ANODIC DISINTEGRATION OF ZINC UNDERGOING ELECTROLYSIS IN NITRATE SOLUTIONS
Abstract
A dark corrosion product forms on zinc during electrolysis in nitrate solutions but does not form when the electrode is amalgamated or when it is dissolved in chloride or sulfate solutions. Optical and x-ray studies revealed that the dark film is composed of many small metallic zinc particles embedded in a matrix of Zn(OH)2. During electrolysis this film spolls off the electrode and reacts with the electrolyte, subsequently turning white. It is concluded that the normal valency of zinc ion does not change during anodic dissolution in nitrate solutions, but rather that the apparent valency of less than two arises as a consequence of partial disintegration of the anode. The small metallic particles may then directly or indirectly reduce the oxidizing electrolyte. The dissolution of zinc outside the electrical circuit thus accounts for the lower coulombic equivalent.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1963
- Accession Number
- AD0430547
Entities
People
- G. E. Stoner
- M. E. Straumanis
- W. J. James