Preparation of anti-corrosion superhydrophobic coatings by an Fe-based micro/nano composite electro-brush plating and blackening process

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103000-103012 ◽  
Author(s):  
Yan Wei ◽  
Liu Hongtao ◽  
Zhu Wei
Keyword(s):  
Stearic Acid ◽  
Steel Plates ◽  
Superhydrophobic Surfaces ◽  
Nano Composite ◽  
Superhydrophobic Coatings ◽  
Brush Plating ◽  
Subsequent Modification

A method using Fe-based micro/nano composite electro-brush plating and subsequent modification with stearic acid was established for fabricating superhydrophobic surfaces on A3 steel plates.

Superhydrophobic Coatings: The Salvinia Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water (Adv. Mater. 21/2010)

2010 ◽  
Vol 22 (21) ◽  
pp. n/a-n/a ◽  
Author(s):  
Wilhelm Barthlott ◽  
Thomas Schimmel ◽  
Sabine Wiersch ◽  
Kerstin Koch ◽  
Martin Brede ◽  
...  
Keyword(s):  
Superhydrophobic Surfaces ◽  
Superhydrophobic Coatings

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 Development of Organosilicon-Based Superhydrophobic Coatings through Atmospheric Pressure Plasma Polymerization of HMDSO in Nitrogen Plasma

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 219 ◽  
Author(s):  
Siavash Asadollahi ◽  
Jacopo Profili ◽  
Masoud Farzaneh ◽  
Luc Stafford
Keyword(s):  
Contact Angle ◽  
Atmospheric Pressure ◽  
Plasma Polymerization ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Superhydrophobic Surfaces ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Superhydrophobic Coatings

Water-repellent surfaces, often referred to as superhydrophobic surfaces, have found numerous potential applications in several industries. However, the synthesis of stable superhydrophobic surfaces through economical and practical processes remains a challenge. In the present work, we report on the development of an organosilicon-based superhydrophobic coating using an atmospheric-pressure plasma jet with an emphasis on precursor fragmentation dynamics as a function of power and precursor flow rate. The plasma jet is initially modified with a quartz tube to limit the diffusion of oxygen from the ambient air into the discharge zone. Then, superhydrophobic coatings are developed on a pre-treated microporous aluminum-6061 substrate through plasma polymerization of HMDSO in the confined atmospheric pressure plasma jet operating in nitrogen plasma. All surfaces presented here are superhydrophobic with a static contact angle higher than 150° and contact angle hysteresis lower than 6°. It is shown that increasing the plasma power leads to a higher oxide content in the coating, which can be correlated to higher precursor fragmentation, thus reducing the hydrophobic behavior of the surface. Furthermore, increasing the precursor flow rate led to higher deposition and lower precursor fragmentation, leading to a more organic coating compared to other cases.

scholarly journals Water droplet friction and rolling dynamics on superhydrophobic surfaces

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Matilda Backholm ◽  
Daniel Molpeceres ◽  
Maja Vuckovac ◽  
Heikki Nurmi ◽  
Matti J. Hokkanen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Friction Force ◽  
Water Droplet ◽  
Superhydrophobic Surfaces ◽  
Silicon Surfaces ◽  
Force Sensors ◽  
Water Droplets ◽  
Indirect Contact ◽  
Gold Standard Method ◽  
Superhydrophobic Coatings

Abstract Superhydrophobicity is a remarkable surface property found in nature and mimicked in many engineering applications, including anti-wetting, anti-fogging, and anti-fouling coatings. As synthetic superhydrophobic coatings approach the extreme non-wetting limit, quantification of their slipperiness becomes increasingly challenging: although contact angle goniometry remains widely used as the gold standard method, it has proven insufficient. Here, micropipette force sensors are used to directly measure the friction force of water droplets moving on super-slippery superhydrophobic surfaces that cannot be quantified with contact angle goniometry. Superhydrophobic etched silicon surfaces with tunable slipperiness are investigated as model samples. Micropipette force sensors render up to three orders of magnitude better force sensitivity than using the indirect contact angle goniometry approach. We directly measure a friction force as low as 7 ± 4 nN for a millimetric water droplet moving on the most slippery surface. Finally, we combine micropipette force sensors with particle image velocimetry and reveal purely rolling water droplets on superhydrophobic surfaces.

scholarly journals Special Issue on Superhydrophobic Coatings for Corrosion and Tribology

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 668
Author(s):  
Wang ◽  
Zhao
Keyword(s):  
Corrosion Protection ◽  
Water Repellency ◽  
Superhydrophobic Surfaces ◽  
Special Issue ◽  
Superhydrophobic Coatings ◽  
Lotus Leaves

Superhydrophobicity, showing strong water-repellency, has been widely investigated for many applications, especially in the fields of corrosion protection and antifouling. Water tends to roll off from superhydrophobic surfaces like natural lotus leaves[...]

