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

SURFACE & COATINGS TECHNOLOGY

卷:204

Article

Marciano, F. R.^1,2  Almeida, E. C.¹  Lima-Oliveira, D. A.¹  Corat, E. J.^1,2  Trava-Airoldi, V. J.^1,2 

[1] Inst Nacl Pesquisas Espaciais, Lab Assoc Sensores & Mat, BR-12227010 Sao Jose Dos Campos, SP, Brazil

[2] CTA, ITA, BR-12228900 Sao Jose Dos Campos, SP, Brazil

关键词: Diamond-like carbon;    Diamond particles;    Electrochemical corrosion;   

DOI  :  10.1016/j.surfcoat.2010.02.014

来源: Elsevier

【 摘 要 】

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 mu m 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. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free