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Old 04-02-2007, 04:58   #46
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Quote:
Originally Posted by GordMay
Phosphoric Acid has the unique property of dissolving Iron Oxide (rust) quickly, converting it to Iron Phosphate (a firmly adhering, but thin, protective coating), while etching iron very slowly.
It's a simple, cheap, short-term solution. I "parkerized" my mild steel anchors and rodes annually.
Thank you Gord,
Sounds good. I would like to ask one more question if I may.

Is this a liquid or a crystalline powder (like oxalic acid, boric acid etc) and where do you find it? Would you expect a hardware shop to have it?

What other uses does it have?
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Old 04-02-2007, 05:17   #47
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Quote:
Originally Posted by cat man do
I was under the impression that S/S shackles are a big no no for anchoring as they snap/break instead of stretcing like mild steel does.

I'm sure Gord has more info than me.

Dave
I have used s/s shackles for years and never had a problem.
In fact last summer I managed to break the hinge part of my CQR and the s/s shackle and s/s swivel held up.

This brings me to anchor swivels which are all in s/s in local chandlers.
It is a long time since I took metallurgy but from experience I can tell you that while I have managed to deform s/s shackles I have never managed to break one.

Maybe I'm trying to convince myself
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Old 04-02-2007, 06:58   #48
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Phosphoric Acid is a clear, colourless, odourless, non-combustible, and hygroscopic crystal - but commercial phosphoric acid comes as a viscous solution in water, which contains 75-85% phosphoric acid (H3PO4), and often other agents (glycol ether, alcohol, zinc, etc).

All acids contribute some hydrogen to the metal structure, hence are NOT for use on Stainless Steel, due to it’s susceptibility to hydrogen embrittlement .

Phosphoric Acid, and products based upon it, should be readily available at a good hardware store.

Some formulated Phosphoric Acid Rust Converters:
Skybryte “Ospho” Ospho
And:
Naval Jelly
DuPont Quick-Prep, a mixture of phosphoric acid and alcohol
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Old 04-02-2007, 07:09   #49
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Quote:
Originally Posted by skipperaris
I have used s/s shackles for years and never had a problem.
In fact last summer I managed to break the hinge part of my CQR and the s/s shackle and s/s swivel held up.

This brings me to anchor swivels which are all in s/s in local chandlers.
It is a long time since I took metallurgy but from experience I can tell you that while I have managed to deform s/s shackles I have never managed to break one.

Maybe I'm trying to convince myself
Fair enough, Not saying you haven't had result's but look at this thread.



Stainless Anchors and Chain



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Old 04-02-2007, 10:52   #50
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Quote:
Originally Posted by cat man do
Fair enough, Not saying you haven't had result's but look at this thread.
Dave
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Old 04-02-2007, 11:55   #51
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When the weather warms up and you start anchoring out more often I bet you'll find all that surface rust wears away.
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Old 04-02-2007, 12:52   #52
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Ospho and several other products with phosphoric acid are readily available in hardware stores. Just look for stuff which removes rust. The label will list phosphoric acid as the main ingredient.

BTW, that shackle picture was horrifying!
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Old 04-02-2007, 15:12   #53
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Quote:
Originally Posted by Auspicious
When the weather warms up and you start anchoring out more often I bet you'll find all that surface rust wears away.
Hmmm... the surface rust was there when the anchor was pulled from the bottom after 6 mos at anchor (in different areas, but it went down each night).

We are looking at another probably 12-18 mos of continuous, anchor in the seabed living (no docks, no moorings, etc...) coming up in March.

I suppose this is why I keep eyeing it with concern.

I'll probably just galvanize the CQR (so I don't have to worry about it over the next 12-18mos at anchor) and end-over the chain so the side with more zinc goes down to the seabed.

Thanks for all the input and help, everyone. Much appreciated.
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Old 04-02-2007, 15:28   #54
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I'm surprised. My ground tackle has been cleanest when I use it regularly.
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Old 04-02-2007, 15:37   #55
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Odd, right? I can't really explain it. We had one really polluted place in Michigan that ate a lot of zinc off (you could see the difference) in 3 days. Other than that, I think the constant motion in the seabed, scraping along the sand particles and rocks simply ground the edges of my flukes away a bit, causing the areas of rust.

Auspicious... are we talking about using your anchor each and every day for 6mos+? It is cleaner when you do that vs having the boat at the dock?

BTW: Very nice boat!
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Old 04-02-2007, 15:55   #56
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Yep -- lots of up and down has always seemed to keep the rust off my gear.

Thanks for the comment on my boat. I love her.
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Old 04-02-2007, 22:51   #57
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Lots of life left in that chain. Useing it will make it stay nicer and help with the self-healing process. A spray or 2 of cold galv will see that run another year easily. Go for the 'crown' (US made) brand spray galv, damn good stuff.

One photo (the same one posted a gizzzilloin times but failed in many differing situations) of a dodgy chinese shackle and people get stressed. Ya just gotta laugh the way this 1 particular shackle is developing into it's own urban myth. I'll put a damn good afternoon of beers up that the failure was built in, not created. There are 1000's of stainless fittings in anchor systems worldwide and all anyone can come up with is 1 photo and a few 'My mate said's'.

Lead will melt out in a galvanising bath real easy. If replaced at the galvanisers make sure they use lead and not zinc, it can make a big differance to performance.
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Old 04-02-2007, 23:58   #58
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Not quite correct Gmac. If you work with SST as an engineer, you understand what it is capable of. Hey it's the main reason why SST rigging has a life of 10yrs, even if it looks shiney and new.
I am also not sure how cold Galv is going to last long in Seans situation. I suspect the issue is hard wear, not Galvanic action. The seabed he is in is hard on gear. I would expect the Cold galv to be gone in one or two nights. Yes it's good stuff, but at the end of the day, it's just Zinc rich paint and poor adhesion at that.
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Old 05-02-2007, 05:38   #59
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Quote:
Originally Posted by Auspicious
Yep -- lots of up and down has always seemed to keep the rust off my gear.

Thanks for the comment on my boat. I love her.
Maybe that's it?? Our anchor has lots of down, not much up.
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Old 05-02-2007, 12:38   #60
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G'day Wheel, Yes I do know SS has limitations but that one photo gets popping up as if it was the on-set of Armageddon. Surely if SS shackles were in fact The Grim Reapers playthings they wouldn't be a very very common item to see in use. Mind you we do still vote for polititions so you could have a good point

The cold galv was to cover those odd bits which don't touch the bottom much. Just help keep things a bit tidier a bit longer.

Was going for a boat today but the Hauraki Gulf looks like the inside of a washing machine, damn.
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