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ELECTRODE PASSIVATION STUDIES
TYCO LABS INC WALTHAM MA
Studies of the passivation of Zn-Fe, Zn-Mn, Zn-Co, and Zn-Ni alloys were made potentiostatically. Alloys of 90 Zn 10 Fe corrode at a high rate even when passive. Alloys of 83Zn-17 Mn have low, active dissolution currents. The 89 Zn - 11 Co alloys have high dissolution currents in the passive state, while the 78 Zn - 22 Co and 80 Zn -20 Ni alloys appear promising as anodes which may be kept in a passive, reserve state. These two alloys have acceptably high critical currents and low passive currents. Their activation characteristics were studied in detail in 6 N KOH activation to about 75 of the original current density can be achieved in 20 to 90 sec, depending on the alloy and its history. Studies of Cr, Al, and of amalgams of Mg show them to be unsuitable for use as reserve anodes. Initial studies of the passivation of Zn-C0 and Zn-Ni in electrolytes containing sulfate and chloride ions showed that their dissolution behavior is similar to that in KOH alone.
Quarterly rept. no. 3, 1 Jun-31 Aug 1966
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