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copper slip and aluminuim frames with parts
I have a aluminuim frame i am building up. I was about to screw in the deore
rear derailleur and it struck me i wasnt sure if i should use copper slip, since i think i read that steel, copper slip and aluminuim can react with electolysis taking place. so should i use copper slip or grease? many thanks panda -- uk to net for response |
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copper slip and aluminuim frames with parts
sam- I have a aluminuim frame i am building up. I was about to screw in the
deore rear derailleur and it struck me i wasnt sure if i should use copper slip, since i think i read that steel, copper slip and aluminuim can react with electolysis taking place. so should i use copper slip or grease? BRBR Either, just not dry... Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
#3
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copper slip and aluminuim frames with parts
"ajames54" wrote in message ... On Sun, 30 Nov 2003 10:50:11 -0000, "panda" made this cogent remark : I have a aluminuim frame i am building up. I was about to screw in the deore rear derailleur and it struck me i wasnt sure if i should use copper slip, since i think i read that steel, copper slip and aluminuim can react with electolysis taking place. so should i use copper slip or grease? many thanks panda Copper slip/copper grease or anti-seize are pretty much the same thing and are a good idea when putting two dissimilar metals together...the electrolysis (galvanic corrosion) will take place in any event the copper acts as a sacrificial material to protect the other two... that being said a barrier method like Teflon tape is often a better answer in situations like the derailleur bolt that wont (ever?) be moved after installation. Finally since the part is unlikely to be moved often and has a reasonably small surface area ...regular Grease will also be fine... How's that for a non answer? cheers. although i had made it completely UNclear i actually meant copper slip or normal grease. but question answered anyway - thanks panda |
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copper slip and aluminuim frames with parts
"ajames54" wrote:
Copper slip/copper grease or anti-seize are pretty much the same thing and are a good idea when putting two dissimilar metals together...the electrolysis (galvanic corrosion) will take place in any event the copper acts as a sacrificial material to protect the other two... that being said a barrier method like Teflon tape is often a better answer in situations like the derailleur bolt that wont (ever?) be moved after installation. Copper is absolutely no sacrifice material since it is more inert than any other metals on a bike. Copper grease will however prevent seizure of the metal parts ("cold welding"). This has nothing to with corrosion. Copper grease consist mostly of grease and it is the grease that limits corrosion by hindering water to wet the surfaces. Best regards Erik Lindeberg |
#5
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copper slip and aluminuim frames with parts
This has nothing to with corrosion. Copper grease consist mostly of grease and it is the grease that limits corrosion by hindering water to wet the surfaces. Water doesn't have anything to do with it. Look up galvanic corrosion. Phil Brown |
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copper slip and aluminuim frames with parts
unged (Phil Brown) wrote in message ...
This has nothing to with corrosion. Copper grease consist mostly of grease and it is the grease that limits corrosion by hindering water to wet the surfaces. Water doesn't have anything to do with it. Look up galvanic corrosion. Phil Brown Dear Phil, The first thing that came up suggests that you need to explain further: http://www.ocean.udel.edu/mas/masnotes/corrosion.html Galvanic Corrosion by Dr. Stephen C. Dexter Professor of Applied Science and Marine Biology Galvanic corrosion, often misnamed "electrolysis," is one common form of corrosion in marine environments. It occurs when two (or more) dissimilar metals are brought into electrical contact under water. When a galvanic couple forms, one of the metals in the couple becomes the anode and corrodes faster than it would all by itself, while the other becomes the cathode and corrodes slower than it would alone. Either (or both) metal in the couple may or may not corrode by itself (themselves) in seawater. When contact with a dissimilar metal is made, however, the self-corrosion rates will change: corrosion of the anode will accelerate; corrosion of the cathode will decelerate or even stop. We can use the seawater Galvanic Series, shown in Table 1, to predict which metal will become the anode and how rapidly it will corrode. [it goes on for quite a while and the table seems to indicate that water is rather important] Carl Fogel |
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