Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 20-06-2024, 01:58   #1
Registered User

Join Date: Apr 2024
Boat: Starkel 56
Posts: 58
How to clean corroded Through-hulls ?

Hi guys my boat has corroded through-hulls made of Brass, the corrosion is mainly of white and green colour and I haven't seen pink yet (dezincification) so even though they look terrible, I'm not panicking yet.

How do I go about cleaning the cosmetic corrosion? I've heard many people say water and vinegar / baking soda / lime.. but I'm not really sure about it.

Thanks
Attached Thumbnails
Click image for larger version

Name:	IMG_3447.jpg
Views:	115
Size:	429.2 KB
ID:	291140   Click image for larger version

Name:	IMG_3443.jpg
Views:	97
Size:	420.8 KB
ID:	291141  

AleCiotti is offline   Reply With Quote
Old 20-06-2024, 02:02   #2
Registered User

Join Date: Apr 2024
Boat: Starkel 56
Posts: 58
Re: How to clean corroded Through-hulls ?

I will be changing most-all the trough hulls with non-metallic (trudesign) ones in less than a month.
AleCiotti is offline   Reply With Quote
Old 20-06-2024, 04:12   #3
Registered User
 
Orion Jim's Avatar

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 3,213
Images: 8
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by AleCiotti View Post
I will be changing most-all the trough hulls with non-metallic (trudesign) ones in less than a month.
Less than a monthÖIíd avert my eyes till the replacements are installed.
Orion Jim is offline   Reply With Quote
Old 20-06-2024, 04:46   #4
Registered User

Join Date: Jul 2020
Location: Virginia, USA
Boat: Hunter 340
Posts: 1,280
Re: How to clean corroded Through-hulls ?

If they can be opened and closed and you are replacing them soon I wouldn't do anything until you replace them.
Statistical is offline   Reply With Quote
Old 20-06-2024, 04:49   #5
Registered User

Join Date: Jun 2019
Location: La Spezia
Boat: Grand Soleil 42
Posts: 58
Re: How to clean corroded Through-hulls ?

Ok, but what if OP had said a year.
Following...
paul.devalier is offline   Reply With Quote
Old 20-06-2024, 05:00   #6
Registered User

Join Date: Jul 2020
Location: Virginia, USA
Boat: Hunter 340
Posts: 1,280
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by paul.devalier View Post
Ok, but what if OP had said a year.
Following...
The best way would be to remove the seacocks (OP said thruhull but photos are of seacocks) when on the hard, use a brush to remove as much surface corrosion as possible and then put them in a bucket of vinegar diluted to 50/50 for a couple hours (or overnight). Rinse thoroughly. Reinstall.

If you can't or won't do that then ketchup works. It has vinegar and the consistency means you can paint it on, wait and then wipe it off.
Statistical is offline   Reply With Quote
Old 20-06-2024, 06:03   #7
Registered User

Join Date: May 2008
Posts: 3,639
Re: How to clean corroded Through-hulls ?

I’d be much more worried about that hose and especially the rusted hose clamps.

I can’t tell from the picture but is one hose clamps cutting into the hose cover and the other not clamping on the seacock nipple?

If the hose clamp is cutting into the hose replace the hose now.

Also put on two new hose clamps (AWAB or other high quality 316 stainless brand). Make sure they are both clamping on the seacock nipple, not falling off the end. Clamps should be at least a clamp width back from the end of the nipple.

The hose should not have any bulges that would indicate the layers are delaminating.

When you are replacing the seacocks replace any below the waterline hose that is more than 10 years old.

Failed hoses and clamps sink many more boats than failed seacocks.
CarlF is offline   Reply With Quote
Old 20-06-2024, 08:02   #8
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 9,793
Re: How to clean corroded Through-hulls ?

Avert your eyes, don't go far, and find something else to fix. Given that situation, there are other important projects. You'll be replacing the fittings, hoses, and clamps in a month.


All kidding aside, anything that will remove heavy corrosion risks slight weakening.


But just sayin' you need a weak acid, and CLR is probably one of the best products for this. Vinegar is too slow. A small wire brush too. But you are replacing them, so leave them alone.
__________________
Gear Testing--Engineering--Sailing
https://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 20-06-2024, 08:02   #9
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 9,793
Re: How to clean corroded Through-hulls ?

Avert your eyes, don't go far, and find something else to fix. Given that situation, there are other important projects. You'll be replacing the fittings, hoses, and clamps in a month.


All kidding aside, anything that will remove heavy corrosion risks slight weakening.


