1. Anti-rust performance of grease

  Anti-rust performance is used to evaluate the protection of grease to bearings in the presence of water or water vapor. Important for greases used in wet environments. The commonly used method is GB/T5218 bearing static anti-rust test: put the grease into the bearing, put the bearing in an oven at 52 ° C and a relative humidity of 100%, and observe whether the bearing has corrosion points after 48 hours to judge the grease. rust resistance performance level. In recent years, the dynamic anti-rust test commonly used abroad has been introduced, namely the Emcor test method: immerse half of the bearing in distilled water or seawater after being greased, run for 8 hours, stop for 16 hours, and observe the rust condition of the bearing after 7 consecutive days to remove the top grease. rust resistance performance level. This method is more severe than the static anti-rust test conditions, and is used to evaluate greases with strict requirements against water and seawater.

 2. Anti-corrosion performance of grease

  The corrosion test is an indicator to check whether the grease corrodes the metal. The anti-corrosion properties of the grease are particularly important for protective greases. 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 piece into the grease, take out the metal piece after the specified time and temperature, observe the change of the color of the metal piece, and compare it with the standard color plate to judge the corrosion level of the grease or whether it is qualified or not.