chromate conversion process

Chromate Conversion Process

Name a metal and it can probably benefit from our chromate conversion process.

As you know, aluminum, copper, silver, zinc, tin, and many other metals tend to rust. Chromate conversion coating is a method used to protect these metals (though usually not iron and steel) from corrosion. Preventing rust saves you time and money by extending the service life of your metal parts and equipment.

For more than 50 years, Midwest Metal Products has provided only the highest quality products. We’ve served various industries including aerospace, electronics, and medical. Precision and perfection matter to us.

We’ve also developed our own RoHS/REACH-compliant chromate conversion process among many other fabrication capabilities. Our systematic approach gives you the most corrosion-resistant coatings possible.

Unlike anodizing— where aluminum oxide is part of the structure and is not applied to the surface—our chromate conversion process coats cover metal surfaces.

Sometimes called chemical film, chromate conversion coatings can also sustain electrical conductivity or as a primer for additional applications like paint and other topcoats.

Sheet Metal Chromating Process

We begin by thoroughly cleaning and polishing the surface of the metal. This careful pre-treatment process is critical. When done right, the surface sustains its anti-corrosive properties even when exposed to high temperatures, humidity, and structural damage. Chromate coatings can then self-heal these climate assaults and surface scratches.

Next, we immerse the clean metal surface in a water-based solution of chromium salts and acid. We can also spray the metal with an acidic chromium coating.

Finally, after we apply the chromate coat, we treat the metal with deionized water, run it through a rinsing bath, and dry the metal.

The final coating varies in thickness and appearance. From bright yellow to dark brown to greenish in hue, chromate coatings can be aesthetically pleasing and iridescent. Darker-colored finishes are usually thicker and provide the best corrosion protection.

Contact Midwest Metal today to discuss how we can help with all your fabrication needs.