13 Oct
2009
13 Oct
'09
2:17 p.m.
Hi, All,
Some of the equipment I have has been through the wringer before it
got to me so I have a couple of items of unpainted, galvanized steel
where the galvanization is gone in patches larger than your hand and
the steel underneath has oxidized to black (not so bad) or red (not so
good). At the moment, I'm dealing with a single-board-computer "base"
and a semi-custom rack shelf that both need some help. I know I can
treat red iron oxide (rust) with naval jelly, but then I still have
bare steel with no galvanization. I'm not expecting to get a
cosmetically perfect item, but is there a good way to restore/protect
things like this, or should I just expect to paint the entire item (it
would look strange to just paint the formerly-galvanized area).
Obviously, descaling, sanding and painting is one way to deal with
this. I'm looking for possible alternatives.
Thanks for any suggestions or pointers,
-ethan
13 Oct
13 Oct
2:26 p.m.
New subject: Any experience with or recommendations on restoring rusted galvanized steel?
in clocks and some museum work a wax can be applied, takes the shine
off slightly so may look ok or maybe re galvanise it.
will have to be pretty clean for re galvanising though, platers
probably will go though a strip bath to chemically clean it.
Dave Caroline
2:30 p.m.
New subject: Any experience with or recommendations on restoring rusted galvanized steel?
On steel used in electronics, its probably got a conversion coating
treatment (anodized, etc).
I would use a "buffered" phosphoric acid metal prep solution to
dissolve and convert the rust and it will leave a phosphate surface
conversion that will inhibit rust and give tooth for any future paint
coating.
Sold in paint stores, auto paint, and even "large" building stores.
A gallon is like $15 us.
You can dip parts or for larger ares, lay some wet paper towels on the
area to be treated. I use a spray bottle to mist areas to be
treated.
Keep an eye on it so it does not eat more than the rust, wipe it off
before it dries, hard on your hands, and will eat lots of neat looking
holes in your pants. Also found in Coca Cola.
take your time and practice on something not too important.
Navel Jelly I suspect is some kind of Tanic acid/phosporic acid gel.
On Tue, Oct 13, 2009 at 4:17 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
Hi, All,
Some of the equipment I have has been through the wringer before it
got to me so I have a couple of items of unpainted, galvanized steel
where the galvanization is gone in patches larger than your hand and
the steel underneath has oxidized to black (not so bad) or red (not so
good). ?At the moment, I'm dealing with a single-board-computer "base"
and a semi-custom rack shelf that both need some help. ?I know I can
treat red iron oxide (rust) with naval jelly, but then I still have
bare steel with no galvanization. ?I'm not expecting to get a
cosmetically perfect item, but is there a good way to restore/protect
things like this, or should I just expect to paint the entire item (it
would look strange to just paint the formerly-galvanized area).
Obviously, descaling, sanding and painting is one way to deal with
this. ?I'm looking for possible alternatives.
Thanks for any suggestions or pointers,
-ethan
3:03 p.m.
New subject: Any experience with or recommendations on restoring rusted galvanized steel?
On 13 Oct 2009 at 17:17, Ethan Dicks wrote:
Obviously, descaling, sanding and painting is one way
to deal with
this. I'm looking for possible alternatives.
You're on the right track. Krylon has a good zinc-rich galvanize-
appearance paint:
http://www.caswellplating.com/vht/galvanizpaint.html
You can also electroplate zinc:
http://www.caswellplating.com/kits/zinc.htm
Electroless nickel is another option (see the site above) and may be
more durable than zinc and easier to apply.
In my misspent youth, I worked as a tech in a steel mill and the
continous galvanize line (as well as the tinplate lines) were on my
route. Lots of very nasty hot chemicals (e.g. chromic acid); the
galvanize line used a hydrogen atmosphere...
--Chuck
3:49 p.m.
New subject: Any experience with or recommendations on restoring rusted galvanized steel?
Similar:
http://alvinproducts.com/Products/Products.asp?id=4
Works quite well.
Chuck Guzis wrote:
On 13 Oct 2009 at 17:17, Ethan Dicks wrote:
Obviously, descaling, sanding and painting is one
way to deal with
this. I'm looking for possible alternatives.
You're on the right track. Krylon has a good zinc-rich galvanize-
appearance paint:
http://www.caswellplating.com/vht/galvanizpaint.html
You can also electroplate zinc:
http://www.caswellplating.com/kits/zinc.htm
Electroless nickel is another option (see the site above) and may be
more durable than zinc and easier to apply.
In my misspent youth, I worked as a tech in a steel mill and the
continous galvanize line (as well as the tinplate lines) were on my
route. Lots of very nasty hot chemicals (e.g. chromic acid); the
galvanize line used a hydrogen atmosphere...
--Chuck
5548
days inactive
5548
days old
4 comments
5 participants
participants (5)
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cclist＠sydex.com -
dave.thearchivist＠gmail.com -
ethan.dicks＠gmail.com -
rollerton＠gmail.com -
steve＠radiorobots.com