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How are under-hood components rust-proofed?

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Generally speaking, if I use mild steel parts, I get them Zinc Plated with a chromate film. On motorcars, most of the parts used under the bonnet are mild steel and do not rust. I don't believe they are zinc plated. What finish do they use?

Mark Z
Mechanical Engineer - Cape Town, WP, South Africa

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Some of the parts are aluminum, some are painted (probably galvanneal), and some are zinc or zinc-alloy plated with chromate or trivalent chromate films. And, looking under my hood, a lot of them have rusted after 5 years :-)

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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