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To avoid corrosion, the valve is given a coating with what material?

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in Automotive Engine Design by (137k points)
To avoid corrosion, the valve is given a coating with what material?

(a) Copper

(b) Chromium

(c) Zinc

(d) Aluminum

The question was posed to me in an internship interview.

This intriguing question comes from Poppet Valves topic in portion Valve Timing Technologies of Automotive Engine Design

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Right option is (d) Aluminum

To elaborate: To avoid corrosion, the valve is given an aluminum coating. Aluminum oxide formed separates the valve stem from the cast iron seat to keep the face metal sticking.

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