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Phosphorous Compounds
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Physical & Chemical Properties

Various phosphorous containing compounds are added to lubrication oils to improve anti-wear properties. The most common is tricresyl phosphate (TCP). Other organo-phosphates and phosphates are used. These compounds are thought to adsorb on or react with the rubbing metal surface to form protective films of organometallic or iron phosphate. Some tribological parts, such as cam shafts, are pretreated to form thick iron manganese phosphate coatings to minimize metal-to-metal contact during break-in.

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