One-Step Potentiostatic Deposition of Micro-Particles on Al Alloy as Superhydrophobic Surface for Enhanced Corrosion Resistance by Reducing Interfacial Interactions

Corrosion failure is a thorny problem that restricts the application of Al alloys. As a new technique for functional realization, hydrophobic preparation offers an efficient approach to solve corrosion problem. This work has developed a facile and low-cost method to endow Al alloy with enhanced water-repellent and anticorrosion abilities. The micro-particles have been firstly prepared by one-step deposition process. Furthermore, wetting and electrochemical behaviors of as-prepared structures have been investigated after silicone modification. Results show that the fabricated surface possesses excellent superhydrophobicity with a water contact angle (CA) of 154.7° and a sliding angle (SA) of 6.7°. Meanwhile, the resultant surface is proved with enhanced corrosion resistance by reducing interfacial interactions with seawater, owing to newly-generated solid-air-liquid interfaces. This work sheds positive insights into extending applications of Al alloys, especially in oceaneering fields.

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One-Step Preparation of Super-Hydrophobic Micro-Nano Dendrites on Al Alloy for Enhanced Corrosion Resistance

Metals ◽

10.3390/met8110960 ◽

2018 ◽

Vol 8 (11) ◽

pp. 960 ◽

Cited By ~ 4

Author(s):

Xuewu Li ◽

Tian Shi ◽

Ben Li ◽

Chuanwei Zhang ◽

Bin Zhong ◽

...

Keyword(s):

Corrosion Resistance ◽

Low Cost ◽

Hydrophobic Surface ◽

Al Alloys ◽

Al Alloy ◽

Ocean Engineering ◽

Acid Modification ◽

Sliding Angle ◽

Corrosion Failure ◽

One Step

Corrosion failure is a thorny issue that restricts the applications of Al alloys. As a research hotspot in functional realization, hydrophobic fabrication exactly offers an efficient method to settle metallic corrosions. This work has developed a facile and low-cost method to enhance corrosion resistance of Al alloys. The micro-nano dendrites have been firstly prepared on metallic substrate using one-step potentiostatic deposition. Then, wetting and electrochemical behaviors have been systematically investigated after stearic acid modification. Results show that the as-prepared surface possesses amplified and durable water repellence with an apparent contact angle (CA) of 154.2° and a sliding angle (SA) of 4.7°. Meanwhile, owing to the trapped air in dendrites, the newly-generated solid-air-liquid interfaces help to resist seawater penetration by reducing interfacial interactions on the super-hydrophobic surface as well as significantly enhance its corrosion resistance. This work sheds positive insights into extending the applications of Al alloys in many areas, especially for ocean engineering fields.

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

Micromachines ◽

10.3390/mi11020159 ◽

2020 ◽

Vol 11 (2) ◽

pp. 159 ◽

Cited By ~ 1

Author(s):

Xiaojuan Dong ◽

Jianbing Meng ◽

Yizhong Hu ◽

Xiuting Wei ◽

Xiaosheng Luan ◽

...

Keyword(s):

Contact Angle ◽

Corrosion Resistance ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Superhydrophobic Surface ◽

Al Alloy ◽

Alloy Sample ◽

Sliding Angle ◽

Water Contact ◽

Self Cleaning

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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Effects of the Duration of Potentiostatic Anodizing on the Corrosion Resistance and Surface Morphology of Films Formed on Mg-Al Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.486-487.125 ◽

2005 ◽

Vol 486-487 ◽

pp. 125-128 ◽

Cited By ~ 1

Author(s):

Seong Jong Kim ◽

Seok Ki Jang ◽

Jeong Il Kim

Keyword(s):

Corrosion Resistance ◽

Surface Morphology ◽

Anodic Oxide ◽

Al Alloys ◽

Anodic Film ◽

Al Alloy ◽

Active Dissolution ◽

Dissolution Reaction ◽

Alloy Az91 ◽

Morphology Of Films

The effects of the duration of potentiostatic anodizing on the corrosion resistance and surface morphology of anodic oxide films formed on Mg-Al alloy (AZ91) in 1 M NaOH were investigated. With the formation of an anodic film, the current density decreased gradually, started to stabilize at 300 s, and was relatively constant at 600 s. These results may be related to the increased time for catalysis of the active dissolution reaction, which not only enlarges the area covered by the anodic film, but also produces a more coherent, thicker film. The reference corrosion potentials of the anodic oxide film for AZ91 shifted in the noble direction with time. In general, the corrosion resistance characteristics were improved with anodizing time.

