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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 shroud corrosion		  New Topic  Topic Locked
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Initially Posted - 03/04/2004 :  22:07:22  Show Profile  Visit Frank Hopper's Homepage
I am changing out all of my standing rigging except the backstay this week. I have peeled the white vinyl tubing off of the shrouds and there is considerable green powdery stuff in the wire. Is this SS corrosion? Are these shroud covers a bad idea?
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 03/04/2004 :  23:18:42  Show Profile
Likely it's interaction of some of the copper alloy component in the stainless steel with salt.

I don't believe I've ever seen shrouds with a vinyl coating. Continual 'renewal' of stainless alloy by exposure to oxygen is part of how stainless steel 'works' and stays bright.

IMHO vinyl shroud covers are a bad idea.
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 03/05/2004 :  01:06:15  Show Profile  Visit Douglas's Homepage
More likely its algie (spelling). Old dried crud. The white vynil covers people put on the shrouds tend to promote the groth of this stuff. In addition you should not wrap your turnbarrels with riggers tape. It only promotes corrotion .
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 03/05/2004 :  09:26:14  Show Profile
My surveyer and my rigger both recommended removing the plastic shroud covers when I bought Passage. The crud that gets in there might be sooty, salty, (certainly in this area) and somewhat acidic. The covers retard drying, and therefore promote whatever bad influence those polutants might have on the wire.
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 03/06/2004 :  09:46:37  Show Profile
In order for stainless to maintain its non corrosive properties, it must be freely exposed to air. Covering stainless steel will allow it to corrode in places hidden from view and invites failure.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 03/06/2004 :  10:54:44  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Douglas</i>
<br />More likely its algie (spelling). Old dried crud. The white vynil covers people put on the shrouds tend to promote the groth of this stuff. In addition you should not wrap your turnbarrels with riggers tape. It only promotes corrotion .
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Doug, I believe this post has the record for spelling errors per word; I want some of what your having!
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.