Cleaning zinc off 316ss with HCl 1

[Murdul]

I want to clean the zinc off a sink roll in a galv line pot using an HCl bath. The roll would be dipped in a 15% HCl concentration to remove the zinc. I am assuming we will still need to machine the surface once we remove the roll? I want to know if the HCl could be corosive enough to cause damage more than 3/1000 below the surface?

 

[EdStainless]

Yes. You could roughen the 316 deeper than you want to. What about other acids?

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[Murdul]

thanks EdStainless

We have the HCl already and we want to keep cost to a minimum. right now we machine about 40/1000 off the rolls. so even 10 would be a lot better.

 

[kenvlach]

The Metal Finishing Guidebook (p. 395 in 2006 Edn.) lists inhibited, 25 vol% hydrochloric acid at 120^oF for stripping zinc from copper & steels.
Also, 15 wt% ammonium nitrate at room T.
Also, can anodic strip in 10 (w/v)% NaOH at 4 V, using steel anodes at room T.

Nitric acid would be best.

 

[unclesyd]

If you use HCl I would add an inhibitor to mitigate any corrosion to the SS. You should be a able to get an inhibitor from your supplier of the HCl.