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 8853

Maximum dry-off oven temperatures for phosphate coatings


Dear Reader:

We are having a dispute in our company as to the maximum temperature (and time) we can have in our dry-off oven without dewatering our lightweight iron phosphate coatings produced in our 6 stage spray washer. We also have another line that uses zinc phosphate for automotive parts, and have disagreed as to the maximum temperature (and time) for that dry-off oven as well - before dewatering of the coating occurs.

Does anyone have a technical article that they can refer me to so I can read it for myself, or, if not, let me know by response to this inquiry in the usual written fashion.

Many Thanks,

Tom Meyer
- Milwaukee, Wisconsin, USA



Stoving times are very flexible. At temps above 150 deg C for 20+ mins 2 molecules of water will be driven off from zinc phos. This is NOT detrimental in any way. Above 250 deg C complete dehydration will occur and this will most definitely adversely affect performance. Lightweight iron will be less affected. In short you could use powder cure temps for drying and not suffer!

Roger Bridger
- Croydon, UK

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.