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Production of Electroconductive, Superhydrphobic and Flame-Retardant Cotton Fibers via Pad-Dry-Cure Process using Silicone Rubber and Ammonium Polyphosphate

10.21203/rs.3.rs-270637/v1 ◽

2021 ◽

Author(s):

Abdullah M. Al-Enizi ◽

Asma A. Alothman ◽

Mohd Ubaidullah ◽

Ayman Nafady

Keyword(s):

Flame Retardant ◽

Silicone Rubber ◽

Ammonium Polyphosphate ◽

Cotton Fibers ◽

Water Repellent ◽

Step Method ◽

Water Contact ◽

Car Seat ◽

One Step ◽

Blend Fabric

Abstract Although pyrovatex has been widely utilized as commercial flame-retardant material, the discharge of poisonous formaldehyde is still a major concern. On the other side, fluorine-based materials have been successfully used to impart superhydrophobic textile surfaces, but they are highly expensive and extremely toxic. Based on these challenging concerns, we report a simple one-step method for the production of flame-retardant and water-repellent coating onto an electroconductive cotton-nickel (Cot-Ni) blend fabric. Firstly, the electroconductive cotton was prepared by weaving nickel strip twisted around cotton core yarns, which were then weaved with pure cotton yarns to introduce Cot-Ni blend fabric. Secondly a composite comprising ammonium polyphosphate (APP) and room-temperature vulcanized silicone rubber (RTV) was applied onto the electroconductive cotton fabrics via one-step pad-dry-cure technique. Results showed that the flame-retardant effect of cotton was enhanced due to the high binding of RTV with both APP and cotton fibers. Thus, different concentrations of APP were implemented in the composite to establish that only 100 g/L of APP with RTV presented an improved fire-retardancy. The surface of Cot-Ni fabric displayed different hierarchical morphologies relying on the concentration of APP. Moreover, RTV further enhanced the superhydrphobic nature of cotton surface. Importantly, the superhydrophobic activity was characterized by static water contact angle of the coated Cot-Ni blend. The CIE Lab colorimetric measurements of the coated Cot-Ni blend were also explored. The comfort characteristics of the coated Cot-Ni blend were assessed by measuring their air permeability and stiffness. Ultimately, these multifunctional cotton-nickel (Cot-Ni)/RTV-APP treated fabrics could be suitable for diverse applications, including firefighters’ wear, car seat mats, and grain storage containers.

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Transparent superhydrophobic PTFE films via one-step aerosol assisted chemical vapor deposition

RSC Advances ◽

10.1039/c7ra04116k ◽

2017 ◽

Vol 7 (47) ◽

pp. 29275-29283 ◽

Cited By ~ 24

Author(s):

Aoyun Zhuang ◽

Ruijin Liao ◽

Sebastian C. Dixon ◽

Yao Lu ◽

Sanjayan Sathasivam ◽

...

Keyword(s):

Contact Angle ◽

Chemical Vapor Deposition ◽

Water Contact Angle ◽

Vapor Deposition ◽

Chemical Vapor ◽

Sliding Angle ◽

Water Contact ◽

Visible Transmittance ◽

One Step

Hierarchical micro/nano-structured transparent superhydrophobic polytetrafluoroethylene films with water contact angle 168°, water sliding angle <1° and visible transmittance >90% were prepared on glass via aerosol-assisted chemical vapor deposition.

