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Breakdown of cadmium passivity in alkaline solution

✍ Scribed by Prof. Dr. S. S. Abd El-Rehim; O. Abou El-Wafa; S. M. Abd El-Wahab; S. M. Rashwan

Publisher
John Wiley and Sons
Year
1992
Tongue
German
Weight
501 KB
Volume
43
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The electrochemical behaviour of a Cd anode was investigated in 0.05–2 M NaOH solutions by the potentiodynamic technique. The polarization curves exhibit active to passive transition prior to oxygen evolution. The threshold potential of the active dissolution is very close to the reversible potential of the system Cd/Cd(OH)~2~. X‐Ray diffraction and XPS measurements reveal that the passive layer is composed of both Cd(OH)~2~ and CdO. The influence of increasing amounts of Cl^βˆ’^, Br^βˆ’^ or I^βˆ’^ ions on the anodic behaviour of Cd in NaOH solution has been investigated. The halides stimulate the anodic dissolution in the active region and tend to break‐down the passive layer in the passive region, leading to pitting attack. The pitting potential shifts to more negative values with increasing halide ion concentration but to the reverse direction with increasing alkali concentration.

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