Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 273
Copper, Silver, And Cadmium Alloys.
Оглавление—Cadmium added to silver alloys gives great flexibility and ductility, without affecting the white color; these properties are valuable in the manufacture of silver-plated ware and wire. The proportions of the metals vary in these alloys. Some of the most important varieties are given below.
| Silver | Copper | Cadmium | |
|---|---|---|---|
| I. | 980 | 15 | 5 |
| II. | 950 | 15 | 35 |
| III. | 900 | 18 | 82 |
| IV. | 860 | 20 | 180 |
| V. | 666 | 25 | 309 |
| VI. | 667 | 50 | 284 |
| VII. | 500 | 50 | 450 |
In preparing these alloys, the great volatility of cadmium must be taken into account. It is customary to prepare first the alloy of silver and copper, and add the cadmium, which, as in the case of the alloys of silver and zinc, must be wrapped in paper. After putting it in, the mass is quickly stirred, and the alloy poured immediately into the molds. This is the surest way to prevent the volatilization of the cadmium.
