Which of the following is/are the classic cases of fretting corrosion?(a) Bolted tie plates on railroad rails(b) Press-fitted ball bearing race on a shaft(c) On ball bearings(d) Bolted tie plates on railroad rails and press-fitted ball bearing race on a shaftThis question was posed to me in examination.This is a very interesting question from Eight Forms in section Eight Forms of Corrosion of Corrosion Engineering

Which of the following is/are the classic cases of fretting corrosion?

1.	Which of the following is/are the classic cases of fretting corrosion?(a) Bolted tie plates on railroad rails(b) Press-fitted ball bearing race on a shaft(c) On ball bearings(d) Bolted tie plates on railroad rails and press-fitted ball bearing race on a shaftThis question was posed to me in examination.This is a very interesting question from Eight Forms in section Eight Forms of Corrosion of Corrosion Engineering
Answer» The correct option is (d) BOLTED tie plates on railroad rails and press-fitted ball bearing RACE on a shaft Easiest explanation: Fretting corrosion occurs at contact AREAS between materials under load subjected to vibration or repeated relative motion. And it doesn’t occur on materials in CONTINUOUS motion such as on ball bearings.

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