. Rame e leghe di base : le proprietà fisiche e meccaniche del rame e sue leghe commerciali in forma battuto. Rame e leghe di rame. Rame e leghe a base di rame che sono privi di ossigeno o sono state disossidato con fosforo o altri deoxidants non sono materialmente influenzata da esposizione ad atmosfera riducente a temperature elevate. La presenza di piccole quantità di fosforo, argento, arsenico o antimonio ha l'effetto di innalzare il mini- mamma la temperatura a cui il rame si ammorbidiscono. In molte applicazioni il maggiore punto di ricottura è auspicabile e argento in quantità fino
1581 x 1581 px | 26,8 x 26,8 cm | 10,5 x 10,5 inches | 150dpi
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. Copper and copper base alloys : the physical and mechanical properties of copper and its commercial alloys in wrought form. Copper; Copper alloys. Copper and Copper-base Alloys of copper which are oxygen-free or have been deoxidized by phosphorus or other deoxidants are not materially affected by exposure to reducing atmospheres at elevated temperatures. The presence of small amounts of phosphorus, silver, arsenic, or antimony has the affect of raising the mini- mum temperature at which copper will soften. In many applications this higher annealing point is desirable and silver in amounts up to 25 ounces per ton is fre- quently specified.. Fig. 1 —fetiuctuie of cold worked and annealed copper (tough pitch). Etchant NH4OH + H202. Magnification 75 X. Corrosion Resistance.—Although the commonly avail- able commercial coppers differ in their content of certain minor constituents, none of these significantly alter the characteristics of the metal in respect to its ability to resist corrosion. Copper withstands atmospheric corrosion and sea- water corrosion as satisfactorily as any other com- mercially available metal, and it has been used for centuries in construction where resistance to attack of this nature is desired. In addition, copper is sub- stantially immune to the chemical attack of a large number and variety of industrial chemicals, although copper ordinarily should not be used in contact with oxidizing acids and most oxidizing agents, or in services where alternate exposure to oxidizing conditions and acid reagents is anticipated. Metallic salts readily susceptible of chemical reduction are particularly dangerous in respect to the corrosion of copper; and ferric, stannic, mercuric, and cupric com- pounds, particularly, constitute a source of danger when present in an otherwise non-oxidizing acid solution, which of and by itself might be inactive with respect to copper. Ammonia and carbon dioxide in the presence of moisture and in relatively low concentra
