紫外/臭氧辅助不锈钢表面聚二甲基硅氧烷自组装膜的形成及其性能研究  

Ultraviolet/Ozone Assisted the Formation of PDMS Self-assembled Film on Stainless Steel and Its Properties

作　　者：唐嘉杭 任晔炜 崔立聪 余丙军 TANG Jia-hang;REN Ye-wei;CUI Li-cong;YU Bing-jun(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《表面技术》2022年第12期142-150,共9页Surface Technology

摘　　要：目的在不破坏不锈钢表面的前提下,使用自组装技术提升不锈钢表面的耐腐蚀性能和抗磨损性能。方法首先采用紫外/臭氧(UV/O_(3))辅助处理的方法活化316L不锈钢表面,然后利用浸泡法在其表面制备聚二甲基硅氧烷(PDMS)自组装膜。通过原子力显微镜(AFM)、接触角测量仪、电化学工作站、摩擦磨损试验机等设备分析了UV/O_(3)处理时间对316L不锈钢表面的影响以及自组装时间对316L不锈钢表面耐腐蚀、抗磨损性能的影响。结果UV/O_(3)处理时间为20 min时,316L不锈钢表面具有良好的亲水性,且此时粗糙度最低。316L不锈钢表面在形成PDMS自组装膜之后缓蚀效率大幅度提升,且缓蚀效率在自组装时间为0.5 h时最佳,达到90.51%。同时,在经过20 min UV/O_(3)辅助处理后的不锈钢上制备的自组装膜相较于未经UV/O_(3)辅助处理得到的自组装膜,覆盖率更大,缓蚀效率更高。进一步的摩擦磨损试验结果表明,经过UV/O_(3)辅助处理后形成PDMS自组装膜的316L不锈钢表面,摩擦因数从0.85降低到0.25。相较于直接自组装的不锈钢表面在140 s后发生磨损,经过UV/O_(3)预处理后再自组装的不锈钢表面在530 s后才发生磨损。结论UV/O_(3)辅助处理能够在不损伤不锈钢表面的前提下,通过活化不锈钢表面以提高其膜基结合强度,从而提升不锈钢表面自组装成膜的效果。316L不锈钢表面经过UV/O_(3)预处理20 min后在25℃下自组装0.5 h,可以成功得到耐腐蚀性能和抗磨损性能良好的PDMS自组装膜,这一方法有效降低了不锈钢在高浓度氯离子环境中的失效风险,同时也提高了不锈钢表面的耐磨性能。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/O_(3) pretreatment.Before the film preparation,316L stainless steel was cut into cylinders ofϕ10 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/O_(3) 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/O_(3) 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/O_(3) 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 w

关 键 词：紫外/臭氧(UV/O_(3))处理 表面改性 聚二甲基硅氧烷(PDMS) 自组装 材料防护 不锈钢 

分 类 号：TG172[金属学及工艺—金属表面处理] TH117[金属学及工艺—金属学]