Muriatic Acid

Status
Not open for further replies.
C

challey71e

Promoted Users
I've used it before on junky stuff to get the rust off. It is quite powerful compared to Ospho, been kind of wondering if it may be useful to try muriatic acid, neutralize with water, then oshpo and neutralize with water and then prime?

Anyone tried it before? Sometimes the ospho just doesn't have enough to get the rust totally out.
 
Muriatic acid has one use in my shop and that’s for dissolving zinc plating on hardware so I can weld it or replate or.

The vapor from muriatic acid will make things rust in your shop. It’s very corrosive.

I’m sure there’s a Facebook paint group that will tell you to use muriatic acid on a car though!
 
hell no! a leaking bottle of that shit will destroy everything in your shop. water alone will not stop it. put that crap in your pool.
 
lol i have to admit i have used muriatic acid on quite a few occasions. does it work, yes but damn, these guys are right. the rate that rust comes back is insane. it literally takes less than a minute after a rinse off and rust is back. not only that, its dangerous as hell. one whiff and you scorch your lungs. i could see you using it on heavy rust then rinse well and move on to something else but really if your going to do all that you might as well blast. you really cant beat the blasting process as a prep for paint
 
i use it to clean up rusted bolts. but you better not be standing down wind , because it will knock you down., quick and fast, just likea bucket of chlorine tabs must wear a respirator, and not some dust mask either.
 
Barry said:
My question would be, how do you neutralize it on metal to stop embrittlement?

It has no place on a car, especially a unibody.
Click to expand...
This stuff can't be deluted enough to just rinse away like Phosphoric acid, that would just be like pouring acid down the drain. Think about when cars used vented fill caps, and those fumes from the battery acid would rust the area around the battery, including battery cable clamp bolts, battery hold down, and anything else close by. What everybody did was pour a solution of baking soda and water on everything to neutralize the acid, because a strong acid has to neutralized. But I'm not sure that totally gets rid of it.

Many years ago I had an engine block and heads cleaned at a place that does rust removal dipping for car parts and even whole bodies, and when I went to pick up the engine from the machine shop, he complained about it rusting very quickly after each time he rinsed following each machining procedure that he did. Thats the result I got from a professional rust removal business, which I later found out that they used Mutiatic acid.
 
chevman said:
This stuff can't be deluted enough to just rinse away like Phosphoric acid, that would just be like pouring acid down the drain. Think about when cars used vented fill caps, and those fumes from the battery acid would rust the area around the battery, including battery cable clamp bolts, battery hold down, and anything else close by. What everybody did was pour a solution of baking soda and water on everything to neutralize the acid, because a strong acid has to neutralized. But I'm not sure that totally gets rid of it.

Many years ago I had an engine block and heads cleaned at a place that does rust removal dipping for car parts and even whole bodies. When I went to pick up the engine from the machine shop, he complained about it rusting very quickly after each time he rinsed following each machining procedure that he did. Thats the result I got from a professional rust removal business, which I later found out that they used Mutiatic acid.
Click to expand...
Well said exactly, use on cement, never are car.
 
That is only practical info and really doesn't apply totally in the automotive unibody.
If only we knew the lawyer that settled out of court for a few million because of the wrong acid used; of course, it was sealed, so there was no public info. That's all I need to know.

EDIT:
Because of the liability and danger of using muriatic acid on a car, im going to lock this thread.
I think the thread was good and pretty well covered. Why not use it, I dont want this to get diluted up and confuse a newbie.
 
Last edited:
Status
Not open for further replies.
Back
Top