No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Additional test failed of powder coating zinc-plated material




cold rolled material(MS) are ZINC plated and baked at 200 degree temperature for 30 minutes, then applied brown powder coating and baked it at 180 degree temp.for 40 mintues but after completion of process we got failed additional tests,the layer of powder coating get easily removed from the surface of the material by applying blade, please tell me how can we get the success test.

Ranjeet Singh Dhaliwal
employee - Chandigarh, UT, India
April 15, 2008



First of two simultaneous responses --

What pretreatment did you do before applying powder? You don't mention any.
If none, then the result is expected. Chromate, phosphate or silane pretreatment required on zinc surfaces.

And you mention "cold rolled" steel. How thick? If thin (1-3mm) then perhaps 40 mins is too long to cure polyester powder?

geoff_crowley
Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
crithwood logo
April 18, 2008



Second of two simultaneous responses --

Unfortunately, you inform us of the problems you are experiencing but no more. What type of powder, I presume it is not coffee or cocoa-powder:-)? What type of powder? What metal temperature do you achieve (not oven temp)? What film weight is being achieved? Once those bits of information are provided then you may get some answers from the experts. On my part I will then contact you direct (a long analysis) with a shorter version for this forum.

Terry Hickling
Birmingham, United Kingdom
April 19, 2008




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a 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  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"