Corrosion control: The role of a lubricant in controlling corrosion of the surfaces them-selves is twofold. When machinery is idle, the lubricant acts as a preservative. when machinery
is in use, the lubricant controls corrosion by coating lubricated parts with a protective film that may contain additives to neutralize corrosive materials. The ability of a lubricant to control corrosion is directly related to the thickness of the lubricant film remaining on the metal surfaces and the chemical composition of the lubricant. Additives that react with the sliding surfaces enhance the corrosion control of the lubricant.