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  #1  
Old 3 Weeks Ago
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First polyester mites, now chain mites?

Cleaning our good old USA manufactured chain yesterday, I noticed this pitting. This chain is less than a year old, the galvanizing is almost nearly gone and now this.
Have any of you seen anything like this on chain before? Could this be casting flaws, little bits of impurities in the manufacturing process? It looks like nothing so much as little holes left by small bugs; chain mites.
I forgot to mention that this chain is being used daily as my anchor chain.
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  #2  
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Re: First polyester mites, now chain mites?

Do you have an electric windlass, how are the ground connections on it? That's some impressive pitting corrosion.
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Re: First polyester mites, now chain mites?

The quality of chain today is not what it used to be, but that's really bad for only a year. I've been pretty happy with Acco mooring chain, but still only get 2 or 3 years out of my upper chain.
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Re: First polyester mites, now chain mites?

Quote:
Originally Posted by Don0190 View Post
Do you have an electric windlass, how are the ground connections on it? That's some impressive pitting corrosion.
I agree with Don. That certainly looks like erosion due to electrolysis. Our anchor chain is 12+ years old and other than some wear, there is no erosion whatsoever. From those photo's I'd guess that windlass is "hot".

FWIW...
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Re: First polyester mites, now chain mites?

Interesting that the chain is black. Those pits are identical in appearance to those often found in the bottom of large oil tanks that have been storing high heavy oils. They can form in 2 years if...

Electrolysis is present or if there is some chemistry that causes a differential (layers in the tank bottom sludge) in oxygen concentration. Have you been anchoring in some manner of smelly mud? Have you been anchoring in the same spot for extended periods?

How do your shaft zincs look? If they are fine, electrolysis seems less probable. If they are shot....
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Re: First polyester mites, now chain mites?

Interesting that the chain is black. Those pits and the coloration are identical in appearance to those often found in the bottom of large oil tanks that have been storing heavy oils (I do corrosion studies as part of my day job). They can form in 1-2 years if...

Electrolysis is present or if there is some chemistry that causes a differential (layers in the tank bottom sludge) in oxygen concentration. Have you been anchoring in some manner of smelly mud? Have you been anchoring in the same spot for extended periods?

How do your shaft zincs look? If they are fine, electrolysis seems less probable. If they are shot....
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Re: First polyester mites, now chain mites?

Quote:
Originally Posted by pdqaltair View Post
Interesting that the chain is black. Those pits are identical in appearance to those often found in the bottom of large oil tanks that have been storing high heavy oils. They can form in 2 years if...
Electrolysis is present or if there is some chemistry that causes a differential (layers in the tank bottom sludge) in oxygen concentration. Have you been anchoring in some manner of smelly mud? Have you been anchoring in the same spot for extended periods?
How do your shaft zincs look? If they are fine, electrolysis seems less probable. If they are shot....
Unfortunately, the zincs are also a year old and in need of replacement just on general usage. We've been anchored in Prickly Bay, Grenada for a couple of months and have not had this problem in the two previous years here, with different chain. The way it is so hit and miss along the chain, but mostly concentrated on one side of the links affected, would push my thoughts more toward casting flaws; one would think electrolysis would be more of an equal opportunity metal muncher?
As you may have noticed, the galvanizing is long gone as well, worn right off.
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Re: First polyester mites, now chain mites?

Quote:
Originally Posted by capta View Post
Unfortunately, the zincs are also a year old and in need of replacement just on general usage. We've been anchored in Prickly Bay, Grenada for a couple of months and have not had this problem in the two previous years here, with different chain. The way it is so hit and miss along the chain, but mostly concentrated on one side of the links affected, would push my thoughts more toward casting flaws; one would think electrolysis would be more of an equal opportunity metal muncher?
As you may have noticed, the galvanizing is long gone as well, worn right off.
Not casting flaws; wire is drawn, not cast. However, the bending/forming of the wire causes stress and the stress accelerates corrosion.

Brand and grade? The corrosion pattern to me suggests low temper, but I'm guessing.

Were parts buried and parts exposed? Patches of grass (I'm not clear on what you mean by hit-or-miss)?

Judging from the black color, I wouldn't blame the chain; there is something else going here.
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Re: First polyester mites, now chain mites?

It'll buff out
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Re: First polyester mites, now chain mites?

did you paint or apply any coating on the chain?
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