David Zimmermann, Pivot Point Inc. | Machine Design
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Fasteners often come into contact with dissimilar metals—a recipe for corrosion. To prevent corrosion (and add some aesthetics), engineers often recommend that fasteners be plated or coated. Here is a quick look at some those platings and other finishes.
Anodizing. An acid dip provides aluminum (and aluminum only) parts with a frosty, etched appearance. It offers excellent corrosion resistance, and parts can be color dipped after being anodized. (…)
via A Primer on Plating and Finishes for Fasteners | Fasteners content from Machine Design.