The chemical properties of carbon fiber are known to carbon. In addition to being oxidized by strong oxidants, it is inert to general alkali. When the temperature in the air is higher than 400 ° C, significant oxidation occurs, and CO and CO2 are formed. Carbon fiber has good corrosion resistance to common organic solvents, acids and alkalis, insoluble and non-expanding, and corrosion resistance is outstanding, and there is no problem of rust at all. Some scholars immersed PAN-based carbon fiber in a strong alkali sodium hydroxide solution in 1981. It has been in the form of fiber for more than 30 years. However, its impact resistance is poor, easy to damage, oxidation occurs under the action of strong acid, the electromotive force of carbon fiber is positive, and the electromotive force of aluminum alloy is negative. Metal carbonization, carburization and electrochemical corrosion occur when carbon fiber composites are used in combination with aluminum alloys. Therefore, the carbon fiber must be surface treated before use. Carbon fiber is also resistant to oil, radiation, radiation, toxic gases and decelerating neutrons.