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Chlorine Compounds
Table of Contents
Physical & Chemical Properties
Chlorine compounds continue to be used in some oils and commercial additives based on their reputation for reducing friction and improving anti-scuff properties. However, considerable danger of corrosion is present because of the chloride ion. Therefore, if a problem of corrosion including rusting is found, a chlorine analysis is suggested. Further, any halogen compound in oil creates disposal or re-refining problems. Rowe, Reference 13, has collected from the tribology literature, the wear coefficients, K, for 55 phosphorous compounds, 23 sulfur compounds, 21 dialkyldithiophosphates, and some combinations. The lower the K, the better the lubricant.
The wear tests were conducted on a four ball lubricant tester under various conditions. K (dimensionless) is defined as:
K = V X H divide by d X L
where V is volume of metal worn off, m3
H is metal hardness, kg m-2
d is distance slid, m
and L is load, kg
For example, TCP reduced the K of a paraffinic base oil from 28.5 X 10-8
to 0.29 X 10-8, or 100 fold.
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