Copper and copper alloys. Determination of impurities in pure copper. ETA-AAS method

2006 ◽  
Keyword(s):  
Copper Alloys ◽  
Pure Copper ◽  
Aas Method ◽  
Determination Of Impurities

Was Native Copper used in Transcaucasia in Eneolithic Times?

1964 ◽  
Vol 30 ◽  
pp. 66-74 ◽  
Author(s):  
I. R. Selimkhanov
Keyword(s):  
Copper Alloys ◽  
Pure Copper ◽  
Native Copper ◽  
Cold Worked

The majority of scientists hold the opinion that mankind first knew metal in the form of native copper. In particular, at this period the malleability of native copper was realized, and its brittleness when cold worked, as well as the need of annealing to cold forge the necessary tools. The melting of copper was discovered later when native copper was met with in association with ores.These opinions are shared by H. H. Coghlan and H. Otto and W. Witter, though the first mentioned also pointed out that in some regions artifacts made from copper alloys existed in early periods while artifacts made of pure copper might be met with in the latest periods.V. I. Vernadski also had some doubt about the unconditional validity of this theory. However, he did not deny that where native copper was distributed it was the first metal replacing (although only partly) stone and bone for making tools. In certain cases such an assertion has been supported by old and unreliable analyses of ancient artifacts, as well as by some mistakes in the determination of their age.

TEM study of a biofilm on copper corrosion

1996 ◽  
Vol 54 ◽  
pp. 220-221
Author(s):  
W. A. Chiou ◽  
N. Kohyama ◽  
B. Little ◽  
P. Wagner ◽  
M. Meshii
Keyword(s):  
Marine Bacterium ◽  
Culture Medium ◽  
Copper Alloys ◽  
Pure Copper ◽  
Localized Corrosion ◽  
Natural Seawater ◽  
Copper Corrosion ◽  
New Approach ◽  
The Past ◽  
Copper Tolerant

The corrosion of copper and copper alloys in a marine environment is of great concern because of their widespread use in heat exchangers and steam condensers in which natural seawater is the coolant. It has become increasingly evident that microorganisms play an important role in the corrosion of a number of metals and alloys under a variety of environments. For the past 15 years the use of SEM has proven to be useful in studying biofilms and spatial relationships between bacteria and localized corrosion of metals. Little information, however, has been obtained using TEM capitalizing on its higher spacial resolution and the transmission observation of interfaces. The research presented herein is the first step of this new approach in studying the corrosion with biological influence in pure copper.Commercially produced copper (Cu, 99%) foils of approximately 120 μm thick exposed to a copper-tolerant marine bacterium, Oceanospirillum, and an abiotic culture medium were subsampled (1 cm × 1 cm) for this study along with unexposed control samples.

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