Home
 
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
SEARCH🔍
the Site
no_pop_no_spam2

World's top finishing resource since 1989
Chime right in - No login req'd

topic 29688

Masking powder coating / painting on mild steel



2004

In our company, some of our electromechanical constructions are being made from mild steel sheets. Sometimes we use pregalvanized sheets but in some cases (welding...) we can't. As standard finish for protection we use powder coat painting with zinc phosphate as pretreatment. In some areas we want the surface free of paint (masked) for electrical conductivity. These areas are very sensitive to corrosion because zinc phosphate is not enough. If we provide electroplated zinc coating as a substrate under powder paint, the polymerization oven (powder paint polymerizes in 190 C) damages zinc's film and topcoat has no adhesion on the material

George Kontsas
plating shop - Larissa, Greece


2004

Please try it in the opposite order, George. Powder coat the parts and then, using the powder coating as a maskant, electroplate the zinc onto them. The selective powder coating can be done either with silkscreen patterns, or my masking the bare area of the steel which you will later want to electroplate.

I have seen this sequence used on decorative emblems, but with nickel-chrome or nickel-gold paint, so I see no reason why the powder coating shouldn't work just fine as a maskant for zinc plating.

Good luck!

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha

none
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA