Factors affecting the adhesion of electroless coatings

Bian

et al. 2015

Surface Engineering

Titanium dioxide (TiO 2 ) and graphite (C g ) particles were co-deposited with nickel-phosphorous (Ni-P) coatings through electroless deposition process. Surface morphology of the coatings was analysed by scanning electron microscope (SEM). X-ray diffraction (XRD) was used to detect the structure of the coatings. Microhardness of Ni-P-C g -TiO 2 composite coating showed a moderate hardness between Ni-P-C g and Ni-P-TiO 2 composite coating. DSC thermograms indicated that the thermostability of Ni-P coating could not be affected by TiO 2 and/or C g particles. Moreover, the friction coefficient and corrosion rate of Ni-P-TiO 2 composite coating could be decreased by the addition of graphite particles.

Section: Resultsmentioning

confidence: 99%

Structure and properties of Ni–P–graphite (C_g)–TiO₂ composite coating

Bian

et al. 2015

Surface Engineering

“…The mechanism of ENP involves the deposition of nickel onto a substrate without an electric current. The process starts by nucleation in catalytically sensitive areas on the substrate, before autocatalytically growing in an isotropic pattern. − A much desired uniform thickness regardless of recesses and bores is subsequently observed. To ensure adequate catalytic activity on the surface of the substrate, preplating treatment activities are often carried out with substances such as palladium (especially for metals like copper or materials with passive surfaces which lack catalytic properties such as ceramics , ).…”

Section: Overview Of Electroless Nickel Platingmentioning

confidence: 99%

On the Influence of Surfactant Incorporation during Electroless Nickel Plating

Nwosu

Davidson

Hindle

et al. 2012

Ind. Eng. Chem. Res.

The effects of surfactants on the dynamics and characteristics of plain and composite electroless nickel plating (ENP) are highlighted and discussed herein. An outline of the rudiments of surfactants and some underlying selection criteria is presented at the outset, before emphasis is laid on the salient benefits of introducing such external agents during the plating process. Evidence suggests that their influence on key coating characteristics such as the rate of deposition, structure, corrosion resistance, and the degree of second-phase particle incorporation into the nickel matrix is significant, and depending on the nature and concentration of surfactant employed, can be of immense value to the system.

“…The thickness of bipolar plates should not be lower than 1 mm to avoid plate deformation during the process. Durgasz et al 4 noted that the success or failure of the electroless plating process is based on the pretreatment action. Improper pretreatment may result in poor coat adhesion, roughness, and a porous surface.…”

Section: Introductionmentioning

confidence: 99%

The study on a new method of preparing PMMA forming composite bipolar plate

Chiou

2021

Sci Rep

The recent oil resource shortage has prompted the development of the proton exchange membrane fuel cell (PEMFC) system. PEMFC is a possible source of power that can be used in aircraft, household electricity, agriculture, fishing, motor vehicles, ships, submarines, bicycles, and other portable power systems in the future. This paper emphasizes the production of lightweight bipolar plates to solve several existing problems in the PEMFC system, including weight, cost, and integration. Conventional bipolar plates account for approximately 90% of the weight of battery packs. Therefore, an injection molded flow-field plate constructed from polymethylmethacrylate (PMMA) is developed herein to reduce the weight of the PEMFC system. Computer-aided engineering (CAE) mold flow analysis is then used to simulate the experimental design based on the finished products. Experimental analysis is also performed on the adhesion results of the plates. The results indicate that the establishment of the injection mold using CAE simulation improves mold development and reduces cost. Mechanical coarsening on the surface of the PMMA results in improved adhesion (> 50 N) at temperatures higher than 80 °C. Thus, mechanical coarsening is suitable for the PEMFC system. The problem of conventional weight is solved by reducing the weight by 70%.