[Healeys] Powder Coating

Tom Felts tomfelts at windstream.net
Mon May 13 05:35:12 MDT 2013

I've seen that beautiful bridge 2 times and over it once--never climbed to the top---too many others things lined up to have the time.  Such a beautiful city and country!!  Blue Mountain is georgous.


---- Joe and Lenore Armour <sebring at hotkey.net.au> wrote: 

This process is often seen as the 'magic solution' but!

I was involved in an engineering exercise on Sydney's famous bridge ( 
for those considering a visit 'down under' make sure you go 'up and 
over'  as walks are available to the top of the bridge arch every day)

The specification called for powder coating of the steelwork. No Coater 
was able to give me an Australian Standard or warranty that their 
product provided. Finally I located the manager of a large corrosion 
protection company who said;
powder coating was developed in the architectural field for aluminium 
due to its basic corrosion resistance ( not does not corrode) and nice 
surface finish. Basically it acts as a condom to exclude the atmosphere 
but when torn or broken through it offers no protection and in the case 
of steel it can trap the water and iron oxide quickly forms and as rust 
grows to  seven times the volume of non rusted steel it quickly breaks 
out and looks very unsightly offering no protection.  His solution as to 
the  application of powder coating was;  grind the powder very fine ( a 
special order) to avoid air gaps and porosity of the powder coating 
product.  Prior to application grit blast the surface and apply a paint 
type primer, then an undercoat these two providing best protection and 
THEN apply the nice looking powder colour of your choice.

Industry will always prefer a zinc rich primer undercoat that has a 
chemical sacrificial protection of the metal surface. This can then have 
nice colour finishes to complete the job and provide a suitable image
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