Effects of plastic strain of diamond-like carbon coated stainless steel on the corrosion behavior in simulated body fluid environment

We have investigated the effect of plastic deformation of diamond-like carbon (DLC) coated and uncoated stainless steel on the corrosion resistance in a simulated body fluid environment to measure its protective efficiency as a biomedical coating material. We deposited the DLC film on 304 stainless...

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Bibliographic Details
Published in:Surface & coatings technology 2008-03, Vol.202 (12), p.2632-2637
Main Authors: Choi, Heon Woong, Lee, Kwang-Ryeol, Park, Se Jun, Wang, Rizhi, Kim, Jung-Gu, Oh, Kyu Hwan
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science
rheology
Diamond-like carbon (DLC)
Exact sciences and technology
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical stability
Metals. Metallurgy
Nonmetallic coatings
Physics
Potentiodynamic polarization test
Production techniques
Surface treatment
Surface treatments
Tensile test
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Summary:We have investigated the effect of plastic deformation of diamond-like carbon (DLC) coated and uncoated stainless steel on the corrosion resistance in a simulated body fluid environment to measure its protective efficiency as a biomedical coating material. We deposited the DLC film on 304 stainless steel specimens by radio frequency plasma assisted chemical vapor deposition(R.F.-PACVD) method, followed by a tensile test to apply plastic strain on the coated specimen. Corrosion behavior in the simulated body fluid environment was studied by a potentiodynamic polarization test. As the tensile deformation progressed, the cracks of the film were observed to be perpendicular to the tensile axis. Further deformation increased both cracking and the spallation. Estimated porosity and corrosion current density increased, and thus the protective efficiency decreased at a strain of 2%. In spite of the degradation, the anti-corrosion properties were significantly improved relative to the uncoated stainless steel. However, a significant increase in porosity and corrosion current density was observed at a strain of 4%. This study showed that increasing the thickness of the Si interlayer of film improved the corrosion resistance with reduction of spallations and cracks.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2007.09.046