摘要
磨损与腐蚀的耦合作用会加剧高端装备关键运动部件的损伤失效,导致其服役寿命大幅缩减.本文中基于铬酸锶(SrCrO_(4))的缓蚀特性及聚四氟乙烯(PTFE)的低表面能和低剪切特性,结合综合性能优异的酚醛环氧树脂制备了兼具良好耐腐蚀和摩擦学性能的铬酸锶/聚四氟乙烯/酚醛环氧(SrCrO_(4)/PTFE/EPN)功能一体化复合涂层.采用摩擦磨损试验、电化学阻抗谱和极化曲线研究了SrCrO_(4)、PTFE及腐蚀摩擦介质对复合涂层的摩擦学性能和抗电化学腐蚀性能的影响,重点研究了SrCrO_(4)在酚醛环氧涂层中的缓蚀防护机理.结果表明:SrCrO_(4)缓蚀作用下基材界面发生化学反应,产生了缓蚀钝化层,能够有效提高涂层的耐腐蚀性能.尤其SrCrO_(4)添加量为树脂质量的4%时,钝化效果最佳,低频阻抗模量值和腐蚀电流密度分别为1.06×10^(11)Ω·cm^(2)和0.28×10^(-10)A/cm^(2);PTFE的引入不仅将涂层由亲水性转变为疏水性,进一步提升了涂层的屏蔽阻隔特性,使涂层被电解质溶液浸入的时间滞后了10倍,而且使涂层的摩擦学性能明显提升,相较酚醛环氧涂层摩擦系数降低约73.90%,耐磨损性能提高3.2倍;在质量分数为3.5%NaCl溶液的腐蚀介质条件下,SrCrO_(4)/PTFE/EPN复合涂层表现出更低的摩擦系数,且能够在摩擦副接触界面形成钝化防护膜,该钝化膜主要以Fe和Cr氧化物、氢氧化物或结晶水化物的形式存在,从而有效抑制对偶面由于腐蚀而产生的磨损.
The coupling effect of wear and corrosion intensifies the damage and failure of key moving parts of high-end equipment,leading to a significant reduction in their service life.It is expected to solve the above problems by introducing the anticorrosive filler and solid lubricant into the polymer binder to prepare the protective coating.However,at present,most researches on organic bonded coatings with corrosion inhibition performance focus on the corrosion resistance of coatings,while the influence of corrosion inhibitors on the tribological properties of coatings is not clear,and organic bonded coatings with corrosion inhibition and excellent tribological properties are rarely reported.At present,among the corrosion inhibitors used for organic coatings,chromate is the most effective and widely used,among which strontium chromate(SrCrO_(4))shows good compatibility,and its solubility is low and there is still enough dissolution to ensure its corrosion inhibition.Based on the corrosion inhibition characteristics of SrCrO_(4) and the low surface energy and low shear characteristics of polytetrafluoroethylene(PTFE),the functional integrated strontium chromate/polytetrafluoroethylene/phenolic epoxy(SrCrO_(4)/PTFE/EPN)coatings with excellent corrosion resistance and tribological properties were prepared.The effects of SrCrO_(4),PTFE and corrosion friction medium on tribological properties and electrochemical corrosion resistance of coatings were investigated by CSM friction and wear testing machine and P4000A electrochemical workstation.In order to focus on the corrosion inhibition and protection mechanism of SrCrO_(4) in phenolic epoxy coating,we firstly introduced SrCrO_(4) into EPN coating,and studied the surface morphology and electrochemical corrosion resistance of the coating.It was found that,especially when the introduction amount of SrCrO_(4) was 4%of the resin mass,the surface of the coating was flat and compact with no obvious pores.SrCrO_(4) introduced can be uniformly embedded into the coating,and fill the
作者
陈明锴
陈磊
马彦军
赵志成
李凤英
张定军
周惠娣
陈建敏
CHEN Mingkai;CHEN Lei;MA Yanjun;ZHAO Zhicheng;LI Fengying;ZHANG Dingjun;ZHOU Huidi;CHEN Jianmin(Department of Materials Science and Engineering,Lanzhou University of Technology,Gansu Lanzhou 730050,China;Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《摩擦学学报（中英文）》
EI
CAS
CSCD
北大核心
2024年第2期129-142,共14页
Tribology
基金
国家重点研发计划项目(2022YFB3809000)
国家自然科学基金项目(52105228,51663013)
国防基础科研计划项目(JCKY2021130B038)资助。
关键词
缓蚀作用
功能一体化
钝化膜
耐腐蚀性能
摩擦学性能
inhibition of corrosion
integration of functions
passivation film
corrosion resistance
tribological properties
