Rapid surface finishing of chemical vapour deposited tungsten carbide hard coatings by electropolishing

Micallef, Christian; Chiu, Chien‐Kuo; Zhuk, Yuri; Aria, Adrianus Indrat

doi:10.1016/j.surfcoat.2021.127900

Cited by 4 publications

(2 citation statements)

References 58 publications

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“…At present, the chromium-free passivation process of galvanized layers used and studied at home and abroad mainly includes three categories: inorganic passivation, organic passivation, and inorganic and organic composite passivation process [12][13][14][15][16][17][18][19][20][21][22][23]. The inorganic passivation system mainly includes silicate passivation, molybdate passivation, titanium passivation, tungstate passivation, etc [24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation

Cao

et al. 2023

Coatings

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The passivation of zinc alloy coating was achieved through the utilization of both silicate and trivalent chromium passivation systems, employing a specific process formula consisting of Co(NO3)2 at a concentration of 2.5 g/L, C76H52O46 at 3 mL/L, Na2SiO3 at 25 g/L, C6H5Na3O7 at 15 g/L, and an appropriate amount of organic accelerator. The composite passivation of silicate and tannic acid was found to be more effective than the trivalent chromium passivation film, as it successfully eliminated the dendrite structure on the coating surface and reduced surface defects. The coordination between negatively charged SiO2− or SiO2 micelles and Zn2+ results in the formation of a passivation film that exhibits lower corrosion current and higher corrosion potential compared to the trivalent chromium passivation film. Additionally, the impedance test fitting results indicate that the silicate passivation film possesses a higher resistance value. Overall, the proposed silicate passivation system presents a viable alternative to the toxic chromate passivation system, offering non-toxicity and superior protective performance relative to the trivalent chromium passivation system.

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Section: Introductionmentioning

confidence: 99%

Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation

Cao

et al. 2023

Coatings

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“…5 However, a highly polished surface (surface roughness (R a ) -1 nm) of the cemented carbide cutting tool is required before the coating to have better adhesion with the coating material. Micallef et al 6 performed electropolishing on the WC and analyzed the impact of different electrolytes during the finishing process. The final R a of 50 nm is obtained with 5 Wt.% NaOH in the electrolytic solution.…”

Section: Introductionmentioning

confidence: 99%

Optimization of surface roughness parameters in Hybrid-Chemo Magnetorheological Finishing (HC-MRF) process using Response Surface Methodology and Genetic Algorithm

Rajput

Das

Kapil

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hybrid Chemo-Magnetorheological Finishing ( HC-MRF) process is an advanced surface finishing process that utilizes the interaction of Magnetorheological Finishing and chemical etching to reduce the surface roughness of the cemented carbide cutting tools. Herein, Murakami’s reagent is used as a Magnetorheological (MR) fluid carrier medium to trigger chemical etching and mechanical abrasion. The synergic action reduces surface finishing time and increases process efficiency. However, optimizing process parameters during the HC-MRF process is required to improve process efficiency further. Response Surface Methodology ( RSM) is used to develop the regression model to study the impact of process parameters (i.e. spindle speed, feed rate, and vol.% of Murakami’s reagent in MR fluid) on the surface quality. Three surface roughness parameters, namely average surface roughness ( Ra), skewness ( Rsk), and kurtosis ( Rk), are opted to analyze the surface characteristics of the polished surface. Furthermore, optimization is performed with the help of a Genetic Algorithm ( GA) to achieve the best surface quality following input parameters. The surface roughness ( Ra) is reduced by 88.97% as the initial Ra value decreases to 34.50 nm from 312.87 nm after the HC-MRF process. The results obtained from RSM and GA are in good agreement with the experimental results. The optimum value of feed rate, spindle speed, and vol.% of Murakami’s reagent in the MR fluid while achieving minimum surface roughness value (i.e. 31.26 nm) through GA are 1.2 mm/min, 23 rpm, and 53%, respectively. The measured kurtosis ( Rku) value of 0.64 at the optimum process parameter condition represents flat peaks on the surface roughness irregularities of the polished surface. Similarly, a skewness ( Rsk) value of 1.46 signifies that the number of peaks is higher than the number of valleys on the polished surface. Furthermore, it is observed that the Vol.% of Murakami’s reagent in MR fluid is the most significant process parameter compared with other parameters among all responses.

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Surface finishing and residual stress improvement of chemical vapour deposited tungsten carbide hard coatings by vibratory polishing

Micallef

Walton

Zhuk³

et al. 2022

Surface and Coatings Technology

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Rapid surface finishing of chemical vapour deposited tungsten carbide hard coatings by electropolishing

Cited by 4 publications

References 58 publications

Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation

Inhibition of Surface Corrosion Behavior of Zinc-Iron Alloy by Silicate Passivation

Optimization of surface roughness parameters in Hybrid-Chemo Magnetorheological Finishing (HC-MRF) process using Response Surface Methodology and Genetic Algorithm

Surface finishing and residual stress improvement of chemical vapour deposited tungsten carbide hard coatings by vibratory polishing

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