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10 Apr 2014
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power coat verses galvanise
What do people think? for parts that I can remove and clean up, before refitting. I need to stop the rust.
Graeme
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10 Apr 2014
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I used to make bits for boats. You cannot beat hot dipped galvanising.
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11 Apr 2014
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Powder coating lifts off the surface it's supposed to save, you will get rust underneath where you can't see it
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11 Apr 2014
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If they are going to see any weather galv them as said power coating will lift and rust underneath
H
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11 Apr 2014
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you just have to be careful not to warp it if galvanising. the other option for small parts is passivating.
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11 Apr 2014
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Please note, I specifically said to use the "hot dip" process. there are a number of places that call spraying on a zinc based paint "galvanising". Only true hot dip is good. the rest are useless.
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12 Apr 2014
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Anodizing or Chrome ?
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12 Apr 2014
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Quote:
Originally Posted by oldbmw
Only true hot dip is good. the rest are useless.
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Hot dip galv may not lend itself well to small complex parts.
I would try to find a local plating company and go and have a chat. There are electroplated and passivated coatings that can give good protection when properly matched to the expected environment.
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12 Apr 2014
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Quote:
Originally Posted by oldbmw
Please note, I specifically said to use the "hot dip" process. there are a number of places that call spraying on a zinc based paint "galvanising". Only true hot dip is good. the rest are useless.
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Absolutely, hot dipped is far the best way to protect steel, any closed box sections like side protection bars should be drilled in several places (in a discreet area) prior to hot dip galvanising to allow the zinc to flow through and coat the inside and to prevent heat/air pressure from warping it.
My Dad has a boat trailer he designed and had built in 1982 in the back garden that was hot dip galvanised - still looks new today.
Yeah its not so good for small parts, but for protection bars and roof racks on a 4x4 its by far the best process.
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12 Apr 2014
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Thanks for the replies, Griff I don't suppose your dad got the trailer dipped in Poole? if so where
Graeme
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13 Apr 2014
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Hi Graeme
I think the trailer was built near Bristol somewhere, cant remember the name of the company, but I had some parts galvanized about 10 years ago in Poole and these guys did it:
Wessex Fabrications - Gates, Railings, Fire Escapes in Poole and Bournemouth
worth giving them a call for a quote.
the only thing to bear in mind with hot dipping is that any threads might need to be cleaned out afterwards with a tap.
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13 Apr 2014
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Thanks Grif, I will call them.
Graeme
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14 Apr 2014
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Quote:
Originally Posted by Gipper
Hi Graeme
the only thing to bear in mind with hot dipping is that any threads might need to be cleaned out afterwards with a tap.
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Very true, I machined up a set of keel bolts and had to put them back into the lathe to clean them. Quite a task as zinc is soft and clogs cutting tools easily.
Some places can actually "spin" threaded parts to help alleviate this problem.
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20 Apr 2014
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I've used Wessex galvanizers several times for LR chassis and other bits (side sills/B pillers etc)
always been good and fairly reasonable in price.
they're in Southampton area, not far off the A34 heading south.
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20 Apr 2014
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Quote:
Originally Posted by Drwnite
Anodizing or Chrome ?
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Anodizing is for Aluminium, chrome is for steel.
Anodizing ally is a great way to go. Surface toughens the ally, and stops the black rub-off, and prevents corrosion.
__________________
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