-- The Home Page of the Finishing Industry

on this site
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 18187

Powder Coating


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?

18187-1 18187-2 18187-3
18187-4 18187-5 18187-6
Lee J. Andrews
contractors - Phoenix, Arizona, USA

First of two simultaneous responses -- 2002


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

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.

George Gorecki
- 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, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"


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

If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2019, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.