All the oil products subjected to the storage test were filled in tinplate drums with a capacity of 20 L, a diameter of 265 mm, a height of 385 mm, and a wall thickness of 2.2 mm. The entire test was conducted in two groups, indoor and outdoor. a. Indoor group The three types of oil in this group are stored indoors. The building has a frame structure and the floor is a concrete floor. It is protected from light and has no ventilation equipment. The oil drums are stored upright by natural ventilation.
b. Outdoor Group The three types of oils in this group are stored in open air on the balcony of the roof, exposed to the atmosphere and exposed to direct sunlight. When it rains, the rainwater directly showers the oil barrels. The conditions are rather harsh. In order to prevent rainwater from seeping into the barrel from the joints of the lid, the outdoor barrels are placed horizontally on the red brick floor. In addition to elemental content, rotational oxygen bomb, internal combustion engine oil oxidation and friction and wear test, the two groups of oils were measured once every six months, and other items were measured once every three months to observe the quality changes.
In general, the 15W/40SF gasoline engine oils in the indoor group changed slowly and the quality was relatively stable. The analysis results of outdoor group 100e, such as kinematic viscosity, low temperature dynamic viscosity, boundary delivery temperature, flash point, pour point, miscellaneous, sulfated ash, and elemental content, were similar to those of the indoor group. However, the following four indicators have changed significantly at 9 months. The anti-foaming properties (post-24e) have exceeded the quality standards of 10/0, 30/0, and 30/0 (mL/mL) respectively, and the water content has increased from the original trace to 0.05% (exceeding). The acid value result is reported The value, but increased rapidly, increased from 1.11 mg KOH/g to 1.56 mg KOH/g. The engine oil oxidation test score increased from 1.03 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 antifoaming result of the oil is unqualified; the friction and wear test results show a gradual upward trend, and the extreme pressure antiwear property deteriorates; other items are all good. b. When the storage period of the outdoor group reaches 9 months, the anti-foam determination results exceed the requirements of the indicator. The induction period of the rotary oxygen bomb test is shortened (deteriorated). Friction and wear test results also showed an upward trend, and the extreme pressure and wear resistance deteriorated. No major changes have been made to other indicators, and they are still within product specifications.
68HM anti-wear hydraulic oil 68HM anti-wear hydraulic oil technical standards and new oil quality indicators. Automotive Technology and Materials-28-68HM Copper foil corrosion test 68HM oil air release test 68HM emulsion test 68HM oil corrosion test 68HM oil rotary oxygen bomb test Han Shenjun et al.: Inspection of automotive lubricant storage period a. Indoor group storage test At 18 months, corrosion and air release test results exceeded the requirements of the index. When the test was conducted up to 24 months, the results of anti-emulsification analysis exceeded the standards (4, 5); the neutralization value rose to 0.64 mg KOH/g, and the rotating oxygen bombs The test results also have a large change (deterioration); all other items are kept in a qualified state.
b. Outdoor group When the storage test was carried out to 9 months, the corrosion, rust, air release, and anti-emulsification test results showed an upward trend, exceeding the product quality index requirements (4, 5, 6); the neutralization value was reported The value, but also rose to 0.54mgKOH / g; rotating oxygen bomb assessment results deteriorated; no other major changes in other items to maintain the level of compliance.
Conclusion Through a two-year storage test, we learned that such a rule, in a certain time range, some oil indicators are less affected by the time factor, regardless of the length of time, can maintain a stable state, such as kinematic viscosity , pour point, flash point, etc.; some other indicators of oil are affected by time and environment, regardless of the storage environment, after a certain time, the oil will change more or less. Based on the above analysis, the shelf life of indoor and outdoor groups of various oil products can be obtained.
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