Improvement of selective laser melting substrate surface performance via combined processing of jet electrochemical machining and jet electrodeposition

Cheng, Haixia; Xu, Bolei; Xie, Dexin; Yang, Youwen; Shen, Lida; Qiu, Mingbo; Ya, Chen; Lou, Guibin; Zhao, Jianfeng; Tian, Zongjun

doi:10.1016/j.surfcoat.2021.127028

Cited by 12 publications

(4 citation statements)

References 51 publications

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“…The ultimate current density during the electrodeposition reaction increased, and the reaction rate accelerated. According to the Nernst equation, , the equilibrium electrode potential increases at increasing temperature, and the solution activity increases, leading to a rise in the equilibrium electrode potential. The cathodic overpotential η c is η normalc = E − E normalc where E is the equilibrium electrode potential and E c is the cathodic potential.…”

Section: Resultsmentioning

confidence: 99%

“…Because W atoms are larger than Ni and Co, W atoms enter the lattice of Ni and Co, resulting in fine grain strengthening. , As a result, the increased W content of the coating leads to grain refinement and a decrease in the average grain size. For the LECD Ni–Co–W alloy coating, the thermal effect of laser irradiation lowers the activation energy, elevates the cathodic overpotential, and enhances the irradiated microregion solution temperature. This resulted in faster electrochemical deposition rates and new nuclei formation rates during the crystallization and refinement of the coating grains.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of the Enhancement Mechanism of Electrochemically Deposited Ni–Co–W Coatings via Laser Irradiation: Effect of W Contents on Corrosion Resistance

Yang

Zhang

et al. 2023

Langmuir

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Ni−Co−W is an alloy with excellent overall performance and wide application prospects. Electrochemical deposition of Ni−Co−W alloys is currently the most promising process for replacing hexavalent chromium plating. Variations in the W content of the Ni−Co−W coating significantly affect its surface morphology, internal structure, and mechanical properties. Considering the numerous defects with conventional electrochemical deposition, a laser was introduced to enhance the quality and rate of deposition. Using a multienergy composite field, the deposition technique enhanced various properties at room temperature. Ni−Co−W alloy coatings were fabricated through electrochemical deposition and laser electrochemical deposition using electrolytes containing Na 2 WO 4 •2H 2 O at concentrations of 12, 15, 18, and 24 g/L in this investigation. This study aimed to examine how laser irradiation strengthens the corrosion resistance of the coatings. The corrosion resistance could be enhanced with an initial W content increase, but the corrosion resistance did not depend entirely on the W content. Variations in the W content of the electrochemically deposited coatings affected the surface morphology, residual internal stresses, and crystal structure, changing the corrosion resistance. In contrast, the laser electrochemical deposition coating was caused by the combined effect of the W content and laser irradiation (concentration of <18 g/L). Laser electrochemical deposition of the Ni−Co−W coating resulted in a higher W content than electrochemical deposition (≥3.5%), improved the residual internal stresses, and refined the grain size of the coating, resulting in better corrosion resistance (corrosion rate decreased by 74% and R ct increased by 109.1% at most).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigation of the Enhancement Mechanism of Electrochemically Deposited Ni–Co–W Coatings via Laser Irradiation: Effect of W Contents on Corrosion Resistance

Yang

Zhang

et al. 2023

Langmuir

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“…39c). Cheng et al applied a combined EJM-EJD approach to machine and electrodeposit material as part of a finishing operation for LPBF parts [209].…”

Section: Additive Manufacturing: Finishing and Fabricationmentioning

confidence: 99%

Electrochemical jet manufacturing technology: From fundamentals to application

Speidel¹,

Bisterov²,

Saxena³

et al. 2022

International Journal of Machine Tools and Manufacture

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“…Tian et al proposed a combined processing method of jet electrochemical machining and jet electrodeposition to improve the surface quality of metal parts fabricated by AM. 10 Through the proposed method, not only the surface defects were removed, a coating on the surface was obtained with improved hardness, corrosion and wear resistance. In consideration of its unique microstructure, the electrochemical dissolution behaviors of the DED material have also been investigated.…”

Section: List Of Symbolsmentioning

confidence: 99%

Surface Flattening of Directed Energy Deposited Parts through Jet Electrochemical Machining

WANG

2021

J. Electrochem. Soc.

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For additive manufacturing (AM) processes, post-processing is usually needed before application, and electrochemical machining is considered a promising candidate for this purpose. Here, the possibility of using jet electrochemical machining (Jet-ECM) as a semi-finishing post-processing for directed energy deposition (DED) was investigated. The main purpose is to flatten the wave-like surface and improve dimensional accuracy. First, polarization, EIS, and current efficiency measurements were conducted, and it was found that the electrochemical dissolution behaviors of the DED-produced Inconel 718 alloy in NaNO3 solution were isotropic and irrelevant to the DED parameters, which can be attributed to the effect of the passive film. Pa and Pz values from the primary profile were considered more suitable than surface roughness for the characterization of the surface flatness. In the Jet-ECM experiments, the small inter-electrode gaps and high applied voltages were found to be beneficial to surface flattening, while the influence of the scanning speed was not evident. Multiple reciprocating scans could further improve the surface flatness, but most of the improvements were obtained in the first scan. This demonstrates the great potential of Jet-ECM in the post-processing of AM parts, and provide several essential guidelines for further research.

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Improvement of selective laser melting substrate surface performance via combined processing of jet electrochemical machining and jet electrodeposition

Cited by 12 publications

References 51 publications

Investigation of the Enhancement Mechanism of Electrochemically Deposited Ni–Co–W Coatings via Laser Irradiation: Effect of W Contents on Corrosion Resistance

Investigation of the Enhancement Mechanism of Electrochemically Deposited Ni–Co–W Coatings via Laser Irradiation: Effect of W Contents on Corrosion Resistance

Electrochemical jet manufacturing technology: From fundamentals to application

Surface Flattening of Directed Energy Deposited Parts through Jet Electrochemical Machining

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