Non-chrome conversion coating

Details Non-chrome conversion coating Non-chrome conversion coating

1998-06-09

2000-02-22

Willis, Prince

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148274, 148283, C23C 2200

Patent

active

060275782

ABSTRACT:
A chrome-free conversion coating composition for use over zinc-plated metal comprises a combination of a transition metal oxide, and a polyhydroxy aromatic to provide a coating that eliminates environmental concerns regarding chromium disposal. Aluminum chlorohydrol is also included in the composition to provide an aesthetically pleasing blue appearance. The conversion coating composition is combined with water to form a bath. Zinc plated metal is immersed in the bath to apply the coating.

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patent: 4944812 (1990-07-01), Lindert et al.
patent: 5039770 (1991-08-01), Lindert et al.

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