Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
Correct answer: B. Chrome
- A. High quality iron
- B. Chrome
- C. Cobalt
- D. Nickel
Explanation
Chromium gives cobalt-chromium alloys corrosion resistance by forming a thin, adherent chromium oxide passive film on the surface. Cobalt contributes mainly to strength and rigidity rather than passivation.
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