In-situイメージングCFDEによるアノード分極中における銅の溶解電流および溶解面積の解析

抄録

An in-situ imaging channel flow double electrode（CFDE）was used to investigate the dissolution current and dissolution area of copper during anodic polarization. The CFDE is a useful method to investigate the anodic dissolution mechanisms of various metals and alloys because the oxidation state of the metal ions dissolved from the metal working electrode（WE）can be detected by arranging a detecting electrode（DE）downstream of the WE. In-situ imaging CFDE provides video recording of the WE surface during measurement of the anodic current of WE and the detection current related to the oxidation or reduction of metal ions at DE. For this study, the copper and glassy carbon were used, respectively, as the WE and the DE. Video images of the WE surface during anodic polarization revealed that initiation of the dissolution site on the copper surface corresponded to the increase of the anodic current in the polarization curve and that the dissolution site area increased with increasing polarization potential. The detection current associated with oxidation of cuprous ions to cupric ions was measured at DE when the dissolution site was observed on the copper surface. The dissolution current of cuprous ions increased with increasing area of the dissolution site. Results confirmed that the increase of the dissolution current of cuprous ions is correlated with the increase of the dissolution area on the copper surface during anodic polarization.