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Citation: Zhou Guo-Ding, Zhang Guo-Qing, Tong Ru-Ting, Jin Shi-Xun, Cai Sheng-Min. Study of Passivation and Pitting Corrosion for Ni Electrode in Borax-Borate Solution[J]. Acta Physico-Chimica Sinica, ;1992, 8(03): 418-423. doi: 10.3866/PKU.WHXB19920326 shu

Study of Passivation and Pitting Corrosion for Ni Electrode in Borax-Borate Solution

1.
Shanghai Institute of Electric Power, Shanghai 200090; Department of Chemistry, Hebei Normal University; Department of Chemistry, Peking University

Received Date: 4 December 1990
Available Online: 15 June 1992

The passivation behavior and the pitting process at the fixed potentials for Ni electrode in Na_2SO_4-borax-borate buffer solution have been studied with alternating current(AC) impedance technique. For the passivation in the Cl~--free buffer solution the maximum of impedance moduli |Z| and the minimum of capacitances C_(dl) appeared at the potential of -0.2 V (vs. Hg/H ), because both the thickness of passive film and the rate of anodic dissolution increased with rising potential. As the pitting went on in the Cl~--containing buffer solutions at the fixed potentials, |Z| at low fretrations of 0.1, 0.05, 0.01 mol·L~(-1) and the fixed potentials of 0.2, 0.7, 0.7 V, respectively, are discussed.
- Ni electrode; Passivation; Pitting corrosion; Alternating Current impedance techniques; Borax-borate solution
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