Ice drift in polar regions

• Book ID: 104117828
• Publisher: Elsevier Science
• Year: 1912
• Tongue: English
• Weight: 65 KB
• Volume: 173
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(12)90174-x

✦ Synopsis

Zinc Alloys Heated in Vacuo. T. TURNER," (Inst. o/ Metals, Jan., I912.)--It is found that zinc and other metals, are entirely removed from brass and other copper-zinc alloys when they are heated" in a vacuum. In the case of brass the separation of the zinc is quantitative, provided the temperature does not exceed I2oo ° C. and the heating is not too prolonged: by subjecting a sample of " poisoned" brass to this treatment all the zinc. lead, and arsenic and a little of the tin were removed at I2oo ° C. Zinc volatilizes easily at 375 ° C. in a vacuum, and is readily volatilized from 6o/40 and 70/3 ° brass at temperatures of 520 ° C. and 540 ° C. respectively. When I8o grammes of 7o/3 ° brass were melted in a crucible and allowed to cool in an exhausted desiccator, the percentage of zinc in the alloy was sensibly reduced, although the charge could not have remained liquid for more than 3 minutes.