Lubricating system protection. Corrosion of the bearing surfaces of a lubricated mechanism is reduced or prevented by adding an aqueous solution of sodium nitrite to the water‐immiscible lubricant in the lubricating system so that the solution is dispersed, but not permanently emulsified or dissolved, in the lubricant. The process may be applied to machinery having a closed or forced system of lubrication, particularly where the possibility of water having access to the working parts exists. Thus the process may be applied to marine turbine installations where leakage of sea water into the oil system may occur. The lubricant employed may be a straight mineral oil and the pH of the dispersion is preferably maintained between 6.5 and 9. A wetting agent, such as sodium petroleum sulphonate or a sulphated secondary alcohol, may be added to facilitate the separation of the aqueous phase from the dispersion whenever it is desired to remove the aqueous phase, for example by means of a centrifugal separator. According to the Provisional Specification, corrosion inhibitors other than sodium nitrite may be employed.—Brit. Pat. 681,248, S. E. Bowrey.
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