Effect of Temperature on the Passivation of Zinc in Alkaline Solution

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  • YAMASHITA Tsugito
    Department of Electrochemistry, Farculty of Engineering, Yokohama National University
  • NONAKA Seiichi
    Department of Electrochemistry, Farculty of Engineering, Yokohama National University

Bibliographic Information

Other Title
  • アルカリ溶液中亜鉛の不働態化におよぼす温度の影響
  • 亜鉛の陽極挙動　Ｉ　　アルカリ溶液中亜鉛の不働態化に及ぼす温度の影響

Description

The effect of temperature on the anodic behavior of zinc has been studied under galvanostatic or potentiostatic condition in an aqueous KOH solution saturated with ZnO. Passivation time became longer as bath temperature was higher up to about 50°C and revealed a peak at the temperature. Temperature of the peak was shifted from 50 to 56°C by the increased current density. Passivation of zinc was scarcely influenced by the existence of Cl- in the bath. The anodic polarization curves indicated that the anodic dissolution of zinc was accelerated by raising the bath temperature. A dark film was formed on the anode in the low temperature range while the film became blue in the temperature above 50°C. From the results obtained, it was considered that the anodic process of zinc and the properties of the anodic film might be changed at about 50°C.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (12), 2287-2290, 1974-12-10

    The Chemical Society of Japan

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