Aluminum to Stainless
Aluminum to Stainless
(OP)
Is there any problem with galvanic action when I connect aluminum directly to stainless steel?
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RE: Aluminum to Stainless
The material on top will corrode preferentially, so the aluminum will become more susceptible.
RE: Aluminum to Stainless
RE: Aluminum to Stainless
Should another type of material be used or isolate them from each other? The parts would be connected together with stainless screws.
RE: Aluminum to Stainless
You should try to design a joint that will electrically isolate the two metals from each other. There are such connections commercially available mostly made from plastics (special washers and such). Otherwise you run the risk of rapid corrosion of the Al.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Aluminum to Stainless
RE: Aluminum to Stainless
EdStainless: I would doubt that those connections would be exposed to road salt since this is 35 feet above grade. The handrails are decorative only and there are no adjacent deck where people could potentially salt.
Do you have a website or a company name for commercially available connections?
RE: Aluminum to Stainless
I recall seeing such washers on a web site for a company that builds stainless hand rails. I can't find it right now. They are similar to the hardware that you use when connecting system that have cathotic protection and you need to isolate some parts.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Aluminum to Stainless
RE: Aluminum to Stainless
"Corrosion Resisting Steel" = Stainless Steel for the rest of us
RE: Aluminum to Stainless
RE: Aluminum to Stainless
I'll try to get a name for you.
RE: Aluminum to Stainless
Graphite based material may cause pitting of the AL.
RE: Aluminum to Stainless
You should try to isolate them if easily done so. However, it seems that individuals here forgot the first rule of corrosion engineering. You have to consider the materials in the environment they will be used in.
Since SS and AL will pasivate in the given environment you will likely see a reaction that is completely different than that listed on the tables. You will end up with a dull finish on both materials with little corrosion of either. It is doubtfull that you will have enough of a cell to "burn through" the passivating mechanisms of either metal.
RE: Aluminum to Stainless