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Old 03-07-2008, 01:49 AM   #1
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Default green corrosion on bronze/brass seacocks

what is the best chemical or way to clean the green corrosion off of bronze seacocks and valves ? tried spraying them with salt away but it didn't remove any of the green corrosion. once removed does anyone spray these components with corrosion x or some other chemical to prevent more corrosion?
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Old 03-07-2008, 02:32 AM   #2
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Default Re: green corrosion on bronze/brass seacocks

The green stuff is copper sulphate. Use a metal polish formulated for brass on a soft damp cloth then polish off with a clean soft cloth. They can be sealed with various clear products but if you have to clean em now & again at least you will be able to check their condition. Plus the sealer will need to be redone.
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Old 03-07-2008, 03:35 AM   #3
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Default Re: green corrosion on bronze/brass seacocks

On reflection, it is probably copper acetate but the fix remains the same.
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Old 03-07-2008, 04:00 AM   #4
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Default Re: green corrosion on bronze/brass seacocks

Peter,
Does the copper sulfate appear on bronze as well as copper products when exposed to salt.
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Old 03-07-2008, 04:18 AM   #5
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Default Re: green corrosion on bronze/brass seacocks

It's romantically called "verdigris" and doesn't cause any particular harm. If you want to minimize your efforts, just use a small stiff stainless steel wire brush on it.
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Old 03-07-2008, 04:32 AM   #6
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Default Re: green corrosion on bronze/brass seacocks

You can rub bronze valves with vasaline and the green will not come back.
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Old 03-07-2008, 12:58 PM   #7
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Default Re: green corrosion on bronze/brass seacocks

Quote:
skiphughes - 3/7/2008 6:00 PMPeter,Does the copper sulfate appear on bronze as well as copper products when exposed to salt.
Bronze is an alloy of copper & tin plus a few extras & is suitable for marine use. Brass is an alloy of copper & zinc with additives. Both are susceptible to tarnishing. It is only cosmetic.
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Old 03-07-2008, 01:18 PM   #8
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Default Re: green corrosion on bronze/brass seacocks

In fact the green stuff is a natural protective barrier, if you don't mind the cosmetic apperaance.
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Old 03-08-2008, 08:26 AM   #9
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Default Re: green corrosion on bronze/brass seacocks

Quote:
MarkV_Deep6 - 3/7/2008 4:18 PM

In fact the green stuff is a natural protective barrier, if you don't mind the cosmetic apperaance.
And there is the answer.
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