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chrome plate removal from aluminum engine covers #327194
08/09/10 1:13 am
08/09/10 1:13 am
Joined: Apr 2007
Posts: 528
Southeast Usa
B
Bigtwin Offline OP
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Bigtwin  Offline OP
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Joined: Apr 2007
Posts: 528
Southeast Usa
Hello!
Any experience out there regarding the best way to strip chrome plate from aluminum engine covers? Corrosion has blistered the surface & some peeling has started. Is it possible for a chrome shop to reverse the process or are we talking lots of sanding, blasting, & elbow grease? any ideas, folks?

Thanks,

Bigtwin

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Re: chrome plate removal from aluminum engine covers [Re: Bigtwin] #327196
08/09/10 1:28 am
08/09/10 1:28 am
Joined: Jan 2007
Posts: 252
Atlanta, Georgia
Atlanta Bonnie Offline
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Atlanta Bonnie  Offline
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Posts: 252
Atlanta, Georgia
When I restored my 68 Bonnie, I had a few items re-chromed.

The shop also un-chromed several parts at "no charge" that were not originally chromed, but had been over the years and were looking pretty rough. Took 30 minutes or so in their tank. Aluminum will need a good polish after that process though.


Bruce


Re: chrome plate removal from aluminum engine covers [Re: Atlanta Bonnie] #327211
08/09/10 5:35 am
08/09/10 5:35 am
Joined: Mar 2002
Posts: 531
NY
OriginalScott Offline
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OriginalScott  Offline
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Posts: 531
NY
It is pretty inexpensive and any chrome shop should be able to do it. They dip it into an electricaly charged bath and the old chrome melts off.
Scott

Re: chrome plate removal from aluminum engine covers [Re: OriginalScott] #327294
08/09/10 4:35 pm
08/09/10 4:35 pm
Joined: May 2005
Posts: 146
Lyons, NY
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Britishtools Offline

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Britishtools  Offline

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Joined: May 2005
Posts: 146
Lyons, NY
Reverse chrome plating is exactly that...

A chrome plating shop uses the same baths but just reverses the charge.

You can also bead blast chrome off but it is very difficult and takes a long time.

Re: chrome plate removal from aluminum engine covers [Re: Britishtools] #327301
08/09/10 4:54 pm
08/09/10 4:54 pm
Joined: Aug 2001
Posts: 3,348
Michigan, USA
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance

Joined: Aug 2001
Posts: 3,348
Michigan, USA
I have had a few things dechromed at the plater that does my chroming . When I got the pieces back they were pretty nasty looking with a sorta black oxidation in some areas , I would recomend having the plater polish them when they are finished unless you enjoy that type of work .

FWIW-BONZO

Re: chrome plate removal from aluminum engine covers [Re: BONZO R.I.P.] #327304
08/09/10 5:07 pm
08/09/10 5:07 pm
Joined: May 2005
Posts: 146
Lyons, NY
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Britishtools Offline

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Lyons, NY
Originally Posted By: BONZO
I have had a few things dechromed at the plater that does my chroming . When I got the pieces back they were pretty nasty looking with a sorta black oxidation in some areas , I would recomend having the plater polish them when they are finished unless you enjoy that type of work .

FWIW-BONZO


I think it is also important for people to know that with regards to true, triple chrome plating, they will be left with nicket plated parts if they choose to reverse plate the chrome off.

Re: chrome plate removal from aluminum engine covers [Re: Britishtools] #328446
08/16/10 6:01 pm
08/16/10 6:01 pm
Joined: Apr 2007
Posts: 528
Southeast Usa
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Bigtwin Offline OP
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Bigtwin  Offline OP
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Posts: 528
Southeast Usa
Hi, folks!
Thanks for the input! I have not been to the chrome shop for de-chroming...yet, since the nearest one is easily 60 miles away. However, that might make the most sense timewise. I spent a couple of hours bead blasting, sanding, & otherwise improvising methods to strip the plating. After all this effort I am just now down to the copper with the dark blotches remaining where corrosion had penetrated and blistered under the plating. I would hope the chrome shop could just as easily reverse the nickle and then the copper process. So, as an FYI, this has been a very time consuming process. Once through the copper, I hope a good buffing will get the black spots out...or maybe something like Brasso or some similar tarnish remover. Geesh! Thanks again for the input!

Bigtwin

Re: chrome plate removal from aluminum engine covers [Re: Bigtwin] #328496
08/16/10 10:40 pm
08/16/10 10:40 pm
Joined: Jun 2002
Posts: 10,233
Scotland
S
Stuart Offline
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Stuart  Offline
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Joined: Jun 2002
Posts: 10,233
Scotland
Hi,

Originally Posted By: Bigtwin
I have not been to the chrome shop for de-chroming...yet, since the nearest one is easily 60 miles away. However, that might make the most sense timewise.

Ime, it would.

1. The copper and nickel under good chrome is deposited on an article in exactly the same way as the chrome, so of course a chromer can remove them by reversing the process.

2. Trying to bead-blast off chrome just breaks up the beads and bu**ers the machine. Been there, done that, ... Not to mention imho it's a bad idea to bead-blast relatively soft sand-cast alloy, especially if it has oilways in it.

3. The basis and cost of good plating isn't the plating but the quality of the polishing beforehand. Therefore, any good chromer will have good polishing facilities, capable of removing anything in minutes that'd take you hours with Brasso or whatever.

Hth.

Regards,

Re: chrome plate removal from aluminum engine covers [Re: Stuart] #328594
08/17/10 1:24 pm
08/17/10 1:24 pm
Joined: Apr 2007
Posts: 528
Southeast Usa
B
Bigtwin Offline OP
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Bigtwin  Offline OP
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Joined: Apr 2007
Posts: 528
Southeast Usa
Hi & thanks!
Looks like a road trip is in order! Fortunately, I am only dealing with primary covers at the moment, so no oil passages to get clogged. On the other hand, I also have some timing covers with paassages , pumps, bushings & the like to be done. Bead blasting is definitely out of the question for those. I hadn't pondered the chrome cracking up the beads & diminishing the effectiveness of the machine! Curse the folks who chromed these bits in the first place!!! Oops! That is probably a bit uncharitable, so better to say, curse the high humidity environment around here! Thanks for the response!

Bigtwin


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