ASTM D6138 Method for Corrosion-Preventive Properties of Lubricating Greases
ASTM D6138 Standard Test Method for Determination of Corrosion-Preventive Properties of Lubricating Greases Under Dynamic Wet Conditions (Emcor Test)
1. Scope
1.1 This test method covers the determination of corrosion-preventive properties of greases using grease- lubricated ball bearings under dynamic wet conditions.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D217 Test Method for Cone Penetration of Lubricating Grease
D665 Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
D1193 Specification for Reagent Water
2.2 ISO Standards:
ISO 15 Rolling bearings - Radial bearings - Boundary dimensions - General plan
ISO 3696 Water for analytical laboratory use - Specifications and test methods
ISO 7120 Petroleum products and lubricants - Petroleum oils and other fluids - Determination of rust-preventing characteristics in the presence of water
3. Terminology
3.1 Definitions:
3.1.1 lubricating grease, n - a semifluid to solid product of a thickener in a liquid lubricant.
3.1.1.1 Discussion - The dispersion of the thickener forms a two-phase system and immobilizes the liquid lubricant by surface tension and other physical forces. Other ingredients are commonly included to impart special properties.
3.1.2 thickener, n - in lubricating grease, a substance composed of finely-divided particles dispersed in a liquid lubricant to form the product's structure.
3.1.2.1 Discussion - The thickeners can be fibers (such as various metallic soaps) or plates or spheres (such as certain non-soap thickener), which are insoluble or, at most, only very slightly soluble in the liquid lubricant. The general requirements are that the solid particles be extremely small, uniformly dispersed, and capable of forming a relatively stable, gel-like structure with the liquid lubricant.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 corrosion, n - red rust or black spots on the race.
3.2.1.1 Discussion - any stain through which the underlying metal surface is still visible shall be ignored.
