The Precious Metals Comprising Gold Silver And Platinum
The Precious Metals Comprising Gold Silver And Platinum
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and iron in these alloys are not easily separated by cupella- tion, but they are readily soluble in aqua regia. If the per- centage of iron is not too small it is readily removed by THE ALLOYS OF GOLD 57 dissolution in hot dilute sulphuric acid, or less conveniently by hydrochloric acid or nitric acid. The alloys of gold and iron are formed with expansion.
J484- GOLD AND NICKEL.
Small quantities of nickel alloyed with gold produce pale yellow, hard, veryductile alloys, which are magnetic and ta...ke a good polish. Hatchett l found that 8 per cent, of nickel made gold brittle with a coarse-grained earthy fracture. The two metals form a eutectic, 2 which contains about 22 per cent, of nickel and melts at 950. The freezing-point curve of the alloys is shown in Fig. 11, which is after Levin.
too Percentage weight of Nickel.
FIG. 11. Freezing Points of Alloys of Gold and Nickel.
GOLD AND COBALT.
Cobalt has a far greater effect than nickel in making gold brittle. According to Hatchett, standard gold becomes brittle if only one-eightieth part of cobalt is melted with it.
What to read after The Precious Metals Comprising Gold Silver And Platinum?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Kirke Rose to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
and iron in these alloys are not easily separated by cupella- tion, but they are readily soluble in aqua regia. If the per- centage of iron is not too small it is readily removed by THE ALLOYS OF GOLD 57 dissolution in hot dilute sulphuric acid, or less conveniently by hydrochloric acid or nitric acid. The alloys of gold and iron are formed with expansion.
J484- GOLD AND NICKEL.
Small quantities of nickel alloyed with gold produce pale yellow, hard, veryductile alloys, which are magnetic and ta...ke a good polish. Hatchett l found that 8 per cent, of nickel made gold brittle with a coarse-grained earthy fracture. The two metals form a eutectic, 2 which contains about 22 per cent, of nickel and melts at 950. The freezing-point curve of the alloys is shown in Fig. 11, which is after Levin.
too Percentage weight of Nickel.
FIG. 11. Freezing Points of Alloys of Gold and Nickel.
GOLD AND COBALT.
Cobalt has a far greater effect than nickel in making gold brittle. According to Hatchett, standard gold becomes brittle if only one-eightieth part of cobalt is melted with it.
What to read after The Precious Metals Comprising Gold Silver And Platinum?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Kirke Rose to read onlineMoreLess
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