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Bilt Hamber Bilt-Hamber Laboratories has always used research, innovative chemistry and thorough testing as the way to produce better performing products. Every product released for sale has been extensively compared to and tested for superiority against market leading and specialist competitive formulations. From our clay bars to cavity waxes, etch primers to carnauba waxes and shampoos to rust removers, each Bilt-Hamber formulation has been made from conception to production with the same care.

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Old 06-04-2018, 12:28 PM   #1
Jay-C
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hot-dip glvanized trailer - protection

Hi,

I have hot-dip galvanized (100μm) trailer, similar like this one:



I'd like to offer some extra protection to the chassis and to the sides also.

How durable would UB be on the chassis?

And would it be ok to just wax the sides with auto-balm (sides are hot-dipped, front and back panel are electrogalvanized)?
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Old 06-04-2018, 12:49 PM   #2
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Do you know if there is any passivation on top of the galvanised coating ?

It could be chromate treated (trivalent chromium only now due to REACH legislation), or chromium free treated (normally a phosphate coating with zirconium or titanium) or it may even have a very very thin oil coating.

Same applies whether Hot dipped or electrogalvanised areas - note the electro sections will be much thinner coatings - general industry coatings used to be 2.5um thickness per side, but up to 10um per side were available. Thats an awful lot thinner than the batch galnavised chassis !.

Are you certain its electrogalvanised and not just a smooth finish hot dip coating (no spangle) ?



Sorry more questions than answers but some products just might not be compatible or bond with the surfaces.

Note also that even the old hexavalent chromate passivates are temporary corrosion protection for short term storage - not designed for protection of materials stored / used outside.

Perhaps the trailer manufacturer can be more specific about what they use for the trailer - chances are they buy the non chassis parts from steel stock holders, cut to size - can be a bit hit n miss if they aren't very specific about their requirements !

Last edited by percymon; 06-04-2018 at 01:37 PM.
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Old 06-04-2018, 12:58 PM   #3
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Dynax UB sticks like anything, assuming a clean and dry surface. Withstands some fairly vigorous pressure washing, so I'd imagine it would be pretty durable under normal use.
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Old 06-04-2018, 01:24 PM   #4
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This manufacturer is highly appreciated one, they have ISO 9001 and ISO 14001 certificates. Frame is first welded:




and then hot-dipped, using a reputable factory founded in 1967.

They use hot-dip process which compiles SFS-EN ISO 1461 standard (20-year warranty for hot-dip galvanised coatings, without retreatment). Steel is first cleaned with diluted hydrochloric acid, then flushed and flux-bathed. Finally the steel is dipped into hot zinc (450°C). No further processing, only final check that the zinc-layer is even and has reached all parts, also inner sides of the tubes.

You may find more information from the hot-dipper:

http://www.aurajoki.fi/en/services-t...nizing/process

And yes, I'm certain that the front and back panels are electrogalvanized (10μm), I have checked it directly from the manufacturer.
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Old 06-04-2018, 01:28 PM   #5
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Just do what farmers seem to do to there trailers, cover them in
Mud, cow ****e and oil lol
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Old 06-04-2018, 01:38 PM   #6
Jay-C
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Quote:
Originally Posted by wish wash View Post
Just do what farmers seem to do to there trailers, cover them in
Mud, cow ****e and oil lol
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Old 06-04-2018, 01:39 PM   #7
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Quote:
Originally Posted by wish wash View Post
Just do what farmers seem to do to there trailers, cover them in
Mud, cow ****e and oil lol
which was fine when they had a load of carcenogenic chromate coating on them !
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Old 06-04-2018, 01:48 PM   #8
percymon
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Quote:
Originally Posted by Jay-C View Post
This manufacturer is highly appreciated one, they have ISO 9001 and ISO 14001 certificates. Frame is first welded:




and then hot-dipped, using a reputable factory founded in 1967.

They use hot-dip process which compiles SFS-EN ISO 1461 standard (20-year warranty for hot-dip galvanised coatings, without retreatment). Steel is first cleaned with diluted hydrochloric acid, then flushed and flux-bathed. Finally the steel is dipped into hot zinc (450°C). No further processing, only final check that the zinc-layer is even and has reached all parts, also inner sides of the tubes.

You may find more information from the hot-dipper:

http://www.aurajoki.fi/en/services-t...nizing/process

And yes, I'm certain that the front and back panels are electrogalvanized (10μm), I have checked it directly from the manufacturer.

Zinc coatings oxide naturally - its this oxide that then offers some protection to the next layer of zinc beneath the oxide - it doesn't look pretty (white rust, sometimes also black), but it does mean that at a non industrial, non coastal zinc corrosion rate of 1-2um per year that a batch galvanised chassis can last many many years due to the thickness of zinc. Of course if the trailer is subjected to road salt / salt water spray then that lifetime reduces.

You end panels will clearly have a much lower lifetime theoretically due to the much thinner coating.

I'm not casting aspertions on the trailer manufacturer, but 9001 just means they have a method of work and prove they stick to it - it doesn't necessarily mean its the correct method of work for the best end product (although if the product was rubbish they wouldn't be long for this world ). They probably have a spec for the end panels, but if its not very well worded and very technical then their supplier could source material from China one week, Taiwan the next, Thyssen Stahl in Germany the next. I've worked in that industry long enough to know how vague purchasing specs are and how little the supply chain know about materials, what they need and what they actually get delivered !
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Old 06-04-2018, 02:19 PM   #9
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Well percymon, as I told you already this manufacturer is a trusted one, we are not talking about china-sourcing company who uses cheapest possible materials.. There must be a reason why they have high reputation among users for decades. I can assure you I did some research before I opened my wallet

I have no doubt for the life expectancy of >25 years for this trailer. I just want to offer some extra protection, as I offer for my other equipment too.

So let's forget the offtopic.

Thanks steelghost for advice. I plan to use wax for the panels (to hot-dipped and electro) and UB for the underside. Any thoughts?
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Old 06-04-2018, 06:35 PM   #10
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Well good luck with protecting your trailer, hope you have no compatibility issues. I’m sure BH have come across such queries before ��
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