| ZHANG Ji-ping,WANG Peng,HAO Li-feng,DAI Yuan-jing,LI Xiao-lei.The Study of the Anti-micro-pitting Performance of the EP&AW Additives[J],49(9):45-52 |
| The Study of the Anti-micro-pitting Performance of the EP&AW Additives |
| Received:July 13, 2020 Revised:September 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.09.004 |
| KeyWord:EP&AW additive containing phosphorus anti-micro-pitting anti-wear & anti-friction oil film thickness friction oxidation anti-corrosion |
| Author | Institution |
| ZHANG Ji-ping |
1.Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin , China |
| WANG Peng |
2.PetroChina Lanzhou Lubricating Oil R&D Institute, Lanzhou , China |
| HAO Li-feng |
3.Qiuzhen College, Huzhou University, Huzhou , China |
| DAI Yuan-jing |
4.Tsinghua University, Beijing , China |
| LI Xiao-lei |
1.Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin , China |
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| Abstract: |
| To evaluate the anti-micro-pitting performances of three extreme pressure & antiwear (EP&AW) additives containing phosphorus, MPR tests which can simulate the micro-pitting conditions were conducted. Meanwhile, four-ball tribometer, copper corrosion tester, baking oven and lubricating film thickness meter were used to study the other performances of tribology, anti-corrosion, antioxidant and lubricating film. Moreover, mechanism of anti-micro-pitting was investigated in detail. The oil with dispersed phosphorus and nitrogen EP&AW additive can show the best overall performance. After 9 hours MPR test of the oil added with dispersed phosphorus and nitrogen EP&AW additive, change rate of MPR roll track width is 35.87%. With four-ball tribometer test of this oil, maximum non-seizure load of 1441.6 N is obtained, and its relevant wear diameter of ball is 0.38 mm. When test load of four-ball test is bigger than 294 N, friction coefficient of the oil with dispersed phosphorus and nitrogen EP&AW additive is the smallest. Moreover, anticorrosion and antioxidant performance of this oil is good, copper corrosion grade is 1b, and steel disc grade is 1 score with no oil sludge. The oil with dispersed phosphorus and nitrogen EP&AW additive can form lubricating film with thickness of 371.2~153.6 nm when temperature is 60~120 ℃. The dispersed phosphorus and nitrogen EP&AW additive possesses moderate chemical activity and shows the best overall performances. |
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