Abstract
Diamond-like carbon (DLC) films were prepared by ionization deposition method in which benzene was used as precursor gas. The substrate used was austenitic 18Cr-8Ni stainless steel (JIS std. SUS 304). In this paper, the corrosion behavior of DLC films coated on SUS 304 stainless steel was studied from the viewpoint of the film thickness and negative bias voltage applied during film preparation. The corrosion resistance of DLC films was examined by electro-chemical polarization measurements. The corroded surfaces were observed by SEM. The area of pinhole defects in DLC films, denoted by Ri/2 (%), was estimated by the ratio of a critical passivation current density (/cm) for a coated and an uncoated stainless steel. Finally, excellent corrosion-protection ability of DLC coatings on SUS 304 stainless steel was achieved by the film thickness of 550 run prepared at the bias voltage of -2.0 kV with an Ri/2 value of approximately 0.01 %. This indicated that the intercepting effect of DLC coatings from the environment was superior to that of SiOz coatings with the similar thickness.
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