Re: Larry's 1951 Club Sedan Project
Posted by Thomas Wilcox On 2011/4/12 8:54:40
Larry,
If you are putting aluminum in contact with copper you will need to be careful of galvanic corrosion. The standard electrode potential between copper and aluminum is -2.18ev. This is a large potential, and even a weak electrolyte will result in oxidation of the copper and eventual failure of the joint. If there is any potential for AC current leakage (common with cheaper battery chargers) this reaction will be greatly sped up.
This galvanic corrosion potential is the reason behind never directly joining aluminum and copper wiring.
Even putting steel and aluminum together is not a great idea if you are in a humid environment.
Therefore, I would recommend insulating the junction between the copper pipe and the aluminum tray. Or, alternatively you could install a sacrificial zinc.
Or I could just be paranoid from working on boats
.
Tom
If you are putting aluminum in contact with copper you will need to be careful of galvanic corrosion. The standard electrode potential between copper and aluminum is -2.18ev. This is a large potential, and even a weak electrolyte will result in oxidation of the copper and eventual failure of the joint. If there is any potential for AC current leakage (common with cheaper battery chargers) this reaction will be greatly sped up.
This galvanic corrosion potential is the reason behind never directly joining aluminum and copper wiring.
Even putting steel and aluminum together is not a great idea if you are in a humid environment.
Therefore, I would recommend insulating the junction between the copper pipe and the aluminum tray. Or, alternatively you could install a sacrificial zinc.
Or I could just be paranoid from working on boats
.Tom
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