聚酰胺酰亚胺/聚四氟乙烯复合涂层的制备及其摩擦学性能和耐腐蚀性能

制备了具有良好摩擦学性能和优异耐腐蚀性能的聚酰胺酰亚胺/聚四氟乙烯(PAI/PTFE)多功能复合涂层. 采用CSM摩擦磨损试验机评估了涂层的摩擦学性能，采用P4000A电化学工作站研究了PAI/PTFE复合涂层在质量分数为3.5% NaCl溶液中的抗电化学腐蚀性能. 重点研究了PTFE与PAI的固体质量比对涂层摩擦学性能和耐腐蚀性能的影响. 结果表明:适量PTFE的引入极大增强了PAI涂层的摩擦学性能和耐腐蚀性能. 特别是，当PTFE与PAI的固体质量比为0.6时，涂层的摩擦学性能最佳，摩擦系数为0.075，磨损率为3.72×10-6 mm3/(N·m). 当PTFE与PAI的固体质量比为1时，复合涂层在质量分数为3.5%的NaCl溶液中浸泡240 h后涂层的低频阻抗值∣Z∣_{0.01 Hz}高达3.83×109 Ω?cm2，仍表现出较好的耐腐蚀性能. 此外，经过240 h中性盐雾试验，复合涂层表面没有出现起泡、生锈等现象. 复合涂层具有如此优异的摩擦学性能和耐腐蚀性能归因于PTFE优异的润滑性能以及涂层对腐蚀介质阻隔性能的增强. 

Preparation of Polyamideimide/Polytetrafluoroethylene Composite Coatings and Its Tribological and Anti-Corrosion Properties

Polyamideimide/polytetrafluoroethylene (PAI/PTFE) multifunctional composite coatings with good tribological properties and excellent corrosion resistance were prepared. The CSM friction and wear tester was used to study the tribological performances of the coatings, and the P4000A electrochemical workstation was used to measure the electrochemical corrosion resistance of the PAI/PTFE composite coatings in 3.5% NaCl solution. The focus was on the influence of the solid mass ratio of PTFE to PAI on the tribological properties and corrosion resistance of the coatings. The results showed that the introduction of an appropriate amount of PTFE greatly enhanced the tribological properties and corrosion resistance of the PAI coatings. In particular, when the solid mass ratio of PTFE to PAI was 0.6, the coating exhibited the best tribological performances, as friction coefficient of 0.075 and wear rate of 3.72×10?6 mm3/(N·m). When the solid mass ratio of PTFE to PAI was 1, the low-frequency impedance value of the composite coatings immersed in 3.5% NaCl solution for 240 h was as high as 3.83×109 Ω?cm2 showing excellent corrosion resistance. In addition, there were no blistering and rusting on the surface of the composite coatings exposed to salt spray test for 240 h. Such excellent tribological performances and corrosion resistance of PAI/PTFE composite coatings were attributed to the excellent lubricating properties of PTFE and the enhancement of the barrier properties of the coating to corrosive media.