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Corrosion Resistant Fasteners
2

Corrosion Resistant Fasteners

Corrosion Resistant Fasteners

(OP)
Not sure if such a steel exists but here goes.  We have a trench drain in a concrete slab.  Draining into the trench is 50% Sodium Hydroxide(Caustic) and 93% Sulphuric Acid.  Rather than form a ledge into the concrete to carry the trench grating, we're considering installing angle iron with bolts into the existing trench wall.

Good idea or Bad?  

RE: Corrosion Resistant Fasteners

Bad.

Rod

RE: Corrosion Resistant Fasteners

ansys54,

Interesting.  *IF* the pH ends up anywhere near neutral you may be OK-assuming they are mixed well before they reach the steel.  The steel will survive the caustic OK, but not the acid.  If you need a metal to resist the acid, holler back.

RE: Corrosion Resistant Fasteners

(OP)
Sodium Hydroxide PH is 14 and 93% Sulphuric is 0.3.  I suspect a "Bad" and a "holler back" are consistent with what I thought but wasn't sure until now.
Thanks to both of you.

My specialty is concrete so if I can ever be of help just ask.

RE: Corrosion Resistant Fasteners

Sorry,

I didn't get it all?

Is the NaOH and H2SO4 going down a tRench made of concrete or it is lined?  

tom

RE: Corrosion Resistant Fasteners

(OP)
Trench is made of concrete.

RE: Corrosion Resistant Fasteners

Are they mixed *before* they enter the trench?  That acid by itself will destroy concrete.

RE: Corrosion Resistant Fasteners

(OP)
Yes they mix then spill onto a coated floor and run into the trench.

RE: Corrosion Resistant Fasteners

Good!  Do you know the approx. pH of the mixture?

RE: Corrosion Resistant Fasteners

I'm curious,
Does your concrete have a coating or sealant for protection?
[If not, I suggest a clear, penetrating epoxy sealer or a coating of Derakane vinylester epoxy]

Do you have an EPA or other government permit for this hazardous waste treatment process?

RE: Corrosion Resistant Fasteners

(OP)
I don't Metalguy however that's a good and obvious question which I hadn't thought of until now.  I will test it.

Kenvlach, this is not effluent and is NOT discharged directly into the environment.  It gets recycled back into the process after it enters the trench.

RE: Corrosion Resistant Fasteners

why can't / don't you use an angle made from vinyl ester frp? currently making many parts similar to this application for an electro galvanize line...works beautifully...
plasticfreq

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