Fabrication Technology of Low-Adhesive Superhydrophobic and Superamphiphobic Surfaces Based on Electrochemical Machining Method

2013 ◽  
Vol 1 (2) ◽  
Author(s):  
Jinlong Song ◽  
Wenji Xu ◽  
Yao Lu ◽  
Limei Luo ◽  
Xin Liu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Magnesium Alloy ◽  
Electrochemical Etching ◽  
Electrochemical Machining ◽  
Superhydrophobic Surfaces ◽  
Nanometer Scale ◽  
Rolling Angle ◽  
Water Contact ◽  
Micrometer Scale ◽  
Steel Substrates

Low-adhesive superhydrophobic and superamphiphobic (both superhydrophobic and superoleophobic) surfaces with a liquid contact angle larger than 150 deg and rolling angle less than 10 deg have attracted great interest for fundamental research and potential application. However, the existing methods to fabricate the aforementioned surfaces are contaminative, dangerous, expensive, and time-consuming. Low-adhesive superhydrophobic surfaces on aluminum substrates and steel substrates were fabricated via electrochemical etching method and electrochemical deposition method, respectively. Low-adhesive superamphiphobic surfaces on magnesium alloy substrates were fabricated via one-step electrochemical etching method. The sample surfaces were investigated using electron microscopy, energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectrophotometry (FTIR), X-ray diffraction (XRD), optical contact angle measurements, and digital roughness and microhardness measurements. The SEM results show that the hierarchical rough structures composed of micrometer-scale pits, protrusions, rectangular-shaped plateaus, and smaller step-like structures and particles are present on the aluminum surfaces after electrochemical etching; meanwhile, the hierarchical micro/nanometer-scale rough structures composed of micrometer-scale globular structures and nanometer-scale SiO2 particles are present on the steel surfaces. After being modified with a low surface energy material, superhydrophobic surfaces on aluminum substrates with 167.0 deg water contact angle and 2 deg rolling angle and superhydrophobic surfaces on steel substrates with 172.9 deg water contact angle and 1 deg rolling angle are obtained. For magnesium alloy, the hierarchical micro/nanometer-scale rough structures composed of micrometer-scale, grain-like structures, protrusions, pits, globular structures, lump-like structures, and nanometer-scale sheets and needles are present on the magnesium alloy surfaces. After obtaining the hierarchical micro/nanometer-scale rough structures, the magnesium alloy surfaces directly show a superamphiphobicity without any chemical modification. The hierarchical rough structures are essential to fabricate superhydrophobic surfaces. In addition, the re-entrant structures are important to fabricate superamphiphobic surfaces. Furthermore, the proposed electrochemical machining method is simple, economic, and highly effective.

Fabrication of Superhydrophobic Surfaces on Aluminum Substrates via Electrochemical Etching and Re-Deposition

2012 ◽  
Vol 197 ◽  
pp. 351-355 ◽  
Author(s):  
Jin Long Song ◽  
Xin Liu ◽  
Yao Lu ◽  
Li Bo Wu ◽  
Wen Ji Xu
Keyword(s):  
Electrochemical Etching ◽  
Superhydrophobic Surfaces ◽  
Aluminum Surface ◽  
Nanometer Scale ◽  
Water Contact ◽  
Leaf Surfaces ◽  
Main Components ◽  
Aluminum Substrates ◽  
Micrometer Scale ◽  
Micro Structures

Superhydrophobic surfaces on metal substrates are often prepared via roughing the surfaces and lowering their surface energy. The superhydrophobic aluminum surface with a water contact angle of 162.5° and rolling angle less than 6° was fabricated via electrochemical etching and re-deposition using the alkalic Na3PO4 electrolyte and then fluorination treating. The surface morphology and chemical composition were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results show that the surface consists of the micrometer-scale lumps and protrusions, and many nanometer-scale mastoids are filled in these protrusions. These hierarchical micro/nanometer-scale binary structures, which are similar to the micro-structures of lotus leaf surfaces, play an important role in achieving superhydrophobicity. The main components of the binary geometric structures are Al2O3, AlPO4, and H2O. The effects of the processing time and processing voltage on the macro-morphology were also investigated. The macro-rough structures appeared on the edge of the aluminum surface firstly, and then spread gradually to the entire surface.

