Characterization of NiBP-graphite composite coatings deposited by dynamic chemical plating

Abstract

Purpose -This paper aims to coat ternary composite NiBP-graphite films by Dynamic Chemical Plating "DCP" technique with a growth rate of at least 5 m/h, which makes this technique a worthy candidate for production of composite films. Electroless nickel plating method can be used to deposit nickel-phosphorous and nickel-boron coatings on metals or plastic surface. However, restrictions such as toxicity, short lifetime of the plating-bath and limited plating rate have limited applications of conventional electroless processes. Design/methodology/approach -DCP is an alternative for producing metallic deposits on non-conductive materials and can be considered as a modified electroless coating process. Using a double-nozzle gun, two different solutions containing the precursors are sprayed simultaneously and separately onto the surface. With this technique, NiBP-graphite films are fabricated and their corrosion and tribological properties are investigated. Findings -With a film thickness of 2 m, tribological analysis confirms that these coatings have favorable anti-friction and anti-wear properties. Corrosion resistance of NiBP-graphite composite films was investigated, and it was found that graphite incorporation significantly enhances corrosion resistance of NiBP films. Originality/value -DCP is faster and simpler to perform compared to other electroless deposition techniques. Using a double-nozzle gun, metal salt solution and reducing agents are sprayed to the surface, forming a deposit. Previously, coatings such as Cu, Cu-graphite, Cu-PTFE, Ni-B-TiO2, Ni-P, Ni-B-P and Ni-B-Zn with favorable compactness and adherence by DCP were reported. In this paper, the authors report the application of the DCP technique for depositing NiBP-PTFE nanocomposite films.

Recent advances in electroless nickel‑boron coatings

“…Electroless nickel-boron-phosphorous was first developed in the 1980s, but it's been investigated with renewed interest in the 2010s [288][289][290][291][292]. In those ternary alloys, an increase of boron content is accompanied by an increase of hardness but a decrease in corrosion resistance [293].…”

Influence of operational parameters on the TiO2 photocatalytic degradation of Methylene blue

“…This proves that the absorption band of Mb was destroyed4 The pseudo-first-order decay of Methylene blue via direct photocatalysisilluminated at 365 nm 5 X-ray diffraction spectra of coatings from (a) the base and (b) fourth (containing PEG+P25) sols…”

“…Functional coatings are applied to change the surface properties of substrate such as corrosion resistance, [1][2][3] wear resistance, 4 optical properties, 5 electrical properties, 6 etc. Among them, titanium dioxide coatings are excellent for various applications such as corrosive-protective, white pigment, gas sensor and as photocatalyst.…”

A review on wear characterization of electrodeposited nickel matrix composites

“…Dynamic chemical plating, sol-gel procedures, these methods include electroless and electroforming processes, as well as electrodeposition. Numerous studies and investigations have been conducted on the impact of manufacturing criteria with respect to the morphological features, morphological characteristics, physical quality, toughness, corrosion resistance, and wear behaviour of Ni-based coatings in various deposition techniques, as well as their impacts on morphological characteristics, texture of the structure, toughness, wear corrosion resistant behaviour of Ni-based coatings [5]. It is generally known that composite coatings via electrodeposition are a cost-effective way to provide increased qualities of self-lubrication, resistance to abrasion, resistance to corrosion, and chemical resistance.…”