ELECTRODE PASSIVATION STUDIES
Abstract
Studies of the passivation of Zn and Zn-alloys in KOH at 30 C were made potentiostatically. Zinc shows the characteristic active-passive current- potential curve, although the passive current is too high for use in the passive reserve mode in Zn-AgO batteries. Studies of the corrosion of Co, Cu, Fe, Mg, Mn, and Ti in alkaline solutions show them as possible choices for alloying with Zn to improve its standby characteristics. Cu-Zn alloys are not acceptable however, since the addition of Cu lowers the Zn critical current but does not lower the passive current sufficiently. Zn-Mg solid solutions show the formation of an inactive surface layer and are therefore not suitable. Cu-plating of Zn may be suitable for its protection on standby. Studies of the passivation of Mg from pH 2 to 14 were carried out with a view toward using the high energy density characteristics of the Mg-m-dinitro-benzene battery. In neutral and alkaline solutions Mg is passive on open circuit and cannot be used in the passive reserve mode. A secondary passivation may be present in mildly acid fluoride solutions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1966
- Accession Number
- AD0484216
Entities
People
- A. C. Makrides
- J. Bradspies
- R. Marsh
- S. B. Brummer