| TANG Jia-hang,REN Ye-wei,CUI Li-cong,YU Bing-jun.Ultraviolet/Ozone Assisted the Formation of PDMS Self-assembled Film on Stainless Steel and Its Properties[J],51(12):142-150 |
| Ultraviolet/Ozone Assisted the Formation of PDMS Self-assembled Film on Stainless Steel and Its Properties |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.12.014 |
| KeyWord:ultraviolet/ozone (UV/O3) treatment surface modification polydimethylsiloxane (PDMS) self-assembly materials protection stainless steel |
| Author | Institution |
| TANG Jia-hang |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| REN Ye-wei |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| CUI Li-cong |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| YU Bing-jun |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Stainless steel (SS) is prone to fail in the environment with high concentration of chloride ions, so it is critical to concentrate on its protection technology for improving the applications. Under the premise of not damaging the surface of stainless steel, and further developing the corrosion resistance and wear resistance of 316L stainless steel by self-assembly (SA) technology, we prepared PDMS self-assembled film on the surface of stainless steel with the assistance of UV/O3 pretreatment. Before the film preparation, 316L stainless steel was cut into cylinders of ϕ10 mm×4 mm as the film-forming substrate, and then mechanically polished with sandpaper and diamond abrasion paste for achieving a smooth surface. During the experiment, the stainless steel was first treated with UV/O3 assisted pretreatment to increase its surface activity, and then the polydimethylsiloxane (PDMS) self-assembled film was obtained on the pretreated stainless steel surface by immersion method. Atomic force microscope (AFM), water contact angle tester, electrochemical workstation, X-ray photoelectron spectrometer and other equipment were utilized to analyze the effect of UV/O3 treatment time on the surface of 316L stainless steel and the impact of self-assembly time on corrosion resistance. In addition, hydrochloric acid corrosion experiment simulated the long-term immersion of stainless steel in corrosion solution, which can verify the long-term effectiveness of corrosion resistance of the PDMS self-assembled film. A multifunctional friction and wear testing machine was employed to study the wear resistance of 316L stainless steel. It seems from the experimental results that when the UV/O3 treatment time was 20 min, the surface of 316L stainless steel presented great hydrophilicity, and the roughness was also the lowest at this time. After obtaining PDMS self-assembled film, the corrosion inhibition efficiency of 316L stainless steel was significantly improved, and the highest corrosion inhibition efficiency reached 90.51% when the self-assembly time was 0.5 h. Meanwhile, the self-assembled film formed with UV/O3 pretreatment for 20 min presented higher corrosion inhibition efficiency and higher coverage than the self-assembled film formed without UV/O3 pretreatment. Hydrochloric acid corrosion experimental test showed that the surface of the stainless steel after self-assembly with UV/O3 pretreatment presented excellent performance to resist long-term corrosion. Further friction and wear test results showed that the friction coefficient of 316L stainless steel which obtained the PDMS self-assembled film decreased from 0.85 to 0.25. The surface of the stainless steel after self-assembly without UV/O3 pretreatment began to be worn at 140 s, but the surface of the stainless steel after self-assembly with UV/O3 pretreatment began to wear at 530 s. |
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