A Two-Step Method to Prepare Stable Superhydrophobic Surface on Steel Substrates

2012 ◽  
Vol 463-464 ◽  
pp. 349-353 ◽  
Author(s):  
Feng Guo ◽  
Xun Jia Su ◽  
Gen Liang Hou ◽  
Zhao Hui Liu ◽  
Hai Peng Jia
Keyword(s):  
Contact Angle ◽  
Superhydrophobic Surface ◽  
Low Cost ◽  
Superhydrophobic Surfaces ◽  
Step Method ◽  
Water Contact ◽  
Lotus Leaf ◽  
Nanoscale Particles ◽  
Steel Substrates

Superhydrophobic surfaces have been a hot topic during the last decade owing to their great potential in widely application. In this work, we report on a facile and low-cost two-step method to fabricate superhydrophobic surface on steel substrates. The as-obtained surface shows an interesting hierarchical structure composed of microscale flowerlike cluster and nanoscale particles, which is similar to that of a lotus leaf. After further modification with stearic acid, the resultant surface exhibits remarkable superhydrophobic properties. The water contact angle is as high as 155°. Moreover, the superhydrophobic properties are long-term stable.

scholarly journals A Simple Method to Create Superhydrophobic Aluminium Surfaces

2012 ◽  
Vol 706-709 ◽  
pp. 2874-2879 ◽  
Author(s):  
R. Jafari ◽  
Masoud Farzaneh
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Synergistic Effects ◽  
Low Cost ◽  
Contact Angle Hysteresis ◽  
Spray Coating ◽  
Superhydrophobic Surfaces ◽  
Water Contact ◽  
Simple Method ◽  
Static Contact

Superhydrophobic surfaces were prepared using a very simple and low-cost method by spray coating. A high static water contact angle of about 154° was obtained by deposition of stearic acid on an aluminium alloy. However, this coating demonstrated a high contact angle hysteresis (~ 30º). On the other hand, superhydrophobic surfaces with a static contact angle of about 162º and 158º, and a low contact angle hysteresis of about 3º and 5º were respectively obtained by incorporating nanoparticles of SiO2and CaCO3in stearic acid. The excellent resulting hydrophobicity is attributed to the synergistic effects of micro/nanoroughness and low surface energy. A study of the wettability of these surfaces at temperatures ranging from 20 to-10 °C showed that the superhydrophobic surface becomes rather hydrophobic at supercooled temperatures.

scholarly journals Electrochemical machining of superhydrophobic surfaces on mold steel substrates

2018 ◽  
Vol 344 ◽  
pp. 499-506 ◽  
Author(s):  
Jinlong Song ◽  
Wenbo Huang ◽  
Jiyu Liu ◽  
Liu Huang ◽  
Yao Lu
Keyword(s):  
Electrochemical Machining ◽  
Superhydrophobic Surfaces ◽  
Steel Substrates

scholarly journals Reversible Superwetting Transition Between Superhydrophilicity and Superhydrophobicity on a Copper Sheet, and Its Corrosion Performance

2021 ◽  
Vol 8 ◽  
Author(s):  
Hong Li ◽  
Tiange Chen ◽  
Yanfeng Lu ◽  
Xinyu Fu ◽  
Xingwen Chu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Contact Angle ◽  
Superhydrophobic Surfaces ◽  
Corrosion Performance ◽  
Copper Sheet ◽  
Water Contact ◽  
Good Corrosion Resistance ◽  
Whole Process ◽  
Potentiodynamic Polarization Curves ◽  
Surface Modified

Dense copper oxide nanoribbons arrays are prepared on a copper sheet by using a low-temperature hydrothermal method. The wettability of the surface modified by stearic acid is superhydrophobic, and the water contact angle is 153.6°. It is demonstrated that the reversible transition from superhydrophilicity to superhydrophobicity is successfully achieved by heat treatment and re-modification, and the whole process can be accomplished in 170 s. Potentiodynamic polarization curves and Nyquist curves show that these superhydrophobic surfaces have good corrosion resistance and superior durability.

scholarly journals Facile Electrochemical Method for the Fabrication of Stable Corrosion-Resistant Superhydrophobic Surfaces on Zr-Based Bulk Metallic Glasses

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1558
Author(s):  
Mengmeng Yu ◽  
Ming Zhang ◽  
Jing Sun ◽  
Feng Liu ◽  
Yujia Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Surface Energy ◽  
Metallic Glasses ◽  
Composite Structures ◽  
Superhydrophobic Surface ◽  
Electrochemical Method ◽  
Electrochemical Etching ◽  
Superhydrophobic Surfaces ◽  
Nano Composite