Development of Superhydrophobic Coatings on AA 7075 by Surface Modification Using Fatty Acids

2020 ◽  
Vol 833 ◽  
pp. 69-73
Author(s):  
Saikiran Amruthaluru ◽  
Siva Kumar Mamidi ◽  
Arun Mohan Nair ◽  
Hariprasad Sampatirao ◽  
Rameshbabu Nagumothu
Keyword(s):  
Fatty Acids ◽  
Contact Angle ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Stearic Acid ◽  
Myristic Acid ◽  
Superhydrophobic Coatings ◽  
Naoh Solution ◽  
Aa 7075 ◽  
Passivation Time

The present work is aimed at developing superhydrophobic coatings on AA 7075 using two different fatty acids namely Stearic acid and Myristic acid. The coating was developed by initially etching the substrate in 1 M NaOH solution at a temperature of 70 °C for 10 hours, followed by passivating in 0.01 M ethanolic stearic acid and 0.01 M ethanolic myristic acid for different durations of passivation time. The coated samples were further investigated for their surface morphology, wettability and corrosion resistance. The contact angle and surface morphology of the developed coatings were assessed by contact angle goniometer and scanning electron microscopy (SEM) respectively. The corrosion behavior of the coatings was studied in 3.5 Wt. % aqueous NaCl solution by potentiodynamic polarization test (PDP). Passivation using fatty acids resulted in alteration of the surface morphology, which resulted in the increase of the contact angle exhibiting superhydrophobic nature, which also enhanced the corrosion resistance of the alloy.

scholarly journals Zirconia Nanotube Coatings - UV-Resistant Superhydrophobic Surfaces

2021 ◽  
Author(s):  
Swathi Naidu Vakamulla Raghu ◽  
Manuela S Killian ◽  
Khajidkhand Chuluunbandi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mechanical Stability ◽  
Single Step ◽  
Superhydrophobic Surfaces ◽  
Electrochemical Anodization ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces ◽  
Superhydrophobic Coatings ◽  
Assembled Monolayers ◽  
Nanostructured Oxide

Surface modifications influence material interactions such as wettability, imparting hydrophobicity or hydrophilicity. Mainstream research focused on enhancing product shelf-life, directs attention towards superhydrophobic surfaces (SHS). SHS offer several benefits for outdoor applications such as self-cleaning, anti-soiling, anti-mist etc. In this manuscript, we explore the possibility of combining structural and chemical modifications to metal substrates in order to create superhydrophobic metal oxide surfaces. ZrO2-nanotubes are evaluated with regard to their application as transparent UV-stable superhydrophobic coatings. Nanostructured oxide surfaces are created via single-step electrochemical anodization. The absence of HF acid-based pre-etching steps offer a safe and alternatively a green synthesis route. Anodized oxides are modified using octadecylphosphonic acid self-assembled monolayers, demonstrate superhydrophobicity and are evaluated for their mechanical stability under a jet of water, chemical stability under indirect sunlight irradiation in air/water and direct UV exposure. Zirconia nanotubular films were evaluated for optical transparency using light microscopy and surface wettability of the different zirconia-composites was compared to the model system-titania. Structural and compositional differences of the SAM layer upon time dependent decay were analyzed with X-ray photoelectron spectroscopy. <br>

Fabrication of low adhesive superhydrophobic surfaces using nano Cu/Al 2 O 3 Ni–Cr composited electro-brush plating

2015 ◽  
Vol 356 ◽  
pp. 81-90 ◽  
Author(s):  
Tianchi Chen ◽  
Shirong Ge ◽  
Hongtao Liu ◽  
Qinghe Sun ◽  
Wei Zhu ◽  
...  
Keyword(s):  
Superhydrophobic Surfaces ◽  
Brush Plating

Fabrication of Superhydrophobic Surfaces on Copper Substrates via Brush Plating Technique

2013 ◽  
Vol 834-836 ◽  
pp. 662-669 ◽  
Author(s):  
Ke Hu ◽  
Quan Xin Xu ◽  
Xiao Long Yang
Keyword(s):  
Large Scale ◽  
Superhydrophobic Surfaces ◽  
Scale Production ◽  
Sliding Angle ◽  
Water Contact ◽  
Copper Surfaces ◽  
Plating Technique ◽  
Large Scale Production ◽  
Sample Technique ◽  
Brush Plating

Superhydrophobic surfaces on metal substrates are often prepared via roughing the surfaces and lowering their surface energy. Composite brush plating technique is developed to prepare superhydrophobic n-SiO2/Ni brush plating composite coating on copper surfaces. Under the better process parameters, the water contact angle of the obtained superhydrophobic surface is approximately 160°, and the water sliding angle is less than 10°. The influences of plating voltage and plating time on the coating surface structure and hydrophobicity were discussed. 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 prepared surfaces have the appearance of the uniform micron papilla-like structures, which are composed of submicron globular Ni particles covered with n-SiO2nanoscale villiform structures. These hierarchical micro/nanostructures are similar to the lotus leaf and play an important role in gaining superhydrophobicity. It is expected that this sample technique will be widely used for large-scale production of superhydrophobic engineering materials.

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