| PENG Wenya,LI Gang,CHEN Xiaolong,LI Kui,CHEN Zhilai,WANG Ying,LI Pu.Design, Preparation and Performance of Multilayer Composite Coating Integrating Lubrication and Corrosion Protection[J],53(15):100-108 |
| Design, Preparation and Performance of Multilayer Composite Coating Integrating Lubrication and Corrosion Protection |
| Received:August 15, 2023 Revised:January 10, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.009 |
| KeyWord:phosphate coating high temperature lubrication corrosion protection multilayer composite coating functional integration |
| Author | Institution |
| PENG Wenya |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| LI Gang |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| CHEN Xiaolong |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| LI Kui |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| CHEN Zhilai |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| WANG Ying |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
| LI Pu |
AECC Hunan Aviation Powerplant Research Institute, Hunan Zhuzhou , China |
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| Abstract: |
| The phosphate bonded solid composite coating due to its good high temperature resistance and oxidation resistance is widely used in surface protection technology, especially in the field of high technology in some special environment conditions of aerospace and civil industries under the condition of moving parts. It is urgent and important to prepare phosphate bonded solid composite coating integrating lubrication and corrosion protection functions, but at the same time, the phosphate bonded solid coating technology realizing both lubrication and corrosion protection is rarely reported. The structural characteristics of the inorganic phosphate determine that the inorganic phosphate composite coating generally has poor flexibility and poor corrosion protection performance. However, recent studies have shown that inorganic phosphate coating containing aluminum powder shows excellent corrosion resistance, but it does not have lubrication performance. While, inorganic phosphate coating containing solid lubricant shows excellent lubrication performance, but its corrosion resistance is very poor. To solve the technical problem of both friction and wear performance and corrosion resistance of inorganic phosphate composite coating, a functional integrated material was designed and prepared through the design concept of multilayer composite structure in which sacrificial inorganic aluminum phosphate coating as the bottom layer mainly plays the corrosion protection role, pure phosphate resin as the intermediate layer isolates the shield and improves the interface binding strength and MoS2 base lubrication function coating as the surface layer mainly contributes to lubrication and wear resistance. The basic mechanical properties, tribology and corrosion protection performance of the coating were evaluated by roughness test, marking test, paint film impactor test, friction and wear test and neutral salt spray test, and the microstructure and abrasion morphology of the coating were observed by scanning electron microscope. The test results showed the truth that the overall thickness of the composite coating was about 60 μm, the thickness of the bottom inorganic aluminum coating was about 27-30 μm, the thickness of the surface lubrication coating was about 18-20 μm and the thickness of the transition layer was about 13-15 μm. Good interface interaction was observed between the bottom layer and the base layer and between the bottom layer and the surface layer and the overall interface was well combined and dense, with no interface stratification and rupture. The high temperature friction wear test showed the truth that with the increase of the test ambient temperature, the friction coefficient and wear rate increased, but the increase was not significant. The average friction coefficient at the room temperature to 600 ℃ was below 0.2, and the wear rate was below 10−5 mm3/(N.m). Evaluation of central salt spray test was carried out according to GB/T 10125 standard, the composite coating surface after 500 hours of neutral salt spray test did not have bubbles, and the multilayer composite coating had good corrosion resistance. Through the ingenious design of multilayer composite structure coating, the construction of composite coating has integrated lubrication and corrosion protection function in the same type of coating. It shows that the multilayer composite coating has excellent lubrication performance and wear resistance as well as good corrosion resistance at the room temperature to 600 ℃. |
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