No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Paint chip-off

2004

Greetings!

I would like to ask, what are the probable causes of paint chip-off after phosphating has already been done to the metal?

Thanks!

Richard MIsa
automobile restoration - Manila, NCR, Philippines

Hi Richard,

Poor cleaning, poor phosphating, poor rinsing, poor paint application and poor paint curing are possible causes for your problem.

George Gorecki
- Naperville, Illinois
2004

The most common cause I have seen over the years is poor rinsing prior to phosphating. The phosphate forms crystals on the surface due to a pH change. This is normally the result of the acid reacting with the metal. A layer of soap gives the required pH change to form the crystals without any real adhesion to the metal.

Ronald Zeeman
Coil Coating - Brampton, ON, Canada
2004

(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: