Monolayered versus multilayered electroless NiP coatings: Impact of the plating approach on the microstructure, mechanical and corrosion properties of the coatings

Salicio-Paz, Asier; Grande, Hans‐Jürgen; Pellicer, Eva; Sort, Jordi; Fornell, Jordina; Offoiach, Ruben; Lekka, Maria; García-Lecina, Eva

doi:10.1016/j.surfcoat.2019.04.013

Cited by 42 publications

(10 citation statements)

References 24 publications

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“…The calculated larger cell parameter compared to the tabulated one (a = 3.8898 Å) can be attributed to the incorporation of P, which has a smaller atomic radius than Pd [ 31 ], into interstitial positions of the fcc-Pd lattice. This cell expansion has been observed in other electroless metallic coatings like NiP [ 32 ]. The PU did not give any detectable response, which means that it is basically amorphous.…”

Section: Resultssupporting

confidence: 74%

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

Careta

Salicio-Paz

Pellicer

et al. 2021

IJMS

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Three-dimensional porous scaffolds offer some advantages over conventional treatments for bone tissue engineering. Amongst all non-bioresorbable scaffolds, biocompatible metallic scaffolds are preferred over ceramic and polymeric scaffolds, as they can be used as electrodes with different electric field intensities (or voltages) for electric stimulation (ES). In the present work we have used a palladium-coated polymeric scaffold, generated by electroless deposition, as a bipolar electrode to electrically stimulate human osteoblast-like Saos-2 cells. Cells grown on palladium-coated polyurethane foams under ES presented higher proliferation than cells grown on foams without ES for up to 14 days. In addition, cells grown in both conditions were well adhered, with a flat appearance and a typical actin cytoskeleton distribution. However, after 28 days in culture, cells without ES were filling the entire structure, while cells under ES appeared rounded and not well adhered, a sign of cell death onset. Regarding osteoblast differentiation, ES seems to enhance the expression of early expressed genes. The results suggest that palladium-coated polyurethane foams may be good candidates for osteoblast scaffolds and demonstrate that ES enhances osteoblast proliferation up to 14 days and upregulate expression genes related to extracellular matrix formation.

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Section: Resultssupporting

confidence: 74%

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

Careta

Salicio-Paz

Pellicer

et al. 2021

IJMS

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“… 43 Upon heat treatment, a further increase in the coatings’ hardness is observed, as shown in Table 4 , possibly due to the precipitation of the hard Ni 3 P (indicated by the XRD pattern after heat treatment ( Figure 1 b)). Commonly, various studies 40 , 44 have reported the effective increase in the hardness of the NiP and NiP composite coatings after heat treatment upon the formation of the Ni 3 P phase. It is worth mentioning that, as shown in Table 4 and Figure 7 , there is an agreement between the results of nanoindentation hardness and Vickers’ microhardness measurements in regard to the pattern and values of microhardness results.…”

Section: Resultsmentioning

confidence: 99%

ZnO-Doped gC₃N₄Nanocapsules for Enhancing the Performance of Electroless NiP Coating─Mechanical, Corrosion Protection, and Antibacterial Properties

et al. 2023

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A carbon nitride (C3N4) nanomaterial has superior mechanical, thermal, and tribological properties, which make them attractive for various applications, including corrosion-resistant coatings. In this research, newly synthesized C3N4 nanocapsules with different concentrations (0.5, 1.0, and 2.0 wt %) of ZnO as a dopant were incorporated into the NiP coating using an electroless deposition technique. The nanocomposite coatings either ZnO-doped (NiP-C3N4/ZnO) or undoped (NiP-C3N4) were heat-treated at 400 °C for 1 h. The as-plated and heat-treated (HT) nanocomposite coatings were characterized by their morphology, phases, roughness, wettability, hardness, corrosion protection, and antibacterial properties. The results indicated that the microhardness of as-plated and heat-treated nanocomposite coatings was significantly improved after the incorporation of 0.5 wt % ZnO-doped C3N4 nanocapsules. The outcomes of electrochemical studies revealed that the corrosion resistance of the HT coatings is higher than the corresponding as-plated ones. The highest corrosion resistance is achieved on the heat-treated NiP-C3N4/1.0 wt % ZnO coatings. Although the presence of ZnO in the C3N4 nanocapsules increased its surface area and porosity, the C3N4/ZnO nanocapsules prevented localized corrosion by filling the microdefects and pores of the NiP matrix. Furthermore, the colony-counting method used to evaluate the antibacterial behavior of the different coatings demonstrated superior antibacterial properties, namely, after heat treatment. Therefore, the novel perspective C3N4/ZnO nanocapsules can be utilized as a reinforcement nanomaterial in improving the mechanical and anticorrosion performance of NiP coatings in chloride media, together with providing superior antibacterial properties.

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“…1,20 It is to be noted here that addition of an interface may actually modify (improve) the mechanical properties of EN coating. 21 Now, the present samples for tribological tests are subjected to double bath deposition to have higher coating thickness in apprehension that the coating may get worn out totally during the tests. Roughly, it is found that the individual layers contribute around 20 µm of deposition thickness.…”

Section: Resultsmentioning

confidence: 99%

Oxidation issues during heat treatment and effect on the tribo-mechanical performance of electroless Ni-P–Cu deposits

Biswas

Das

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present work attempts to study the issues associated with heat treatment of electroless Ni–P–Cu coatings particularly with respect to oxidation and observe their impact on the hardness (micro- and nano-indentation), friction, and wear behavior of the coatings. Electroless Ni–P–Cu coating is deposited on low carbon steel substrates and subjected to heat treatment at temperatures ranging between 400°C and 800°C and for durations of 1 h and 4 h. Additionally, scratch tests are conducted on the coatings to evaluate their abrasion resistance as well as observe the influence of heat treatment conditions on the adhesion of the coatings. The changes in the microstructure of the coatings are suitably captured with various characterization tools, namely, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. It is seen that above a heat treatment temperature of 450°C, oxidation of the coating is prominent. Moreover, diffusion of iron from the substrate leads to the formation of intermetallic compounds. The coating performs well when heat-treated around 400°C–450°C. Above 600°C, the performance of the coating degrades with unnecessary oxide formation and other associated phenomena, namely, grain coarsening, flaking, and so on.

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Monolayered versus multilayered electroless NiP coatings: Impact of the plating approach on the microstructure, mechanical and corrosion properties of the coatings

Cited by 42 publications

References 24 publications

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

ZnO-Doped gC₃N₄Nanocapsules for Enhancing the Performance of Electroless NiP Coating─Mechanical, Corrosion Protection, and Antibacterial Properties

Oxidation issues during heat treatment and effect on the tribo-mechanical performance of electroless Ni-P–Cu deposits

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Monolayered versus multilayered electroless NiP coatings: Impact of the plating approach on the microstructure, mechanical and corrosion properties of the coatings

Cited by 42 publications

References 24 publications

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

Electroless Palladium-Coated Polymer Scaffolds for Electrical Stimulation of Osteoblast-Like Saos-2 Cells

ZnO-Doped gC3N4Nanocapsules for Enhancing the Performance of Electroless NiP Coating─Mechanical, Corrosion Protection, and Antibacterial Properties

Oxidation issues during heat treatment and effect on the tribo-mechanical performance of electroless Ni-P–Cu deposits

Contact Info

Product

Resources

About

ZnO-Doped gC₃N₄Nanocapsules for Enhancing the Performance of Electroless NiP Coating─Mechanical, Corrosion Protection, and Antibacterial Properties