But just sayin' you need a weak acid, and CLR is probably one of the best products for this. Vinegar is too slow. A small wire brush too. But you are replacing them, so leave them alone. They might start leaking.
__________________
Gear Testing--Engineering--Sailing
https://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 20-06-2024, 11:38   #10
Registered User
 
Orion Jim's Avatar

Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 3,213
Images: 8
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by paul.devalier View Post
Ok, but what if OP had said a year.
Following...
Then the wise man would remove and replace ASAP.
Orion Jim is offline   Reply With Quote
Old 21-06-2024, 03:25   #11
Registered User

Join Date: Apr 2024
Boat: Starkel 56
Posts: 58
Re: How to clean corroded Through-hulls ?

Thank everyone for the replies, sorry for the error, I'm Italian (I though seacoccks and trough-hulls meant the same thing), if it was for me I wouldn't touch that corrosion but my boat will have a safety inspection in about 2 weeks, and I can't replace the seacocks until 1 month so I need to do the best I can to make them better right now.
if I don't pass the inspection I can't go to the shipyard and I will not be able to change them =(.

A bit of a strange situation I know, but I need to do the best I can to get the boat safe.
AleCiotti is offline   Reply With Quote
Old 21-06-2024, 03:31   #12
Registered User

Join Date: Apr 2024
Boat: Starkel 56
Posts: 58
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by CarlF View Post
Iíd be much more worried about that hose and especially the rusted hose clamps.

I canít tell from the picture but is one hose clamps cutting into the hose cover and the other not clamping on the seacock nipple?

If the hose clamp is cutting into the hose replace the hose now.

Also put on two new hose clamps (AWAB or other high quality 316 stainless brand). Make sure they are both clamping on the seacock nipple, not falling off the end. Clamps should be at least a clamp width back from the end of the nipple.

The hose should not have any bulges that would indicate the layers are delaminating.

When you are replacing the seacocks replace any below the waterline hose that is more than 10 years old.

Failed hoses and clamps sink many more boats than failed seacocks.
Thanks for the advice,

If the clamp is cutting into the hose due to corrosion, can I take it off, cut the damaged part of the hose and put it back on with a new Hose clamp? or do you recommend to change the whole hose? ( if you say to change any 10+ yrs old hose than I will probably have to replace all of them when I do the trough hulls so it doesen't really matter )
AleCiotti is offline   Reply With Quote
Old 21-06-2024, 03:58   #13
Registered User

Join Date: Jul 2020
Location: Virginia, USA
Boat: Hunter 340
Posts: 1,280
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by AleCiotti View Post
if I don't pass the inspection I can't go to the shipyard and I will not be able to change them =(.
Wait what? That is insane.

What if you had something genuinely unsafe but which can only be fixed on the hard like say torn packing box hose. Your only option is to let the boat sink instead of taking it where you can make it safe?
Statistical is offline   Reply With Quote
Old 21-06-2024, 05:01   #14
Marine Service Provider

Join Date: Jun 2015
Location: Croatia
Boat: Elan 45 impression
Posts: 1,343
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by Statistical View Post
Wait what? That is insane.

What if you had something genuinely unsafe but which can only be fixed on the hard like say torn packing box hose. Your only option is to let the boat sink instead of taking it where you can make it safe?
simply no inspections no insurance,no insurance no shipyard end story.
inspection goverment bob
insurance private john company
shipyard private jenny company
bob don't know john,jenny and don't car who is john or jenny. for bob most important thing in world is what on lunch manu spageti or penne,with carne or tomato
more is offline   Reply With Quote
Old 21-06-2024, 05:04   #15
Registered User

Join Date: Jul 2020
Location: Virginia, USA
Boat: Hunter 340
Posts: 1,280
Re: How to clean corroded Through-hulls ?

Quote:
Originally Posted by more View Post
simply no inspections no insurance,no insurance no shipyard end story.
Oof. Yeah that is a bad catch-22. I have always had insurance (at least liability) never really considered if you lost it and needed to get it back the challenges that could involve.
Statistical is offline   Reply With Quote
Reply

Tags
hull, rode

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cedar strip planked hulls with questionable through hulls and deck fittings workmaster2n Construction, Maintenance & Refit 12 10-10-2023 13:11
The cabin is never clean no mater how much I clean Brent n Aurora Our Community 30 05-11-2019 01:10
phosphoric acid solution to clean alloy hulls hellomister Construction, Maintenance & Refit 13 17-07-2017 00:38
Removing Corroded Seacocks and Thru-Hulls Beersmith Construction, Maintenance & Refit 37 23-05-2011 19:30
Thru-Hulls in Cored Hulls ggray Construction, Maintenance & Refit 7 22-12-2009 08:07

Advertise Here


All times are GMT -7. The time now is 22:43.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.