1. Anti-rust performance of grease

  The anti-rust performance is used to evaluate the protection of the grease on the bearing in the presence of water or water vapor. It is of great significance for grease used in wet environments. Commonly used methods are GB/T5218 bearing static rust test: put grease into the bearing, and place the bearing in an oven at 52 ℃, relative humidity of 100%, and observe the bearing for corrosion points after 48 hours to judge the grease Anti-rust performance level. In recent years, the Emcor test method, a dynamic rust test commonly used abroad, has been introduced: immerse the bearing half of the grease in distilled water or seawater, run for 8 hours, stop for 16 hours, and observe the rust of the bearing after 7 consecutive days to remove the top grease Anti-rust performance level. This method is more demanding than the static anti-rust test conditions, and evaluates the grease with strict requirements for resistance to water and seawater.

 2. Anti-corrosion performance of grease

  The corrosion test is an index to check whether the grease is corrosive to the metal. The corrosion resistance of grease is particularly important for protective grease. The commonly used methods for measuring the corrosion performance of grease are GB/T7326 copper sheet corrosion test method and GB/T0331 grease corrosion test method (T3 copper sheet, 45# steel sheet). They all insert the test metal sheet into the grease, take out the metal sheet after the specified time and temperature, observe the color change of the metal sheet, and compare with the standard color plate to judge the corrosion level or pass or fail of the grease.