Electroless Nanocomposite Coatings: Synthesis, Characteristics, and Applications

T.S.N., Sankara Narayanan; Seshadri, S.K.; Park, Il Song; Lee, Min Ho

doi:10.1007/978-3-319-15266-0_48

Cited by 4 publications

(2 citation statements)

References 50 publications

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“…However, LCs are highly susceptible to ion production under electrical stimulation, and these ions affect the performance of the devices in different ways and interfere with the dispersion stability of NPs in LCs, which greatly limits 184 . Copyright 2019, Wiley Online Library the lifetime of relevant devices [188][189][190][191][192][193] . Therefore, mature light protection devices for LCs should have high UV radiation tolerance and electrochemical stability.…”

Section: Discussionmentioning

confidence: 99%

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Zhang

Han

et al. 2023

Light Sci Appl

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With the development of optical technologies, transparent materials that provide protection from light have received considerable attention from scholars. As important channels for external light, windows play a vital role in the regulation of light in buildings, vehicles, and aircrafts. There is a need for windows with switchable optical properties to prevent or attenuate damage or interference to the human eye and light-sensitive instruments by inappropriate optical radiation. In this context, liquid crystals (LCs), owing to their rich responsiveness and unique optical properties, have been considered among the best candidates for advanced light protection materials. In this review, we provide an overview of advances in research on LC-based methods for protection against light. First, we introduce the characteristics of different light sources and their protection requirements. Second, we introduce several classes of light modulation principles based on liquid crystal materials and demonstrate the feasibility of using them for light protection. In addition, we discuss current light protection strategies based on liquid crystal materials for different applications. Finally, we discuss the problems and shortcomings of current strategies. We propose several suggestions for the development of liquid crystal materials in the field of light protection.

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Section: Discussionmentioning

confidence: 99%

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Zhang

Han

et al. 2023

Light Sci Appl

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“…Advanced Materials and Technologies for Defense II hard particle formation can shrink the Ni-P matrix, causing crack formation and reducing the anticorrosion properties of the coating [5].…”

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confidence: 99%

Hard Chrome Replacement with Cirrus Doped Electroless Nickel Coatings

Tay¹,

Jadhav²,

Goode³

2021

KEM

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The intrinsic hardness, high abrasive wear resistance, and corrosion properties of hard chrome coatings have resulted in their wide industrial application. However, chrome plating involves hazards associated with chrome 6+ which affect human health and drive the need to identify viable alternatives. This study investigated the addition of Cirrus alumina Dopant™ to a low phosphorus electroless nickel bath to evaluate the performance of the resulting nanocomposite coating as a potential replacement for hard chrome. A comprehensive comparison for the performance of coatings for alumina doped electroless nickel and a pure low electroless nickel coating were investigated. Results showed that Cirrus doped electroless nickel possessed a minimum hardness of 850HV0.1, high corrosion resistance, excellent abrasive wear resistance, and a Taber Wear Index of 2.25mg/1000 cycles. These attributes suggest Cirrus Dopant™ for electroless nickel may offer an outstanding candidate to replace hard chrome coatings in many applications.

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Influence of Deposition Temperature and WC Concentration on the Microstructure of Electroless Ni-P-WC Nanocomposite Coatings with Improved Hardness and Corrosion Resistance

Pedrizzetti,

Genova,

Bellacci

et al. 2024

Coatings

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This study aims to develop Ni-P coatings with high P content (≥11 wt.%) reinforced with WC nanoparticles on F22 steel substrates. The introduction of conductive WC in the plating solution dramatically increases reactivity of the plating solution, and consequently a tuning of deposition parameters, in terms of temperature and WC concentration, is required to obtain nanocomposite coatings with improved mechanical properties. The coatings’ porosity and incorporation and dispersion of the reinforcing phase as a function of temperature and WC concentration were analyzed by quantitative image analysis from Scanning Electron Microscopy (SEM) micrographs. Increasing the temperature and concentration of nanoparticles leads to a faster plating rate and a dramatic increase in both porosity and agglomeration of the reinforcing phase, with detrimental effects on the coatings’ microhardness. The best compromise between coating parameters was obtained by deposition at 70 °C and 6.5 g/L of WC, with a plating rate ≈ 12 μm/h, porosity lower than 1.5%, and a good combination between particle incorporation and agglomeration. In these conditions, a hardness increase by 34% is achieved in comparison to standard Ni-P. Coatings were then heat treated in air at 200 °C for 2 h, to induce growing stress relaxation, or 400 °C for 1 h, to study effects of crystallization and precipitation. X-Ray Diffraction (XRD) analysis demonstrated that WC introduction does not alter the microstructure of Ni-P coatings, but delays grain growth coarsening of precipitates. Hardness improvement by 6.5% and 45% is registered after treatment at 200 °C and 400 °C, respectively. An increase in elastic modulus, measured by instrumented indentation, was found in WC-reinforced coatings compared with Ni-P. Potentiodynamic polarization tests revealed that both introduction of WC nanoparticles and heat treatment also enhance corrosion resistance.

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Electroless Nanocomposite Coatings: Synthesis, Characteristics, and Applications

Cited by 4 publications

References 50 publications

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Advanced liquid crystal-based switchable optical devices for light protection applications: principles and strategies

Hard Chrome Replacement with Cirrus Doped Electroless Nickel Coatings

Influence of Deposition Temperature and WC Concentration on the Microstructure of Electroless Ni-P-WC Nanocomposite Coatings with Improved Hardness and Corrosion Resistance

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