How to check whether there is water in the grease?
June 01, 2021
How to check whether there is water in the grease, there are a few simple methods: 1. Use a test tube to take a certain amount of grease. If it is found that the oil becomes turbid or even emulsified, the mountain becomes transparent and becomes opaque, and it can be considered that there is water in the grease. 2. Heat the test tube. If there is aerosol or bubbles, water droplets or a "crack" sound on the tube wall, it is considered that there is water in the grease. 3. Lithium-based grease takes a thin copper wire, winds it into a coil, burns it red on the fire, and puts it into a test tube with test oil. If there is a "crack" sound, it also means that there is water in the grease. 4. Use a test tube to take a certain amount of grease, and put a small amount of copper sulfate (anhydrous, white powder) into the test oil. For example, the white color of the copper sulfate mountain turns blue, which also means that there is water in the grease.
If there is water in the grease, it will destroy the grease film, make the lubricating effect worse, and accelerate the corrosion of the organic acid in the oil on the metal. Moisture also causes corrosion of the mechanical equipment, and causes the additives of the grease to fail, which makes the low-temperature fluidity of the grease worse, and even freezes, blocks the oil circuit, and prevents the circulation and oil supply of the grease. When moisture is present, the possibility of emulsification of high-temperature grease increases. When the temperature reaches a certain level, the moisture will vaporize to form bubbles, which not only destroys the oil film and endangers lubrication, but also affects the circulation and supply of grease due to air resistance. For transformer oil, The presence of moisture causes the voltage resistance of transformer oil to drop sharply and is more harmful. Therefore, the grease must be checked for moisture before use, and if so, it must be dehydrated.
