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Stainless Bolts w/Galv Steel

Stainless Bolts w/Galv Steel

Stainless Bolts w/Galv Steel

(OP)
I have an SSINA Designer Handbook that suggests "the corrosion of the base metal may be markedly increased by the fastener material" when using stainless steel bolts with galvanized steel.  Anybody have any experience with this?

RE: Stainless Bolts w/Galv Steel

Yes.  Passive stainless will promote the rapid consumption of the zinc, followed by the iron underneath it.  It is best to use zinc coated fasteners (hot dipped galvanizing, zinc electroplating, or multilayer zinc flake coating) to join galvanized structures.

Regards,

Cory

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RE: Stainless Bolts w/Galv Steel

It's kinda neat, though, to see the pretty zinc crystals all over your stainless hardware (this is from fully immersed hardware).

RE: Stainless Bolts w/Galv Steel

(OP)
Thank you both for your replies...

My boss doesn't seem to think this is much of a problem. I have already cited the SSINA Designer Handbook; Would you know of any other references I can use to support my position? These are for immersed applications in sewage treatment tanks.

JW

RE: Stainless Bolts w/Galv Steel

JKW05  I am presently replacing several  circular shells,   3 feet dia  made from heavily Galvanised steel ,   each is in two halves and joined together with 3/8 stainless bolts - they have been  totally immersed in Sewage liquor and are now  in such condition as to need replacement (  now  being made  in GRP )   The corrosion was  hastened because  these shells  were touching  the stainless supply pipe ,also submerged .Cheers  CM
(do you want a picture of the shell for your boss? )

RE: Stainless Bolts w/Galv Steel

corrosionman, how long were these is service?

Steve

RE: Stainless Bolts w/Galv Steel

(OP)
Corrosionman,

If there is a way of obtaining a picture, that may be useful; Thanks!

Also, I would also be interested in how long these were in service.

JKW

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