KCStudly wrote:mgb4tim wrote:isn't mixing aluminum and stainless a bad idea (galvanic corrosion)?
No, unless it is submerged in salt water, then schmaybe.
Read on:
Q. I have an application were I have a 1/4" thick plate of aluminum in direct contact with a sheet of 304 Stainless Steel. Also I want to use an all aluminum pop rivet (both body and mandrel made out of aluminum)which will fasten the 1/4" thick plate with stainless steel. This application will see sea coast environment (but not an underwater application). Is there a chance of galvanic corrosion especially the pop rivets weakening out? I am looking for a quick solution. I looked for similar stainless steel pop rivets, but they are not available in the time frame I need to work with.
Saibal S deleted
Operations Manager - Douglasville, Georgia
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A. Dead certain for corrosion. You may be able to prevent it by putting an insulator between the two. Try neoprene or something similar. It must not adsorb any moisture however.
Trevor Crichton
R&D practical scientist
The Pheasantries - Chesham, U.K.
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A. Epoxy paint the faying surfaces and pull the rivets wet (soaked, including inside) with chromate primer(gives up to corrosion before metal will). Not ideal but good enough for government work.
James H
- Jacksonville, Florida
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A. Aluminum in a seacoast environment is not a long term proposition. However, you may want to consider using stainless steel fasteners. The rate of galvanic corrosion is related directly to the ratio of cathode area (stainless) to anode area (aluminum). In other words a relatively small anode area like an aluminum pop rivet will be attacked much faster than a large one like the 1/4" plate. Good luck.
Fred D
high performance architectural metals - Cranberry Twp., Pennsylvania
And there you go......
