scholarly journals Robust Super-Hydrophobic Coating Prepared by Electrochemical Surface Engineering for Corrosion Protection

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 452 ◽  
Author(s):  
Bi ◽  
Li ◽  
Zhao ◽  
Ran ◽  
Cao ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Surface Engineering ◽  
Electrochemical Etching ◽  
Electrochemical Anodization ◽  
Protection Mechanism ◽  
Hydrophobic Coatings ◽  
Wetting Properties ◽  
Hydrophobic Coating ◽  
Micro Arc Oxidation ◽  
Engineering Materials

Corrosion—reactions occuring between engineering materials and their environment—can cause material failure and catastrophic accidents, which have a serious impact on economic development and social stability. Recently, super-hydrophobic coatings have received much attention due to their effectiveness in preventing engineering materials from further corrosion. In this paper, basic principles of wetting properties and corrosion protection mechanism of super-hydrophobic coatings are introduced firstly. Secondly, the fabrication methods by electrochemical surface engineering—including electrochemical anodization, micro-arc oxidation, electrochemical etching, and deposition—are presented. Finally, the stabilities and future directions of super-hydrophobic coatings are discussed in order to promote the movement of such coatings into real-world applications. The objective of this review is to bring a brief overview of the recent progress in the fabrication of super-hydrophobic coatings by electrochemical surface methods for corrosion protection of engineering materials.

scholarly journals Superhydrophobic Sands for the Preservation and Purification of Water

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 151
Author(s):  
Yuyang Liu ◽  
Chang-Hwan Choi
Keyword(s):  
Water Surface ◽  
Particulate Material ◽  
Self Assembled Monolayer ◽  
Hydrophobic Coatings ◽  
Hydrophobic Coating ◽  
Evaporation Loss ◽  
Zno Nanocrystals ◽  
Sand Particles ◽  
Purification Of Water ◽  
Nanoscale Roughness

Sand, a cheap and naturally abundant particulate material, was modified with photocatalytic and hydrophobic coatings to reduce evaporation loss and facilitate the purification of water. The first-level photocatalytic coatings (TiO2 or ZnO nanocrystals) rendered nanoscale roughness on the surface of the sand. The additional second-level hydrophobic coating of a self-assembled monolayer of octyltrimethoxysilane (OTS) made the sand particles superhydrophobic because of the nanoscale roughness imposed by the nanocrystals. The superhydrophobic sand particles, floating on the free surface of water due to their superhydrophobicity, significantly reduced the evaporation loss of water by 60%–90% in comparison to an uncovered water surface. When the outer hydrophobic coatings are weathered or disengaged, the inner photocatalytic coatings become exposed to water. Then, the sand particles act as photocatalysts to degrade the contaminants in water under solar radiation.

scholarly journals Hard Quasicrystalline Coatings Deposited by HVOF Thermal Spray to Reduce Ice Accretion in Aero-Structures Components

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 290
Author(s):  
J. Mora ◽  
P. García ◽  
R. Muelas ◽  
A. Agüero
Keyword(s):  
Thermal Spray ◽  
Surface Engineering ◽  
High Hardness ◽  
Ceramic Materials ◽  
Ice Accretion ◽  
Adhesion Properties ◽  
Wetting Properties ◽  
Lap Shear ◽  
Hvof Thermal Spray ◽  
Ice Adhesion

Weather hazards, in particular icing conditions, are an important contributing factor in aviation accidents and incidents worldwide. Many different anti-icing strategies are currently being explored to find suitable long-lasting solutions, such as surface engineering, which can contribute to reduce ice accumulation. Quasicrystals (QCs) are metallic materials, but with similar properties to those of ceramic materials, such as low thermal and electrical conductivities, and high hardness. In particular, QCs that have low surface energy are commercially used as coatings to replace polytetrafluoroethylene (PTFE), also known as Teflon, on frying pans, as they do not scratch easily. PTFE exhibits excellent anti-wetting and anti-icing properties and therefore QCs appear as good candidates to be employed as ice-phobic coatings. Al-based QCs have been applied by High Velocity Oxyfuel (HVOF) thermal spray on typically used aeronautic materials, such as Ti and Al alloys, as well as steels. The coatings have been characterized and evaluated, including the measurement of hardness, roughness, wetting properties, ice accretion behavior in an icing wind tunnel (IWT), and ice adhesion by a double lap shear test. The coatings were studied, both as-deposited, as well as after grinding, in order to study the effect of the surface roughness and morphology on the ice accretion and adhesion properties. The QC coating was compared with PTFE and two polyurethane (PU)-based commercial paints, one of them known to have anti-icing properties, and the results indicate an ice accretion reduction relative to these two materials, and ice adhesion lower than bare AA6061-T6, or the PU paint in the ground version of one of the two QCs. Since the QC coatings are hard (GPa Vickers hardness > 5), a durable behavior is expected.

