finishing.com logo
  HOMEFAQsBOOKSHelpWantedAdvertiseContactFORUM Letter 29211

The finishing.com Hotline -- Serious Education ... plus the most fun you can have in metal finishing

Paint chip-off

++++

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


++++

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

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

Disclaimer: It is 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; 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. & DevicesUsed & Surplus


©1995-2015 finishing.com     -    Privacy    -    Search