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Summary:
The primary purpose of turbine oil rust inhibitors is to form water-repellent stable films on those exposed iron surfaces within the lubricating system and governor mechanism of steam turbines with which the lubricant comes in contact. Such additives are normally evaluated by ASTM Method D 665, but passing this test does not always assure satisfactory field performance. One reason is that some rust inhibitors, particularly those of the soap type, form loosely bound protective films which prevent adhesion of water only as long as it occurs suspended in an oil phase, but when the oil is absent, such films soon fail. A method to test the hydrolytic stability of rust-protective films is to expose them to the direct action of a continuously agitated water phase.
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Reproduction Note:
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1962. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
