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  #21  
Old 03-07-2014
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Re: Zincs

Quote:
Originally Posted by Minnewaska View Post
No way. I hate marelon.

While I get the science on galvanic corrosion, I'm just trying to get my head around why I just don't see much of it on unbonded thru hulls. Some, for sure.

Ours are unbonded and have a stainless steel ball inside a bronze case. Add salt water and they should disappear. But they haven't. Maybe the potential between the two is small? That can't be it. There is some thing preventing disintegration. I'm curious.
You are correct, there is not much voltage difference between bronze and stainless (depending on grades). If you google galvanic scale you will get a list of metals showing the voltage potentials of many different metals. The further they are apart on that scale, the more likely corrosion.

The low difference between bronze/stainless does not mean there is no corrosion it just means that the process is extremely slow and may not be evident to the naked eye for decades or more.
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  #22  
Old 03-07-2014
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Re: Zincs

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Originally Posted by boatpoker View Post
Do not buy off brand anodes. Anodes from China can do more harm than good. Take a look at the Martyr website for more info.
Where do you think Martyr anodes are made?
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Re: Zincs

Canada.
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Old 03-07-2014
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Re: Zincs

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They are made in Canada.
No, they used to be made in Canada.
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Re: Zincs

If you want high-quality, North American-made mil-spec anodes, stick with Reliance or Sea Shield.
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Old 03-07-2014
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Re: Zincs

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Originally Posted by Fstbttms View Post
No, they used to be made in Canada.
Thanks for the heads up, I had to go check that out. Apparently Martyr started shifting work to China when Canada Metals and Rocna became part of the group. Martyr says they still make some in Canada but I couldn't get a percentage. They claim they keep tight control on quality and that it is as high as ever. I guess if Apple can control I-pad quality in China, Martyr can too but given the Groco Chinese debacle and other cases of Chinese anodes eating themselves due to impurities I'll be a tiny bit skeptical for a while.

I agree buying from someone who produces to mil spec is the way to go. The caution on off-brands or no-brands is still applicable.
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Re: Zincs

All I can say is I don't remember the last time I saw a Martyr anode that was marked, "Made in Canada." There may be a percentage that still are, but that percentage doesn't seem to include anodes made for the recreational boating market. In any event, I don't use 'em.
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Re: Zincs

Curious if following correct
Should have some of zinc gone when checked at hauling or dive
Zincs should disappear at roughly same rate. If one nearly totally gone and other pristine check grounding or current leak inside boat
If no degrading of zincs check if continuty preserved. If zinc being lost at "normal" rate continuity probably ok.
replace zincs if more than 1/4 seems gone. more is really gone than apparent sometimes.
Zinc disappear quicker in marinas due to stray current in water
Would appreciate input from more knowledgeable folks. I replace all zincs when boat is hauled figuring they are cheap enough.
What web sources for zincs give good quality at fair price?
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Re: Zincs

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Originally Posted by Fstbttms View Post
All I can say is I don't remember the last time I saw a Martyr anode that was marked, "Made in Canada." There may be a percentage that still are, but that percentage doesn't seem to include anodes made for the recreational boating market. In any event, I don't use 'em.
After I talked to Martyr I walked around the corner to the local chandlery. Every anode they had on the shelf was a Martyr. Not one of the zinc. aluminum or magnesium anodes had any "made in ...... " I.D.
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Re: Zincs

I see the boxes they're shipped in all the time. They all say, "Made in China." I suspect the folks at Martyr are not anxious to broadcast that information.
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