Both surface microstructure and low surface energy modification play a vital role in the preparation of superhydrophobic surfaces. In this study, a safe and simple electrochemical method was developed to fabricate superhydrophobic surfaces of Zr-based metallic glasses with high corrosion resistance. First, micro–nano composite structures were generated on the surface of Zr-based metallic glasses by electrochemical etching in NaCl solution. Next, stearic acid was used to decrease surface energy. The effects of electrochemical etching time on surface morphology and wettability were also investigated through scanning electron microscopy and contact angle measurements. Furthermore, the influence of micro–nano composite structures and roughness on the wettability of Zr-based metallic glasses was analysed on the basis of the Cassie–Baxter model. The water contact angle of the surface was 154.3° ± 2.2°, and the sliding angle was < 5°, indicating good superhydrophobicity. Moreover, the potentiodynamic polarisation test and electrochemical impedance spectroscopy suggested excellent corrosion resistance performance, and the inhibition efficiency of the superhydrophobic surface reached 99.6%. Finally, the prepared superhydrophobic surface revealed excellent temperature-resistant and self-cleaning properties.

scholarly journals Electrospun highly corrosion-resistant polystyrene–nickel oxide superhydrophobic nanocomposite coating

2021 ◽  
Author(s):  
A. Bahgat Radwan ◽  
Cheirva A. Mannah ◽  
Mostafa H. Sliem ◽  
Noora Hamad S. Al-Qahtani ◽  
Paul C. Okonkwo ◽  
...  
Keyword(s):  
Contact Angle ◽  
Nickel Oxide ◽  
Contact Angle Hysteresis ◽  
Nanocomposite Coating ◽  
Nanometer Scale ◽  
Water Contact ◽  
Saline Environment ◽  
Corrosion Resistant ◽  
Superhydrophobic Coatings ◽  
Nyquist Plots

AbstractA key challenge in producing superhydrophobic coatings (SHC) is to tailor the surface morphology on the micro-nanometer scale. In this work, a feasible and straightforward route was employed to manufacture polystyrene/nickel oxide (PSN) nanocomposite superhydrophobic coatings on aluminum alloys to mitigate their corrosion in a saline environment. Different techniques were employed to explore the influence of the addition of NiO nanoparticles to the as-prepared coatings. PSN-2 composite with ~ 4.3 wt% of NiO exhibited the highest water contact angle (WCA) of 155° ± 2 and contact angle hysteresis (CAH) of 5°. Graphic abstract EIS Nyquist plots of 3 g of electrospun polystyrene coatings (a) without and with (b) 0.1, (c) 0.15, and (d) 0.2 g of NiO.

Microsecond Laser Texturing of an Aerospace Grade Aluminum Alloy to Synthesize Superhydrophobic, Anti-Water Clogging Surfaces

2021 ◽  
Vol 875 ◽  
pp. 322-328
Author(s):  
Aneeqa Naeem ◽  
Esham Butt ◽  
Hamza Khawaja ◽  
Irfan Nadeem ◽  
Rehan Akhter ◽  
...  
Keyword(s):  
Contact Angle ◽  
Titanium Nitride ◽  
Water Contact Angle ◽  
Laser Pulses ◽  
Superhydrophobic Surfaces ◽  
Aluminum Surface ◽  
Laser Texturing ◽  
Water Contact ◽  
Line Separation ◽  
Aluminum Surfaces

Traditionally superhydrophobic surfaces are prepared by applying liquid repellant organic coatings or nano-based coatings. These superhydrophobic coatings are prone to wear and can be easily damaged by abrasion and cleaning. Recently researchers are switching interest to more efficient and promising technology of pulse laser texturing for engineering sub-micron topographies to have superhydrophobic surfaces. In this research, the micro-second Laser Pulses are used to feature sub-micron textures on titanium nitride coated aluminum and polished aluminum surfaces in order to achieve the water contact angle greater than 150°. Titanium nitride coated aluminum surface with scan line separation of 50 µm shows superior hydrophobicity having a water contact angle of 156º. These superhydrophobic aluminum surfaces have applications for anti-water clogging and anti-corrosion use.

Sign in / Sign up

Export Citation Format

Share Document