For fasteners, corrosion causes rust on the threads, reduces their strength and making their disassemblydifficult. The protective coating of fasteners needs to have excellent anti-corrosion and lubricatingproperties. In this paper, nano Aluminium (nano-Al) and Polytetrafluoroethylene (PTFE) particles wereused to fabricate a nano Al-PTFE epoxy self-stratifying structure coating. The SEM, AFM, and DSCresults show that the coating formed a self-stratifying structure when it is pre-dried at 110°C and thendried at 200°C. PTFE is located on the surface of the coating to enhance lubricity, while nano-Al islocated at the bottom of the coating to enhance corrosion resistance. Moreover, Electrochemicalimpedance spectroscopy (EIS) shows that the Cdl of the nano Al-PTFE modified coating with an artificialdefect is lower, while its Rct is higher than that of the other two coatings, indicating that corrosiveelectrochemical activity only occurred in a small area of the coating. The SVET results indicate that thedistance of the nano Al-PTFE modified coating from the defect edge contour only changed a little after48 h of immersion. In conclusion, the coating has good anti-corrosion performance..
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