Discussion
Extreme pressure lubrication relies on additives that
Answer: C
Correct answer: react with the metal to form a low-friction film
Extreme pressure additives contain sulphur, chlorine or phosphorus and react with the metal at the high local temperature of an asperity contact, producing a soft sulphide or phosphide film that shears easily. The reaction is deliberate and localised, occurring only where and when the contact becomes severe.
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