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Study on corrosion resistance of superhydrophobic surface on aluminum alloy

Materials Express ◽

10.1166/mex.2021.2118 ◽

2021 ◽

Vol 11 (12) ◽

pp. 2004-2009

Author(s):

Ruomei Wu ◽

Shuai Wu ◽

Haiyun Jiang ◽

Zigong Chang ◽

Zhiqing Yuan ◽

...

Keyword(s):

Corrosion Resistance ◽

Aluminum Alloy ◽

Corrosion Potential ◽

Polypropylene Film ◽

Sliding Angle ◽

Water Contact ◽

Nano Structure ◽

Anode Oxidation ◽

The Relationship ◽

Aluminum Alloy Surface

Anti-corrosion of aluminum alloys with different roughness were researched in this study. To further verify the relationship between anti-corrosion and surface roughness, surface with micro structure alloy was successfully fabricated via anode oxidation on aluminum. The water contact angle of aluminum alloy surface after coating polypropylene film was 154° and sliding angle was 3°. The micro-nano structure was constructed by adding nano-SiO2. The contacts angle of surface was 165° and the sliding angle was 1.8°. The superhydrophobic samples were used to test corrosion resistance. Compared with aluminum coated with unmodified film, the corrosion potential for modified superhydrophobic aluminum alloy increased by about 0.05 V. When nano-SiO2 particles were added, the corrosion resistance for the sample was also improved.

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Superhydrophobic Al2O3–Polymer Composite Coating for Self-Cleaning Applications

Coatings ◽

10.3390/coatings11101162 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1162

Author(s):

Rajaram S. Sutar ◽

Saravanan Nagappan ◽

Appasaheb K. Bhosale ◽

Kishor Kumar Sadasivuni ◽

Kang-Hyun Park ◽

...

Keyword(s):

Composite Coating ◽

Research Work ◽

Water Repellency ◽

Dip Coating ◽

Industrial Applications ◽

Water Repellent ◽

Al2o3 Nanoparticles ◽

Sliding Angle ◽

Water Contact ◽

Self Cleaning

Superhydrophobic coatings have a huge impact in various applications due to their extreme water-repellent properties. The main novelty of the current research work lies in the development of cheap, stable, superhydrophobic and self-cleaning coatings with extreme water-repellency. In this work, a composite of hydrothermally synthesized alumina (Al2O3), polymethylhydrosiloxane (PMHS) and polystyrene (PS) was deposited on a glass surface by a dip-coating technique. The Al2O3 nanoparticles form a rough structure, and low-surface-energy PHMS enhances the water-repellent properties. The composite coating revealed a water contact angle (WCA) of 171 ± 2° and a sliding angle (SA) of 3°. In the chemical analysis, Al2p, Si2p, O1s, and C1s elements were detected in the XPS survey. The prepared coating showed a self-cleaning property through the rolling action of water drops. Such a type of coating could have various industrial applications in the future.

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Facile Fabrication of a Hierarchical Superhydrophobic Coating with Aluminate Coupling Agent Modified Kaolin

Journal of Nanomaterials ◽

10.1155/2013/497216 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5 ◽

Cited By ~ 5

Author(s):

Hui Li ◽

Mengnan Qu ◽

Zhe Sun ◽

Jinmei He ◽

Anning Zhou

Keyword(s):

Surface Modification ◽

Coupling Agent ◽

Cost Effective ◽

Surface Coatings ◽

Water Repellent ◽

Superhydrophobic Coating ◽

Sliding Angle ◽

Water Contact ◽

Facile Fabrication ◽

Large Water

A superhydrophobic coating was fabricated from the dispersion of unmodified kaolin particles and aluminate coupling agent in anhydrous ethanol. Through surface modification, water contact angle of the coating prepared by modified kaolin particles increased dramatically from 0° to 152°, and the sliding angle decreased from 90° to 3°. Scanning electron microscopy was used to examine the surface morphology. A structure composed of micro-nano hierarchical component, combined with the surface modification by aluminate coupling agent which reduced the surface energy greatly, was found to be responsible for the superhydrophobicity. The method adopted is relatively simple, facile, and cost-effective and can potentially be applied to large water-repellent surface coatings.

