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2021 Fiscal Year Final Research Report

Application of Concentrated Aqueous Solutions for Highly-efficient Anodic Dissolution of Metals

Research Project

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Project/Area Number 20K22462
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Adachi Ken  東北大学, 多元物質科学研究所, 助教 (10880057)

Project Period (FY) 2020-09-11 – 2022-03-31
Keywordsクロムめっき / 濃厚水溶液 / アノード溶解 / 電気化学
Outline of Final Research Achievements

The anodic dissolution behavior of chromium metal in concentrated aqueous chloride baths was investigated. We worked on the development of an electrolyte that suppresses passivation of the electrode and enables highly efficient anodic dissolution, and combined it with chromium electrodeposition at the cathode as a counter reaction, we aimed to construct an advanced new electrodeposition process using concentrated aqueous solutions.
It was confirmed that anodic dissolution is possible in concentrated chloride baths due to the destabilization of the surface film. The valence of the dissolved ions is considered to be divalent and trivalent. Chromium metal is electrochemically inert in ordinary dilute aqueous solutions, but it can be used as a soluble anode in concentrated chloride baths.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

金属クロムは不動態化皮膜のために水溶液中では電気化学的に不活性であり、アノードとして使用することはこれまで不可能であった。金属クロムめっきプロセスのアノードとしては、浴分解をアノード反応とする不溶性のカーボンやチタンなどの電極が用いられており、高いセル電圧のために電力源単位が高いという課題を抱えていた。本研究で示された可溶性の金属クロムアノードの使用可能性はこれらの課題を解決し得ると考えられ、濃厚塩化物浴のもう一つの特徴である、3価クロムを用いた金属クロムめっきが可能であることと組み合わせることで、環境負荷の小さいクロムめっきプロセスの構築が期待される。

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Published: 2023-01-30  

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