Abstract
Pinhole of CVD, PVD ceramic film coated on stainless steel was evaluated, using electrochemical measurement in various electrolytes. Cosequently, ratio of active dissolution current of a coated and a non-coated specimen in 1N HCl+0.01M KSCN solution gave the most reliable evaluation of pinhole. Results obtained are summarized as follows: (1) The pinhole ratios evaluated by this method are reproducible accurately as the substrate exposed to the electrolyte through penetrated pinholes is activated in 1N HCl+0.01M KSCN solution immediately after immersion. (2) Fewer pinholes can be evaluated compared with pre-studied methods as the anodic current by ceramic film is small and active dissolution current at pinhole is larger than ordinary electrolytes.