scholarly journals Corrosion protection mechanism of Ce4+/organic inhibitor for AA2024 in 3.5% NaCl

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 2227-2240 ◽  
Author(s):  
Mohamed Gobara ◽  
Ahmad Baraka ◽  
Robert Akid ◽  
Mahmoud Zorainy
Keyword(s):  
Corrosion Protection ◽  
Protection Mechanism ◽  
Organic Inhibitor

Proposed corrosion protection mechanism of Ce4+/ organic inhibitor for AA2024.

scholarly journals Ultra-thin self-healing vitrimer coatings for durable hydrophobicity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jingcheng Ma ◽  
Laura E. Porath ◽  
Md Farhadul Haque ◽  
Soumyadip Sett ◽  
Kazi Fazle Rabbi ◽  
...  
Keyword(s):  
Thin Film ◽  
Dip Coating ◽  
Self Healing ◽  
Hydrophobic Coatings ◽  
Hydrophobic Coating ◽  
Perfluorinated Compound ◽  
Hydrophobic Materials ◽  
The Matrix ◽  
Coating Durability ◽  
Protective Structures

AbstractDurable hydrophobic materials have attracted considerable interest in the last century. Currently, the most popular strategy to achieve hydrophobic coating durability is through the combination of a perfluoro-compound with a mechanically robust matrix to form a composite for coating protection. The matrix structure is typically large (thicker than 10 μm), difficult to scale to arbitrary materials, and incompatible with applications requiring nanoscale thickness such as heat transfer, water harvesting, and desalination. Here, we demonstrate durable hydrophobicity and superhydrophobicity with nanoscale-thick, perfluorinated compound-free polydimethylsiloxane vitrimers that are self-healing due to the exchange of network strands. The polydimethylsiloxane vitrimer thin film maintains excellent hydrophobicity and optical transparency after scratching, cutting, and indenting. We show that the polydimethylsiloxane vitrimer thin film can be deposited through scalable dip-coating on a variety of substrates. In contrast to previous work achieving thick durable hydrophobic coatings by passively stacking protective structures, this work presents a pathway to achieving ultra-thin (thinner than 100 nm) durable hydrophobic films.

scholarly journals Poly(phenylene methylene)-Based Coatings for Corrosion Protection: Replacement of Additives by Use of Copolymers

2019 ◽  
Vol 9 (17) ◽  
pp. 3551 ◽  
Author(s):  
D’Elia ◽  
Magni ◽  
Trasatti ◽  
Schweizer ◽  
Niederberger ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Corrosion ◽  
Side Chains ◽  
Hydrophobic Coating ◽  
Corrosion Studies ◽  
Proper Design ◽  
Common Problems ◽  
Hydrocarbon Polymer ◽  
Protection Of The Metal

Poly(phenylene methylene) (PPM) is a thermally stable, hydrophobic, fluorescent hydrocarbon polymer. Recently, blended PPM has been proposed as a valuable anti-corrosion coating material, and, in particular, rheological additives such as external plasticizers resulted crucial to prevent crack formation. Accordingly, to avoid common problems related to the use of external plasticizers, the development of PPM-related copolymer-based coatings containing n-octyloxy side chains and their anti-corrosion behavior were explored in this study. The aluminum alloy AA2024, widely employed for corrosion studies, was selected as a substrate, covered with a thin layer of a polybenzylsiloxane in order to improve adhesion between the underlying hydrophilic substrate and the top hydrophobic coating. Gratifyingly, coatings with those copolymers were free of bubbles and cracks. The n-octyloxy side-chains may be regarded to adopt the role of a bound plasticizer, as the glass transition temperature of the copolymers decreases with increasing content of alkoxy side-chains. Electrochemical corrosion tests on PPM-substituted coatings exhibited good corrosion protection of the metal surface towards a naturally aerated near-neutrally 3.5% wt.% NaCl neutral solution, providing comparable results to blended PPM formulations, previously reported. Hence, the application of rheological additives can be avoided by use of proper design copolymers.

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