The Brass World and Platers´ Guide, Vol. 8
| Preis: | 20.95 EUR* (inkl. MWST zzgl. Versand - Preis kann jetzt höher sein!) |
| Versand: | 0.00 EUR Versandkostenfrei innerhalb von Deutschland |
| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Sperry, Erwin S.) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The Brass World and Platers´ Guide, Vol. 8: A Journal Devoted to the Art of Refining, Alloying, Casting, Rolling, Founding, and Electroplating of All the Non-Ferrous Metals, 1912 When zinc is absent, however, a large amount of phosphorus can be used it desired. In the early days of phosphor-bronze, makers of phosphorus alloys, such as phosphor-tin or phosphor-copper, gave formulas for two kinds of metals: One without zinc, and cheaper mixtures containing zinc. It was soon found, however, that these cheaper mixtures were unsatisfactory as too much phosphorus was recommended. It good grades of phosphor-bronze are desired, keep zinc out of the mixtures as it will cause pinholes and general unsoundness. The bronze without it will be stronger, tougher and better in every way. It is suggested that the use of the name "phosphor-bronze" be restricted to copper and tin. or copper tin and lead alloys containing phosphorus and free from zinc. Heretofore, it has been difficult to define phosphor-bronze, and this designation would appear to come as near to the solution as any, and at the same time the mixtures are good ones and the designation logical. Difficulty in Detinning Old Tin Cans. The present high price of tin has stimulated the desire of scrap metal dealers to and some process of reclaiming the tin on old tin cans, millions of which are thrown away yearly. They can be obtained almost for the cost of picking up and it would, therefore, appear that such a process might be very profitable. The difficulty in the way of reclaiming the tin from old tin cans is in the amount of refuse they contain. They are rarely free from food, and when picked from a dump are filled with ashes and other refuse. In addition to this, they are covered with a paper label and frequently varnished besides. There are several well known processes for reclaiming tin from scrap tin plate, cither in I´m of clippings or tin cans, and they all consist of dissolving off the tin by some acid or similar solvent and leaving the iron. A very simple method is to dissolve off the tin with muriatic acid, and then precipitate it with galvanized iron clippings. A method followed in the large detinning plants is to remove the tin by means of stannic chloride which attack the iron appreciably; but this requires expensive apparatus. The muriatic acid method can be used without expensive installation. If tin cans are used, however, before the tin can be dissolved off by any substance, the food, labels and other foreign matter must he removed and this is the obstacle in the way. There is so much foreign matter to be removed and it is present in such an excess, that the detinning of old tin cans is not considered profitable on this account. There are several plants in the United States which carry on detinning, but they all work on sheet tin clippings which are clean and require no preliminary treatment. Coating Plating Racks with Celluloid. in plating articles on racks, it is always desired to keep the metal from the racks as much as possible. This is particularly true of special shaped racks that are comparatively costly, and also in the case of precious metals like gold or silver. When the metal accumulates to such an extent upon the racks as to render them no longer lit for use, they must either be sold to junk dealers, or stripped. In the case of gold and silver racks, it is customary to strip them, of course, but other metals do not pay and the racks are sold. In either case, there is an expense attached which would be obviated it the metal could he prevented from depositing upon the portions of the rack where not wanted. In a number of plating establishments, the use of celluloid is now being tried
* Preis kann jetzt höher sein. Den aktuellen Stand und Informationen zu den Versandkosten finden sie auf der Homepage unseres Partners.
Folgende Produkte könnten dir ebenso gefallen
