Wettability, Microhardness, Wear and Corrosion Resistance of Ni–Co–P–BN(h)–Al2O3 Binary Nanocomposite Coatings Surface with Varying Long-Pulse Laser Parameters

Abstract

In this study, Ni–Co–P–BN(h)–Al2O3 binary nanocomposite coatings were fabricated on steel C1045 substrates by jet electrodeposition. The samples were then processed using self-made laser processing equipment to investigate the influence of long-pulse laser processing parameters variation on samples’ surface morphology, roughness and wettability. Additionally, the properties of samples before and after laser processing were analyzed and characterized. The results showed that the surface morphologies, surface roughness and wettability of samples were affected by laser output power, pulse width and spot-to-spot distance variation. A convex dome was formed on the samples’ surface at a low laser output power and a suitable pulse width, while a dimple was formed on the samples’ surface at a high laser output power. The surface roughness and water contact angle of samples increased with the rise in laser output power or pulse width. The water contact angle decreased with the rise in the spot-to-spot distance, and the water contact angle reached a maximum value of 139.8° with a laser output power of 50 W, a pulse width of 100 µs and a spot-to-spot distance of 150 µm. The samples after laser processing exhibited a higher wettability, microhardness and wear resistance compared to those of the normal samples. The microhardness of the heat-affected zone reached a maximum value of 812.1 HV0.1, and the wear scar width of the samples reached a minimum value of 360.5 µm. However, after laser processing, the samples’ seawater corrosion resistance decreased slightly.

Fabrication of Nanocomposite Coatings and Application in Outdoor Architectural Design

“…Application of Nano silica in architectural coatings Nano silica is an amorphous white powder. Its surface has unsaturated residual bonds and different hydroxyl groups, and its molecular state is a ternary chain [13]. Normally, the hydrogen bonds formed on the surface of nanoparticles do not generate large forces and are easily separated by shear forces.…”

Effect of Versenium Hydrogensulfate on Properties of Nickel Coatings

“…However, the corrosion resistance of the surface plated from bath IV was slightly lower because this surface was characterized by a lower hydrophobicity compared with the coating from bath II. An increase in the hydrophobicity of the surface of various metals (for example, Cu and Ni) was shown to improve the corrosion resistance of these materials as a result of reduced wettability with water [9,[34][35][36]. Thus, it could be expected that Ni-coated elements from bath IV would be more susceptible to corrosion than the coatings plated from bath II.…”

Enhanced mechanical properties and corrosion resistance of electro-deposited NiCoP composite coatings with ZrB2 particle addition

“…With the increasing demand for protective coatings used in harsh working conditions, the co-deposition of second-phase particles into the nickel-based coatings provides a viable route to enhance the corrosion and tribological properties of the composite coatings [28][29][30]. These second-phase particles can be hard particles, such as Si 3 N 4 [31], Al 2 O 3 [32], TiO 2 [33], CeO 2 [34], SiO 2 [35] and SiC [36,37], which would enhance the wear resistance of nickel-based coatings. The reinforcements can either be lubricant particles, including MoS 2 [28], carbon nanotube [38], graphite [39], graphite oxide [37] et al which would decrease the friction coefficient of the composite coatings.…”