ANODIC DISSOLUTION OF ZINC IN POTASSIUM NITRATE
Abstract
The apparent valence of pure zinc dissolving anodically in 3% KNO3 was determined as a function of current density, temperature, and ultrasonic agitation. The apparent valence of zinc dissolving anodically at 24C at current densities < 30 ma/sq cm is 2.01 = 0.01. From 30-40 ma the valence diminished and from 42 ma up to about 80 ma/sq cm it remained constant at about 1.87. Ultrasonic vibrations had almost no effect on the apparent valence at high current densities is approximately the same as with no ultrasonic vibrations. In both cases a black film (corrosion product) spalls off the anode but to a larger extent with ultrasonics. At elevated temperatures the apparent valence again decreases with increasing current density and appears to vary as a function of metal history. It was concluded that the normal valency of zinc ions, =2, does not change during anodic dissolution in nitrate solutions, but the apparent valence of less than 2 arises as a consequence of partial disintegration of the anode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1964
- Accession Number
- AD0608955
Entities
People
- J. L. Reed
- M. E. Straumanis
- W. J. James