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Old 29-01-2015, 14:34   #1
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Zinc Plating

So I'm installing new keel bolts, but the bolts I found have not been zink plated for corrosion.. and while doing some research I found the system is pretty simple.. And used to brighten up many parts on cars..
Has anyone done any Zink Plating on their motor parts and if so how did it work..
I'm looking for first hand experance from someone that has played with such......................
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Old 30-01-2015, 06:17   #2
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re: Zinc Plating

Keel bolts are usually Monel, Silicon Bronze, Stainless Steel, or exotics such as Aquamet.
I wouldn’t recommend ungalvanized mild steel bolts.
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Old 30-01-2015, 06:26   #3
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re: Zinc Plating

In the aircraft world for high strength steel parts like main wing spars, we usually Cadmium plate, zinc is sort of reserved for things not so important as spar caps or keel bolts.
One thing to be careful is dissimilar metals corrosion as I'm sure there is some form of insert in the keel that these bolts, actually probably studs screw into.

I don't believe zinc is used as a decorative coating on automobiles is it, unless maybe it is an intermediary step in the chrome plating process?

I'd be very careful with keel bolts, I would contact the manufacturer or an expert before I substituted materials
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Old 30-01-2015, 06:50   #4
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re: Zinc Plating

Quote:
Originally Posted by Randyonr3 View Post
So I'm installing new keel bolts, but the bolts I found have not been zink plated for corrosion.. and while doing some research I found the system is pretty simple.. And used to brighten up many parts on cars..
Has anyone done any Zink Plating on their motor parts and if so how did it work..
I'm looking for first hand experance from someone that has played with such......................
Randy--

You can probably have the bolts you've found electroplated but, given the cost of that service, together with the cost of the bolts themselves (you need Type 8-8, M20), you are likely to find that simply ordering the bolts from Ward or Todd over at Beneteau is less, or no more, costly without the brain damage.

FWIW...
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Old 30-01-2015, 08:06   #5
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re: Zinc Plating

The zink plating is just an added protection, The bolts are class 10.9 so will work fine, even better than origional..
My experance is as an ICC Special Inspector, in high strength bolting amoung other...
I've seen kits from companys like EastWood for zink plating and was wondering if anyone had first hand experance..

The bolts of a First 42 are a short 80mm bolt going into a plate atop the keel.
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Old 30-01-2015, 08:14   #6
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re: Zinc Plating

and the plating
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Old 30-01-2015, 10:01   #7
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re: Zinc Plating

Zinc plated hardware is at the bottom of the food chain, and is no replacement for galvanized.

The correct bolts are available from Ward @ Beneteau. And are identified "Big Bolt (seriously).
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Old 30-01-2015, 10:14   #8
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re: Zinc Plating

most the zinc plated parts I've seen are worthless....they corrode immediately... do you mean galvanizing?
If the bolts are that short and normal... go with a good material as mentioned above.
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Old 30-01-2015, 11:24   #9
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re: Zinc Plating

Quote:
Originally Posted by Randyonr3 View Post
Randy--

It can't hurt and might help. Just remember to coat the exposed heads/cut washers with RustLok or something equal. Note, however, that the Bene bolts (17) were selling for only $149.77 a set when the Dollars/Euro's/Franc's exchange rate was much less favorable than it is now. That seems little enough to me to go for (potentially) false economies. Your call however.

FWIW...
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Old 30-01-2015, 11:41   #10
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re: Zinc Plating

Quote:
Originally Posted by Randyonr3 View Post
So I'm installing new keel bolts, but the bolts I found have not been zink plated for corrosion.. and while doing some research I found the system is pretty simple.. And used to brighten up many parts on cars..
Has anyone done any Zink Plating on their motor parts and if so how did it work..
I'm looking for first hand experance from someone that has played with such......................
Buy the proper bolts, don't try to re-engineer something. You boat is worth doing things right (I hope).
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Old 30-01-2015, 22:20   #11
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re: Zinc Plating

Dont want to offend anyone but, you guys dont know what you are talking about,
The only reason I didnt buy the bolts from Beneteau is because they dont offer a class 10.9 bolt. the bolts from Beneteau are class 8.8.. I wanted a better bolt. and the washers they offer are crap, I was able to get the washers in class 10.9 also.. The zink platting was just an additional additive to keep them warm and fuzzy..
You can see by the picture, the one on the left is the bolt pulled out, the replacement is the bolt on the right, and also a better quality bolt than Beneteau offers.....
As I said before, High Strength Bolting is my business, In the origional post, I had only asked if anyone had used the platting system..
Thanks for your input, but I think I have the keel bolt issue under control...
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Old 30-01-2015, 22:57   #12
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re: Zinc Plating

Quote:
Originally Posted by Randyonr3 View Post
...I think I have the keel bolt issue under control...
You ought to bone up on plating, though.
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Old 30-01-2015, 22:59   #13
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re: Zinc Plating

Please just reassure us that zinc electroplating is not being relied on for corrosion protection in a marine environment. My experience is that "electro-galvanized" parts don't rust - until they're taken out of the store... I am referring to electroplating of non-stainless steel parts.
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Old 31-01-2015, 02:57   #14
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re: Zinc Plating

Sounds interesting, Hopefully the zinc plating shouldn't interfere with the thread at all but I doubt it would. I can see you spending hours polishing up all those bolts for a nice super shiny finish
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Old 31-01-2015, 04:03   #15
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re: Zinc Plating

The zinc plating won't interfere. It will thread easily into the cast iron keel. The problem is that the whole reason for replacing these keel bolts and washers is corrosion, for which zinc plating is vastly inferior to galvanized.
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