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? 4 chemist

Geo-TH,In

Geo-TH,In

Well-known Member
What do you get if you mix about 2 oz of concentrated HCl (muriatic acid) with 16 oz of water and put a large rusty/cement coated metal trowel in solution for 48 hours?
 
Dave is about right, although the wooden handle may be seriously degraded!

Another answer: rusty water!

HCl is a pretty tough customer on calcium based materials (concrete), as well as metals.

Might better throw it away and get a new one.

(And yeah, I have a degree in Chemistry!)
 
IIRC from my chemistry days. Muriatic acid is a weak concentration of HCl. So I would ask are you using concentrated HCl (high molar) or Muriatic acid (low molar)?

Both should attack the cement and rust.

Rick
 
This pic is what happened after trowel was in dilute HCl for 48 hours. Only the metal was in contact with the acid. It was in a plastic tub.

Tried grinding off rust, too many pits. Can't see throwing away a prefectly good trowel.

Chemist, why do you think the trowel looks like it has a light gray coat of primer and not rust?

George
a87085.jpg
 
Several years ago I used aircraft cable for trap attachments to movable objects--drags. Muradic acid took the galvanizing off, leaving a light gray strand. It laid well in the water hiding it from critters and thieves.

Larry
 
used mueratic acid on galvanized half round gutters to be able to paint them as soon as installed. very weak solution.
 
Here is what happens when iron ore and HCl come in contact.

Fe3O4(s) + 8 HCl(aq) ¨ FeCl2(aq) + 2 FeCl3(aq) + 4 H2O

So I think I may have converted rust into Iron Chloride using muriatic acid.

Going to experiment and see how well paint sticks to FeCl3.

George
 
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