Mid-City PlatingMid-City Plating Company Incorporated "A Reflection of Quality for over 30 Years"
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Mid-City Plating Company Services

Chromate Coversion Coatings

Chromate conversion coatings are applied to zinc plated surfaces to extend the corrosion resistance of the plating.  This extended protection is due to the corrosion-inhibiting effect of the chromium contained in the coating.  The conversion coatings also protect because of a barrier that is formed between the atmosphere and the zinc plating.

Clear Chromate (blue, bright or iridescent)
- Hexavalent or trivalent
- Zinc protection from 24 to 96 hours of salt spray test


Yellow Chromate (gold, brassy or bronze iridescent)
- Zinc protection from 72 to over 250 hours of salt spray test


Black Chromate
- Zinc protection from 48 to 200 hours with special processing


Olive Drab Chromate
- Zinc protection from 96 to 200 hours salt spray test.


Green Chromate
- Zinc protection from 240 to over 400 hours salt spray test


- An acrylic copolymer coating that is applied over the chromate to substantially improve salt spray resistance, abrasion resistance, and improve the general appearance of the product.  A Mid-City Plating specialized process.

Mid-City Plating Co., Inc.
921 East Charles Street
Muncie, Indiana 47305

765-289-2374 Phone
765-289-2520 FAX