Powder coating galvanised steel

[Weldinator]

Can steel that's been galvanised be powder coated and if it can, should i degrease it then wrap it up when taking it to get powder coated ?

 

[Shox Dr]

Yes it can.The powder coaters will(should) deal with prep

 

[Weldinator]

Cool, i was worried they would beadblast it like they do other parts etc.

I shall get it sorted next week, cheers.

 

[Hitch]

Twin pack spray is a better finish. Powder coating is cheaper, but will leave tiny pin holes. When the powder is baked on, the galv releases zinc oxide, which shows up as tiny bubbles/pin holes.

Either or, they will sort out prep. You probably will need to take off any big lumps.

 

[Engineer1964]

I made a load of balconies which where galvanised and then painted. I had to fill the galv vent holes afterward they came back from the galv then sent them to the sprayers

 

[Weldinator]

Interesting, i assume you meant 2 pack not twin pack ??

The part i want galv/painting does have big vent holes/cavities, however maybe thinned stonechip primer first would be more durable due to it being a chassis part ??

 

[Shox Dr]

Chassis part!

I wouldn't powder coat a chassis part, once the surface is broken water gets in via capillary action and the game is over,regardless of whether it's galv underneath

Galvanising is to an extent self repairing= zinc platelet . You need to cover it in a coating that can withstand movement and indentation, and also be easily repaired. Power coating doesn't do that.

 

[Weldinator]

It has been seam welded so it wont have much movement, can galvanising be stone-chipped or shall i get the paint place paint it in enamel instead ?

But instead of galv is there a harder wearing treatment i could get it prepared in ?

 

[Hitch]

I mean a 2 part, epoxy seems to be what is always reccomended to me.

 

[Engineer1964]

I spray painted a series 3 galv chassis with Black hammerite smooth paint, 3 coats made it ideal for jetwashing after a bit of offroading

 

[Weldinator]

What are peoples thoughts on getting chassis parts in chemical black coating instead ?

 

[PhillipM]

Madness tbh.
Chemical black isn't really a rust preventative - it won't even stop rust indoors in a dry, warm environment without a wax or oil coating being re-applied regularly.

Black Zinc would be far better, but black oxide will be rusted before the week is out.

 

[Weldinator]

It does not say anything about rust but it wont chip or scratch.

http://www.splblacking.co.uk/SPL_web_studio_home_page/Chemical_Blacking.html

 

[PhillipM]

It'll rust like hell, it's only really any good if you fill the pores in it with oil or wax, but outdoors that soon disappears within a few days.

 

[Weldinator]

I wonder why they use it at all then, what type of products are usually blacked ?

Does anyone have any pictures of products painted in epoxy ?

 

[PhillipM]

Indoor-use tools and decorative pieces usually, cheap bolts, and precision fit components that will have an occasional oiling, as it doesn't change surface dimensions.