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Hydrophobization of epoxy nanocomposite surface with 1H,1H,2H,2H-perfluorooctyltrichlorosilane for superhydrophobic properties

Open Physics ◽

10.2478/s11534-012-0114-z ◽

2012 ◽

Vol 10 (5) ◽

Cited By ~ 6

Author(s):

Maciej Psarski ◽

Jacek Marczak ◽

Grzegorz Celichowski ◽

Grzegorz Sobieraj ◽

Konrad Gumowski ◽

...

Keyword(s):

Surface Treatment ◽

Contact Angles ◽

Alumina Nanoparticles ◽

Water Repellent ◽

Sliding Angle ◽

Water Contact ◽

Epoxy Nanocomposite ◽

Liquid Phases ◽

Modified Surfaces ◽

The Hierarchical Structure

AbstractNature inspires the design of synthetic materials with superhydrophobic properties, which can be used for applications ranging from self-cleaning surfaces to microfluidic devices. Their water repellent properties are due to hierarchical (micrometer- and nanometre-scale) surface morphological structures, either made of hydrophobic substances or hydrophobized by appropriate surface treatment. In this work, the efficiency of two surface treatment procedures, with a hydrophobic fluoropolymer, synthesized and deposited from 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS) is investigated. The procedures involved reactions from the gas and liquid phases of the PFOTS/hexane solutions. The hierarchical structure is created in an epoxy nanocomposite surface, by filling the resin with alumina nanoparticles and micron-sized glass beads and subsequent sandblasting with corundum microparticles. The chemical structure of the deposited fluoropolymer was examined using XPS spectroscopy. The topography of the modified surfaces was characterized using scanning electron microscopy (SEM), and atomic force microscopy (AFM). The hydrophobic properties of the modified surfaces were investigated by water contact and sliding angles measurements. The surfaces exhibited water contact angles of above 150° for both modification procedures, however only the gas phase modification provided the non-sticking behaviour of water droplets (sliding angle of 3°). The discrepancy is attributed to extra surface roughness provided by the latter procedure.

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A General Strategy towards Superhydrophobic Self-Cleaning and Anti-Corrosion Metallic Surfaces: An Example with Aluminum Alloy

Coatings ◽

10.3390/coatings11070788 ◽

2021 ◽

Vol 11 (7) ◽

pp. 788

Author(s):

Shunli Zheng ◽

Cheng Li ◽

Yupeng Zhang ◽

Tengfei Xiang ◽

Ying Cao ◽

...

Keyword(s):

Aluminum Alloy ◽

Hierarchical Structures ◽

Corrosion Current ◽

Al Alloy ◽

General Strategy ◽

Sliding Angle ◽

Water Contact ◽

Metallic Structures ◽

Humid Condition ◽

Self Cleaning

Corrosion and contamination of metallic structures can cause loss of their functionality as well as aesthetic values. In this study, we describe a general strategy to prepare superhydrophobic self-cleaning and anti-corrosion surfaces for metallic structures. As a specific example, a superhydrophobic coating (SHC) on aluminum alloy was prepared by a simple etching combined with the decoration of a low-surface-energy material. The optimal SHC has a water contact angle (CA) at ~157.4° and a sliding angle (SA) of ~8.3° due to the synergy of binary hierarchical structures and chemical modification. The SHC showed low adhesion to dry contaminants and a series of liquids, displaying a good self-cleaning effect. The SHC maintained superhydrophobicity after exposure to air and humid condition at 60 °C for 7 days. In addition, the electrochemical measurements reveal that the anti-corrosion performance was enhanced by reducing the corrosion current density (Jcorr) by 1 order of magnitude and increasing the corrosion potential (Ecorr) by 0.527 V as compared to the bare Al alloy substrate after immersion for 168 h.

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