Re: [DML] galvanizing D frame?

["Donald Ekhoff" <ekhoff@xxxx>]

I have had a little experience with the hot dip process as I built the sub
frames for the Alaskan Pipeline Buildings. They were 3" and 4" steel
channel and 10 ft by 14 to 16 foot long. They were therefore about the same
size and the dip tank was ~ 20 ft long by 12 ft wide by 10 ft deep filled
60% full. The process is fairly quick. If there is paint or epoxy to
remove it will take a little longer and I do not know if they would tolerate
all the epoxy on a DeLorean frame. The burnt off mat'l floats on the top of
the tank and can be skimmed off along with the oxide layer of metal that
invariably forms.

Upon removal of the frame the operator will typically intentionally swing
the frame into the side of the tank to shake off as much excess metal
including slag and drips. This can leave a considerable dent as the frame
is soft and at temperature when it is done. Also there will be some thermal
shock and probable distortion. Care allowing it to come up and down in
temperature without thermal shock would help this. Also there MUST be total
drainage with holes a minimum of 1" or huge and heavy pools will remain.
Clean drainage is a must and will minimize the operators need to bang the
frame. A hotter dip tanks yields better drainage and nicer parts. A cold
tank can leave really nasty drips and sludge. Look at other large parts
being run for insight as to whether you want your frame to look the same
way.

Hope this helps.

Donald L. Ekhoff


----- Original Message -----
From: "Ralf Philipp" <doc.brown@xxxx>
To: <chrisparnham@xxxx>
Cc: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Tuesday, June 05, 2001 10:39 AM
Subject: [DML] galvanizing D frame?


> Hi Chris!
> Hi list!
>
>
> You mentioned the trials on a galvanized frame.
> What exactly means "galvanizing"? Is this...
>
> 1.) putting the frame into a relatively cold bath of chemicals, putting a
> voltage between the frame and the bath and thus getting a thin coat of
zinc
> (or whatever) on the frame?
>
> or
>
> 2.) putting the frame into a very hot bath of liquid zinc, thus getting a
> thick coat (100µm) of zinc which is extremely rust resistant?
>