electrochemical Corrosion Analysismentioning

confidence: 99%

Effects of Laser Remelting on Frictional Properties of Supersonic Flame-Sprayed Coatings

Li,

Zhang,

et al. 2024

Coatings

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In this study, Cr3C2-Al2O3-NiCr coatings were prepared on INCONEL 600 alloy surfaces using the supersonic flame spraying technique, followed by a laser remelting treatment. In this way, this study further explored what impacts laser remelting has on coating performance. To this end, optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) were employed to carry out microstructural characterization. Energy-dispersive X-ray spectroscopy (EDS) was applied to conduct an analysis of the coatings’ elemental distribution while X-ray diffraction (XRD) was used to determine the coating phases. To measure the microhardness of the coatings, a microhardness tester was applied. In addition, the study investigated the samples’ electrochemical corrosion resistance and friction-wear performance under different surface conditions. According to the results, laser remelting enhanced the coating density, improved metallurgical bonding with the substrate, and optimized the carbide distribution, thereby enhancing corrosion and wear resistance in both air and corrosive media. However, excessive laser power hinders Cr3C2 nucleation, leading to diminished coating hardness and wear resistance in Cr7C3 formation.

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Pulsed laser remelting supersonic plasma sprayed Cr3C2-NiCr coatings for regulating microstructure, hardness and corrosion properties

Cited by 30 publications

References 38 publications

The Microstructure, Surface Topography and Wear Resistance of Cold-Sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) Composite Coatings Modified by Diode Laser Treatment

The Microstructure, Surface Topography and Wear Resistance of Cold-Sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) Composite Coatings Modified by Diode Laser Treatment

Microstructure and anti-corrosion performance of laser cladded Nb-modified Ni-based alloy coatings

Effects of Laser Remelting on Frictional Properties of Supersonic Flame-Sprayed Coatings

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