will grounding prevent aluminum corrosion?
will grounding prevent aluminum corrosion?
(OP)
Hi all
1 - I have an aluminum frame;
2 - This aluminum frame is supported by a galvanized steel structure;
3 - Both the aluminum frame and steel structure are grounded, by means of separate conductors, connected to the same ground collector.
Will this prevent galvanic corrosion? (the metals should have the same potencial!)
Thanks
MAC
1 - I have an aluminum frame;
2 - This aluminum frame is supported by a galvanized steel structure;
3 - Both the aluminum frame and steel structure are grounded, by means of separate conductors, connected to the same ground collector.
Will this prevent galvanic corrosion? (the metals should have the same potencial!)
Thanks
MAC





RE: will grounding prevent aluminum corrosion?
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RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
so that applying chem film, anodize or paint helps with corrosion by replacing the oxide surface.
alos heat treating depending on the type aluminum.
any time dissimilar metals are assembled together there can be issues.
to get an actual sientific answer it can be easily googled.
HTH
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
After machining, the protective oxide film is rapidly regenerated. It is true, that anodizing and other surface treatments can improve corrosion resistance.
macPT,
Grounding as stated will not prevent galvanic corrosion. But as TomDOT states, the galvanic potential mismatch is minimal until the zinc coating is removed from the steel.
RE: will grounding prevent aluminum corrosion?
Thanks for the input. The Alu frame is anodized, but the environment is wet.
I am not expecting corrosion to be a big issue, but I was expecting that grounding would improve corrosion resistance...
RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
RE: will grounding prevent aluminum corrosion?
In just H2O, the Al2O3 coating is pretty stable. Halogens in solution will destabilize the oxide film and initiate corrosion. Grounding the Al plate, would place the plate at the potential of the surroundings and that would only facilitate charge flow and not hinder it. Get a car battery and connect the negative terminal to the Al Plate and 'ground' the positive terminal. That would put the plate at a higher (more negative) electrical potential than ground. That may be be enough to protect the plate. You could also use a sacrificial anode.
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566