The best high holding power anchor yet?

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Mark
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Re: The best high holding power anchor yet?

Postby Mark » Thu May 24, 2012 10:26 pm

mm5aho wrote:While it is "pickling" in acid, some H2 is formed.

It is possible to "clean" the steel by blast cleaning, but the reprofiling that often results alters the coating characteristics. Sometimes positively, sometimes adversely depending on the other factors involved.
It could be that the anchors is galvanized that way.


So, just so I can get this into my head, the hydrogen comes from the hydrochloric acid and the way to avoid the problem would be to use blast cleaning not chemical.

ubergeekian
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Re: The best high holding power anchor yet?

Postby ubergeekian » Fri May 25, 2012 3:46 pm

mm5aho wrote:Now to the hydrogen embrittlement:
To get the steel clean it is immersed in hydrochloric acid. (usually preceeded by a degreaser which is alkaline), and remains in HCl for from 30 mins to sometimes 3 hours, depending on rustiness.
While it is "pickling" in acid, some H2 is formed.


All is now clear. Many thanks.

PS Are you "the" Geoff? The one who ought to know a lot about galvanizing?
Never attribute to malice that which is adequately explained by stupidity - Hanlon's Razor
But don't rule out malice - First Corollary to Hanlon's Razor

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mm5aho
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Re: The best high holding power anchor yet?

Postby mm5aho » Fri May 25, 2012 4:22 pm

"The" Geoff sounds ominous.
But yes I know about galvanizing, steelmaking, silicon smelting, alumina refining and suchlike.
and a little about yachts, sailing, and electronics.

If you need galvanizing or powdercoating be in contact for those jobs that no-one normally wants to do, but yachties get "mates rates".

Now, off to the boat for the weekend, enough of this desk!
Geoff.
"Contender" Rival 32: Roseneath in winter, Mooring off Gourock in summer.


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