Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to __________.
Official USCG Answer & Rule Citation
Correct Answer: Option B — form a protective film on metal surfaces
Corrosion inhibitors and soluble oils added to closed diesel cooling water systems form a microscopic passivating chemical film over ferrous and non-ferrous metal surfaces, preventing galvanic corrosion and cavitation erosion.
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