Method and composition for indicating the presence of chrome-fre

Details Method and composition for indicating the presence of chrome-fre Method and composition for indicating the presence of chrome-fre

1994-09-13

1996-05-14

Warden, Jill

Chemistry: analytical and immunological testing

Tracers or tags

436 2, 436172, G01N 2176

Patent

active

055166962

ABSTRACT:
A method and composition for indicating the presence of a chrome-free pretreatment for improving the paint adhesion and corrosion resistance of a metal surface. The presence of the pretreatment is indicated by adding a compound to the chrome-free pretreatment which causes the pretreatment to fluoresce under an ultraviolet light. The additive which causes the pretreatment to fluoresce under an ultraviolet light is an ultraviolet tracer, such as a stilbene or a coumarin derivative, and the method according to this invention includes exposing the coated metal to ultraviolet light.

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