Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old February 21st 05, 09:36 AM
Peter Fairbrother
 
Posts: n/a
Default Removing zinc/cadmium plating?

Is there an easy way to remove zinc and/or cadmium plating without affecting
the steel underneath?


Thanks,


--
Peter Fairbrother


  #2   Report Post  
Old February 21st 05, 01:51 PM
Karl Townsend
 
Posts: n/a
Default


Is there an easy way to remove zinc and/or cadmium plating without
affecting
the steel underneath?


Zinc comes right off with muratic (HCL) acid. The steel will rust
immediately if you don't take steps to prevent that. Makes nasty fumes, do
it outside and stand upwind.

Karl



  #3   Report Post  
Old February 21st 05, 04:27 PM
Grant Erwin
 
Posts: n/a
Default

Peter Fairbrother wrote:

Is there an easy way to remove zinc and/or cadmium plating without affecting
the steel underneath?


Very easy. Go to the supermarket where they sell cleaners and find a can of
Red Devil lye. That's about a pound give or take. Add it to about four gallons
of water and drop your parts in overnight. The zinc will be entirely gone and
if there was any rust on the steel that will be gone too. You can certainly
use acid but I don't like to use acid for this because the acid eats the steel
too and you have to really worry about neutralizing it. The lye doesn't eat the
steel so if you leave it in too long it doesn't hurt anything, plus the rust
gets chemically reduced back to iron, not eaten away.

It's nice if you neutralize the chemical before disposing of it. Don't dump
it into a storm sewer, make sure it finds its way to a sewer treatment plant.

I have done this myself, recently, worked perfectly. Be aware that whether you
use a base (lye) or an acid (e.g. muriatic) one splash can blind you, so wear
goggles, use good chemical proof gloves, and wear old clothes, and don't do
this anywhere near where animals or small children go.

GWE
  #4   Report Post  
Old February 21st 05, 10:15 PM
Peter Fairbrother
 
Posts: n/a
Default

Grant Erwin wrote:

Peter Fairbrother wrote:

Is there an easy way to remove zinc and/or cadmium plating without affecting
the steel underneath?


Very easy. Go to the supermarket where they sell cleaners and find a can of
Red Devil lye.


Just checking, that is sodium hydroxide? I'm in the UK and I don't think we
have that brand here (though we do have a "Red Devil" brand of small power
tools, vaccuum cleaners and the like).

I had wondered whether NaOH would work on zinc, and I agree that it would be
better for not eating the steel. I'll give it a try. Thanks.





--
Peter Fairbrother

  #5   Report Post  
Old February 21st 05, 10:20 PM
Dave Hinz
 
Posts: n/a
Default

On Mon, 21 Feb 2005 22:15:05 +0000, Peter Fairbrother wrote:
Grant Erwin wrote:

Peter Fairbrother wrote:

Is there an easy way to remove zinc and/or cadmium plating without affecting
the steel underneath?


Very easy. Go to the supermarket where they sell cleaners and find a can of
Red Devil lye.


Just checking, that is sodium hydroxide?


In the USA, yes, it is.

I'm in the UK and I don't think we
have that brand here (though we do have a "Red Devil" brand of small power
tools, vaccuum cleaners and the like).


Here, those are Dirt Devil, but yes they're red.




  #6   Report Post  
Old February 21st 05, 10:40 PM
bamboo@localnet.com
 
Posts: n/a
Default

Once you fill that lye solution with zinc and cadmium salts it ain't
supposed to go down the drain, at least not anywhere in the states.

  #10   Report Post  
Old February 22nd 05, 02:24 AM
Grant Erwin
 
Posts: n/a
Default


Zinc isn't the problem.

Steve


Then what is? - GWE


Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Removing corkboard tiles from a wall JA Home Repair 1 January 29th 05 07:15 AM
Chrome Plating question invntrr Metalworking 12 December 5th 04 04:03 AM
Antique metal plating question jim Metalworking 13 September 3rd 03 09:00 PM
Removing Caulk PC Woodworking 2 August 2nd 03 04:29 PM
Copper plating Dan Caster Metalworking 5 July 24th 03 01:04 PM


All times are GMT +1. The time now is 06:32 PM.

Powered by vBulletin® Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2004-2017 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017