The oil products for the storage test are all filled in tinplate circular iron drums with a capacity of 20L, a diameter of 265mm, a height of 385mm, and a wall thickness of 2.2mm. The entire test is divided into two groups: indoor and outdoor. a. Indoor group The 3 types of oil products in this group are stored indoors. The building is a frame structure, the floor is concrete, protected from light, no ventilation equipment, natural ventilation, and oil drums are stored upright.
B. Outdoor group The 3 types of oil products in this group are stored in the open air on the roof balcony, exposed to the atmosphere and directly exposed to the sun. When it rains, the rainwater is directly sprayed on the oil drum, and the conditions are relatively harsh. In order to prevent rainwater from leaking into the oil drums from the joints of the lids, the oil drums of the outdoor group are laid horizontally on the red brick floor. Except for the element content, rotating oxygen bomb, internal combustion engine oil oxidation and friction and wear tests of the two groups of oil products, which are measured every 6 months, the other items are measured every 3 months to observe the quality changes.
Generally speaking, the various indicators of the oil in the 15W/40SF gasoline engine oil chamber group change slowly, and the quality is relatively stable. The analysis results of outdoor group 100e kinematic viscosity, low temperature dynamic viscosity, boundary temperature, flash point, pour point, machine impurities, sulfate ash, element content and other items are similar to the indoor group. However, the following four indicators have changed significantly in 9 months. The anti-foaming property (after 24e) has exceeded the quality standard, respectively 10/0, 30/0, 30/0 (mL/mL), the water content has increased from the original trace to 0.05% (exceeding the standard), although the acid value result is a report However, it increased rapidly from 1.11mgKOH/g to 1.56mgKOH/g. The internal combustion engine oil oxidation test score increased from 1.03 points to 4.41 points.
80W/90GL-5 vehicle gear oil 80W/90GL-5 vehicle gear oil technical standards and new oil quality indicators. a. When the storage period of the indoor group reaches 18 months, the anti-foaming results of the oil are unqualified; the friction and wear test results show a gradual upward trend, and the extreme pressure anti-wear properties become worse; other items are good. b. When the outdoor storage period reaches 9 months, the anti-foam test result exceeds the index requirement. The induction period of the rotating oxygen bomb test is shortened (deteriorated). The friction and wear test results also showed an upward trend, and the extreme pressure and wear resistance became worse. There is no major change in other indicators, and they are still within the range of product indicators.
68HM anti-wear hydraulic oil 68HM anti-wear hydraulic oil technical standards and new oil quality indicators. Automobile technology and materials-28-68HM oil copper sheet corrosion test 68HM oil-air release test 68HM anti-emulsification test 68HM oil corrosion test 68HM oil rotating oxygen bomb test At 18 months, the corrosion and air release test results exceeded the index requirements, and at 24 months, the demulsification analysis results exceeded the standard (4, 5); the neutralization value rose to 0.64mgKOH/g, rotating oxygen bomb The test result also has a big change (deterioration); other items are kept in a qualified state.
b. When the outdoor storage test is carried out for 9 months, the corrosion, rust, air release, and anti-emulsification test results all show an upward trend, exceeding the product quality index requirements (4, 5, 6); the neutralization value is a report However, it also increased to 0.54mgKOH/g; the evaluation result of the rotating oxygen bomb became worse; there was no major change in other items, and the qualified level was maintained.
Conclusion Through the two-year storage test, we have learned such a rule that within a certain time range, some oil indicators are less affected by time factors, and can maintain a stable state regardless of the length of time, such as kinematic viscosity. , Pour point, flash point, etc.; other indicators of oil products are affected by time and environment. Regardless of the storage environment, oil products will change more or less after a certain period of time. Based on the above analysis, the storage period of the indoor and outdoor groups of various oil products can be obtained.
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