海水环境中环氧值对环氧树脂涂层摩擦学性能的影响研究

环氧树脂是一类具有优异的粘接、耐腐蚀和电气绝缘等性能的高强度热固性高分子材料,在黏结剂、防腐涂料和复合材料方面展现出广阔的应用前景,其摩擦学行为与环氧值密切相关.本研究中采用线棒涂布器在铸铁表面分别制备了3种具有不同环氧值的环氧树脂涂层.借助傅里叶红外光谱仪(FT-IR)、X射线光电子能谱仪(XPS)、扫描电镜(SEM)、纳米压痕仪、热重/差热综合热分析仪(TG/DTA)、UMT-3摩擦磨损试验机和表面轮廓仪研究了涂层的结构、硬度、耐热性及摩擦学性能.研究结果表明:涂层在干燥条件和海水环境中的摩擦系数和磨损率均随环氧值的增大而升高;海水环境中涂层的摩擦系数和磨损率均较干燥条件下低.涂层的磨损机理在干燥条件下包括了疲劳磨损、黏着磨损和磨粒磨损,而在海水中仅为疲劳磨损.本研究成果为高性能防腐耐磨涂层的设计与应用提供理论指导.

Influence of Epoxy Value on the Tribological Performances of Epoxy Resin Coatings in Seawater Environment

Epoxy resin is a kind of thermosetting polymer material with good adhesion, corrosion resistance, electrical insulation, high strength and other performances. It has great and potential application in the production of binder, anticorrosive paint and composite materials. However, the tribological behavior of epoxy resin is closely related to the epoxy value. Three kinds of epoxy resin coatings with different epoxy values were prepared on cast iron surface with a bar coater. The construction, hardness, thermostability and tribological performance of the coatings were investigated with the help of Fourier Transform Infrared Spectrometer, X-ray Photoelectron Spectrometer, Scanning Electron Microscopy, Nanoindentor, Thermogravimetry/Differential Thermal Thermogravimetric Analyzer, UMT-3 tribology tester and surface profiler. The results indicate that there was an increase for the friction coefficient and wear rate with the increase of epoxy value both in dry condition and seawater. The friction coefficient and wear rate of the coatings were lower in seawater than that in dry condition. The wear mechanisms of the coatings included fatigue wear, adhesive wear and abrasive wear in dry condition and fatigue wear in seawater. This work provides theoretical guidance for the design and application of high-performances coating with excellent anticorrosion and wear resistance behaviors.