Crystalline diamond particles into diamond-like carbon films: The influence of the particle sizes on the electrochemical corrosion resistance

✍ Scribed by F.R. Marciano; E.C. Almeida; D.A. Lima-Oliveira; E.J. Corat; V.J. Trava-Airoldi

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 717 KB
• Volume: 204
• Category: Article
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2010.02.014

✦ Synopsis

Crystalline diamond (CD) particles are incorporated into diamond-like carbon (DLC) films in order to prevent CD-DLC electrochemical corrosion. In this paper, the influence of the diamond particle sizes on the electrochemical corrosion resistance of CD-DLC films was investigated. The films were grown over 304 stainless steel using plasma enhanced chemical vapor deposition. CD particles with 4 nm, 250 nm, 500 nm and 2-3 µm in diameter were incorporated into DLC during the deposition process. The investigation of CD-DLC electrochemical corrosion behavior was performed using potentiodynamic method. The results show that both protection efficiency and impedance increase with the decrease of I D /I G ratio. It means the increase of sp 3 bonds in DLC films reduces its electrochemical corrosion, improving the electrochemical protection efficiency and the impedance. Our results pointed out that CD-DLC films are promising corrosion protective coatings in aggressive solutions.