Investigation of wettability of copper plate with nickel-graphene oxide coating produced by electroplating method

A comparative study of surface properties of Urtica dioica (nettle) leaves, roots, and seeds and examination of their ability to separate xylene isomers

“…An important feature of plants is that they have a chemical composition with a relatively easily accessible large amount of hydroxyl or carboxyl groups 1 . The properties including adhesion, dispersion stability, wettability, adsorptive properties, and composite formation of these materials are closely related to such functional groups in their structures 2,3 . In addition to functional groups, surface properties such as surface free energy and acidity‐basicity constants are also important in terms of examining and developing these properties 4,5 …”

“…composite formation of these materials are closely related to such functional groups in their structures. 2,3 In addition to functional groups, surface properties such as surface free energy and aciditybasicity constants are also important in terms of examining and developing these properties. 4,5 The surface energy is a combination of dispersive components (Van der Waals forces, etc.)…”

Laser Cladding Fe/FeCr Coatings on Continuous Casting Cu Mold

“…Copper aluminide, nickel aluminide, hard chromium, electroless nickel–phosphorus, and thermal sprayed cobalt–tungsten carbide were applied on the surface of copper substrates and their frictional behavior was examined. [ 3,4 ] The copper aluminide coating showed a smaller friction coefficient than pure copper, while other coatings showed an even higher coefficient. The surface of the copper plate was coated with nickel and graphene oxide by the electroplating method.…”

“…The surface of the copper mold coming in contact with the hot liquid metal is often coated with chromium or nickel to provide a harder working surface and to avoid copper pickup on the surface of the cast strand. Several surface-hardening coating techniques, such as electroplating [3,4] and thermal spraying, [4,5] are adopted in previous studies. Copper aluminide, nickel aluminide, hard chromium, electroless nickel-phosphorus, and thermal sprayed cobalt-tungsten carbide were applied on the surface of copper substrates and their frictional behavior was examined.…”

“…The friction coefficient was significantly decreased with the nickel and graphene oxide coating. [3,4] The heating and cooling circulation underwent by the mold during the initial and final stages of the casting sequence produce large thermal-misfit stress between the Cu substrate and coatings. As a result, electroplated Cr coating was easily cracked due to the deposition procedure, and those cracks propagated due to the thermal stresses accumulated in the mold's working process.…”