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Pinhole defects of TiN coated stainless steels were evaluated electrochemically in deaerated 0.5 kmol¥m-3 H2SO4 + 0.05 kmol¥m-3 KSCN solution at 298 K. The TiN films formed by an activated reactive evapolation method exhibited the columnar structure with <111> orientation, which contained more or less pinhole defects. The critical current density for passivation, icrit, in the TiN-coated stainless steels decreased with an increasing film thickness, and the resulting corrosion resistance was improved remarkably by TiNcoating. The area fraction of pinhole defects was evaluated by the ratio of i crit of a coated and a non-coated specimen. Thus, the result coincided well with the •etrue' area fraction based on the optical micrographs before or after polarized anodically. Consequently, such electrochemical measurement is superior as an evaluation method for the pinhole defects of corrosion-resistible coating.

Electrochemical Evaluation of Pinhole Defects in TiN-Coated Stainless Steels