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Old 25-01-2018, 12:32   #1
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Poultice or galvanic corrosion?

Got a maintenance project that needs an answer to this question:

If I put a stainless steel screw into an aluminum mast, is the resulting corrosion poultice or galvanic? And why?

Thanks
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Old 28-01-2018, 03:52   #2
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Re: Poultice or galvanic corrosion?

Galvanic - two dissimilar metals in electric contact plus an electrolyte (any dampness/spray etc)

Poultice would be if it was say a void that crud could collect in, holding water in contact with the metal, plus the chemical action possible depending on the nature of the crud... a bit similar to crevice corrosion
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Old 28-01-2018, 05:23   #3
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Re: Poultice or galvanic corrosion?

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Originally Posted by mickt243 View Post
Galvanic - two dissimilar metals in electric contact plus an electrolyte (any dampness/spray etc)

Poultice would be if it was say a void that crud could collect in, holding water in contact with the metal, plus the chemical action possible depending on the nature of the crud... a bit similar to crevice corrosion
Correct.... end of thread
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Old 28-01-2018, 05:27   #4
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Re: Poultice or galvanic corrosion?

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Correct.... end of thread
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Old 28-01-2018, 06:03   #5
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Re: Poultice or galvanic corrosion?

Well actually, what often happens is galvanic corrosion starts and then creates an environment where poultice corrosion continues. Initial galvanic corrosion will blister the paint, then poultice corrosion takes over and spreads laterally with moisture trapped under the paint with no oxygen.
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Old 29-01-2018, 06:40   #6
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Re: Poultice or galvanic corrosion?

...just use duralac!
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Old 29-01-2018, 13:10   #7
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Re: Poultice or galvanic corrosion?

Or, the silver anti-seize, it works well. Lately, we've been using lanolin for it, with acceptable results, much to my surprise.

Ann
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