The Incorporation of Sulphate into Anodic Coatings using Radioactive Sulphur as Tracer
- 1 January 1963
- journal article
- research article
- Published by Taylor & Francis in Transactions of the IMF
- Vol. 40 (1) , 31-34
- https://doi.org/10.1080/00202967.1963.11869849
Abstract
The incorporation of sulphate into anodic coatings formed in H2SO4 and CrO2-H2SO4 electrolytes has been studied using S35 as tracer in the sulphuric acid. This has shown that sulphate is included in the anodic coating as part of the anodic process. During the formation of the barrier layer the sulphate content fluctuates but once the barrier layer is established these fluctuations cease. During the growth of the main porous superstructure, the percentage of sulphate in the film decreases slightly but progressively with increasing anodizing time. Sulphate ions are more readily incorporated into anodic coatings than are oxalate ions. The reasons for these phenomena are discussed in relation to the current views on the mechanism of anodic coating formation.Keywords
This publication has 4 references indexed in Scilit:
- The Anodic Treatment of Aluminum in Sulfuric Acid SolutionsJournal of the Electrochemical Society, 1955
- Factors Affecting the Formation of Anodic Oxide CoatingsJournal of the Electrochemical Society, 1954
- Structure of Amorphous Aluminium Oxide FilmsNature, 1951
- Mechanism of Electrolytic Oxidation of AluminumJournal of Applied Physics, 1944