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topic 29211

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


2004

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

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