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1
Content available remote Development of nanostructured anti-fouling coatings for hydro plant facilities
Grabowiecki Krzysztof, Krasucki Janusz, Buczko Zofia, Osuchowska Ewa, Olkowicz Klaudia
Journal of Power Technologies
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2021
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Vol. 101, nr 4
226--235
EN
The biofouling is a serious technical issue in hydropower facilities operating in a freshwater environment. The presented novel technology of antifouling coating integrates two functionalities of deposited material - biocidal features of copper and superhydrophobicity of the surface. The well-known, low cost copper electroplating process on the steel surface has been modified to achieve a hierarchical micro/nano scaled surface structure. The significantly reduced wettability of the coating surface in combination with biocidal activity of copper increases the surface resistance to biofouling. The influence of selected electroplating parameters in combination with the pretreatment of the substrate steel surface was investigated. The resulted coating surface was tested for durability under slurry flow conditions. Finally, the large component - the intake water filter of hydropower plant - was subject of field testing and was successfully tested for biofouling resistance.
2
Content available The Influence of Copper Powder Morphology on Mechanical Properties of Low-Pressure Cold Sprayed Coatings
Grygier Dominika, Rutkowska-Gorczyca Małgorzata, Winnicki Marcin G., Wojdat Tomasz
Archives of Metallurgy and Materials
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2021
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Vol. 66, iss. 2
573--580
EN
Thermal spraying methods are commonly used to regenerate damaged surface or change materials surface properties. One of the newest methods is cold spraying, where coating is deposited of material in the solid state. Therefore shape and size of the powder particles are very important parameters. The article presents the influence of copper powder morphology on mechanical properties of the coatings (adhesion, hardness, Young’s modulus) deposited with the Low Pressure Cold spraying method on the AA1350 aluminium alloy substrate. The coatings were deposited using two commercially available copper powders with spherical and dendritic morphology and granulation of -40+10 μm. The bond strength of coatings was determined with the pull off method, the hardness with the Vickers method at load of 2.94 N, while the Young’s modulus through measurement of nanoindentation. Microstructure of the coatings was analysed using the light and scanning electron microscopy (SEM). Shape of the powder influences mechanical properties of the coating significantly. The coatings deposited with dendritic powder had low mechanical properties, hardness of the 81 HV0.3 order and adhesion of about 4 MPa. However changing powder morphology to spherical increased hardness of the coating to 180 HV0.3 and adhesion to 38.5 MPa.
3
Content available remote Soldering aluminium to copper with the use of interlayers deposited by cold spraying
Wojdat T., Winnicki M., Rutkowska-Gorczyca M., Krupiński S., Kubica K.
Archives of Civil and Mechanical Engineering
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2016
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Vol. 16, no. 4
835--844
EN
The article presents the application of interlayers deposited by Low Pressure Cold Spraying (LPCS) in the soldering process. The problems concerning soft soldering of aluminium and copper were indicated and a solution with the use of metallic and composite interlayers was proposed. Wettability and spreadability tests with selected solders were performed to evaluate a solderability of various aluminium and copper LPCS coatings. Light and scanning microscopes were used to analyze solder dissimilar Al–Cu joints with previously deposited LPCS interlayer. What is more mechanical properties of the joints, e.g. microhardness and shear strength, were examined. Strength of the soldered Al–Cu joints with the LCPS interlayer highly depend on shape of powder used in spraying process. The joints with the interlayer sprayed with dendritic copper powder have low strength of about 20 MPa. However, the strength of soldered joints with the LPCS interlayer of spherical copper powder is significantly higher and amounts to 36.7 MPa.
4
Elektryczna przewodność elektrolitycznych powłok miedzianych, srebrnych i złotych
Buczko Z., Okurowski W., Jakubiak J.
Inżynieria Powierzchni
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2013
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nr 4
33-38
PL
Przedstawiono pomiary przewodności powierzchniowej elektrolitycznych powłok miedzianych, srebrnych i złotych. Do nakładania powłok stosowano różne typy roztworów z dodatkami stopowymi lub związkami organicznymi. Przewodność mierzono metodą mikrofalowego rezonatora wnękowego. Pomiary wykazały istotny wpływ na przewodność powierzchniową danego rodzaju powłoki z tego samego metalu, ale osadzanych w różnych warunkach.
EN
Electrical sheet conductivity measurements of electrolytic copper, silver and gold coatings are presented. Various types of electrolytes with different additives including alloying agents and organic compounds have been used for deposition of metal layers. Conductivity have been measured employing microwave dielectric resonator technique. The results revealed different sheet conductivity values for the same type of coatings but deposited in different conditions.
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