Accession Number : AD0480599

Title :   ELECTRODE PASSIVATION STUDIES.

Descriptive Note : Quarterly rept. no. 1, 1 Dec 65-28 Feb 66,

Corporate Author : TYCO LABS INC WALTHAM MA

Personal Author(s) : Brummer, S. B. ; Makrides, A. C. ; Bradspies, J.

Report Date : 28 FEB 1966

Pagination or Media Count : 41

Abstract : The possible operation of primary, reserve batteries in a passive mode is discussed. Anodic passivation of reactive metals, such as Zn, Fe, etc., occurs at critical currents which are of the order of 0.1 to 1 amp/sq cm. Passive anodes dissolve at current densities less by orders of magnitude than the critical current. An anode can be put into the passive state and maintained in this condition by an appropriate electrical pulse followed by a suitable connection to the positive battery electrode. Activation of the anode prior to use can be achieved by a cathodic electrical pulse which reduces the passive film. The activation time may be from a few milliseconds to seconds, depending on the magnitude of the cathodic pulse. The Fe and Fe-Cr systems have been examined as possible anodes in HClO4 solutions. Data on passivation of these systems suggest that a Fe (alloy)/acid electrolyte/PbO2 reserve battery could be operated in the passive mode. (Author)

Descriptors :   *ELECTRODES), (*PRIMARY BATTERIES, (*ANODES(ELECTROLYTIC CELL), PASSIVE SYSTEMS), IRON, IRON ALLOYS, LEAD COMPOUNDS, DIOXIDES, PERCHLORIC ACID, ELECTROLYTES, ELECTROCHEMISTRY, FILMS, OXIDATION, SULFURIC ACID, SOLUTIONS(MIXTURES), ZINC, CADMIUM, MAGNESIUM, CHROMIUM ALLOYS, BIBLIOGRAPHIES.

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE