Dissolution Behaviors of Copper Metal in Alkaline H2O2-EDTA Solutions.

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概要

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• The dissolution behavior of Cu metal in hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>)-ethylenediaminetetraacetic acid (EDTA) solution was studied through both electrochemical and chemical tests. In the electrochemical experiments, the open circuit potential (OCP) of Cu electrode at low H<SUB>2</SUB>O<SUB>2</SUB> concentration below 0.5 wt% was determined by Cu anodic reaction and H<SUB>2</SUB>O<SUB>2</SUB> cathodic reaction. On the other hand, the OCP in higher concentration above 2 wt% of H<SUB>2</SUB>O<SUB>2</SUB> approached to 70 mV vs. SCE, since the redox reaction of H<SUB>2</SUB>O<SUB>2</SUB> was so dominant reaction that the Cu anodic reaction was masked. The anodic polarization curve of Cu around the OCP of 70 mV in the range between -200 and 200 mV in the solution without H<SUB>2</SUB>O<SUB>2</SUB> showed the maximum Cu dissolution reaction front, while those of both carbon steel and Inconel 600 in the same potential range were situated in the passivation region. The anodic polarization behaviors of Cu in the H<SUB>2</SUB>O<SUB>2</SUB> concentrations above 1 wt% were examined by a potentiostatic method along with a weight loss measurement. The anodic Cu dissolution current estimated from the weight loss measurement in the solution containing more than 1 wt% of H<SUB>2</SUB>O<SUB>2</SUB> was higher than that predicted by the polarization curve of Cu in the H<SUB>2</SUB>O<SUB>2</SUB>-free solution. The dissolution reaction rate of Cu in the H<SUB>2</SUB>O<SUB>2</SUB> solution linearly increased with H<SUB>2</SUB>O<SUB>2</SUB> concentration. This result indicated that the dissolution reaction rate of Cu in the presence of H<SUB>2</SUB>O<SUB>2</SUB> was enhanced by a reaction between Cu and H<SUB>2</SUB>O<SUB>2</SUB>, resulting in the shift of the polarization curves depending on H<SUB>2</SUB>O<SUB>2</SUB> concentration. The experimental correlation equation based on the above results described well the overall dissolution reaction rate of Cu in H<SUB>2</SUB>O<SUB>2</SUB> concentration ranges below 1 wt% and above 2 wt% in the EDTA solution.

• 一般社団法人 日本原子力学会の論文

著者

• OH Won

  Department of Decontamination and Decommissioning, Korea Atomic Energy Research Institute

• Woo Seong

  Department Of Chemical Engineering Korea Advanced Institute Of Science And Technology

• CHOI Wang

  Department of Decontamination, Korea Atomic Energy Research Institute

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