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Old 15 April 2017, 16:19   #1
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Anodes

Hi there,
just wondering if anybody knows the cheapest source to get zinc anodes for 2002 merc 60hp fourstroke. Found anodesdirect, but out of stock,seems a bit harder to get when they are not top dollar.Any help appreciated.
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Old 15 April 2017, 16:36   #2
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I corrode more anodes than anyone I know and I've spent a lot of time searching for bargains. I'd say beware the cheap stuff and go the extra few quid for the real deal. There's a lot of stuff about that look like anodes but aren't what you really need. I mean - "freshwater anodes", srsly?
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Old 15 April 2017, 16:46   #3
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anodes

Cheers for the reply willks. may I ask where you source your anodes from , that's interesting that the cheaper ones don't do the job , would you say its because they are not actually made of zinc? I toyed with the idea of copying the dimensions and having the local blacksmith knock them up.
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Old 15 April 2017, 17:02   #4
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Quote:
Originally Posted by captain birdseye View Post
Cheers for the reply willks. may I ask where you source your anodes from , that's interesting that the cheaper ones don't do the job , would you say its because they are not actually made of zinc? I toyed with the idea of copying the dimensions and having the local blacksmith knock them up.
I think what I'm saying is that not all anodes are born equal. They aren't the biggest annual cost and yet they have the potential to cost you big money if they fail to be the weakest link. I've seen pukka anodes fail to work because they were a slightly different composition to the others on the engine. My final position is to run "original part" anodes where there are a number of them working in together to provide protection - i.e. on an OBM.
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Old 15 April 2017, 17:23   #5
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You also need to check your installation for current leakage. Proper isolation is crucial
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Old 16 April 2017, 10:35   #6
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I have bought chunks of zinc anode from Ebay. One of the bits had part of MG Duff cast in it so unless the seller was being very clever, it was probably of reasonable quality.

I then cut it in to the required shape - which was hard work with a hacksaw. This is probably alright with rectangular shapes but less so with complicated shapes.

Freshwater anodes - these tend to be magnesium as they are as they are about as anodic as you can get but don't fur up like zinc anodes in fresh water. You could use magnesium anodes in salt water but they would almost fizz away in front of your eyes.

Interestingly (possibly), we have just asked MG Duff to specify some anodes for a seagoing steel ship and they have specified aluminium anodes. When I questioned this, they said they were shifting all their commercial customers towards aluminium anodes rather than zinc.

To add to PD's comment, one of the key things is to make sure there is no resistance between the anode and the thing you are trying to protect (before the boat is in the water). Sorry to go off topic.
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Old 16 April 2017, 19:10   #7
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Don't forget to cheack the powerhead anodes, theses are often small and on the back of stainless bolts in the powerhead. Being small and constantly part of the saltwater cooling system they need changing more often, something many home service handymen forget.
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Old 17 April 2017, 04:43   #8
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.......Interestingly (possibly), we have just asked MG Duff to specify some anodes for a seagoing steel ship and they have specified aluminium anodes. When I questioned this, they said they were shifting all their commercial customers towards aluminium anodes rather than zinc.


We've been fitting Ally MG Duff anodes to machines destined for saltwater use for some years now, just as effective, cheaper & MUCH lighter & easier to handle. This is to stainless machines for saltwater use. I don't know how the chemistry would work with fitting Ally anodes to Ally outboards though.
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Old 17 April 2017, 05:05   #9
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Quote:
Originally Posted by jonp View Post
Don't forget to cheack the powerhead anodes, theses are often small and on the back of stainless bolts in the powerhead. Being small and constantly part of the saltwater cooling system they need changing more often, something many home service handymen forget.
Yep that's the ones that'll come back to bite you...if you miss em!!
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Old 17 April 2017, 05:51   #10
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I don't know how the chemistry would work with fitting Ally anodes to Ally outboards though.
it won't.
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