紧固件Al涂料改性设计与部分性能研究

Modification Design and Partial Performance of Al Coatings for Fasteners

摘要:

航空领域TC4钛合金紧固件通常使用酚醛树脂Al涂层，该涂层存在表面较粗糙、复杂受力下易脱落、耐盐雾寿命低等缺点，因此针对传统TC4紧固件表面Al涂层进行改性。研究了PTFE掺杂量（质量分数）分别为1%、2%和3%时，其对传统Al涂层宏微观形貌、机械及耐环境性能的影响规律。结果表明，掺杂2%的PTFE时Al涂层的耐划伤与抗盐雾能力强，综合性能佳。因此，采用质量分数为2%的纳米PTFE作为改性剂效果更为良好，在飞机钛合金紧固件、钛合金蒙皮、钛合金转轴等方面的腐蚀防护应用具有一定前景。

Abstract:

Phenolic resin Al coating is usually used for TC4 titanium alloy fasteners in the aviation field， which has the disadvantages of rough surface， easy to fall off under complex forces， and low salt spray resistance life. In this study， the Al coatings on the surface of traditional TC4 fasteners were modified. The effects of 1wt.%， 2wt.%， and 3wt.% PTFE doping content on the macro- and micro-morphology， mechanical and environmental resistance properties of traditional Al coatings were studied. The results show that the coating doped with 2wt.% PTFE has strong scratch resistance and salt spray resistance， and the best comprehensive performance. Therefore， using 2wt.% nano-PTFE as a modifier has a better effect， and has a good prospect for corrosion protection applications in titanium alloy fasteners， titanium alloy skins， and titanium alloy rotating shafts of aircraft.