Fabrication of superhydrophobic metallic surface on the electrical discharge machining basement

Wang, Han; Chi, Guanxin; Wang, Yukui; Yu, Fuxin; Wang, Zhenlong

doi:10.1016/j.apsusc.2019.01.102

Cited by 40 publications

(13 citation statements)

References 30 publications

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“…SHS refers to a surface with a water contact angle (CA) greater than 150 • and a sliding angle (SA) lower than 10 • [11]. Many creatures in nature, including the lotus leaf, water-strider legs, and rice leaf, show good superhydrophobic properties [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Dong

Meng

et al. 2020

Micromachines

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Aluminum alloys are widely used, but they are prone to contamination or damage under harsh working environments. In this paper, a self-cleaning superhydrophobic aluminum alloy surface with good corrosion resistance was successfully fabricated via the combination of sand peening and electrochemical oxidation, and it was subsequently covered with a fluoroalkylsilane (FAS) film. The surface morphology, surface wettability, and corrosion resistance were investigated using a scanning electron microscope (SEM), an optical contact angle measurement, and an electrochemical workstation. The results show that binary rough structures and an FAS film with a low surface energy on the Al alloy surfaces confer good superhydrophobicity with a water contact angle of 167.5 ± 1.1 • and a sliding angle of 2.5 ± 0.7 • . Meanwhile, the potentiodynamic polarization curve shows that the corrosion potential has a positively shifted trend, and the corrosion current density decreases by three orders of magnitude compared with that of the original aluminum alloy sample. In addition, the chemical stability of the as-prepared superhydrophobic surface was evaluated by dripping test using solutions with different pH values for different immersion time. It indicates that the superhydrophobic surface could provide long-term corrosion protection for aluminum alloys. Consequently, the as-prepared superhydrophobic surface has excellent contamination resistance and self-cleaning efficacy, which are important for practical applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Dong

Meng

et al. 2020

Micromachines

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“…The E corr of the as-prepared superhydrophobic surface could reach up to −0.20 V, which is quite a bit more positive than that of the original surface (−0.48 V), EDM surface (−0.58 V), original and modification (−0.45 V), and ECE and modification surface (−0.42 V), indicating the as-prepared superhydrophobic surface with the best corrosion resistance. The i corr of the as-prepared superhydrophobic surface reached 5.01 × 10 −8 A cm −2 , which is three orders of magnitude lower than the EDM surface (7.94 × 10 −5 A cm −2 ), two orders of magnitude lower than the original surface (1.26 × 10 −6 A cm −2 ), and one order of magnitude lower than the original and modification (5.62 × 10 −7 A cm −2 ), and ECE and modification surface (2.51 × 10 −7 A cm −2 ), indicating the as-prepared superhydrophobic surface with the lowest corrosion rate [ 47 , 48 , 49 ]. The E corr of the EDM surface (−0.58 V) was more negative than that of the original surface (−0.48 V), and the i corr of the EDM surface (7.94 × 10 −5 A cm −2 ) was an order of magnitude higher than that of the original surface (1.26 × 10 −6 A cm −2 ), showing that the corrosion resistance of the titanium surface was reduced by EDM.…”

Section: Resultsmentioning

confidence: 99%

“…The Nyquist plots and Bode plots of the titanium surfaces at different processes are shown in Figure 9 b,c. In Nyquist plots, the impedance semicircle diameter is related to polarization resistance, and a larger impedance semicircle diameter represents better corrosion resistance [ 24 , 47 ]. Significantly, the impedance semicircle diameter of the as-prepared superhydrophobic surface increases sharply, approaching ten thousand kΩ·cm 2 ( Figure 9 b), about 16 times compared to the original surface.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of a Superhydrophobic Surface with Robust Micro-/Nanoscale Hierarchical Structures on Titanium Substrate

Dong

Wang

et al. 2020

Nanomaterials

Self Cite

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A superhydrophobic surface with robust structures on a metallic surface could improve its application in various harsh conditions. Herein, we developed a new strategy to fabricate robust micro-/nanoscale hierarchical structures with electrical discharge machining and electrochemical etching on a titanium substrate. After modification by fluorinated silane, the static water contact angle and slide angle of the surface could reach 162 ± 2° and 4 ± 1°, respectively. The superhydrophobic surfaces showed good corrosion resistance and mechanical stability after scratching with sandpapers. In addition, the superhydrophobic surfaces had good self-cleaning performance even in an acidic environment as well as the potential to be used as guiding tracks in droplet microfluidics and lab-on-a-chip systems. These results are expected to be helpful in designing the surface of liquid float gyroscope parts.

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“…Microstructures have been frequently exploited to improve component tribological qualities [1][2][3][4]. A number of methods have been developed to produce microstructures in different ways, such as laser beam machining [5], micro-milling [6], electrical discharge machining [7], and through-mask electrochemical etching (TMEE) [8,9]. Compared to these methods, TMEE is a promising method for microstructures preparation with no tool wear, no heat-affected layers, and high machining efficiency.…”

Section: Introductionmentioning

confidence: 99%

Investigation on particle assisted through-mask electrochemical etching of micro pits array

Du¹,

Yu²,

Zhai³

et al. 2022

Preprint

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Microstructures are applied in various fields to improve the friction and lubrication of mechanical components. Through-mask electrochemical etching (TMEE) has shown good feasibility in machining microstructures array. However, the machining precision of microstructures gradually decreases with increasing etching depth in TMEE. Localization and uniformity are essential indicators of machining precision in TMEE. Herein, particle assisted through-mask electrochemical etching (PA-TMEE) method was proposed to improve the localization and uniformity. Firstly, a coupled multi-physical field model, including gas-liquid two-phase flow, particle motion, and electrochemical processes, was established and adopted to predict the profiles of micro pits. Secondly, a comparison experiment between PA-TMEE and traditional TMEE was performed. The experimental results show that using PA-TMEE instead of TMEE resulted in improved localization and uniformity of the micro pits array. Then, the paper analyzed the effect of particle diameter and content on micro pits. When the particle diameter was 40 µm, and the particle content was 6 g/L, the maximum etching factor was 2.4. The minimum coefficient of variation of the diameter and depth of micro pits were 3.3% and 5.2%. Finally, The machining mechanism of PA-TMEE was analyzed by Scanning Electron Microscopy and Energy Dispersive Spectrometer.

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Fabrication of superhydrophobic metallic surface on the electrical discharge machining basement

Cited by 40 publications

References 30 publications

Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Facile Fabrication of a Superhydrophobic Surface with Robust Micro-/Nanoscale Hierarchical Structures on Titanium Substrate

Investigation on particle assisted through-mask electrochemical etching of micro pits array

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