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High Corrosion Resistant Trivalent Chromate for Zinc

11/01/2002

PRESS RELEASE
For Immediate Distribution

Latest Production Capabilities Announced

Saporito's High Corrosion Resistant
Trivalent Chromate for Zinc Offered

Cicero, IL . . . Saporito Finishing Company's high corrosion resistant trivalent chromate is a
clear/blue chromate offering resistance for up to 150 hours to white rust (corrosion) and 264 hours
to red rust (chromate) when tested according to ASTM B117 neutral salt spray testing. The new
chromate produces an attractive, bright, blue trivalent chromate to meet automotive and other indus-
try standards.

When testing 1010 cold rolled steel panels, zinc plated to .0002" minimum thickness and chromat-
ed in the high corrosion resistant chromate, the panels showed only 3% white corrosion and no red
rust after 264 hours.

"Our high corrosion resistant chromate yields higher corrosion resistance than conventional hexa-
valent chromates while producing a more uniform and aesthetically pleasing blue-bright appearance
compared to the iridescence and non-uniform appearance of traditional hexavalent chromates,
including yellow and olive drab," explains Jeffrey Logan, Saporito's director of technical operations
and quality assurance.

The chromate also eliminates the environmental concerns associated with toxic hexavalent chro-
mates, while meeting the automotive and European directives to eliminate hexavalent chrome.
According to Logan, this mandate is finding its way from the automotive industry and into other
manufacturing segments. The trivalent chromate meets these concerns and addresses ever-tighten-
ing EPA restrictions.

High corrosion resistant chromate is not affected by baking or exposure to heats associated with cur-
ing processes typical in paints, powder coats and rubber molding, as well as service conditions.
Traditional hexavalent chromates dehydrate when exposed to temperatures in excess of 150 degrees
Fahrenheit. These dehydrated chromates crack and expose the substrate underneath which then cor-
rodes and fails completely. Trivalent chromates can be baked at temperatures up to 400 degrees
Fahrenheit with minimal degradation of their corrosion resistance making them excellent bases for
paints and rubber bonding and superior to hexavalent finishes.

Saporito Finishing is your single source for anodizing and metal finishing processes. Magnesium anodizing, metal plating, mechanical finishes and aluminum treatments.

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