Fluorocarbon coatings have good resistance to weathering and corrosion and have been used as a coating material for relics in China.However,direct coating following industrial procedures can not meet special conservation requirements,such as low gloss and reversibility.Therefore,a series of fluorocarbon coating materials have been tested for conservation of iron relics.Their mechanical and anti corrosion properties,thermal stability and resistance to weathering have been tested.The results showed that using aprimer coating and adding SiO₂ nano particles are effective in protecting outdoor iron relics.This conclusion was verified by observation of the appearance of the object and FTIR spectrum analysis of samples before and after exposure tests.The thermal stability of the fluorocarbon coating can be increased by adding nano SiO₂ particles.