Droplet Spreading and Wettability of Abrasive Processed Aluminum Alloy Surfaces

Кузнецов, Г. В.; Orlova, E.G.; Feoktistov, Dmitriy; Islamova, Anastasia; Zhuikov, A. V.

doi:10.1007/s12540-019-00310-6

Cited by 34 publications

(14 citation statements)

References 41 publications

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“…Those researches focus on asperities and roughness phenomena, although the effect of cracks is suggested. Cracks on 3% coating might provoke an effect of pinning and the presence of the partial slip-condition along the rough surfaces on the liquid, being the change in wettability of this coating dependent on roughness and the geometric shape of cracks, as found in [54]. Moreover, it has also been suggested that special geometrical microstructures, together with trapped air in the closed structures, as can happen in found cracks, whose geometry has not been studied, may lead even to superhydrophobic properties on a hydrophilic surface [55], although just a decrease of hydrophilicity can take place, as shown in Fig.…”

Section: Morphological and Surface Characterizationmentioning

confidence: 93%

Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

2021

Focus on Powder Coatings

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The effect of hydrophilic nanosilica additions on the (1e3% by wt.) mechanical performance of epoxy powder coatings after UV exposure was investigated in this study. The epoxy coatings were prepared by mixing a commercial epoxy powder with nanoparticles in a hot mixer, an alternative method that is simpler than extrusion. Powders were electrostatically applied on carbon steel and cured to obtain coatings. The epoxy-based coatings were exposed to a xenon lamp with an irradiance of 550 W$m À2 for 500 h. Chemical structure of coatings was characterized before and after xenon exposure, using an attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Glass transition temperature (T g ) was measured with differential scanning calorimetry (DSC). Mechanical and wear tests were performed in order to study the difference among the coatings without and with silica nanoparticles after UV exposure. Surface of the coatings was analyzed with scanning electron microscopy (SEM), as well as the wear tracks to assess the wear mechanism. Finally, aesthetic properties (gloss and color) were also evaluated. The results confirm that the use of SiO 2 nanoparticles in amounts up to 2% allows less chemical and physical degradation of the surfaces and better wear resistance than the plain epoxy coatings after xenon exposure was found for 1% coating.

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Section: Morphological and Surface Characterizationmentioning

confidence: 93%

Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

2021

Focus on Powder Coatings

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“…can be increased not only by improving its design and applied technology but also by upgrading processing methods of engineering surfaces of this equipment. Enhancement of wetting properties can provide lubrication and help to reduce wear and friction [1], intensify heat removal in cooling systems [2], increase the efficiency of collecting water droplets in the chamber of droplet catchers [3], etc. This is possible by applying a coating to a previously prepared surface or modifying the surface to obtain unique functional properties (e.g., corrosion-resistant, anti-icing, superhydrophobic, and self-cleaning [4][5][6][7][8]) by different methods, such as plasma spraying [9], chemical vapor deposition [10], laser irradiation [11], etching [12], and different polishing methods [13].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…After polishing, the samples are used as the raw part for subsequent modifications or reference samples. Polished surfaces are taken as conditionally smooth [1,29]. Herewith, the changes in the surface properties due to the effect of polishing mixtures, heating or melting of the samples of metals and alloys by mechanical friction, laser radiation are not taken into account.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…The surface roughness and chemical composition are known to affect the evaporation modes of a liquid droplet [33]. The following evaporation modes of a one-component liquid droplet from a solid were detected [19]: (1) an increase in the contact diameter with diminishing contact angle; (2) a constant contact diameter (contact line pinning) with diminishing contact angle; (3) a constant contact angle with diminishing contact diameter; and (4) both parameters diminish. For the case of distilled water droplet evaporation from heated copper and aluminum alloy surfaces, three modes (1, 2, and 4) were recorded [19,34].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Effect of mechanical polishing of aluminum alloy surfaces on wetting and droplet evaporation at constant and cyclically varying pressure in the chamber

et al. 2021

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Improving the mechanical polishing of engineering surfaces in terms of the wetting and droplet evaporation theories is important for increasing the efficiency of modern equipment. Depending on the function of engineering surfaces, the mechanical polishing allows changing the wetting, as well as the liquid droplet evaporation rates and modes. However, the prediction of the processes occurring at the liquid/gas/solid contact line becomes more complicated after modification of metal surfaces, as well as under changing the environmental conditions. This work focuses on the study of wetting and evaporation of liquid droplets from polished aluminum alloy surfaces at constant and cyclically varying pressure. Wetting and droplet evaporation are key processes in equipment of the thermal power industry, in particular, operating at constant and cyclically varying high pressure: water-water steam generators, water vapor separators, droplet catchers, etc. Therefore, we investigated droplet wetting and evaporation modes after mechanical processes of surfaces, including polishing by tumbling, satin finishing, grinding and polishing by disks and pastes. We determined the condition when polishing of aluminum alloy surfaces by these methods does not affect the wettability by liquid droplets. Moreover, we established the effect of constant and cyclically varying high pressure on the droplet evaporation rate and evaporation modes. The pressure was found not to affect the characteristics of water droplet evaporation under conditions of periodically varied pressure in the chamber from the atmospheric (0.1 MPa) to high (0.5, 1.0, 1.5, and 2.0 MPa) values.

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“…The adherend surface is mechanically or chemically treated to obtain the desired porosity and rough adherend surface morphology. Chemical treatments involve polishing, etching, anodizing and other special treatments such as plasma and laser techniques [9][10][11][12][13][14][15][16][17][18]. Studies have shown that a two-stage polarization process can increase surface porosity and roughness [19].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effects of Surface Energy and Topography on the Adhesive Bonding of Aluminum Alloy

Kang¹,

Choi²

2021

Korean J. Met. Mater.

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The bonding properties of adhesives are mainly affected by surface roughness, topography and chemical adsorption. In this paper, we studied the effects of surface pretreatment of Al 2024-T3 (bare) in terms of surface roughness, topography and surface free energy. Surface pre-treatment included solvent cleaning, FPL etching, PAA and CAA treatment. The surface energy and roughness of the aluminum surface were significantly increased by the anodizing treatment. Single lap shear and fatigue tests were performed to investigate bonding properties and durability. The evaluation revealed that the surface energy and surface roughness resulting from the aluminum surface treatment had a significant impact on bonding properties and durability. PAA treated surfaces had the highest bonding strength, and CAA treated surfaces had superior bonding retention performance in hot water or salt spray environments. The results of the fatigue test most clearly demonstrated how the surface pretreatment of the aluminum alloy differently affected bonding performance.

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Droplet Spreading and Wettability of Abrasive Processed Aluminum Alloy Surfaces

Cited by 34 publications

References 41 publications

Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

Performance of ultraviolet exposed epoxy powder coatings functionalized with silica by hot mixing

Effect of mechanical polishing of aluminum alloy surfaces on wetting and droplet evaporation at constant and cyclically varying pressure in the chamber

A Study on the Effects of Surface Energy and Topography on the Adhesive Bonding of Aluminum Alloy

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