I need to refasten an aluminum splash shield to the bottom of my
aluminum shower door. Previous screws were steel, I guess, and rusted
out. What shall I use to minimize galvanic action? I haven't seen
aluminum sheet-metal screws around.
Use good quality aluminum pop rivets. They will not react galvanically with
the aluminum doors.
DO NOT USE stainless rivets or screws as they will galvanically react with
the aluminum doors and corrode the aluminum out.
I thought non-magnetic vs magnetic SS's had been discussed in AHR.
Most 300 series stainless steels are typically non-magnetic (as are
400 series is magnetic
However 300 series stainless steel can exhibit magnetic behavior
(quite strongly) if subjected to heavy cold working, buffing or
Variations is alloying elements can cause this as well.
I learned this via an embarrassing experience about 25 years ago.
A stamped metal part made of 305 stainless and black oxide finished
that I had made was magnetic.
I called the supplier to complain that "obviously" the part had been
made of carbon steel by mistake.
He explain to be that the part was indeed 305 & the heavy cold working
had induced the magnetic behavior.
Aluminum screws can be had from www.mcmaster.com
But steel or stainless steel can work too.
I have a 30 year old shower door enclosure (gold anodize) that was
installed & assembled using electro-galvanized steel screws.
The screws lasted very well but did show some rust.
I replaced them with SS screws.
Yes, SS & aluminum are VERY incompatible, considering their relative
locations on the galvanic series.
BUT there are other factors involved in the phenomena of galvanic
water chemistry, duty cycle, actual conditions and most importantly,
the "area rule".
SS screws infrequently placed in a relatively large area of aluminum
will not trigger catastropifc galvanic.
However, the reverse........ aluminum screws in a large area of
SS ,coupled with water rich in salts
and you've got a situation where aluminum screws will disappear in now
I would use the SS screws & not worry.
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