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rule of thumb for rivets? #145888
06/16/08 07:09 AM
06/16/08 07:09 AM
Joined: Sep 2004
Posts: 99
Virginia Beach
Sunvista Offline OP
journeyman
Sunvista  Offline OP
journeyman

Joined: Sep 2004
Posts: 99
Virginia Beach
Is there a "rule of thumb" for blind riveting two dissimilar materials like stainless to aluminum? For example, riveting a stainless mast hinge or block hanger to an aluminum mast or boom. Would I use an aluminum or stainless rivet?

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Re: rule of thumb for rivets? [Re: Sunvista] #145889
06/16/08 07:31 AM
06/16/08 07:31 AM
Joined: Jun 2001
Posts: 975
South Louisiana, USA
Clayton Offline
old hand
Clayton  Offline
old hand

Joined: Jun 2001
Posts: 975
South Louisiana, USA
Monel

Re: rule of thumb for rivets? [Re: Clayton] #145890
06/16/08 08:04 AM
06/16/08 08:04 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
yup - monel...though stainless will work fine. Goop up the rivet and hole with 5200 before setting it...it won't necessarily stop the electrolysis but it will keep water from pooling between the materials.


Jake Kohl
Re: rule of thumb for rivets? [Re: Sunvista] #145891
06/16/08 11:16 AM
06/16/08 11:16 AM
Joined: Oct 2002
Posts: 1,226
Atlanta
bvining Offline
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bvining  Offline
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Atlanta
Just dont rivet aluminum to carbon, and dont use aluminum rivets in carbon.

Too far apart on the electron swapping scale.

Re: rule of thumb for rivets? [Re: bvining] #145892
06/16/08 02:24 PM
06/16/08 02:24 PM
Joined: Nov 2003
Posts: 749
Santa Cruz, CA
SurfCityRacing Offline
old hand
SurfCityRacing  Offline
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Santa Cruz, CA
You might find it helpful to use something like Calpico tape under the hardware to curb the corrosion between the mast and fitting. And glue/seal in rivet caps before you set the rivet if you want to make sure it's water tight.

Re: rule of thumb for rivets? [Re: SurfCityRacing] #145893
06/16/08 03:24 PM
06/16/08 03:24 PM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
Carpal Tunnel

Joined: Dec 2001
Posts: 5,590
Naples, FL
Quote
You might find it helpful to use something like Calpico tape under the hardware to curb the corrosion between the mast and fitting. And glue/seal in rivet caps before you set the rivet if you want to make sure it's water tight.


Not sure I understand that "glue/seal in rivet caps before you set the rivet"

Care to elaborate?


Jay

Re: rule of thumb for rivets? [Re: waterbug_wpb] #145894
06/16/08 03:50 PM
06/16/08 03:50 PM
Joined: Nov 2003
Posts: 749
Santa Cruz, CA
SurfCityRacing Offline
old hand
SurfCityRacing  Offline
old hand

Joined: Nov 2003
Posts: 749
Santa Cruz, CA
[Linked Image]

This is a rivet cap or casing. Most rivets used on beach cats are 3/16" monel rivets. A common use is to attach tangs and other fittings on hollow extrusions (masts). To keep water from going through the mandrel hole on the rivet, most manufactures/ repair guys etc. use rivet caps. It's a little more reliable than a dab of silicone. These go under the hardware and require that you use a 13/64" drill rather than a 3/16". The rivets then go into these caps. I always dab silicone on them before putting them in. Another benefit is that there is aluminum contacting your aluminum mast, and the cap, not the mast will act as the sacrificial anode--sort of.

Hope that helps.

Re: rule of thumb for rivets? [Re: SurfCityRacing] #145895
06/16/08 04:01 PM
06/16/08 04:01 PM
Joined: Sep 2004
Posts: 33
U
ucfsailor19 Offline
newbie
ucfsailor19  Offline
newbie
U

Joined: Sep 2004
Posts: 33
You would want to use a stainless steel rivet, and the reason for that is the cathode to anode ratio. Since aluminum is the anode when mated with stainless, a small aluminum rivet compared to a much larger piece of stainless will make the aluminum rivet corrode fast.

http://www.ocean.udel.edu/seagrant/publications/corrosion.html

Re: rule of thumb for rivets? [Re: ucfsailor19] #145896
06/16/08 04:57 PM
06/16/08 04:57 PM
Joined: Sep 2004
Posts: 99
Virginia Beach
Sunvista Offline OP
journeyman
Sunvista  Offline OP
journeyman

Joined: Sep 2004
Posts: 99
Virginia Beach
Thanks for the explanation. I would have thought the opposite though for another reason. In other words, one would want the formed, blind side of the rivet to be the same as the material being riveted. I'm attaching a stainless block hanger to an aluminum boom. The galvanic action would be nil at the attachment or grip point if both the aluminum rivet and boom are the same material. Wouldn't the grip point of the fastener be the most critical area rather than the head of the rivet?

Re: rule of thumb for rivets? [Re: Sunvista] #145897
06/16/08 08:50 PM
06/16/08 08:50 PM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
Pooh-Bah
catman  Offline
Pooh-Bah

Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
You might also try tef-gel to coat the rivet/ alum. joint.


Have Fun
Re: rule of thumb for rivets? [Re: catman] #145898
06/17/08 05:13 AM
06/17/08 05:13 AM
Joined: Jun 2001
Posts: 75
Ljubljana, Slovenia
mayhem Offline
journeyman
mayhem  Offline
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Joined: Jun 2001
Posts: 75
Ljubljana, Slovenia
See earlier discussion about rivets and dissimilar materials.

http://www.catsailor.com/forums/showflat...true#Post142319


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