netneut -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
topic 4565

Powder coating of zinc electroplated steel parts


We powder coat a lot of cold rolled steel and aluminum parts. Sometimes the steel parts need to be zinc electro-plated first, because the part needs to have area masking for electrical conductivity. We have experienced outgassing or something that causes bubbles and pinholes in the finish. What is the best way to preteat this substrate to get good results. Is preheating the right thing to do?

Alan Purdey
Wesgar Industries - Vancouver, BC, Canada


I have experienced that before with alkaline zinc, and it was related to the thickness of the zinc plate, when we plated at .2-.3 mils it was ok, above .3 mils our customer complained about the little blisters. It was a bright finish and at the time I thought it might have been related to the entrained brighteners vapping out during the powder cure, but in any case cutting down the plating thickness to below .3 mils fixed the problem and we kept the job.

Ward Barcafer, CEF
aerospace - Wichita, Kansas

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's 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

©1995-2017     -    Privacy Policy
How Google uses data when you visit this site.