• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Zinc, alumium, or magnesium anodes?

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Zinc, alumium, or magnesium anodes?

    I a'm confused on what type of anode to purchase. My houseboat is kept in fresh water and has twin Volvo Penta AQ200/280. I have another anode from other houseboat of mine and it seems very heavy for its size (zinc?) compared with a larger aluminum one that I have. I imagine that magnesium also is very light. Does it realy mater if A zinc or aluminum anode is used. After all the unit is kept in fresh water? Thanks.


  • #2
    Re: Zinc, alumium, or magnesium anodes?

    General rule of thumb is magnesium for fresh, zinc for salt. Sacrificial anodes are made up of a cocktail of alloy, the best people to advise you as to the exact type you need is the outdrive manufacturer.

    There should be a direct correlation between the size of the anode and the material that needs protection.

    For example, my boat has a pair of 45ft alloy toons. I have a 10 pound magnesium anode attached to each pontoon.
    Watch this space......................

    Comment



    • #3
      Re: Zinc, alumium, or magnesium anodes?

      Thank you for the reply.
      I found the mfgr.of one of the anodes and it is zinc. So I guess someone put the wrong type on. I guess I'll have to wait for a couple more weeks untill the covers come off to check to see what type of material the second dog bone type is made of so I don't mix zinc/magnesium or what ever. Thanks again.

      Comment



      • #4
        Re: Zinc, alumium, or magnesium anodes?

        Went to a houseboat show a couple weeks back and talked to some vendors about anodes. Seems aluminum is the best thing to get for a boat in fresh water. I was kinda curious how an aluminum anode would do any good on a house boat that is made of aluminum and he said the anodes are much softer than the hull of the boat so electrolysis sets up in the anodes before the hull, etc.
        1990 Stardust
        -Dual Chevy 305's with Volvo DP's

        Comment



        • #5
          Re: Zinc, alumium, or magnesium anodes?



          O.K., I'm not mechanical, so I will ask. What is an anode, and what does it do ??

          ~~ This boat runs on gas, NOT thanks ~~

          Comment



          • #6
            Re: Zinc, alumium, or magnesium anodes?

            I've always been told Magnesium is best for fresh water.
            Aluminum was for brackish and zinc for salt.

            Comment



            • #7
              Re: Zinc, alumium, or magnesium anodes?

              204,

              An anode is a alloy that will sacrifice itself in place of the surrounding alloys (such as outdrive legs, props, toons etc etc).

              A sacrificial anode must be towards the bottom (or at the bottom ) of the 'Nobility Table'.

              I am currently blocked from posting pictures but someone (hopefully!) will post a copy of the 'Nobility Table' to clarify what I am talking about.
              Watch this space......................

              Comment



              • #8
                Re: Zinc, alumium, or magnesium anodes?

                http://www.pelaginox.com/data/d-galvanic.html

                Comment



                • #9
                  Re: Zinc, alumium, or magnesium anodes?

                  Thanks daddy.
                  Watch this space......................

                  Comment



                  • #10
                    Re: Zinc, alumium, or magnesium anodes?

                    Thank you Super Daddy! Great site for a super explanation of both salt and fresh water applications plus other components affected also.

                    Comment


                    Working...
                    X