Effect of CeO2 on the microstructure and microhardensss of laser-cladded Ni60 on 35CrMoV alloys

Gao, Zhongtang; Ren, Haibo; Yu, Yuan; Gao, Zhiming; Liu, Eryong; Zhang, Chuanwei

doi:10.1016/j.micron.2021.103146

Cited by 27 publications

(13 citation statements)

References 22 publications

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“…Introducing rare-earth oxides of nano-CeO 2 is one solution that can improve the fluidity of the molten pool and optimize the coating quality. Gao et al 15 added the CeO 2 in a Ni60-cladding layer, which considerably decreased the number of oxides, pores, and cracks in the composite coating. Wang et al 16 also improved the coating microstructure and properties by inhibiting cracks and porosities by adding nano-CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments

Chen

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Q235 steel is a low-cost material widely applied in modern industrial constructions. However, electrochemical degradation is the main drawback for its applications in chloride-enriched environments. To address this problem, NiCrAlMo and NiCrAlMo + 2 wt% nano-CeO2 composite coatings were laser-cladded on Q235 steel substrates. Characterization methods were used to investigate the microstructures, corrosion behaviors, and electrochemical mechanisms of the obtained coatings. The results showed that adding nano-CeO2 is conductive for removing residual gas pores and for refinement of grains, effectively improving the passive and electrochemical properties of the NiCrAlMo coating in both chloride-enriched solutions. Furthermore, the NiCrAlMoCeO2 composite coating exhibits a significantly reduced icorr of 0.4919 µA cm2 and an increased resistance ( Rp) of 175,310 Ω cm2 in a neutral solution, demonstrating the good anti-corrosion properties for its application in marine engineering structures.

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Section: Introductionmentioning

confidence: 99%

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments

Chen

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The addition of CeO 2 restores the BCC phase diffraction peak in the layer, and the peak is close to that of the FeCoNiCrMo0.2 coating. The addition of 2% CeO 2 decreased the diffraction peaks of complex dotted compounds, and according to the Debye–Scherrer formula [ 14 ] in Equation (5), the addition of CeO 2 reduced or refined the grain size.

…”

Section: Resultsmentioning

confidence: 99%

“…Their studies found that the powder mixed with rare earth elements can refine the grain and improve the grain boundary state, thus improving the performance of the cladding layer. At present, the most common rare earth powder additives are CeO 2 , Y 2 O 3 , La 2 O 3 , and so on [ 7 , 13 , 14 , 15 , 16 , 17 , 18 ]. Zhang et al [ 19 ] incorporated nano-CeO 2 particles as additives into Ni625 alloy powder and compared the differences in microstructure and electrochemical and tribological properties of Ni625 and Ni625 + 0.2% CeO 2 fused cladding layers.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, excessive CeO 2 can hinder the refinement of the microstructure and the improvement of microhardness, thus slightly reducing the wear resistance of the coating [ 20 ]. Gao et al [ 14 ] studied the effects of CeO 2 addition on crack sensitivity, microstructure, phase composition, solute segregation, and microhardness of the Ni60 cladding layer. Research shows that the addition of 4.0% CeO 2 can effectively suppress cracks and porosity in the Ni60 clad layer, promote grain refinement, and improve tissue uniformity, but too much CeO 2 will cause lattice distortion in each phase of the coating.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nano-CeO2 on Microstructure and Properties of WC/FeCoNiCrMo0.2 Composite High Entropy Alloy Coatings by Laser Cladding

et al. 2023

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FeCoNiCrMo0.2 high entropy alloy has many excellent properties, such as high strength, high wear resistance, high corrosion resistance, and high ductility. To further improve the properties of this coating, FeCoNiCrMo high entropy alloy (HEA) coatings, and two composite coatings, FeCoNiCrMo0.2 + WC and FeCoNiCrMo0.2 + WC + CeO2, were prepared on the surface of 316L stainless steel by laser cladding technology. After adding WC ceramic powder and CeO2 rare earth control, the microstructure, hardness, wear resistance, and corrosion resistance of the three coatings were carefully studied. The results show that WC powder significantly improved the hardness of the HEA coating and reduced the friction factor. The FeCoNiCrMo0.2 + 32%WC coating showed excellent mechanical properties, but the distribution of hard phase particles in the coating microstructure was uneven, resulting in unstable distribution of hardness and wear resistance in each region of the coating. After adding 2% nano-CeO2 rare earth oxide, although the hardness and friction factor decreased slightly compared with the FeCoNiCrMo0.2 + 32%WC coating, the coating grain structure was finer, which reduced the porosity and crack sensitivity of the coating, and the phase composition of the coating did not change; there was a uniform hardness distribution, a more stable friction coefficient, and the flattest wear morphology. In addition, under the same corrosive environment, the value of polarization impedance of the FeCoNiCrMo0.2 + 32%WC + 2%CeO2 coating was greater, the corrosion rate was relatively low, and the corrosion resistance was better. Therefore, based on various indexes, the FeCoNiCrMo0.2 + 32%WC + 2%CeO2 coating has the best comprehensive performance and can extend the service life of 316L workpieces.

