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04-21-2016, 06:04 AM
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#1
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Senior Member
City: Thorndike
Vessel Name: Periwinkle
Vessel Model: Gulfstar 36
Join Date: Jun 2012
Posts: 137
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Anodes, aluminum, zinc, magnesium?
Ok, we sail the Periwinkle from fresh water to salt water for the summer and then back to salt. Consequently I want to use aluminum anodes due to the coating that is produced on zinc anodes with this type of operation. I also know the all need to be the same. But, what about engine anodes and the plate located on bottom of vessel? Is it an anode? It shows no degeneration. Is that a zinc anode that isn't working or a ground. If it is an anode can I get it in aluminum? If so where?
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04-21-2016, 06:42 AM
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#2
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,681
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We're 100% Aluminum now. We go from brackish to salt plus this year Hobo also spent time in fresh water. We have a 5" circular anode on the rudder, an anode on the prop, a plate anode on the transom plus a pencil anode in the heat exchanger. I have been told that your boat should have all the same. I think someone recently posted that the type you use in the heat exchanger can be different since that is not typically tied in to the bonding system. We went all the same since they are available.
We buy everything from Boatzincs.com except the pencil anode which we by from Performace Metals.
BoatZincs.com (978-841-9978) - The Online Superstore for Zinc Anodes
Rudder Trim Tab Anodes
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04-21-2016, 07:44 AM
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#3
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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A couple of years ago when aluminum anodes start there was a discussion, that alluminum was more protective than zinc. When talk working with metal its the galvanic rating that is important. The lower the rating the more it protect metal of higher rating. So zinc usually protect aluminum, and aluminum protect mild steel. So before you switch make sure you know and compare the galvanic rating. I heard they where going to stop making zinc, so I bought 2 sets of true zincs which should last another 6 years. I am not a believer yet.
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04-21-2016, 08:08 PM
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#4
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,826
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I believe SidePower thrusters have gone 100% to Alum anodes.
They state there is no problem when mixing w/ other mat'ls for boat anodes because the thrusters are isolated.
I read the same about all anodes being the same - when I moved my boat I went 100% w/ alum including engine / gen anodes.
Note the Alum anodes are not 100% Alum they are an alloy w/ small amts of other metals and claim to protect alum components.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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04-21-2016, 09:31 PM
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#5
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Guru
City: Signal Mtn., TN
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,742
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Quote:
Originally Posted by kpinnn
Ok, we sail the Periwinkle from fresh water to salt water for the summer and then back to salt. Consequently I want to use aluminum anodes due to the coating that is produced on zinc anodes with this type of operation. I also know the all need to be the same. But, what about engine anodes and the plate located on bottom of vessel? Is it an anode? It shows no degeneration. Is that a zinc anode that isn't working or a ground.[/COLOR] If it is an anode can I get it in aluminum? If so where?
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Are you by chance talking about a sintered bronze grounding plate for an SSB radio or lightning protection? We have 2 plates on the hull that I struggled to identify until the yard manager told me what they were and why they look different than the aluminum anodes.
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04-22-2016, 09:31 AM
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#6
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Guru
City: North Charleston, SC
Join Date: Sep 2010
Posts: 4,870
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Quote:
Originally Posted by Phil Fill
.......... I heard they where going to stop making zinc, so I bought 2 sets of true zincs which should last another 6 years ...............
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Where did you hear that and what is the supposed reason?
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04-22-2016, 03:12 PM
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#7
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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On our Loop boat we are 100% aluminum.
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04-22-2016, 03:32 PM
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#8
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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Try this
Whatever happened to fstbttms anyway?
__________________
Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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04-22-2016, 04:39 PM
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#9
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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From Everett marine and my diesel mechanic. I don't know the reason. Old school is zinc for salt and brackish, magnesium for fresh. Being aluminum rate is 10+ it has to be a high% of magnesium. I am not a believe. Also aluminum has been used instead if zinc in some toxic application.
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04-22-2016, 05:38 PM
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#10
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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I should add that on our Loop boat, once we get it to the TN River or perhaps even on Lake Michigan, we will switch to Magnesium since it will remain in fresh water a couple of years.
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04-22-2016, 05:48 PM
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#11
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Guru
City: Pender Harbour, BC
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,791
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I have 14 aluminum anodes on my boat and 2 left-over zincs. I am on the hard now and all except the two zincs were changed. The aluminum work great and they last longer, supposed to be cheaper but haven't seen the bill yet.
__________________
Don't believe everything that you think.
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04-22-2016, 08:19 PM
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#12
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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We're in brackish and salt. I'm going all aluminum this year. I found the aluminum anodes to be just about the same price as zinc.
Ken
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04-23-2016, 07:52 AM
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#13
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Guru
City: Under a boat, in a marina in the San Francisco Bay
Join Date: Mar 2012
Posts: 615
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Quote:
Originally Posted by CPseudonym
Whatever happened to fstbttms anyway?
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__________________
Clean bottoms are FastBottoms!
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04-27-2016, 12:32 AM
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#14
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Guru
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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Glad to see you are still here FastBottoms.
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04-27-2016, 06:30 AM
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#15
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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There he is. Howdy FB
__________________
Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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04-27-2016, 07:01 AM
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#16
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Guru
City: Under a boat, in a marina in the San Francisco Bay
Join Date: Mar 2012
Posts: 615
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You can't get rid of me that easily.
__________________
Clean bottoms are FastBottoms!
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04-27-2016, 07:10 AM
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#17
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,565
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Greetings,
Mr. fst. I don't think anyone was trying to get rid of you. Just wondering when you would come up for air...
__________________
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