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ELECTROCHEMICAL PROPERTIES OF PbO$sub 2$ AND THE ANODIC CORROSION OF LEAD AND LEAD ALLOYS

Journal Article · · Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol.
DOI:https://doi.org/10.1149/1.2428866· OSTI ID:4313479
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The total amount of anodic oorrosion of Pb and PbSb alloys in suifuric acid under conditions of O/sub 2/ evolution can be evaluated by measuring the length of the potential plateau (transition time) during the electrochemical reduction of the PbO/sub 2/ layers, with a constant current, taking into account self-discharge and degree of utilization of the PbO/sub 2/. Using high resolution techniques, a characteristic step in the potential plateau during discharge of the PbO/sub 2/ layer was discovered. This step ean be attributed to a difference in discharge overvoltage between alpha and BETA -PbO/sub 2/. For alloys of the Pb-Sb system, constant current corrosion increases slightly with increasing Sb concentration, whereas oxygen overvoltage decreases and constant potential corrosion strongly increases with increasing Sb concentration. Precise electrode potential measurements of the alpha -PbO/sub 2/PbSO/sub 4/ and the BETA -PbO/sub 2/ PhSO/sub 4/ couple dave 1.7085 plus or minus 0.0005 v and 1.7015 plus or minus 0.0005 v, respectively, vs. H/sub 2/ in 4.40M sulfuric acid at 31.8 d C. These two oxides have different oxygen overvoltage characteristics. Removal of oxygen from BETA -PbO/sub 2/ results in a new crystalline compound PbO/sub x/ with x 1.4 to 1.6, with a pseudo-face- centered cubic orthorhombic lattice. This new compound is a nonconductor. The influence of the oxygen content of the lead oxides on their electrochemical behavior is discussed. (auth)
Research Organization:
Electric Storage Battery Co., Philadelphia
Sponsoring Organization:
USDOE
NSA Number:
NSA-12-013123
OSTI ID:
4313479
Journal Information:
Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol., Journal Name: Journal of the Electrochemical Society (U.S.) Absorbed Electrochem. Technol. Vol. Vol: 105; ISSN JESOA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANODES
ANTIMONY
ANTIMONY ALLOYS
CORROSION
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODES
FILMS
LATTICES
LEAD
LEAD ALLOYS
LEAD OXIDES
LEAD SULFATES
MEASURED VALUES
MINERALOGY, METALLURGY, AND CERAMICS
OXYGEN
QUANTITY RATIO
REACTION KINETICS
REDUCTION
SULFURIC ACID