galvanizing?

[CMedeir0s]

im starting to zinc coat my body on my 67 coronet has any one else done this or known anyone who has?
i mean old porsches volvos saabs used this and they would never rust but i dont wanna do it and 1 yr later it comes through

 

[Cornpatch MO]

We were just talking about galvanizing. at lunch today. how is that process done?

I always heard that galvanizing had to be treated with something like vineager to get paint to stick to it.. True?.......................MO

 

[hemijoe]

you need to wash it with zinc phosphate then prime it with zinc chromit primer before you can re pimer with epoxy primer or it wont stick it will peal off in 6 months as for zinc plating it is applied electricly in a hot tank :nike:

all the early A bodies had galvanized rockers inner and outer but that was all the did

 

[HT413]

Hot dip galvanizing the body?? Sounds bullet proof but pretty spendy. Geez, you do that and you can park the car in the swimming pool and never worry about rust.

 

[MoparBill]

We send things out to get hot dipped from our shop- things like railings and platforms that will be outside. A good amount of it comes back tweaked from the heat and it's all heavy gage. I can't imagine that you could hot a body without distortion.

 

[Cranky]

NEVER use vinegar on steel! Read this.... http://knoxzine.com/all/2014/05/06/get-rid-of-your-rust/
I have some experience using vinegar and well, I don't use it anymore.

 

[Photon440]

A good read, Cranky. And a guy who installs auto glass was over here doing some work for my son, and he cautioned against using RTV to seal a window, since acetic acid (vinegar) is released as it cures, and can rust out the window channel.

I still use molasses though.

 

[HT413]

We send things out to get hot dipped from our shop- things like railings and platforms that will be outside. A good amount of it comes back tweaked from the heat and it's all heavy gage. I can't imagine that you could hot a body without distortion.

Great point, they use some serious heat on the process. Do you recall what temp it's done at? I learned that in college but can't quite remember.

 

[benno440]

hot dip galvanizing a car body is a bad idea, it will distort the body, you will have to re- tap every hole, the surface finish is not very nice and definetly not smooth, paint does not like sticking to it

 

[snakeoil24]

Galvanizing is done First in a bath of Caustic Soda TSP Trisodium Phosphate, at 180F, then the steel is neutralized in Phosphoric acid with Electric charge. Once this is done a heated bath of Zinc Chromate is heated to 175F and the metal is dipped in a hot tank. Once the body is removed it dries quickly. Their is no possible way to do this at home, anyone telling this is piossible is pulling your Pud! To begin with Zinc Chomate in a hot bath is so severely poiusionus it will colapse a lung in seconds and good bye Charlie. Also the term cold Galvanizing is another pull on the pud!

 

[satman72]

Great point, they use some serious heat on the process. Do you recall what temp it's done at? I learned that in college but can't quite remember.

Well, zinc melts at just above 787 degrees F. So i'm gonna guess that it's somewhere beyond that point.

 

[Photon440]

Snakeloil24, I think you just described a method of applying zinc chromate, which has a yellow appearance and isn't in much use any longer.

Cold galvanizing can be done at room temperature and uses a electrolysis and a solution of zinc sulphate, giving a silvery white coating that gradually dulls to grey with time. It is this cold galvanizing that is used on factory plated parts on modern cars, not the hot dip process which as satman72 points out, would be at around 800 degrees F. I've watched hot dipping, and it was usually things like buckets full of large industrial bolts, boat anchors and other heavy things that wouldn't warp.

I suspect that the OP was referring to zinc rich paints that offer some of the protection of galvanized metal but can be brushed on.

 

[sleepar]

On my 67 coronet the rockers, trans cover, head light bezels, and the brackets under the door sill plates in the rear were galvanized and a few other small pieces....

Galvanized can weather and be painted when it gets dusty to the touch or treated with galvanized primer... aluminum is the same process and galvallume like on exaust system can be painted once it's been hot a few times and gets dusty....

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Well, zinc melts at just above 787 degrees F. So i'm gonna guess that it's somewhere beyond that point.

Hot dipped nails are done at this temp.... a car body hot dipped would weigh so mutch it would collapse under its own weight.... for the trouble why not copper clad the car and plate it in nickel then chrome.... it would weigh a few thousand pounds more.... but would kool on 12 ply tires.