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“…It can be seen from the above analysis that an appropriate amount of in situ precipitated Ti 2 SC in the 35 wt.% Ni-MoS 2 coating resulted in the fact that the continuous growth behavior of Ti 2 Ni was effectively blocked by the Ti 2 SC-Ti 2 Ni coherent mosaic structure phase, greatly increasing the distribution uniformity and reducing the cracking sensitivity of the coating, which was exactly the main reason for the optimal forming quality of the 35 wt.% Ni-MoS 2 coating. Studies have shown that the main factors influencing the microhardness of the coatings are the content and particle size of the reinforcing phase TiC, Ti 2 Ni, and the addition amount of Ni60 [33,34]. Furthermore, the microhardness of TiC was significantly higher than that of Ti 2 Ni [35].…”

Section: Formation Mechanism Of the Ti 2 Sc-ti 2 Ni Mosaic Structure ...mentioning

confidence: 99%

Microstructure and Tribological Properties of Lubricating-Reinforcing Laser Cladding Composite Coating with the Ti2SC-Ti2Ni Mosaic Structure Phase

et al. 2022

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Lubricating-reinforcing composite coatings were successfully prepared on Ti6Al4V using laser-clad Ti6Al4V/Ni60/Ni-MoS2 mixed powders with different Ni-MoS2 contents (25, 35, and 45 wt.%), and their microstructure and tribological properties were studied. The reinforcing phase TiC, Ti2Ni, and the lubricating phase Ti2SC were in situ precipitated while Ti2SC and Ti2Ni formed a mosaic coherent structure within the above three coatings. In the 25 and 45 wt.% Ni-MoS2 coatings, the microstructure distribution uniformity of the coatings was not effectively improved by the Ti2SC-Ti2Ni mosaic structure phase due to the lower or higher content of Ti2SC. In the 35 wt.% Ni-MoS2 coating, the forming quality of the coating was the best due to an appropriate amount of the uniformly distributed Ti2SC-Ti2Ni mosaic structure phase. Furthermore, the microhardness of the coatings gradually decreased as the amount of Ni-MoS2 increased. In the 35 wt.% Ni-MoS2 coating, due to the uniformly and diffusely distributed Ti2SC-Ti2Ni mosaic structure phase, the stable lubricating-reinforcing mosaic structure transfer composite films were formed during the progress of the friction and wear tests, which led to the optimal worn surface evenness and quality, the anti-friction and the wear resistance properties compared with the Ti6Al4V, 25 and 45 wt.% Ni-MoS2 coating.

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Effect of CeO2 on the microstructure and microhardensss of laser-cladded Ni60 on 35CrMoV alloys

Cited by 27 publications

References 22 publications

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments

Effects of Nano-CeO2 on Microstructure and Properties of WC/FeCoNiCrMo0.2 Composite High Entropy Alloy Coatings by Laser Cladding

Microstructure and Tribological Properties of Lubricating-Reinforcing Laser Cladding Composite Coating with the Ti2SC-Ti2Ni Mosaic Structure Phase

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Effect of CeO2 on the microstructure and microhardensss of laser-cladded Ni60 on 35CrMoV alloys

Cited by 27 publications

References 22 publications

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO2 composite coatings in chloride-enriched environments

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO2 composite coatings in chloride-enriched environments

Effects of Nano-CeO2 on Microstructure and Properties of WC/FeCoNiCrMo0.2 Composite High Entropy Alloy Coatings by Laser Cladding

Microstructure and Tribological Properties of Lubricating-Reinforcing Laser Cladding Composite Coating with the Ti2SC-Ti2Ni Mosaic Structure Phase

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Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments

Corrosion behaviors and electrochemical mechanisms of laser-cladded NiCrAlMo/nano-CeO₂ composite coatings in chloride-enriched environments