zincs

[jim rosenthal]

Well, folks, change your engine zincs before they fall apart and you have to take the HE apart to get all the fragments out. Ask me how I know. If this post helps ONE Hatteras owner avoid the current unpleasantness, the embarrassment will be well worth it. What a pain this is.

 

[Canuck Dennis]

Have briefly scanned a report here in the PNW, commercial vessels, that aluminum is better than zinc and less expensive, also some marinas are banning zinc due to enviro. concerns. The big caution is to be sure it's aluminum not a combination of crap coming from ?????

 

[TROUBLE]

do 8-53 naturals have engine zincs and if so where are they

Art

 

[Boatnut]

Have briefly scanned a report here in the PNW, commercial vessels, that aluminum is better than zinc and less expensive, also some marinas are banning zinc due to enviro. concerns. The big caution is to be sure it's aluminum not a combination of crap coming from ?????

Do they explain the reason aluminum is better? As for cheaper, the difference between zinc and aluminum is negligible. It would be nice to she the article if possible.

 

[Canuck Dennis]

Will hopefully have the rest of the info in a day or so and will extract and post what I can.

 

[bostonhatteras]

do 8-53 naturals have engine zincs and if so where are they

Art

Look to the areas where raw water is present. Around the raw water pump and the heat exchangers. The heat exchangers will have flanges with pipes leading in and out. That is where they are. They will look like brass pipe plugs on the outside.

 

[saltshaker]

Do they explain the reason aluminum is better? As for cheaper, the difference between zinc and aluminum is negligible. It would be nice to she the article if possible.

I'd like to see that too. Zinc is lower in nobility than aluminum, particularly if the anodes aren't pure aluminum. I don't know how much of a savings there would be but if the aluminum anodes could offer the same protection and last longer, that would certainly be a benefit. Aluminum is pretty low on the nobility scale. I might consider it for my running gear but I'd be reluctant for the engines. Anyone have a source for pure aluminum alloy anodes?

 

[Robby]

We just went thru this and we did have to remove the HEs end caps to get some crap out.Found part of a Impeller in the no 1 Engine.

 

[Plan B2]

Would anyone happen to have a list of zincs for 8V71TIs? Part numbers or descritions to order by.
Best source for ordering on line?
Sam's?

 

[fissioneng]

Do they explain the reason aluminum is better? As for cheaper, the difference between zinc and aluminum is negligible. It would be nice to she the article if possible.

There's an article in Passagemaker about this.

http://www.passagemaker.com/subscriptions/channels-e-newsletter/item/1485-galvanic-isolators-and-

 

[rsmith]

Anodes aluminum?, shafts stainless? dissimilar metal corrosion? What are these guys smokin?

Farewell and adieu to you, Spanish Ladies,
Farewell and adieu to you, ladies of Spain;
For we've received orders for to sail for old England
And we may never see you fair ladies again

 

[saltshaker]

Anodes aluminum?, shafts stainless? dissimilar metal corrosion? What are these guys smokin?

No different than zinc, just a different metal with different nobility. I think zinc is safer as it is lower in nobility but not so much to be an issue. Aluminum may actually be better on stainless but I don't know enough about the difference in nobility to know if that is true. It's my understanding that using an anode that's too far off in nobility than the metal you are protecting can be a bad thing. But again my understanding of this is not that deep to make a determination. For that reason I've stuck with zinc but this isn't the first time I've heard about aluminum anodes becoming more popular. A good scientific article from a reliable source would be of interest.

 

[rsmith]

No different than zinc, just a different metal with different nobility. I think zinc is safer as it is lower in nobility but not so much to be an issue. Aluminum may actually be better on stainless but I don't know enough about the difference in nobility to know if that is true. It's my understanding that using an anode that's too far off in nobility than the metal you are protecting can be a bad thing. But again my understanding of this is not that deep to make a determination. For that reason I've stuck with zinc but this isn't the first time I've heard about aluminum anodes becoming more popular. A good scientific article from a reliable source would be of interest.

Uh huh sure! Pull a stainless bolt out of an aluminum tower leg after a few years and it looks like a toothpick in the middle. Science theory is great untill it gets in the real world.

 

[fissioneng]

Uh huh sure! Pull a stainless bolt out of an aluminum tower leg after a few years and it looks like a toothpick in the middle. Science theory is great untill it gets in the real world.

That is due to the stainless becoming active which usually doesn't happen underwater.

Check out Calder's book on the subject.

Zinc is -.98 to -1.03 potential, Aluminum is -.76 to -1.00, so they are pretty close.

 

[Canuck Dennis]

Pretty well what the article up here said, will take some time for the sources of supply to catch up.