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10-02-2013, 01:23
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#1
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Marine Service Provider
Join Date: Jan 2013
Location: Seattle area
Posts: 58
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Mounting stainless steel on aluminum
Lately, I have been supplying quite a few compressors and scuba tank fill panels to owners that are either building new or are retrofitting the all aluminum boats. However, I recently had two orders canceled because we use stainless instead of aluminum for the panel.
Since I have only done one installation and shipped off the rest to builders/refitters, I am not quite sure what is being used normally for insulation between the stainless and aluminum to minimize galvanic corrosion.
We used simple nylon insulating washers. Is there something different that the boating community uses that we can suggest instead?
__________________
Ray Contreras
CompressorStuff
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10-02-2013, 03:08
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#2
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Registered User
Join Date: Apr 2012
Location: Towcester, England
Boat: Dufour 36' Classic
Posts: 27
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We have recently replaced some outlet plates with stainless steel equivalents on our aluminium mast and used Duralac Barium Chromate paste to isolate the two dissimilar metals, this is widely used in the marine industry to prevent corrosion. I hope this helps. Regards Magnum
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11-02-2013, 17:47
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#3
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: Mounting stainless steel on aluminum
Tef Gell Comes in little tubes that you could send with the parts.
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11-02-2013, 18:25
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#4
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Marine Service Provider
Join Date: Jan 2013
Location: Seattle area
Posts: 58
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Re: Mounting stainless steel on aluminum
I found both items and they both sound great if we were screwing stainless into aluminum. However, it really sounds like they are both primarily anti seize. I will keep them in mind for some of our other projects.
However, what the owners are concerned about is where the flange of the filler panel comes in contact with the bulkhead ... not the holes.
From the picture, you can see the 1" flange where we drill holes so that it can be bolted to the bulkhead. On the one installation I did, I used nylon insulating washers for the four holes and it made the panel stand out a tiny bit from the bulkhead. The owner didn't notice it until I said something and he told me I was being too picky. But, that's just me!
Will the grease/gel work here? I guess my question should be what should I put between the flat to flat parts?
__________________
Ray Contreras
CompressorStuff
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11-02-2013, 18:29
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#5
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: Mounting stainless steel on aluminum
Tef gel is not just an anti-sieze it has body and does not flow. It would work fine as a barrier between 2 flat surfaces, In my experience.
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11-02-2013, 18:31
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#6
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Registered User
Join Date: Aug 2007
Location: In boat fixing' season I'm in a Maryland boat yard too close to Washington, DC ... except when I escape to home on the beach in Florida!
Boat: Prout Snowgoose 34
Posts: 175
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Re: Mounting stainless steel on aluminum
I believe that butyl tape is a simple solution for this application.
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11-02-2013, 18:32
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#7
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Mounting stainless steel on aluminum
Quote:
Originally Posted by rcontrera
I found both items and they both sound great if we were screwing stainless into aluminum. However, it really sounds like they are both primarily anti seize. I will keep them in mind for some of our other projects.
However, what the owners are concerned about is where the flange of the filler panel comes in contact with the bulkhead ... not the holes.
From the picture, you can see the 1" flange where we drill holes so that it can be bolted to the bulkhead. On the one installation I did, I used nylon insulating washers for the four holes and it made the panel stand out a tiny bit from the bulkhead. The owner didn't notice it until I said something and he told me I was being too picky. But, that's just me!
Will the grease/gel work here? I guess my question should be what should I put between the flat to flat parts?
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You could mount the panel to a plastic or wooden plate and send with. And then they can mount the plastic/wood to their boat.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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11-02-2013, 18:41
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#8
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Marine Service Provider
Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,974
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Re: Mounting stainless steel on aluminum
In this case the mounting bolts need tuff gel, and between the flange and the hull there needs to be an isolater. I would think a full leingth strip of 1/16 starboard (or gasket material) would be ideal.
__________________
Greg
- If animals weren't meant to be eaten then they wouldn't be made of food.
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11-02-2013, 18:48
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#9
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Registered User
Join Date: Nov 2011
Location: Fethiye Turkey
Boat: Lagoon 440
Posts: 2,954
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Re: Mounting stainless steel on aluminum
Whatever you bolt-up to untreated metal of any type (almost) where there's a flange/thread involved it will possibly allow a cell to become active where moisture and dust can microscopically accumulate.
The Duralac that Magnum refers is very good and is my choice, the thin nylon/teflon washers you used are a great idea, but just seal with Duralac by brushing on, in the mated area and it will not let you down.
It must be re-coated if unbolted in the future. I've retired from metal boatbuilding but continue to use Duralac on our current boats ally and SS.
Cheers there may be similar products.
__________________
"Political correctness is a creeping sickness that knows no boundaries"
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11-02-2013, 18:49
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#10
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Registered User
Join Date: Nov 2011
Location: Fethiye Turkey
Boat: Lagoon 440
Posts: 2,954
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Re: Mounting stainless steel on aluminum
Quote:
Originally Posted by delmarrey
You could mount the panel to a plastic or wooden plate and send with. And then they can mount the plastic/wood to their boat.
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Woods not good Delmarrey it will hold moisture like a sponge and will no doubt have acidic Tannins etc in it.
Wood straight on any metal is corrosion city.
Cheers.
__________________
"Political correctness is a creeping sickness that knows no boundaries"
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11-02-2013, 18:50
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#11
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Registered User
Join Date: Nov 2011
Location: Fethiye Turkey
Boat: Lagoon 440
Posts: 2,954
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Re: Mounting stainless steel on aluminum
Quote:
Originally Posted by svtrio
I believe that butyl tape is a simple solution for this application.
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Carbons in Butyl tape will or may attack the ally.
Cheers.
__________________
"Political correctness is a creeping sickness that knows no boundaries"
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11-02-2013, 19:01
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#13
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Mounting stainless steel on aluminum
Quote:
Originally Posted by Lagoon4us
Woods not good Delmarrey it will hold moisture like a sponge and will no doubt have acidic Tannins etc in it.
Wood straight on any metal is corrosion city.
Cheers.
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Yeah! I agree!
In my mind I was thinking wood coated in epoxy, I just didn't state that.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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11-02-2013, 19:07
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#14
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Registered User
Join Date: Nov 2011
Location: Fethiye Turkey
Boat: Lagoon 440
Posts: 2,954
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Re: Mounting stainless steel on aluminum
The epoxy is good but you'll still need to protect the ally where the natural oxides fail. Duralac can be relied on it is simply good stuff, like Vegemite essential!
Cheers
__________________
"Political correctness is a creeping sickness that knows no boundaries"
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12-02-2013, 22:49
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#15
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Marine Service Provider
Join Date: Jan 2013
Location: Seattle area
Posts: 58
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Re: Mounting stainless steel on aluminum
Thanks all for the feedback. I really can't bolt on a plastic or wood back as that would make annual maintenance (checking all fittings and connections) more difficult.
I will pass on the information.
__________________
Ray Contreras
CompressorStuff
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