Abstract
The purpose of this study is to improve the corrosion resistance and to examine the electrochemical behavior of Diamond-like carbon (DLC) films. DLC films were prepared by the ionization deposition method with different film thickness, in which benzene (C6H6) was used as precursor gas. The film thickness was changed from 106 to 637 nm and the bias voltage was applied at −1.0 and −2.0 kV. The electrochemical corrosion tests were performed by potentiodynamic anodic polarization, potentiostatic polarization and galvanostatic polarization techniques in 3 mass%NaCl aqueous solutions open to the air at 333 K. The corroded surfaces of DLC/Al after the galvanostatic polarization measurements were observed by a scanning electron microscope. We also examined the adhesion of films using a tensile pull-off tester. In this study, the influence of the preparation conditions on the corrosion resistance of DLC/Al are reported from a study of electrochemical properties. It is found that the corrosion resistance of DLC/Al samples is superior with decreasing film thickness. The corrosion resistance of DLC prepared at Vb=−2.0 kV is more superior to that at Vb=−1.0 kV with similar thickness. The adhesive strength of films is higher for the thinner films and this tendency correlated with the corrosion resistance by electrochemical tests.
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