Embedded Chain plate maint/replacement - Page 17 - SailNet Community
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post #161 of 185 Old 01-31-2014
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Re: Embedded Chain plate maint/replacement

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Originally Posted by chucklesR View Post
The primary reason I went for internal vs external was the cost - electro plated plates are x5 the cost
Not sure what you mean by this. Were you looking at having them chromed? Or did you mean electro POLISHED?

If the latter, it only costs a few bucks - far less than the cost of the new chains being cut & drilled. It's well worth it too as the finish lasts WAY longer.

It also precludes crevice corrosion as there is no surface iron left to give it a path into the metal (as long as the electro surface lasts).

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #162 of 185 Old 02-01-2014
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Re: Embedded Chain plate maint/replacement

Sloop,

Electropolishing only slows down crevice corrosion it doesn't stop it. But it is a significant increase in durability and well worth the extra couple of bucks.

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post #163 of 185 Old 02-01-2014
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Re: Embedded Chain plate maint/replacement

the way my polisher explained it, the process removes all the free iron molecules from the outer surface - to a very thin depth, less than .001".

That leaves the outer surface only the chrome and other alloys that comprise S/S so it does stop the crevice corrosion process until that thin layer eventually wears or weathers through, at which point normal corrosion processes start - the exposed iron molecules being the path in for crevice corrosion.

Getting the e-polishing redone every few years would keep it immune, barring damage.

The chains and floors I had done still looked like new after 7 years.
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post #164 of 185 Old 02-02-2014
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Re: Embedded Chain plate maint/replacement

I had mine mirror polished...thats what they call it down here...its like glass...basically the top coat is melted down by buffing...you lose some thickness but because I had mine oversized to 3/8ths instead if 1/4 Im still way stronger

well see how long they last

even if its only 10 years Ill be happy for sure

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post #165 of 185 Old 02-03-2014
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Re: Embedded Chain plate maint/replacement

Electropolishing is a process where the metal is submerged in an acid and an electric current is run thru the system. This causes the imperfections to be lifted from surface. Basically it is plating in reverse, but because of the way it works it takes high spots down faster than the bulk of the material. By removing the high spots and edges it also reduces the number of crevices that salt crystals can hide in, which reduces the speed with which crevice corrosion can occur.


Sloop,

What you are talking about is called pasivation. Which helps bring the chromium to the surface. Since this is what provided the corrosion protection in stainless, the more surface chromium there is again the slower corrosion occurs.


These processes are complimentary but very different.

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post #166 of 185 Old 02-03-2014 Thread Starter
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Re: Embedded Chain plate maint/replacement

All I know is mine won't be shinny except the tops. My current set aren't either - and they've lasted 27 years.
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Re: Embedded Chain plate maint/replacement

thats how I see it too

cept mine were shiny all around stock...jajaja

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post #168 of 185 Old 02-24-2014 Thread Starter
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Re: Embedded Chain plate maint/replacement

I got two warm days in a row so I made some progress.
Using West 105/205 and 405 as structual filler I laid in filler in the center slot where there used to be an air gap that became a water gap.
Keep in mind that the on old plates which were flat the only portion of the plate that touched the hull was the bottom 1/4 of an inch. What I need to do is build out a 'landing' for the new plates that will fit the curve of the hull and be flat at the plate.
https://lh6.googleusercontent.com/-s...o/P1010092.JPG

This is step one, in progress. Do some fill, then do some seal, then overcoat, and overcoat etc..

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post #169 of 185 Old 02-24-2014
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Re: Embedded Chain plate maint/replacement

Wait, I thought you had a dust factory. That almost looks like a boat interior.

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post #170 of 185 Old 02-24-2014
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Re: Embedded Chain plate maint/replacement

The quickest and easiest way to create the landing you need is to wrap the chains in packing tape, put a thick bed of thickened epoxy down where they will mount and put the chains in place.

Clean up the squeeze out and wait for the epoxy to kick. Then remove the chains, peel off the packing tape and you're ready to remount them.
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