It is desired to learn if these two metals form an alloy and if so, what is the reference to its phase diagram. This information is relevant to the catalysis anticipated from the mixed metal.
There are many cobalt-copper alloys made for different applications.For the phase daigram please see the following reference.
The Co− Cu (Cobalt-Copper) system
T Nishizawa, K Ishida
Journal of Phase Equilibria 5 (2), 161-165, 1984
Dear Dr. Kooti: Thanks for your answer. This information is just what I needed. Best regards, Mark G. White, Ph. D.
Dear Mohammad: No, the alloy is not the goal. We used dinuclear metal complexes of Cu-Co to obtain a mixed Cu Co aggregate solid, initially. Mark.
Cobalt is usually added to copper to improve corrosion resistance. Normally the percentages of cobalt are less than 10%. For example, the C63800 alloy (95Cu-2.8Al-1.8Si-0.4Co). Other examples are found in the alloy C66400 (86.5Cu-11.5Zn-1.5Fe-0.5Co) and the alloy C68800 (73.5Cu-22.7Zn-3.4Al-0.4Co).
I was doing some research online about copper and cobalt alloys for the creation of novel copper alloys, and found a website by the name of Belmont Metals, they have a premade master alloy consisting of 10% cobalt and 90% copper. Based on them selling it, I would say that safely that proves the two can be alloyed together in concentration higher than a 1% or so. However I have no idea about the properties of this alloy with such a high cobalt concentration. As Hermas said above, from what I've read, cobalt is excellent at increasing the corrosion resistance of pure copper. Perhaps I'll buy some of the master alloy and try adding 2% to bronze to see if there are any noticeable differences besides the added corrosion resistance.
I hope this was of some help! I'll definitely post my findings if I decide to try making any new cobalt bronzes!
Hope you have a good rest of your day,
Mike P.
Hey again, I just successfully created three new novel copper alloys with varying degrees of cobalt ranging from 2-5% by weight. All of the alloys were ternary mixtures consisting of three different elements with the majority consisting of copper. The cobalt seems to have increased their corrosion resistance, liquid viscosity, melting temperature, as well as adding some very interesting oxidation scale on the outside of the ingots. The increased melting temperature was mitigated by the addition of a third element with a eutectic relationship to cobalt, into the alloy. I look forward to doing more tests on these three new alloys, I call them, Cobalt Bronze, Cobalt Brass and Silicobalt bronze, to pay homage to their third element added. I'd love to get these alloys analyzed by a lab sometime soon, hope this was helpful!
Thanks,
Mike P.
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