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09-08-2021, 14:27
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#47
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Registered User
Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 10,208
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Re: What kind of corrosion is this?
Quote:
Originally Posted by KPRick
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Granted, read it, about steel filings possibly having gotten on the boom even from someone else's grinding, near his boat. Thus possibly neutralizing the effect of two different metals with Ospho on the steel. Just a thought.
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09-08-2021, 14:43
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#48
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: What kind of corrosion is this?
Quote:
Originally Posted by s/v Jedi
What you think is Awlgrip, I think is aluminum oxide. I would take this path: Ultimate Aluminum Cleaner / Restorer
Also, when it’s clean, protect it. RejeX or the new ceramic coatings.
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Yup, I think you're exactly right Jedi, save for a couple of isolated spots where it looks like there may be a missed spot of (harmless) paint. Fortunately the SS fasteners themselves look to be well insulated from the surrounding aluminum. I watched the instructional video from the Starbrite link you posted and the aluminum oxide on the pontoon boat looks exactly like the majority of what my furler is showing. Already have the cleaner/restorer & polish in the cart. Thanks for the tip!
I also noticed a couple of tiny voids. A bit troubling but perhaps an incentive to try a suitable topcoat (after chemical etching, etc.) as you also suggest.
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09-08-2021, 22:59
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#49
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,956
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Re: What kind of corrosion is this?
Quote:
Originally Posted by Exile
Yup, I think you're exactly right Jedi, save for a couple of isolated spots where it looks like there may be a missed spot of (harmless) paint. Fortunately the SS fasteners themselves look to be well insulated from the surrounding aluminum. I watched the instructional video from the Starbrite link you posted and the aluminum oxide on the pontoon boat looks exactly like the majority of what my furler is showing. Already have the cleaner/restorer & polish in the cart. Thanks for the tip!
I also noticed a couple of tiny voids. A bit troubling but perhaps an incentive to try a suitable topcoat (after chemical etching, etc.) as you also suggest.
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For voids, I recommend filling with the original formula JBWeld (not the quick version or any of the new ones for different materials). It is an epoxy that is fortified with aluminum and UV stable.
__________________
“It’s a trap!” - Admiral Ackbar.
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10-08-2021, 04:04
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#50
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: What kind of corrosion is this?
Quote:
Originally Posted by s/v Jedi
For voids, I recommend filling with the original formula JBWeld (not the quick version or any of the new ones for different materials). It is an epoxy that is fortified with aluminum and UV stable.
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I'll try it!
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10-08-2021, 06:34
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#51
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,956
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Re: What kind of corrosion is this?
Quote:
Originally Posted by Exile
I'll try it!
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As you are working on vertical surfaces, it is challenging because it is thin enough to run and thickening weakens it.
I found the best method is to use masking tape around it, then fill using a toothpick and immediately put masking tape over it by holding it tight and rubbing around the filled void, never over it.
The hope is that the next day after removing the tape you can use a metal file to shape it.
Alternatively you can use the epoxy sticks, which you knead the parts together. After pushing that into a void, you finish it smooth with a wetted finger. It cures in seconds so must be quick.
__________________
“It’s a trap!” - Admiral Ackbar.
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10-08-2021, 06:56
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#52
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: What kind of corrosion is this?
Quote:
Originally Posted by s/v Jedi
As you are working on vertical surfaces, it is challenging because it is thin enough to run and thickening weakens it.
I found the best method is to use masking tape around it, then fill using a toothpick and immediately put masking tape over it by holding it tight and rubbing around the filled void, never over it.
The hope is that the next day after removing the tape you can use a metal file to shape it.
Alternatively you can use the epoxy sticks, which you knead the parts together. After pushing that into a void, you finish it smooth with a wetted finger. It cures in seconds so must be quick.
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The voids are so tiny I figured I'd have to also try and apply around the hole to get whatever I manage to get inside to stay put. I've worked with the epoxy sticks quite a bit but the original (liquid) may work better for getting some down inside the voids. If I go that route I'll try your suggestion using masking tape.
Would you apply the cleaner/restorer first or after-the-fact? JB says their epoxy is acid-resistant, and I'd throughly rinse with fresh water of course.
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10-08-2021, 07:26
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#53
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Registered User
Join Date: Mar 2021
Location: Flagler County, FL, USA, Earth
Boat: Lagoon 380
Posts: 1,500
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Re: What kind of corrosion is this?
No one mentioned Alodine treatment. I've used it on below deck 5052 fuel tanks with decent results. Very easy to apply, once substrate is clean. Just a thin wash, to act as a stabilization layer.
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10-08-2021, 15:21
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#54
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,956
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Re: What kind of corrosion is this?
Quote:
Originally Posted by team karst
No one mentioned Alodine treatment. I've used it on below deck 5052 fuel tanks with decent results. Very easy to apply, once substrate is clean. Just a thin wash, to act as a stabilization layer.
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Yes, it was the preferred method but now supposedly CF (controlled fusion) technology is replacing it. I’ll find out when I get back to Florida as I have the new product and just finished taking all paint off an aluminum engine room vent. It was in really bad shape so kind of a worst case scenario
__________________
“It’s a trap!” - Admiral Ackbar.
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10-08-2021, 15:41
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#55
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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What kind of corrosion is this?
This is most likely pitying due to salt . It’s essentially cosmetic , it won’t affect the material in a substantial manner.
“Pitting, those small holes that form in metal, is a type of corrosion caused by a process called depassivation. Depassivation involves the deterioration of protective coatings around a metal due to contact with a chloride. In the case of aluminum on a boat, the main culprit for pitting is salt water.”
__________________
Interested in smart boat technology, networking and all things tech
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