Effect of CeO2 on Corrosion Resistance of High-Current Pulsed Electron Beam Treated Pressureless Sintering Al-20SiC Composites

Sun, Yue; Gao, Bo; Hu, Liang; Li, Kui; Zhang, Ying

doi:10.3390/coatings11060707

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…Meantime, it can be observed that a certain amount of pore structure was distributed in the vicinity of the titanium carbide particles. Studies [25] have shown that when the sintering temperature is 590 • C, the liquid Al has a high viscosity, which leads to a relatively poor fluidity of liquid aluminum, making the material unable to complete its feeding during solidification and, finally, forming a pore structure. After HCPEB treatment, the surface morphology of Al-20TiC was changed, and it can be clearly seen that the large pores on the surface of the Al-20TiC were significantly reduced.…”

Section: Resultsmentioning

confidence: 99%

Effect of High-Current Pulsed Electron Beam on Properties of Graphene-Modified Aluminum Titanium Carbide Composites

et al. 2022

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High-current pulse electron beam (HCPEB) is an advanced surface modification technology developed in recent decades. This paper focuses on the effect of 0.3 wt.% graphene on the electrical conductivity and microhardness of HCPEB-treated Al-20TiC composites. The SEM results show that the titanium carbide was uniformly distributed in the aluminum matrix of the initial sample. Conversely, the graphene showed a small aggregation, and there were holes and cracks on the top surface of the sample. After HCPEB modification, the agglomeration of graphene gradually improved, and the number of surface pores reduced. The X-ray diffraction results show that after HCPEB treatment, the aluminum diffraction peak widened and shifted to a higher angle and the grain was significantly refined. Compared with the initial Al-20TiC composite samples, the conductivity of graphene-modified HCPEB-treated sample increased by 94.3%. The microhardness test results show that the microhardness of the graphene-modified HCPEB-treated sample increased by 18.4%, compared with the initial Al-20TiC composite samples. This enhancement of microhardness is attributed to the joint effects of fine grain strengthening, dispersion strengthening of the second phase, solution strengthening and dislocation strengthening. In brief, HCPEB has good application prospects for powder metallurgy in future.

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Section: Resultsmentioning

confidence: 99%

Effect of High-Current Pulsed Electron Beam on Properties of Graphene-Modified Aluminum Titanium Carbide Composites

et al. 2022

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“…The current density of DC electroplating is much lower than the peak current density of pulse electroplating. Pulse electrodeposition not only has an effect on the morphology of the plated layer, but also on the corrosion resistance of the plated coating [23][24][25][26][27][28]. However, the mechanism of the effects of pulse electroplating parameters on the morphology and corrosion resistance of silver coatings have received little attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of pulse electroplating parameters on the morphology and corrosion resistance of Ag plating coating

Zhang,

Li,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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Pulse electroplating technology has the characteristics of fine grain and good corrosion resistance. In order to ensure the good application of electroplated silver cone cavity in solar radiation detector. The effects of three process parameters, including average current density (0.4-1 A/dm2), pulse on-time (0.2-1.8 ms) and pulse off-time (0.8-4.8 ms), on the deposition rate, appearance and corrosion resistance of silver coating were studied by control variates. The surface morphology and composition of silver coatings were studied by scanning electron microscope (SEM), laser confocal microscopy and energy dispersive X-ray spectrometer (EDX). The corrosion resistance of silver coating in 3.5 wt.% NaCl solution was studied by polarisation curves and electrochemical impedance spectroscopy. The results show that pulse electroplating takes advantage of the dynamic change of current to influence the size of deposited particles and the degree of densification of the coating by precisely adjusting the pulse plating parameters, and ultimately obtains the coating with excellent morphology. The optimal parameters are: average current density 0.6 A/dm2, pulse on-time 1.2 ms, pulse off-time 1.8 ms. The silver coating prepared under process conditions has excellent corrosion resistance (7059 Ω/cm2). The surface crystal grain is dense, without obvious defects.

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“…However, this preparation method produces significant casting defects, such as porosity, cracking, and agglomeration, which limit the wide application of Al-20SiC composites [ 10 ]. Therefore, it is necessary to improve the properties of Al-20SiC composites using different treatment methods [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High Current Pulsed Electron Beam (HCPEB) on the Organization and Wear Resistance of CeO2-Modified Al-20SiC Composites

et al. 2023

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This paper investigates the joint effect of high current pulsed electron beam (HCPEB) and denaturant CeO2 on improving the microstructure and properties of Al-20SiC composites prepared by powder metallurgy. Grazing Incidence X-ray Diffraction (GIXRD) results indicate the selective orientation of aluminum grains, with Al(111) crystal faces showing selective orientation after HCPEB treatment. Casting defects of powder metallurgy were eliminated by the addition of CeO2. Scanning electron microscopy (SEM) results reveal a more uniform distribution of hard points on the surface of HCPEB-treated Al-20SiC-0.3CeO2 composites. Microhardness and wear resistance of the Al-20SiC-0.3CeO2 composites were better than those of the Al matrix without CeO2 addition at the same number of pulses. Sliding friction tests indicate that the improvement of wear resistance is attributed to the uniform dispersion of hard points and the improvement of microstructure on the surface of the matrix after HCPEB irradiation. Overall, this study demonstrates the potential of HCPEB and CeO2 to enhance the performance of Al-20SiC composites.

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Effect of CeO2 on Corrosion Resistance of High-Current Pulsed Electron Beam Treated Pressureless Sintering Al-20SiC Composites

Cited by 3 publications

References 34 publications

Effect of High-Current Pulsed Electron Beam on Properties of Graphene-Modified Aluminum Titanium Carbide Composites

Effect of High-Current Pulsed Electron Beam on Properties of Graphene-Modified Aluminum Titanium Carbide Composites

Effect of pulse electroplating parameters on the morphology and corrosion resistance of Ag plating coating

Effect of High Current Pulsed Electron Beam (HCPEB) on the Organization and Wear Resistance of CeO2-Modified Al-20SiC Composites

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