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 Catalina 25 Specific Forum
 Stainless Rivets		  New Topic  Topic Locked
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juswalk
1st Mate

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USA
34 Posts
Initially Posted - 02/06/2013 :  17:35:26  Show Profile
I am about to install a lazy jack kit and want to use pop rivets to attach the stainless hardware to the aluminum mast and boom. I can use aluminum or stanless rivets, either way I will have dissimilar metals touching. Is there a better way to do this or perhaps a coating or gasket that is typically used for this sort of thing?
Thanks!
Hull#5484 1986 Catalina 25 TR/FK "Lorelei" NAS Pensacola
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 02/06/2013 :  18:51:27  Show Profile
This is a low load application - I'd use aluminum rivets. Other than LocTite (blue) I have never heard of a coating as you describe.

If you do use stanless rivets (very tenacious!) you will need a rivet gun rated for steel.
Edited by - OJ on 02/07/2013 17:36:00
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britinusa
Web Editor

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5404 Posts
Response Posted - 02/06/2013 :  19:13:59  Show Profile  Visit britinusa's Homepage
In the Navy (RN) we used to prevent dissimilar metal corrosion by using a seal between the surfaces (this was on helicopter panels) and it was very effective. So using a surface separator such as butyl it would seem to be worth the effort. Of course, some metal to metal connection is most likely, minimizing it would seem prudent.

Paul
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OLarryR
Master Marine Consultant

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USA
3467 Posts
Response Posted - 02/07/2013 :  04:20:06  Show Profile  Visit OLarryR's Homepage
It is true that you will have dis-similar materials and a source of corosion/oxidation. However, I believe there are SS fittings on the mast (anodized aluminum) that utilize SS machine screws, for example, the screws that hold internal halyard blocks. Having said that, I also had concerns regarding the aluminum support brackets (non-anodized aluminum) that I made to support my solar panel. I used SS screws to hold the aluminum support together and was concerned with with using the aluminum supports(not anodized) and in addition, the use of the SS screws. I bought Industrial Grade Rustoleum Enamel primer and paint spray and applied to the aluminum supports. My website has some of the details. But here is one photo of the painted aluminum supports.

Edited by - OLarryR on 02/07/2013 04:43:53
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hewebb
Admiral

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USA
761 Posts
Response Posted - 02/07/2013 :  06:36:46  Show Profile
When installing dissimilar metals use any paint or clear urethane in the installation and you will solve the problem. Install fasteners with wet paint or urethane.
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juswalk
1st Mate

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USA
34 Posts
Response Posted - 02/07/2013 :  16:38:50  Show Profile
Thanks for all of the tips guys. I also noticed a mix of fasteners and hardware already installed on the boom and mast but was not sure if they were somehow coated prior to installation.

On our aircraft zinc chromate is typical for dissimilar metals contact. I see that jamestown distributors carries it as well.

Thanks again, cant wait to get this mod installed if should be very handy!
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.