Improvement of diamond-like carbon electrochemical corrosion resistance by addition of nanocrystalline diamond

Nanocrystalline diamond (NCD) particles increase diamond-like carbon (DLC) electrochemical corrosion resistance, which is evidenced by (a) a shifting of the polarization curve towards the region of lower current density and higher potential, and (b) the superior impedance of NCD–DLC films in compari...

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Bibliographic Details
Published in:Journal of colloid and interface science 2010-02, Vol.342 (2), p.636-637
Main Authors: Marciano, F.R., Almeida, E.C., Bonetti, L.F., Corat, E.J., Trava-Airoldi, V.J.
Format: Article
Language:English
Subjects:
Anodic
Austenitic stainless steels
Chemistry
Colloidal state and disperse state
Corrosion resistance
Deposition
Diamond-like carbon
Diamond-like carbon films
Electrochemical corrosion
Electrochemistry
Exact sciences and technology
General and physical chemistry
Nanocrystalline diamond
Nanocrystals
Polarization
Surface physical chemistry
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Summary:Nanocrystalline diamond (NCD) particles increase diamond-like carbon (DLC) electrochemical corrosion resistance, which is evidenced by (a) a shifting of the polarization curve towards the region of lower current density and higher potential, and (b) the superior impedance of NCD–DLC films in comparison to the pure DLC and the stainless steel. Nanocrystalline diamond (NCD) particles were incorporated into diamond-like carbon (DLC) films in order to investigate NCD–DLC electrochemical corrosion resistance. The films were grown over 304 stainless steel using plasma-enhanced chemical vapor deposition. NCD particles were incorporated into DLC during the deposition process. The investigation of NCD–DLC electrochemical corrosion behavior was performed using potentiodynamic polarization against NaCl. NCD–DLC films presented more negative corrosion potential and lower anodic and cathodic current densities. The electrochemical analysis indicated that NCD–DLC films present superior impedance and polarization resistance compared to the pure DLC, which indicate that they are promising corrosion protective coatings in aggressive solutions.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2009.11.023