Oxidation stability refers to the service life of lubricating oil.
The longer the oil is used, the more oxygen, water and dust it is in contact with the outside world, which leads to the shorter and shorter life of the oil.
Generally, the oxidation stability test of oil products is rotating oxygen bomb. The longer the time of rotating oxygen bomb test, the better the oxidation stability of oil products.
The ability of lubricating oil to resist oxidation and deterioration is called the stability of lubricating oil.
The stability of lubricating oil can be divided into anti-oxidation stability and thermal oxidation stability.
The first is the oxidation stability, is a thick layer of lubricating oil (oil thickness of more than 200 m) under the action of high temperature and oxygen in the air, oxidation resistance, lubricating oil at room temperature is very stable, but at high temperature, a very short time, the oil color black, viscosity change, increase in acid value, precipitation.
Generally, the lubricating oil is not easy to oxidize below 30°C, but the oxidation takes place vigorously above 150°C.
This is the case, for example, with the oxidation of lubricating oils in internal combustion engines, gearboxes, transformers, or pipelines.
So requires good antioxidant properties of lubricants.
Antioxidants are added to some lubricants to improve antioxidant stability.
Second, thermal oxidation stability, is a thin layer of lubricating oil (oil thickness less than 200 m) at high temperature under the action of oxygen in the air oxidation resistance.
This is true, for example, of lubricating oil between the piston and cylinder of an internal combustion engine and between the bushing of a steam turbine.
At this time, the working temperature of the lubricating oil is higher (200-300°C), and the catalytic oxidation of the metal on the lubricating oil is also stronger.
The oxidation result will produce a layer of adhesive film with strong adhesion, covering the metal parts, which will increase the wear, reduce the power, and make the heat conduction difficult, and seriously cause the parts to burn out.
SH0193C fully automatic rotating oxygen bomb tester is designed and manufactured according to national standard ASTMD2272-2009 "Determination of Oxidation Stability of Lubricating Oil" metal bath standard.
It is suitable for evaluating the oxidation stability of new and in-service turbine oils with the same composition (base oil and additives).
It can also be used to evaluate new mineral insulating oils containing 2, 6- BT-para-cresol as a rapid method for the assessment of their oxidation stability.
The test results are used to test new mineral insulating oils containing 2, 6-BT-cresol or 2, 6-BT-butyl phenol or both, and to continuously control the performance of each batch of oil.
Apparatus needed for experiment
1.SH0193C automatic rotating oxidation stabilizer, developed and produced by Shandong Shengtai Instrument Co., LTD.
2. In line with SH/T0193.
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