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-----Powder Coating
2002
I have a few questions regarding a powder coated fence:
1. Will a continuous spray from lawn sprinklers with hard water cause a powder coat finish to degrade or the steel underneath to rust?
2. Will a continuous spray from lawn sprinklers with hard water cause welded joints that are powder coated to rust?
3. Is it a correct assumption that the steel and joints will not rust? Is the powder coat a barrier from the water?
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contractors - Phoenix, Arizona, USA
First of two simultaneous responses --
Lee,
In part your assumption is correct, powder coating will protect the substrate from water ... if .... the cleaning and pre-treatment of the substrate is correct and the application and curing of the powder coating is correct and finally if the right powder coating chemistry is used.
Drew Devlin- Lincolnshire
2002
Second of two simultaneous responses -- 2002
Hi Lee,
1. Quite possibly, yes.
2. Quite possibly, yes.
3. No, it is a bad assumption. Yes, powder coatings act as a barrier, but only in limited fashion.
- Naperville, Illinois
And, yes, usually the weld area will be attacked first, both because it is a bit harder to pretreat and coat, and because the stresses make the weld area electrochemically anodic to the rest of the metal.
Ted Mooney, P.E.
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finishing.com - Pine Beach, New Jersey
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2002
Your finish is dependent on the pretreatment process. Blasting of the welds and a iron phosphate pretreatment will extend your life product life.
Steve Mossige- Dallas, Texas
2002
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