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.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Metals and Alloys
125 free Metals and Alloys MCQs from Dental Materials, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Dental Materials questions like this
Dental Materials is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Metals and Alloys questions
Flux is used during casting to________________?
The maximum carbon content of steel used in dentistry is__________________?
The most commonly used Titanium alloy for dental and medical purposes is________________?
Gap between true end of casting ring and wax pattern should be______________?
Addition of large amounts of platinum to a casting gold alloy will________________?
White gold alloy predominantly is______________?