Journal
APPLIED SURFACE SCIENCE
Volume 240, Issue 1-4, Pages 441-451Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2004.07.013
Keywords
surface free energy; electroless; Ni-P; Ni-Cu-P; Ni-P-PTFE; Ni-Cu-P-PTFE
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Surface free energy of a solid surface gives a direct measure of intermolecular interactions at interfaces and has a strong influence on adsorption and adhesion behaviour. However few data are available for the surface free energies of electroless Ni-P based composition coatings. In this paper, the electroless Ni-P, Ni-P-surfactant, Ni-Cu-P, N-P-PTFE and M-Cu-P-PTFE composite coatings were prepared under various coating conditions. The chemical compositions, surface, morphology and thickness of the coatings were measured using an energy dispersive X-ray microanalysis (EDX), a scanning electron microscope (SEM) and a digital micrometer respectively. The contact angles of water, diiodomethane and ethylene glycol on the coatings were measured automatically using dataphysics OCA-20 contact angle analyser. The surface, free energy of the coatings and their components (e.g. dispersion, polar or acid/base portions) were calculated using various methods. The experimental results showed that the incorporation of surfactant or PTFE particles into Ni-P matrixes has a significant influence on the surface free energy of the coatings, while the incorporation of copper into Ni-P matrixes has no significant influence on the surface free energy of the coatings. (C) 2004 Elsevier B.V. All rights reserved.
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