The corrosion and electrical properties of steels
| Autor: | Robert Abbott Hadfield, Edgar Newbery |
|---|---|
| Rok vydání: | 1917 |
| Předmět: | |
| Zdroj: | Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character. 93:56-67 |
| ISSN: | 2053-9150 0950-1207 |
| DOI: | 10.1098/rspa.1917.0003 |
| Popis: | As long ago as 1899, Caspari showed that the condition that zinc should dissolve in an acid solution with evolution of hydrogen may be expressed in the form— Single potential of metal + overvoltage < single potential of hydrogen electrode. ( a ) The single potential of zinc in a normal zinc sulphate solution is —0⋅493 volt, and that of a hydrogen electrode in normal sulphuric acid is +0⋅277 volt. If a mixture of zinc sulphate and sulphuric acid be taken, the potential of the zinc will become more positive as the concentration of zinc sulphate increases, and the potential of the hydrogen electrode more negative as the concentration of the acid decreases. Since the overvoltage of pure zinc is about 0⋅7 volt, conditions may be easily adjusted in this way so that solution is exactly arrested and the statement above ( a ) then becomes an equation. If a definite solution is used for a series of experiments, then the potential of the hydrogen electrode is constant, and the tendency of the metal to dissolve will be measured by the fixed potential of this hydrogen electrode minus the sum of the overvoltage and the potential of the metal. |
| Databáze: | OpenAIRE |
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