Online ISSN : 2186-2451
Print ISSN : 1344-3542
Influence of Water on Passivation of Zr in n-butanol Solution Containing Bun4NBr
Xiyun YANGJianfeng ZHANGShenghai YANGNiuchang OUYANG
ジャーナル オープンアクセス

2018 年 86 巻 4 号 p. 153-157


To understand the role of water on zirconium passivation in n-butanol solutions containing Bun4NBr, composition and corrosion properties of the passive film were studied using cyclic voltammetry, X-ray photoelectron and electrochemical impedance spectroscopy. Zirconium undergoes spontaneous passivation followed by pitting corrosion as a result of passivity breakdown by the aggressive attack of bromide anions. The passive film consists mainly of ZrO2, ZrO2·2H2O and a small amount of zirconium butoxide. The pitting potential shifts positively and pitting corrosion is seriously inhibited with the addition of a small amount of water. Water improves the pitting corrosion resistance of the passive film by changing the thickness and the relative ratio of OH/O2−. The result is helpful to electrosynthesize zirconium butoxide with high energy efficiency.

© 2018 The Electrochemical Society of Japan