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Old 19-03-2014, 18:46   #1
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Way too much corrosion.. help

My boat sits in brackish water. I have a constant problem with major corrosion in the bilge and on the engine parts. Just this last summer I put in two new carbs, two new fuel pumps, and already they are both covered with this white, powdery corrosion. What can I do to stop this?

A couple of pictures attached. It seems everything in the bilge gets a coat of rust or white powder on it quickly.
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Old 19-03-2014, 18:59   #2
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Re: Way too much corrosion.. help

You have a bad case of galvanic corrosion. The major things to check...

1) if the boat is on shore power you probably need an isolator
2) is the boat bonded? To what
3) state of the anodes. Remember in brackish water you need aluminium not zinc, you might also want to look at going to magnesium (fresh water) to help control the issue.
4) dissimilar metal contact. I doubt this is a problem because the corrosion is so rapid.
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Old 09-02-2022, 22:57   #3
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Re: Way too much corrosion.. help

Steel boat?. It will probably eat through the hull.
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Old 09-02-2022, 23:47   #4
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Re: Way too much corrosion.. help

The way to stop corrosion on unpainted engine metal parts in the pics is clean them, oil free, and buy Varathane in a spray can. It's plastic and last a long time. Best done when the parts are new.
In the navy, the guys got tired of daily shining all the brass every day, so polished it one last time, wiped down with acetone, and sprayed it. Lasted forever. Nobody knew except the former polishers and me.
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Old 10-02-2022, 01:03   #5
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Re: Way too much corrosion.. help

There's a reason some things are called "Marine rated" Sometimes it more than just a reason to jack the price up.
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Old 10-02-2022, 01:48   #6
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Re: Way too much corrosion.. help

Quote:
Originally Posted by Stumble View Post
You have a bad case of galvanic corrosion. The major things to check...

1) if the boat is on shore power you probably need an isolator
2) is the boat bonded? To what
3) state of the anodes. Remember in brackish water you need aluminium not zinc, you might also want to look at going to magnesium (fresh water) to help control the issue.
4) dissimilar metal contact. I doubt this is a problem because the corrosion is so rapid.
Excellent post, Stumble!

@juryduty - That was an exorbidant amount of parts to go through! You need to see which anodes will effectively "rot" first, rather than your expensive boat components.

Good luck!
(And fair winds)
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Old 10-02-2022, 02:46   #7
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Re: Way too much corrosion.. help

Quote:
Originally Posted by Stumble View Post
You have a bad case of galvanic corrosion.

4) dissimilar metal contact. I doubt this is a problem because the corrosion is so rapid.
Galvanic corrosion is caused by "dissimilar metal contact."
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Old 10-02-2022, 03:11   #8
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Re: Way too much corrosion.. help

Is it possible that you are getting some salt water in your engine space? Galvanic corrosion does not happen between dissimilar metals without an electrolyte present. Wouldn't expect to see it in a dry engine space.
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Old 10-02-2022, 03:32   #9
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Re: Way too much corrosion.. help

Hopefully he has tried one of the suggestions by now since it's been almost 8 years since he posted his question/problem.
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Old 10-02-2022, 03:35   #10
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Re: Way too much corrosion.. help

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Hopefully he has tried one of the suggestions by now since it's been almost 8 years since he posted his question/problem.

Ha, I thought it was a new thread today.
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